Dear Drs. Shi and Wallace,

Thank you for the revised version of your manuscript, which is almost ready for publication. Please see the last few comments by referee #1 and below I have listed my comments. Please prepare the final version of your manuscript taking into account these comments.

In this paper new measured data from DIN, dissolved oxygen and chlorophyll a are presented besides the iodocarbons. For these measurements the reader is referred to Burt et al. (2013). However, the data from Burt et al were collected before the data from the present study. I think it would be useful and necessary to present the additional measurements briefly including their precision/accuracy.

P7, L13 psu is not a unit. I would advise not to use it.
P14, L12 “is shown in F.” There appears to be something missing here.

P17, L16 Please define DOM here as this has not been done before.
P26-27, L23-1 delete “although both factors,”

References
P30, L22 224Ra with 224 superscript
P33, L3 CH2I2, CH2ICl, and CH2IBr please use subscripts
P33, L5 CH3I, C2H5I, 1-C3H7I, and 2-C3H7I please use subscripts
P34, L22 Please add doi for completion of reference.
P35, L19 CH 2 Br 2, CH 2 I 2 and CH 2 BrI please use subscripts, and check format
P36, L6 delete: [online] Available from:
P36, L13 (CH3I) please use subscripts
P36, L14 Correct author names: Rattigan, O.V., Shallcross, D.E., and R. Anthony Cox, R.A.:
P36, L15 CF 3 I, CH 3 I, C 2 H 5 I and CH 2 ICl please use subscripts, and check format
P37, L21 delete: (BG)
P38, L1 delete: (BG)
P38, L11 This reference format needs a doi
P38, L14 This reference format needs a doi

With best wishes
Mario Hoppema