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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2017-234
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-2017-234
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Submitted as: research article 12 Jul 2017

Submitted as: research article | 12 Jul 2017

Review status
This discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The manuscript was not accepted for further review after discussion.

Field-obtained carbon and nitrogen uptake rates of phytoplankton in the Laptev and East Siberian seas

Sang Heon Lee1, Jang Han Lee1, Howon Lee1, Jae Joong Kang1, Jae Hyung Lee1, Dabin Lee1, SoHyun An1, Dean A. Stockwell2, and Terry E. Whitledge2 Sang Heon Lee et al.
  • 1Department of Oceanography, Pusan National University, Busan 609-735, Korea
  • 2Institute of Marine Science, University of Alaska, Fairbanks, AK 99775, USA

Abstract. The Laptev and East Siberian seas are the least biologically studied region in the Arctic Ocean, although they are highly dynamic in terms of active processing of organic matter impacting the transport to the deep Arctic Ocean. Field-measured carbon and nitrogen uptake rates of phytoplankton were conducted in the Laptev and East Siberian seas as part of the NABOS (Nansen and Amundsen Basins Observational System) program. Major inorganic nutrients were mostly depleted at 100–50 % light depths but were not depleted within the euphotic depths in the Laptev and East Siberian seas. The water column-integrated chl-a concentration in this study was significantly higher than that in the western Arctic Ocean (t-test, p > 0.01). Unexpectedly, the daily carbon and nitrogen uptake rates in this study (average ± S.D. = 110.3 ± 88.3 mg C m−2 d−1 and 37.0 ± 25.8 mg N m−2 d−1, respectively) are within previously reported ranges. Surprisingly, the annual primary production (13.2 g C m−2) measured in the field during the vegetative season is approximately one order of magnitude lower than the primary production reported from a satellite–based estimation. Further validation using field-measured observations is necessary for a better projection of the ecosystem in the Laptev and East Siberian seas responding to ongoing climate change.

Sang Heon Lee et al.
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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Sang Heon Lee et al.
Sang Heon Lee et al.
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Short summary
The Laptev and East Siberian seas are highly dynamic in terms of active processing of organic matters impacting the transport to the deep Arctic Ocean. However, they have been the least biologically studied region in the Arctic Ocean. As a part of the NABOS program, our field-measured data, which are very scarce in this region, such as major inorganic nutrient and chl-a concentrations and carbon and nitrogen uptake rates of phytoplankton in this study will be very valuable for basic ground.
The Laptev and East Siberian seas are highly dynamic in terms of active processing of organic...
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