Dear Authors,

Thank you very much for your point-by-point responses to the reviewers' comments. I believe your replies are mostly reasonable and appropriate. However, I would like to send your revised manuscript to one of the reviewers again for further review, because the expert asked you a major revision. So please submit the latest version of your revised manuscript to us.

Thank you again for your nice effort to improve the manuscript.

Kind regards,

Koji Suzuki
Editor

Dear Authors,

Thank you very much for your revised manuscript with the point-by-point responses to the reviewers' comments. All reviewers and I were very pleased to find significant improvements of your manuscript.

Attached are further suggestions from two referees to improve the manuscript. So we would appreciate it very much if you could make a further revised manuscript following their suggestions.

Thank you again for your wonderful effort.

Best regards,

Koji Suzuki
Editor

Dear Dr. Schuback,

It is a great pleasure now to accept your manuscript for publication in Biogeosciences. Thank you very much for responding to the reviewers' comments carefully.

Before it is published, please consider my editorial comments below:

L137: Whatman GF/F

L137: It seems that “< 5 mm Hg” is extremely low. Is it “<5 cm Hg”?

L286: Add a space between 51490 and mol.

L567-570: Please cite the following paper in the paragraph, because Suzuki et al. (2002) also reported pronounced diurnal variation of Fv/Fm at ca. 5 m of Ocean Station Papa, where iron availability was low and irradiance was relatively high around noon, using FRRF.

Suzuki, K., Liu, H., Saino, T., Obata, H., Takano, M., Okamura, K., Sohrin, Y., and Fujishima, Y.: East-west gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer. Limnol. Oceanogr., 47, 1581-1594, 2002.


Thank you again for choosing the EGU-journal Biogeosciences.

Sincerely,

Koji Suzuki
Editor