Articles | Volume 13, issue 6
https://doi.org/10.5194/os-13-889-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Special issue:
https://doi.org/10.5194/os-13-889-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Hydrography and circulation west of Sardinia in June 2014
Michaela Knoll
CORRESPONDING AUTHOR
Wehrtechnische Dienststelle für Schiffe und Marinewaffen, Maritime
Technologie und Forschung (WTD71),Berliner Straße 115, 24340
Eckernförde, Germany
Ines Borrione
NATO Science and Technology Organization, Centre for Maritime Research
and Experimentation (CMRE),
Viale San Bartolomeo 400, 19126 La Spezia, Italy
Heinz-Volker Fiekas
Wehrtechnische Dienststelle für Schiffe und Marinewaffen, Maritime
Technologie und Forschung (WTD71),Berliner Straße 115, 24340
Eckernförde, Germany
Andreas Funk
Wehrtechnische Dienststelle für Schiffe und Marinewaffen, Maritime
Technologie und Forschung (WTD71),Berliner Straße 115, 24340
Eckernförde, Germany
Michael P. Hemming
Centre for Ocean and Atmospheric Sciences (COAS), School of
Environmental Sciences, University of East Anglia
(UEA), Norwich Research
Park, Norwich, NR4 7TJ, UK
Laboratoire d'Océanographie et du Climat, 4 Place Jussieu, 75005 Paris,
France
Jan Kaiser
Centre for Ocean and Atmospheric Sciences (COAS), School of
Environmental Sciences, University of East Anglia
(UEA), Norwich Research
Park, Norwich, NR4 7TJ, UK
Reiner Onken
Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal
Research (HZG), Max-Planck-Straße 1, 21502 Geesthacht, Germany
Bastien Queste
Centre for Ocean and Atmospheric Sciences (COAS), School of
Environmental Sciences, University of East Anglia
(UEA), Norwich Research
Park, Norwich, NR4 7TJ, UK
Aniello Russo
NATO Science and Technology Organization, Centre for Maritime Research
and Experimentation (CMRE),
Viale San Bartolomeo 400, 19126 La Spezia, Italy
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Michael P. Hemming, Jan Kaiser, Jacqueline Boutin, Liliane Merlivat, Karen J. Heywood, Dorothee C. E. Bakker, Gareth A. Lee, Marcos Cobas García, David Antoine, and Kiminori Shitashima
Ocean Sci., 18, 1245–1262, https://doi.org/10.5194/os-18-1245-2022, https://doi.org/10.5194/os-18-1245-2022, 2022
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The Cryosphere, 16, 3005–3019, https://doi.org/10.5194/tc-16-3005-2022, https://doi.org/10.5194/tc-16-3005-2022, 2022
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Geosci. Model Dev., 15, 5807–5828, https://doi.org/10.5194/gmd-15-5807-2022, https://doi.org/10.5194/gmd-15-5807-2022, 2022
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Ocean Sci. Discuss., https://doi.org/10.5194/os-2021-86, https://doi.org/10.5194/os-2021-86, 2021
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Atmos. Chem. Phys., 21, 6857–6873, https://doi.org/10.5194/acp-21-6857-2021, https://doi.org/10.5194/acp-21-6857-2021, 2021
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Ocean Sci., 17, 593–614, https://doi.org/10.5194/os-17-593-2021, https://doi.org/10.5194/os-17-593-2021, 2021
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A Seaglider was deployed for 8 months in the Norwegian Sea mounting an oxygen and, for the first time, a CO2 optode and a chlorophyll fluorescence sensor. The oxygen and CO2 data were used to assess the spatial and temporal variability and calculate the net community production, N(O2) and N(CT). The dataset was used to calculate net community production from inventory changes, air–sea flux, diapycnal mixing and entrainment.
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Atmos. Meas. Tech., 14, 1833–1849, https://doi.org/10.5194/amt-14-1833-2021, https://doi.org/10.5194/amt-14-1833-2021, 2021
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We describe the Roland von Glasow Air-Sea-Ice Chamber, a laboratory facility for studying ocean–sea-ice–atmosphere interactions. We characterise the technical capabilities of our facility to help future users plan and perform experiments. We also characterise the sea ice grown in the facility, showing that the extinction of photosynthetically active radiation, the bulk salinity, and the growth rate of our artificial sea ice are within the range of natural values.
Reiner Onken, Burkard Baschek, and Ingrid M. Angel-Benavides
Ocean Sci., 16, 657–684, https://doi.org/10.5194/os-16-657-2020, https://doi.org/10.5194/os-16-657-2020, 2020
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In order to provide an aid for the interpretation of observations of
the formation, structure, and dynamics of submesoscale
patterns, a numerical model is applied in a double-offline-nested
setup to a sub-area of the Baltic Sea. A model with 500 m horizontal
resolution is nested into an existing operational model in order to
create a realistic mesoscale environment. Turbulent patterns with
horizontal scales < 1 km are resolved by a second nest with 100 m resolution.
Venugopal Thushara, Puthenveettil Narayana Menon Vinayachandran, Adrian J. Matthews, Benjamin G. M. Webber, and Bastien Y. Queste
Biogeosciences, 16, 1447–1468, https://doi.org/10.5194/bg-16-1447-2019, https://doi.org/10.5194/bg-16-1447-2019, 2019
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Chlorophyll distribution in the ocean remains to be explored in detail, despite its climatic significance. Here, we document the vertical structure of chlorophyll in the Bay of Bengal using observations and a model. The shape of chlorophyll profiles, characterized by prominent deep chlorophyll maxima, varies in dynamically different regions, controlled by the monsoonal forcings. The present study provides new insights into the vertical distribution of chlorophyll, rarely observed by satellites.
Reiner Onken, Heinz-Volker Fiekas, Laurent Beguery, Ines Borrione, Andreas Funk, Michael Hemming, Jaime Hernandez-Lasheras, Karen J. Heywood, Jan Kaiser, Michaela Knoll, Baptiste Mourre, Paolo Oddo, Pierre-Marie Poulain, Bastien Y. Queste, Aniello Russo, Kiminori Shitashima, Martin Siderius, and Elizabeth Thorp Küsel
Ocean Sci., 14, 321–335, https://doi.org/10.5194/os-14-321-2018, https://doi.org/10.5194/os-14-321-2018, 2018
Short summary
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In June 2014, high-resolution oceanographic data were collected in the
western Mediterranean Sea by two research vessels, 11 gliders, moored
instruments, drifters, and one profiling float. The objective
of this article is to provide an overview of the data set which
is utilised by various ongoing studies, focusing on (i) water masses and circulation, (ii) operational forecasting, (iii) data assimilation, (iv) variability of the ocean, and (v) new payloads
for gliders.
Peter M. F. Sheehan, Barbara Berx, Alejandro Gallego, Rob A. Hall, Karen J. Heywood, Sarah L. Hughes, and Bastien Y. Queste
Ocean Sci., 14, 225–236, https://doi.org/10.5194/os-14-225-2018, https://doi.org/10.5194/os-14-225-2018, 2018
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We calculate tidal velocities using observations of ocean currents collected by an underwater glider. We use these velocities to investigate the location of sharp boundaries between water masses in shallow seas. Narrow currents along these boundaries are important transport pathways around shallow seas for pollutants and organisms. Tides are an important control on boundary location in summer, but seawater salt concentration can also influence boundary location, especially in winter.
Chris J. Curtis, Jan Kaiser, Alina Marca, N. John Anderson, Gavin Simpson, Vivienne Jones, and Erika Whiteford
Biogeosciences, 15, 529–550, https://doi.org/10.5194/bg-15-529-2018, https://doi.org/10.5194/bg-15-529-2018, 2018
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Few studies have investigated the atmospheric deposition of nitrate in the Arctic or its impacts on Arctic ecosystems. We collected late-season snowpack from three regions in western Greenland from the coast to the edge of the ice sheet. We found major differences in nitrate concentrations (lower at the coast) and deposition load (higher). Nitrate in snowpack undergoes losses and isotopic enrichment which are greatest in inland areas; hence deposition impacts may be greatest at the coast.
Reiner Onken
Ocean Sci., 13, 925–945, https://doi.org/10.5194/os-13-925-2017, https://doi.org/10.5194/os-13-925-2017, 2017
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An ocean prediction model was driven by observations via
assimilation. The best forecast was obtained using a smoothing scale
of 12.5 km and a time window of 24 h for data selection. Mostly,
the forecasts were better than that of a run without assimilation, the
skill score increased with increasing forecast range, and the score
for temperature was higher than the score for salinity. It is shown
that a vast number of data can be managed by the applied method
without data reduction.
Michael P. Hemming, Jan Kaiser, Karen J. Heywood, Dorothee C.E. Bakker, Jacqueline Boutin, Kiminori Shitashima, Gareth Lee, Oliver Legge, and Reiner Onken
Ocean Sci., 13, 427–442, https://doi.org/10.5194/os-13-427-2017, https://doi.org/10.5194/os-13-427-2017, 2017
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Underwater gliders are useful platforms for monitoring the world oceans at a high resolution. An experimental pH sensor was attached to an underwater glider in the Mediterranean Sea, which is an important carbon sink region. Comparing measurements from the glider with those obtained from a ship indicated that there were issues with the experimental pH sensor. Correcting for these issues enabled us to look at pH variability in the area related to biomass abundance and physical water properties.
Markella Prokopiou, Patricia Martinerie, Célia J. Sapart, Emmanuel Witrant, Guillaume Monteil, Kentaro Ishijima, Sophie Bernard, Jan Kaiser, Ingeborg Levin, Thomas Blunier, David Etheridge, Ed Dlugokencky, Roderik S. W. van de Wal, and Thomas Röckmann
Atmos. Chem. Phys., 17, 4539–4564, https://doi.org/10.5194/acp-17-4539-2017, https://doi.org/10.5194/acp-17-4539-2017, 2017
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Nitrous oxide is the third most important anthropogenic greenhouse gas with an increasing mole fraction. To understand its natural and anthropogenic sources
we employ isotope measurements. Results show that while the N2O mole fraction increases, its heavy isotope content decreases. The isotopic changes observed underline the dominance of agricultural emissions especially at the early part of the record, whereas in the later decades the contribution from other anthropogenic sources increases.
Reiner Onken
Ocean Sci., 13, 235–257, https://doi.org/10.5194/os-13-235-2017, https://doi.org/10.5194/os-13-235-2017, 2017
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A numerical ocean circulation model has been employed to explore the
sensitivity of the forecast skill of mixed-layer properties to the
initial conditions, boundary conditions, and vertical mixing
parameterisations. All forecasts were validated against observations
which were taken in June 2014 to the west of Sardinia.
Imke Grefe, Sophie Fielding, Karen J. Heywood, and Jan Kaiser
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-73, https://doi.org/10.5194/bg-2017-73, 2017
Revised manuscript not accepted
Paolo Oddo, Andrea Storto, Srdjan Dobricic, Aniello Russo, Craig Lewis, Reiner Onken, and Emanuel Coelho
Ocean Sci., 12, 1137–1153, https://doi.org/10.5194/os-12-1137-2016, https://doi.org/10.5194/os-12-1137-2016, 2016
Bastien Y. Queste, Liam Fernand, Timothy D. Jickells, Karen J. Heywood, and Andrew J. Hind
Biogeosciences, 13, 1209–1222, https://doi.org/10.5194/bg-13-1209-2016, https://doi.org/10.5194/bg-13-1209-2016, 2016
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In stratified shelf seas, physical and biological conditions can lead to seasonal oxygen depletion when consumption exceeds supply. An ocean glider obtained a high-resolution 3-day data set of biochemical and physical properties in the central North Sea. The data revealed very high oxygen consumption rates, far exceeding previously reported rates. A consumption–supply oxygen budget indicates a localized or short-lived resuspension event causing rapid remineralization of benthic organic matter.
Dominika Lewicka-Szczebak, Jens Dyckmans, Jan Kaiser, Alina Marca, Jürgen Augustin, and Reinhard Well
Biogeosciences, 13, 1129–1144, https://doi.org/10.5194/bg-13-1129-2016, https://doi.org/10.5194/bg-13-1129-2016, 2016
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Oxygen isotopic signatures of N2O are formed in complex multistep enzymatic reactions and depend on isotopic fractionation during enzymatic reduction of nitrate to N2O and on the oxygen isotope exchange with soil water. We propose a new method for quantification of oxygen isotope exchange, with simultaneous determination of oxygen isotopic signatures, to decipher the mechanism of oxygen isotopic fractionation. We indicate the differences between fractionation mechanisms by various pathways.
Tom Hull, Naomi Greenwood, Jan Kaiser, and Martin Johnson
Biogeosciences, 13, 943–959, https://doi.org/10.5194/bg-13-943-2016, https://doi.org/10.5194/bg-13-943-2016, 2016
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We explore the estimation of NCP using an oxygen time series from a surface mooring located in the River Thames plume. Our study site is identified as a region of net heterotrophy with strong seasonal variability. Short-term daily variability in oxygen and horizontal advection is demonstrated to make accurate estimates challenging. The effects of bubble-induced supersaturation is shown to have a large influence on cumulative annual estimates.
S. Walter, A. Kock, T. Steinhoff, B. Fiedler, P. Fietzek, J. Kaiser, M. Krol, M. E. Popa, Q. Chen, T. Tanhua, and T. Röckmann
Biogeosciences, 13, 323–340, https://doi.org/10.5194/bg-13-323-2016, https://doi.org/10.5194/bg-13-323-2016, 2016
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Oceans are a source of H2, an indirect greenhouse gas. Measurements constraining the temporal and spatial patterns of oceanic H2 emissions are sparse and although H2 is assumed to be produced mainly biologically, direct evidence for biogenic marine production was lacking. By analyzing the H2 isotopic composition (δD) we were able to constrain the global H2 budget in more detail, verify biogenic production and point to additional sources. We also showed that current models are reasonably working.
J. Gloël, C. Robinson, G. H. Tilstone, G. Tarran, and J. Kaiser
Ocean Sci., 11, 947–952, https://doi.org/10.5194/os-11-947-2015, https://doi.org/10.5194/os-11-947-2015, 2015
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We assess benzalkonium chloride (BAC) as alternative to mercuric chloride (HgCl2) for preservation of seawater samples. BAC concentrations of 50mg dm–3 inhibited microbial activity for at least 3 days in samples tested with chlorophyll a concentrations up to 1mg m–3. With fewer risks to health and environment, and lower waste disposal costs, BAC could be a short-term alternative to HgCl2, but cannot replace it for oxygen triple isotope samples, which require storage over weeks to months.
V. E. Brando, F. Braga, L. Zaggia, C. Giardino, M. Bresciani, E. Matta, D. Bellafiore, C. Ferrarin, F. Maicu, A. Benetazzo, D. Bonaldo, F. M. Falcieri, A. Coluccelli, A. Russo, and S. Carniel
Ocean Sci., 11, 909–920, https://doi.org/10.5194/os-11-909-2015, https://doi.org/10.5194/os-11-909-2015, 2015
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Sea surface temperature and turbidity, derived from satellite imagery, were used to characterize river plumes in the northern Adriatic Sea during a significant flood event in November 2014. Circulation patterns and sea surface salinity, from an operational coupled ocean-wave model, supported the interpretation of the plumes' interaction with the receiving waters and among them.
K. Ishijima, M. Takigawa, K. Sudo, S. Toyoda, N. Yoshida, T. Röckmann, J. Kaiser, S. Aoki, S. Morimoto, S. Sugawara, and T. Nakazawa
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acpd-15-19947-2015, https://doi.org/10.5194/acpd-15-19947-2015, 2015
Revised manuscript not accepted
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We developed an atmospheric N2O isotopocule model based on a chemistry-coupled atmospheric general circulation model and a simple method to optimize the model, and estimated the isotopic signatures of surface sources at the hemispheric scale. Data obtained from ground-based observations, measurements of firn air, and balloon and aircraft flights were used to optimize the long-term trends, interhemispheric gradients, and photolytic fractionation, respectively, in the model.
S. J. Allin, J. C. Laube, E. Witrant, J. Kaiser, E. McKenna, P. Dennis, R. Mulvaney, E. Capron, P. Martinerie, T. Röckmann, T. Blunier, J. Schwander, P. J. Fraser, R. L. Langenfelds, and W. T. Sturges
Atmos. Chem. Phys., 15, 6867–6877, https://doi.org/10.5194/acp-15-6867-2015, https://doi.org/10.5194/acp-15-6867-2015, 2015
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Stratospheric ozone protects life on Earth from harmful UV-B radiation. Chlorofluorocarbons (CFCs) are man-made compounds which act to destroy this barrier.
This paper presents (1) the first measurements of the stratospheric δ(37Cl) of CFCs -11 and -113; (2) the first quantification of long-term trends in the tropospheric δ(37Cl) of CFCs -11, -12 and -113.
This study provides a better understanding of source and sink processes associated with these destructive compounds.
D. J. Mrozek, C. van der Veen, M. Kliphuis, J. Kaiser, A. A. Wiegel, and T. Röckmann
Atmos. Meas. Tech., 8, 811–822, https://doi.org/10.5194/amt-8-811-2015, https://doi.org/10.5194/amt-8-811-2015, 2015
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Our analytical system is a promising tool for investigating the triple oxygen isotope composition of CO2 from stratospheric air samples of volumes 100ml and smaller. The method is designed for measuring air samples with CO2 mole fractions between 360 and 400ppm, and it is the first fully automated analytical system that uses CeO2 as the isotope exchange medium.
I. Grefe and J. Kaiser
Ocean Sci., 10, 501–512, https://doi.org/10.5194/os-10-501-2014, https://doi.org/10.5194/os-10-501-2014, 2014
I. Borrione, O. Aumont, M. C. Nielsdóttir, and R. Schlitzer
Biogeosciences, 11, 1981–2001, https://doi.org/10.5194/bg-11-1981-2014, https://doi.org/10.5194/bg-11-1981-2014, 2014
V. V. Petrenko, P. Martinerie, P. Novelli, D. M. Etheridge, I. Levin, Z. Wang, T. Blunier, J. Chappellaz, J. Kaiser, P. Lang, L. P. Steele, S. Hammer, J. Mak, R. L. Langenfelds, J. Schwander, J. P. Severinghaus, E. Witrant, G. Petron, M. O. Battle, G. Forster, W. T. Sturges, J.-F. Lamarque, K. Steffen, and J. W. C. White
Atmos. Chem. Phys., 13, 7567–7585, https://doi.org/10.5194/acp-13-7567-2013, https://doi.org/10.5194/acp-13-7567-2013, 2013
H. Mihanović, I. Vilibić, S. Carniel, M. Tudor, A. Russo, A. Bergamasco, N. Bubić, Z. Ljubešić, D. Viličić, A. Boldrin, V. Malačič, M. Celio, C. Comici, and F. Raicich
Ocean Sci., 9, 561–572, https://doi.org/10.5194/os-9-561-2013, https://doi.org/10.5194/os-9-561-2013, 2013
K. Castro-Morales, N. Cassar, D. R. Shoosmith, and J. Kaiser
Biogeosciences, 10, 2273–2291, https://doi.org/10.5194/bg-10-2273-2013, https://doi.org/10.5194/bg-10-2273-2013, 2013
I. Borrione and R. Schlitzer
Biogeosciences, 10, 217–231, https://doi.org/10.5194/bg-10-217-2013, https://doi.org/10.5194/bg-10-217-2013, 2013
Related subject area
Approach: In situ Observations | Depth range: All Depths | Geographical range: Mediterranean Sea | Phenomena: Temperature, Salinity and Density Fields
High-resolution observations in the western Mediterranean Sea: the REP14-MED experiment
The Mediterranean outflow in the Strait of Gibraltar and its connection with upstream conditions in the Alborán Sea
Thermohaline properties in the Eastern Mediterranean in the last three decades: is the basin returning to the pre-EMT situation?
Qualified temperature, salinity and dissolved oxygen climatologies in a changing Adriatic Sea
Hydrographic situation during cruise M84/3 and P414 (spring 2011) in the Mediterranean Sea
The Mediterranean Sea system: a review and an introduction to the special issue
Long-term monitoring programme of the hydrological variability in the Mediterranean Sea: a first overview of the HYDROCHANGES network
About the seasonal and fortnightly variabilities of the Mediterranean outflow
Importance of the variability of hydrographic preconditioning for deep convection in the Gulf of Lion, NW Mediterranean
Reiner Onken, Heinz-Volker Fiekas, Laurent Beguery, Ines Borrione, Andreas Funk, Michael Hemming, Jaime Hernandez-Lasheras, Karen J. Heywood, Jan Kaiser, Michaela Knoll, Baptiste Mourre, Paolo Oddo, Pierre-Marie Poulain, Bastien Y. Queste, Aniello Russo, Kiminori Shitashima, Martin Siderius, and Elizabeth Thorp Küsel
Ocean Sci., 14, 321–335, https://doi.org/10.5194/os-14-321-2018, https://doi.org/10.5194/os-14-321-2018, 2018
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In June 2014, high-resolution oceanographic data were collected in the
western Mediterranean Sea by two research vessels, 11 gliders, moored
instruments, drifters, and one profiling float. The objective
of this article is to provide an overview of the data set which
is utilised by various ongoing studies, focusing on (i) water masses and circulation, (ii) operational forecasting, (iii) data assimilation, (iv) variability of the ocean, and (v) new payloads
for gliders.
Jesús García-Lafuente, Cristina Naranjo, Simone Sammartino, José C. Sánchez-Garrido, and Javier Delgado
Ocean Sci., 13, 195–207, https://doi.org/10.5194/os-13-195-2017, https://doi.org/10.5194/os-13-195-2017, 2017
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This study shows the influence of the Western Alboran circulation on the composition of the outflow through the Strait of Gibraltar, which is mainly composed by intermediate and Deep Mediterranean Water. While the effect of the gyre in the deep water proportion was already reported, the effect on the intermediate flow has not been addressed yet. The size of the gyre was compared with the characteristic of the outflow in the strait. Results show the intermediate flow benefits from a weak gyre.
V. Cardin, G. Civitarese, D. Hainbucher, M. Bensi, and A. Rubino
Ocean Sci., 11, 53–66, https://doi.org/10.5194/os-11-53-2015, https://doi.org/10.5194/os-11-53-2015, 2015
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The results of this study reveal that the thermohaline properties in the study area in 2011 lie between the thermohaline characteristics of the EMT and those of the pre-EMT phase, indicating a possible slow return towards the latter. It highlights the relationship between the hydrological property distribution of the upper layer in the Levantine basin and the alternate circulation regimes in the Ionian, which modulates the salinity distribution in the Eastern Mediterranean Sea.
M. Lipizer, E. Partescano, A. Rabitti, A. Giorgetti, and A. Crise
Ocean Sci., 10, 771–797, https://doi.org/10.5194/os-10-771-2014, https://doi.org/10.5194/os-10-771-2014, 2014
D. Hainbucher, A. Rubino, V. Cardin, T. Tanhua, K. Schroeder, and M. Bensi
Ocean Sci., 10, 669–682, https://doi.org/10.5194/os-10-669-2014, https://doi.org/10.5194/os-10-669-2014, 2014
T. Tanhua, D. Hainbucher, K. Schroeder, V. Cardin, M. Álvarez, and G. Civitarese
Ocean Sci., 9, 789–803, https://doi.org/10.5194/os-9-789-2013, https://doi.org/10.5194/os-9-789-2013, 2013
K. Schroeder, C. Millot, L. Bengara, S. Ben Ismail, M. Bensi, M. Borghini, G. Budillon, V. Cardin, L. Coppola, C. Curtil, A. Drago, B. El Moumni, J. Font, J. L. Fuda, J. García-Lafuente, G. P. Gasparini, H. Kontoyiannis, D. Lefevre, P. Puig, P. Raimbault, G. Rougier, J. Salat, C. Sammari, J. C. Sánchez Garrido, A. Sanchez-Roman, S. Sparnocchia, C. Tamburini, I. Taupier-Letage, A. Theocharis, M. Vargas-Yáñez, and A. Vetrano
Ocean Sci., 9, 301–324, https://doi.org/10.5194/os-9-301-2013, https://doi.org/10.5194/os-9-301-2013, 2013
C. Millot and J. Garcia-Lafuente
Ocean Sci., 7, 421–428, https://doi.org/10.5194/os-7-421-2011, https://doi.org/10.5194/os-7-421-2011, 2011
L. Grignon, D. A. Smeed, H. L. Bryden, and K. Schroeder
Ocean Sci., 6, 573–586, https://doi.org/10.5194/os-6-573-2010, https://doi.org/10.5194/os-6-573-2010, 2010
Cited articles
Allen, J. T., Painter, S. C., and Rixen, M.: Eddy transport of Western Mediterranean Intermediate Water to the Alboran Sea, J. Geophys. Res., 113, C04024, https://doi.org/10.1029/2007JC004649, 2008.
Benzohra, M. and Millot, C.: Characteristics and circulation of the surface and intermediate water masses off Algeria, Deep-Sea Res. Pt. I, 42, 10, 1803–1830, 1995.
Bethoux, J.-P.: Mean water fluxes across sections in the Mediterranean Sea, evaluated on the basis of water and salt budgets and of observed salinities, Oceanol. Ac., 3, 79–88, 1980.
Borghini, M., Bryden, H., Schroeder, K., Sparnocchia, S., and Vetrano, A.: The Mediterranean is becoming saltier, Ocean Sci., 10, 693–700, https://doi.org/10.5194/os-10-693-2014, 2014.
Borrione, I., Russo, A., Fiekas, H.-V., Heywood, K., Knoll, M., and Onken, R.: Prominent sub-mesoscale variability in the west Sardinian Sea as revealed by multi-platform sampling strategy, EGU General Assembly 2015, Vienna, Austria, 2015EGUA..17.1795B, 2015.
Bosse, A., Testor, P., Mortier, L., Prieur, L., Taillandier, V., d'Ortenzio, F., and Coppola, L.: Spreading of Levantine Intermediate Waters by submesoscale coherent vortices in the northwestern Mediterranean Sea as observed with gliders, J. Geophys. Res.-Oceans, 120, 1599–1622, https://doi.org/10.1002/2014JC010263, 2015.
Bouzinac, C., Font, J., and Millot, C.: Hydrology and currents observed in the channel of Sardinia during the PRIMO-1 experiment from November 1993 to October 1994, J. Mar. Syst., 20, 333–355, 1999.
Fuda, J.-L., Millot, C., Taupier-Letage, I., Send, U., and Bocognano, J. M.: XBT monitoring of a meridian section across the Western Mediterranean Sea, Deep-Sea Res., 47, 2191–2218, 2000.
Juza, M., Renault, L., Ruiz, S., and Tintoré, J.: Origin and pathways of Winter Intermediate Water in the Northwestern Mediterranean Sea using observations and numerical simulation, J. Geophys. Res.-Oceans, 118, 6621–6633, https://doi.org/10.1002/2013JC009231, 2013.
Juza, M., Mourre, B., Lellouche, J.-M., Tonani, M., and Tintoré, J.: From basin to sub-basin scale assessment and intercomparison of numerical simulations in the Western Mediterranean Sea, J. Mar. Syst., 149, 36–49, 2015.
Knoll, M., Benecke, J., Russo, A., and Ampolo-Rella, M.: Comparison of CTD measurements obtained by NRV Alliance and RV Planet during REP14-MED, Technical Report WTD71-0083/2015 WB, 34 pp., 2015a.
Knoll, M., Benecke, J., and Borrione, I.: ADCP measurements obtained by RV Planet during REP14-MED, Technical Report WTD71-0094/2015 WB, 52 pp., 2015b.
Krahmann, G. and Schott, F.: Longterm increases in western Mediterranean salinities and temperatures: Anthropogenic and climate sources, Geophys. Res. Lett., 25, 4209–4212, 1998.
La Violette, P. E.: Overview of the Major Forcings and Water Masses of the Western Mediterranean Sea, Coastal and Estuarine Studies, Seasonal and Interannual Variability of the Western Mediterranean Sea, edited by: P. E. La Violette, American Geophysical Union, Washington, DC, 1994.
Millot, C.: Circulation in the Western Mediterranean Sea, J. Mar. Syst., 20, 423–442, 1999.
Millot, C. and Taupier-Letage, I.: Additional evidence of LIW entrainment across the Algerian subbasin by mesoscale eddies and not by a permanent westward flow, Prog. Oceanogr., 66, 231–250, 2005.
Olita, A., Ribotti, A., Fazioli, L., Perilli, A., and Sorgente, R.: Surface circulation and upwelling in the Sardinia Sea: A numerical study, Cont. Shelf Res., 71, 95–108, https://doi.org/10.1016/j.csr.2013.10.011, 2013.
Olita, A., Iermano, I., Fazioli, L., Ribotti, A., Tedesco, C., Pessini, F., and Sorgente, R.: Impact of currents on surface flux computations and their feedback on dynamics at regional scales, Ocean Sci., 11, 657–666, https://doi.org/10.5194/os-11-657-2015, 2015.
Onken, R., Fiekas, H.-V., Beguery, L., Borrione, I., Funk, A., Hemming, M., Heywood, K. J., Kaiser, J., Knoll, M., Poulain, P.-M., Queste, B., Russo, A., Shitashima, K., Siderius, M., and Thorp-Küsel, E.: High-Resolution Observations in the Western Mediterranean Sea: The REP14-MED Experiment, Ocean Sci. Discuss., https://doi.org/10.5194/os-2016-82, in review, 2016.
Pinardi, N., Zavatarelli, M., Adani, M., Coppini, G., Fratianni, C., Oddo, P., Simoncelli, S., Tonani, M., Lyubartsev, V., Dobricic, S., and Bonaduce, A.: Mediterranean Sea large-scale low-frequency ocean variability and water mass formation rates from 1987 to 2007: A retrospective analysis, Prog. Oceanogr., 132, 318–332, https://doi.org/10.1016/j.pocean.2013.11.003, 2015.
Puillat, I., Millot, C., and Taupier-Letage, I.: Algerian Eddies lifetime can near 3 years, J. Mar. Syst., 31, 245–259, 2002.
Puillat, I., Sorgente, R., and Ribotti, A.: Circulation in the Sardinian Sea: A synergetic approach by in situ data, a three dimensional model and infrared imagery, Geophys. Res. Abst., 5, 13117, 2003.
Puillat, I., Sorgente, R., Ribotti, A., Natale, S., and Echevin, V.: Westward branching of LIW induced by Algerian anticyclonic eddies close to the Sardinian slope, Chem. Ecol., 22, 293–305, https://doi.org/10.1080/02757540600670760, 2006.
Ribotti, A., Puillat, I., Sorgent, R., and Natale, S.: Mesoscale circulation in the surface layer off the southern and western Sardinia Island in 2000–2002, Chem. Ecol., 20, 345–363, 2004.
Rixen, M., Beckers, J.-M., Levitus, S., Antonov, J., Boyer, T., Maillard, C., Fichaut, M., Balopoulus, E., Iona, S., Dooley, H., Garcia, M.-J., Manca, B., Giorgetti, A., Manzella, G., Mikhailov, N., Pinardi, N., and Zavatarelli, M.: The Western Mediterranean Deep Water: A proxy for climate change, Geophys. Res. Lett., 32, L12608, https://doi.org/10.1029/2005GL022702, 2005.
Roether, W., Klein, B., Manca, B. B., Theocharis, A., and Kioroglou, A.: Transient eastern Mediterranean deep waters in response to the massive dense-water output of the Aegean Sea in the 1990s, Prog. Ocean., 74, 540–571, https://doi.org/10.1016/j.pocean.2007.03.001, 2007.
Roether, W., Klein, B., and Hainbucher, D.: The Eastern Mediterranean Transient: Evidence for Similar Events Previously?, in: The Mediterranean Sea: Temporal Variability and Spatial Patterns, Geophysical Monograph 202. First Edition, edited by: Borzelli, G. L. E., Gačić, M., Lionello, P., and Malanotte-Rizzoli, P., ©American Geophysical Union, John Wiley & Sons, Inc, 2014.
Russo, A., Borrione, I., Falchetti, S., Knoll, M., Fiekas, H.-V., Heywood, K., Oddo, P., and Onken, R.: Intense mesoscale variability in the Sardinian Sea. EGU General Assembly 2015, Vienna, Austria, 2015EGUA..17.1745R, 2015.
Schott, F., Visbeck, M., Send, U., Fischer, J., Stramma, L., and Desaubies, Y.: Observations of deep convection in the Gulf of Lions, northern Mediterranean, during the winter of 1991/92, J. Phys. Ocean., 26, 505–524, 1996.
Schroeder, K., Ribotti, A., Borghini, M., Sorgente, R., Perilli, A., and Gasparini, G. P.: An extensive Mediterranean deep water renewal between 2004 and 2006, Geophys. Res. Lett., 35, L18605, https://doi.org/10.1029/2008GL035146, 2008.
Schroeder, K., Chiggiato, J., Bryden, H. L., Borghini, M., and Ben Ismail, S.: Abrupt climate shift in the Western Mediterranean Sea, Scientific Reports, 6, 23009, https://doi.org/10.1038/srep23009, 2016.
Sorgente, R., Ribotti, A., and Puillat, I.: Water masses and diagnostic circulation west of Sardinia from 23 March to 4 April 2001, Building the European Capacity in Operational Oceanography: Proceedings of the third international conference on EuroGOOS, edited by: Dahlin, H., Elsevier, 2003.
Sparnocchia, S., Manzella, G. M. R., and La Violette, P. E.: The Interannual and Seasonal Variability of the MAW and LIW Core Properties in the Western Mediterranean Sea, Coastal and Estuarine Studies, Seasonal and Interannual Variability of the Western Mediterranean Sea, edited by: La Violette, P. E., American Geophysical Union, Washington, DC, 1994.
Taupier-Letage, I., Puillat, I., Millot, C., and Raimbault, P.: Biological response to mesoscale eddies in the Algerian Basin, J. Geophys. Res., 108, 3245, https://doi.org/10.1029/1999JC000117, 2003.
Testor, P. and Gascard, J.-C.: Large scale flow separation and mesoscale eddy formation in the Algerian Basin, Prog. Oceanogr., 66, 211–230, 2005.
Vargas-Yáñez, M., Zunino, P., Schroeder, K., López-Jurado, J. L., Plaza, F., Serra, M., Castro, C., García-Martínez, M. C., Moya, F., and Salat, J.: Extreme Western Intermediate Water formation in winter 2010, J. Mar. Syst., 105–108, 52–59, 2012.
Short summary
The hydrography and circulation west of Sardinia, observed in June 2014 during REP14-MED by means of various measuring platforms, are presented and compared with previous knowledge. So far, the circulation of this area is not well-known and the hydrography is subject to long-term changes. The different water masses are characterized and temporal changes are emphasized. The observed eddies are specified and geostrophic transports in the upper ocean are presented.
The hydrography and circulation west of Sardinia, observed in June 2014 during REP14-MED by...