Quantification of new production during a winter Noctiluca scintillans bloom in the Arabian Sea

Details Quantification of new production during a winter Noctiluca scintillans bloom in the Arabian Sea Quantification of new production during a winter Noctiluca scintillans bloom in the Arabian Sea

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3508604p&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 8, CiteID L08604

Mathematics

Logic

2

Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Carbon Cycling (0428), Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041), Oceanography: Biological And Chemical: Photosynthesis, Oceanography: Biological And Chemical: Phytoplankton

Scientific paper

We present new data on the nitrate (new production), ammonium, urea uptake rates and f-ratios for the eastern Arabian Sea (10° to 22°N) during the late winter (northeast) monsoon, 2004, including regions of green Noctiluca scintillans bloom. A comparison of N-uptake rates of the Noctiluca dominated northern zone to the southern non-bloom zone indicates the presence of two biogeochemical regimes during the late winter monsoon: highly productive north and less productive south. The conservative estimates of photic zone-integrated total N-uptake and f-ratio are high in the north (~19 mmolNm-2d-1 and 0.82, respectively) during the bloom and low (~5.5 mmolNm-2d-1 and 0.38 respectively) in the south. The present and earlier data imply persistence of high N-uptake and f-ratio during blooms year after year. This quantification of the enhanced seasonal sequestration of carbon is an important input to global biogeochemical models.

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