کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4537489 1626498 2008 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modeling the nitrogen and carbon cycling in Marguerite Bay, Antarctica: Annual variations in ammonium and net community production
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Modeling the nitrogen and carbon cycling in Marguerite Bay, Antarctica: Annual variations in ammonium and net community production
چکیده انگلیسی

A quasi-two-dimensional biogeochemical model was applied to Marguerite Bay to investigate differences in the seasonal cycles of nitrogen and carbon of the plankton communities between 2000–2001 and 2001–2002. The impetus for the modeling effort came from observations made during the US SO Southern Ocean Global Ocean Ecosystem dynamics (SO GLOBEC) program field surveys in 2001 and 2002 that showed a two-fold decrease in net community production (NCP) and ammonium stocks. Simulated nutrient fields matched these observations, indicating that NCP was mainly controlled by the availability of light to phytoplankton. Greater sea-ice cover led to a shorter phytoplankton bloom in 2001–2002 than in 2000–2001. Furthermore, the simulated lower primary production led to smaller bacterial ammonification during the second year. Additionally, smaller zooplankton stocks were observed that led to less simulated excretion of ammonium during 2002. The results of the numerical simulations showed that remineralization of organic matter to ammonium by bacteria accounted for up to 45% of the ammonium production during each year.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 55, Issues 3–4, February 2008, Pages 393–411
نویسندگان
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