Caneill, R., Roquet, F., Madec, G., and Nycander, J.: The Polar Transition from Alpha to Beta Regions Set by a Surface Buoyancy Flux Inversion, J. Phys. Oceanogr., 52, 1887–1902,
https://doi.org/10.1175/JPO-D-21-0295.1, 2022.
a,
b,
c,
d,
e,
f
Carmack, E. C.: The alpha/beta ocean distinction: A perspective on freshwater fluxes, convection, nutrients and productivity in high-latitude seas, Deep-Sea Res. Pt. II, 54, 2578–2598,
https://doi.org/10.1016/j.dsr2.2007.08.018, 2007.
a,
b
Cerovečki, I. and Mazloff, M. R.: The Spatiotemporal Structure of Diabatic Processes Governing the Evolution of Subantarctic Mode Water in the Southern Ocean, J. Phys. Oceanogr., 46, 683–710,
https://doi.org/10.1175/JPO-D-14-0243.1, 2016.
a
Cerovečki, I., Talley, L. D., and Mazloff, M. R.: A Comparison of Southern Ocean Air–Sea Buoyancy Flux from an Ocean State Estimate with Five Other Products, J. Climate, 24, 6283–6306,
https://doi.org/10.1175/2011JCLI3858.1, 2011.
a
Cerovečki, I., Talley, L. D., Mazloff, M. R., and Maze, G.: Subantarctic Mode Water Formation, Destruction, and Export in the Eddy-Permitting Southern Ocean State Estimate, J. Phys. Oceanogr., 43, 1485–1511,
https://doi.org/10.1175/JPO-D-12-0121.1, 2013.
a
Cerovečki, I., Meijers, A. J. S., Mazloff, M. R., Gille, S. T., Tamsitt, V. M., and Holland, P. R.: The Effects of Enhanced Sea Ice Export from the Ross Sea on Recent Cooling and Freshening of the Southeast Pacific, J. Climate, 32, 2013–2035,
https://doi.org/10.1175/JCLI-D-18-0205.1, 2019.
a
Cherian, D., Almansi, M., Bourgault, P., Thyng, K., Thielen, J., Magin, J., Aoun, A., Buntemeyer, L., Caneill, R., Davis, L., Fernandes, F., Hauser, M., Heerdegen, A., Kent, J., Mankoff, K., Müller, S., Schupfner, M., Vo, T., and Haëck, C.: cf_xarray, Zenodo [code],
https://doi.org/10.5281/zenodo.8152257, 2023.
a
de Boyer Montégut, C.: Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology, J. Geophys. Res., 109, C12003,
https://doi.org/10.1029/2004JC002378, 2004.
a
de Boyer Montégut, C.: Mixed layer depth climatology computed with a density threshold criterion of 0.03 kg/m
3 from 10 m depth value, SEANOE [data set],
https://doi.org/10.17882/91774, 2023.
a,
b
Dong, S., Gille, S. T., and Sprintall, J.: An Assessment of the Southern Ocean Mixed Layer Heat Budget, J. Climate, 20, 4425–4442,
https://doi.org/10.1175/JCLI4259.1, 2007.
a,
b,
c
Dong, S., Sprintall, J., Gille, S. T., and Talley, L.: Southern Ocean mixed-layer depth from Argo float profiles, J. Geophys. Res., 113, C06013,
https://doi.org/10.1029/2006JC004051, 2008.
a,
b
DuVivier, A. K., Large, W. G., and Small, R. J.: Argo Observations of the Deep Mixing Band in the Southern Ocean: A Salinity Modeling Challenge, J. Geophys. Res.-Oceans, 123, 7599–7617,
https://doi.org/10.1029/2018JC014275, 2018.
a,
b,
c,
d,
e,
f
ECCO Consortium, Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., and Ponte, R. M.: ECCO Central Estimate (Version 4 Release 4),
https://ecco.jpl.nasa.gov/drive, last access: 15 March 2022. a
ECCO Consortium, Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., and Ponte, R.: Synopsis of the ECCO central production global ocean and sea-ice state estimate (version 4 release 4), Zenodo [code],
https://doi.org/10.5281/zenodo.4533349, 2021.
a
EU Copernicus Marine Service Information (CMEMS): Global Ocean Hourly Reprocessed Sea Surface Wind and Stress from Scatterometer and Mode, Marine Data Store (MDS) [data set],
https://doi.org/10.48670/moi-00185 2023a.
a
EU Copernicus Marine Service Information (CMEMS): Multi Observation Global Ocean 3D Temperature Salinity Height Geostrophic Current and MLD, Marine Data Store (MDS) [data set],
https://doi.org/10.48670/moi-00052, 2023b.
a
Fernández Castro, B., Mazloff, M., Williams, R. G., and Naveira Garabato, A. C.: Subtropical Contribution to Sub‐Antarctic Mode Waters, Geophys. Res. Lett., 49, e2021GL097560,
https://doi.org/10.1029/2021GL097560, 2022.
a,
b
Forget, G., Campin, J.-M., Heimbach, P., Hill, C. N., Ponte, R. M., and Wunsch, C.: ECCO version 4: an integrated framework for non-linear inverse modeling and global ocean state estimation, Geosci. Model Dev., 8, 3071–3104,
https://doi.org/10.5194/gmd-8-3071-2015, 2015.
a
Frölicher, T. L., Sarmiento, J. L., Paynter, D. J., Dunne, J. P., Krasting, J. P., and Winton, M.: Dominance of the Southern Ocean in Anthropogenic Carbon and Heat Uptake in CMIP5 Models, J. Climate, 28, 862–886,
https://doi.org/10.1175/JCLI-D-14-00117.1, 2015.
a
Garrett, C., Outerbridge, R., and Thompson, K.: Interannual Variability in Meterrancan Heat and Buoyancy Fluxes, J. Climate, 6, 900–910,
https://doi.org/10.1175/1520-0442(1993)006<0900:IVIMHA>2.0.CO;2, 1993.
a
Gruber, N., Clement, D., Carter, B. R., Feely, R. A., Van Heuven, S., Hoppema, M., Ishii, M., Key, R. M., Kozyr, A., Lauvset, S. K., Lo Monaco, C., Mathis, J. T., Murata, A., Olsen, A., Perez, F. F., Sabine, C. L., Tanhua, T., and Wanninkhof, R.: The oceanic sink for anthropogenic CO
2 from 1994 to 2007, Science, 363, 1193–1199,
https://doi.org/10.1126/science.aau5153, 2019.
a
Guinehut, S., Dhomps, A.-L., Larnicol, G., and Le Traon, P.-Y.: High resolution 3-D temperature and salinity fields derived from in situ and satellite observations, Ocean Sci., 8, 845–857,
https://doi.org/10.5194/os-8-845-2012, 2012.
a
Hanawa, K. and Talley, L. D.: Chapt. 5.4: Mode waters, in: Ocean Circulation and Climate, edited by: Siedler, G., Church, J., and Gould, J., vol. 77 of International Geophysics, Academic Press, 373–386,
https://doi.org/10.1016/S0074-6142(01)80129-7, 2001.
a
Herrmann, M., Somot, S., Sevault, F., Estournel, C., and Déqué, M.: Modeling the deep convection in the northwestern Mediterranean Sea using an eddy-permitting and an eddy-resolving model: Case study of winter 1986–1987, J. Geophys. Res., 113, C04011,
https://doi.org/10.1029/2006JC003991, 2008.
a
Holte, J. W., Talley, L. D., Chereskin, T. K., and Sloyan, B. M.: The role of air-sea fluxes in Subantarctic Mode Water formation: SAMW FORMATION, J. Geophys. Res.-Oceans, 117, C03040,
https://doi.org/10.1029/2011JC007798, 2012.
a,
b,
c
IOC, SCOR, and IAPSO: The International thermodynamic equation of seawater – 2010: calculation and use of thermodynamic properties, Intergovernmental Oceanographic Com mission, Manuals and Guides, 56, 220,
http://teos-10.org/pubs/TEOS-10_Manual.pdf (last access: 12 October 2023), 2015. a
Josey, S. A., Grist, J. P., Mecking, J. V., Moat, B. I., and Schulz, E.: A clearer view of Southern Ocean air–sea interaction using surface heat flux asymmetry, Philos. T. Roy. Soc. A, 381, 20220067,
https://doi.org/10.1098/rsta.2022.0067, 2023.
a
Klocker, A., Naveira Garabato, A. C., Roquet, F., De Lavergne, C., and Rintoul, S. R.: Generation of the Internal Pycnocline in the Subpolar Southern Ocean by Wintertime Sea Ice Melting, J. Geophys. Res.-Oceans, 128, e2022JC019113,
https://doi.org/10.1029/2022JC019113, 2023.
a,
b
Kostianoy, A. G., Ginzburg, A. I., Frankignoulle, M., and Delille, B.: Fronts in the Southern Indian Ocean as inferred from satellite sea surface temperature data, J. Marine Syst., 45, 55–73,
https://doi.org/10.1016/j.jmarsys.2003.09.004, 2004.
a
Lascaratos, A. and Nittis, K.: A high-resolution three-dimensional numerical study of intermediate water formation in the Levantine Sea, J. Geophys. Res.-Oceans, 103, 18497–18511,
https://doi.org/10.1029/98JC01196, 1998.
a
Lee, M.-M., Nurser, A. J. G., Stevens, I., and Sallée, J.-B.: Subduction over the Southern Indian Ocean in a High-Resolution Atmosphere–Ocean Coupled Model, J. Climate, 24, 3830–3849,
https://doi.org/10.1175/2011JCLI3888.1, 2011.
a
Li, Q. and England, M. H.: Tropical Indo‐Pacific Teleconnections to Southern Ocean Mixed Layer Variability, Geophys. Res. Lett., 47, e2020GL088466,
https://doi.org/10.1029/2020GL088466, 2020.
a
Li, Q. and Lee, S.: A Mechanism of Mixed Layer Formation in the Indo–Western Pacific Southern Ocean: Preconditioning by an Eddy-Driven Jet-Scale Overturning Circulation, J. Phys. Oceanogr., 47, 2755–2772,
https://doi.org/10.1175/JPO-D-17-0006.1, 2017.
a
Li, Z., Groeskamp, S., Cerovečki, I., and England, M. H.: The Origin and Fate of Antarctic Intermediate Water in the Southern Ocean, J. Phys. Oceanogr., 52, 2873–2890,
https://doi.org/10.1175/JPO-D-21-0221.1, 2022.
a
Li, Z., England, M. H., and Groeskamp, S.: Recent acceleration in global ocean heat accumulation by mode and intermediate waters, Nat. Commun., 14, 6888,
https://doi.org/10.1038/s41467-023-42468-z, 2023.
a
Mölder, F., Jablonski, K., Letcher, B., Hall, M., Tomkins-Tinch, C., Sochat, V., Forster, J., Lee, S., Twardziok, S., Kanitz, A., Wilm, A., Holtgrewe, M., Rahmann, S., Nahnsen, S., and Köster, J.: Sustainable data analysis with Snakemake, F1000Research, 10, 33,
https://doi.org/10.12688/f1000research.29032.1, 2021.
a
Naveira Garabato, A. C., Jullion, L., Stevens, D. P., Heywood, K. J., and King, B. A.: Variability of Subantarctic Mode Water and Antarctic Intermediate Water in the Drake Passage during the Late-Twentieth and Early-Twenty-First Centuries, J. Climate, 22, 3661–3688,
https://doi.org/10.1175/2009JCLI2621.1, 2009.
a
Nycander, J., Hieronymus, M., and Roquet, F.: The nonlinear equation of state of sea water and the global water mass distribution: Global Water Mass Distribution, Geophys. Res. Lett., 42, 7714–7721,
https://doi.org/10.1002/2015GL065525, 2015.
a,
b
Orsi, A. H., Whitworth, T., and Nowlin, W. D.: On the meridional extent and fronts of the Antarctic Circumpolar Current, Deep-Sea Res. Pt. I, 42, 641–673,
https://doi.org/10.1016/0967-0637(95)00021-W, 1995.
a
Park, Y., Park, T., Kim, T., Lee, S., Hong, C., Lee, J., Rio, M., Pujol, M., Ballarotta, M., Durand, I., and Provost, C.: Observations of the Antarctic Circumpolar Current Over the Udintsev Fracture Zone, the Narrowest Choke Point in the Southern Ocean, J. Geophys. Res.-Oceans, 124, 4511–4528,
https://doi.org/10.1029/2019JC015024, 2019.
a,
b,
c
Pauthenet, E., Roquet, F., Madec, G., and Nerini, D.: A Linear Decomposition of the Southern Ocean Thermohaline Structure, J. Phys. Oceanogr., 47, 29–47,
https://doi.org/10.1175/JPO-D-16-0083.1, 2017.
a
Pellichero, V., Sallée, J.-B., Chapman, C. C., and Downes, S. M.: The southern ocean meridional overturning in the sea-ice sector is driven by freshwater fluxes, Nat. Commun., 9, 1789,
https://doi.org/10.1038/s41467-018-04101-2, 2018.
a
Pollard, R., Lucas, M., and Read, J.: Physical controls on biogeochemical zonation in the Southern Ocean, Deep-Sea Res. Pt. II, 49, 3289–3305,
https://doi.org/10.1016/S0967-0645(02)00084-X, 2002.
a,
b
Roach, C. J., Phillips, H. E., Bindoff, N. L., and Rintoul, S. R.: Detecting and Characterizing Ekman Currents in the Southern Ocean, J. Phys. Oceanogr., 45, 1205–1223,
https://doi.org/10.1175/JPO-D-14-0115.1, 2015.
a
Roemmich, D., Church, J., Gilson, J., Monselesan, D., Sutton, P., and Wijffels, S.: Unabated planetary warming and its ocean structure since 2006, Nat. Clim. Change, 5, 240–245,
https://doi.org/10.1038/nclimate2513, 2015.
a
Roquet, F., Madec, G., Brodeau, L., and Nycander, J.: Defining a Simplified Yet “Realistic” Equation of State for Seawater, J. Phys. Oceanogr., 45, 2564–2579,
https://doi.org/10.1175/JPO-D-15-0080.1, 2015.
a,
b
Roquet, F., Ferreira, D., Caneill, R., Schlesinger, D., and Madec, G.: Unique thermal expansion properties of water key to the formation of sea ice on Earth, Sci. Adv., 8, eabq0793,
https://doi.org/10.1126/sciadv.abq0793, 2022.
a,
b,
c
Sabine, C. L., Feely, R. A., Gruber, N., Key, R. M., Lee, K., Bullister, J. L., Wanninkhof, R., Wong, C. S., Wallace, D. W. R., Tilbrook, B., Millero, F. J., Peng, T.-H., Kozyr, A., Ono, T., and Rios, A. F.: The Oceanic Sink for Anthropogenic CO
2, Science, 305, 367–371,
https://doi.org/10.1126/science.1097403, 2004.
a
Sallée, J.-B., Wienders, N., Speer, K., and Morrow, R.: Formation of subantarctic mode water in the southeastern Indian Ocean, Ocean Dynam., 56, 525–542,
https://doi.org/10.1007/s10236-005-0054-x, 2006.
a,
b
Sallée, J.-B., Morrow, R., and Speer, K.: Eddy heat diffusion and Subantarctic Mode Water formation, Geophys. Res. Lett., 35, L05607,
https://doi.org/10.1029/2007GL032827, 2008.
a
Sallée, J.-B., Speer, K., Rintoul, S., and Wijffels, S.: Southern Ocean Thermocline Ventilation, J. Phys. Oceanogr., 40, 509–529,
https://doi.org/10.1175/2009JPO4291.1, 2010.
a
Schiffer, R. A. and Rossow, W. B.: The International Satellite Cloud Climatology Project (ISCCP): The first project of the World Climate Research Programme, B. Am. Meteorol. Soc., 64, 779–784, 1983.
a,
b
Schmidtko, S., Johnson, G. C., and Lyman, J. M.: MIMOC: A global monthly isopycnal upper-ocean climatology with mixed layers: MIMOC, J. Geophys. Res.-Oceans, 118, 1658–1672,
https://doi.org/10.1002/jgrc.20122, 2013.
a,
b,
c
Sloyan, B. M., Talley, L. D., Chereskin, T. K., Fine, R., and Holte, J.: Antarctic Intermediate Water and Subantarctic Mode Water Formation in the Southeast Pacific: The Role of Turbulent Mixing, J. Phys. Oceanogr., 40, 1558–1574,
https://doi.org/10.1175/2010JPO4114.1, 2010.
a,
b
Small, R. J., DuVivier, A. K., Whitt, D. B., Long, M. C., Grooms, I., and Large, W. G.: On the control of subantarctic stratification by the ocean circulation, Clim. Dynam., 56, 299–327,
https://doi.org/10.1007/s00382-020-05473-2, 2021.
a,
b
Song, X.: Explaining the Zonal Asymmetry in the Air-Sea Net Heat Flux Climatology Over the Antarctic Circumpolar Current, J. Geophys. Res.-Oceans, 125, e2020JC016215,
https://doi.org/10.1029/2020JC016215, 2020.
a
Speer, K., Rintoul, S. R., and Sloyan, B.: The Diabatic Deacon Cell, J. Phys. Oceanogr., 30, 3212–3222,
https://doi.org/10.1175/1520-0485(2000)030<3212:TDDC>2.0.CO;2, 2000.
a
Sterl, M. F. and De Jong, M. F.: Restratification Structure and Processes in the Irminger Sea, J. Geophys. Res.-Oceans, 127, e2022JC019126,
https://doi.org/10.1029/2022JC019126, 2022.
a
Swart, S., Gille, S. T., Delille, B., Josey, S., Mazloff, M., Newman, L., Thompson, A. F., Thomson, J., Ward, B., Du Plessis, M. D., Kent, E. C., Girton, J., Gregor, L., Heil, P., Hyder, P., Pezzi, L. P., De Souza, R. B., Tamsitt, V., Weller, R. A., and Zappa, C. J.: Constraining Southern Ocean Air-Sea-Ice Fluxes Through Enhanced Observations, Front. Mar. Sci., 6, 421,
https://doi.org/10.3389/fmars.2019.00421, 2019.
a
Tamsitt, V., Talley, L. D., Mazloff, M. R., and Cerovečki, I.: Zonal Variations in the Southern Ocean Heat Budget, J. Climate, 29, 6563–6579,
https://doi.org/10.1175/JCLI-D-15-0630.1, 2016.
a
Virtanen, P., Gommers, R., Oliphant, T. E., Haberland, M., Reddy, T., Cournapeau, D., Burovski, E., Peterson, P., Weckesser, W., Bright, J., van der Walt, S. J., Brett, M., Wilson, J., Millman, K. J., Mayorov, N., Nelson, A. R. J., Jones, E., Kern, R., Larson, E., Carey, C. J., Polat, İ., Feng, Y., Moore, E. W., VanderPlas, J., Laxalde, D., Perktold, J., Cimrman, R., Henriksen, I., Quintero, E. A., Harris, C. R., Archibald, A. M., Ribeiro, A. H., Pedregosa, F., van Mulbregt, P., and SciPy 1.0 Contributors: SciPy 1.0: Fundamental Algorithms for Scientific Computing in Python, Nat. Meth., 17, 261–272,
https://doi.org/10.1038/s41592-019-0686-2, 2020.
a
Wang, J., Mazloff, M. R., and Gille, S. T.: Pathways of the Agulhas waters poleward of 29°S, J. Geophys. Res.-Oceans, 119, 4234–4250,
https://doi.org/10.1002/2014JC010049, 2014.
a
Yang, J.: The Seasonal Variability of the Arctic Ocean Ekman Transport and Its Role in the Mixed Layer Heat and Salt Fluxes, J. Climate, 19, 5366–5387,
https://doi.org/10.1175/JCLI3892.1, 2006.
a
Yu, L. and Weller, R. A.: Objectively Analyzed Air–Sea Heat Fluxes for the Global Ice-Free Oceans (1981–2005), B. Am. Meteorol. Soc., 88, 527–540,
https://doi.org/10.1175/BAMS-88-4-527, 2007.
a,
b
