کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6384201 | 1626435 | 2014 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phytoplankton blooms beneath the sea ice in the Chukchi sea
ترجمه فارسی عنوان
فیتوپلانکتون زیر یخ دریا در دریای چوچهای شکوفه می کند
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کلمات کلیدی
قطب شمال، یخ دریایی، فیتوپلانکتون،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
In the Arctic Ocean, phytoplankton blooms on continental shelves are often limited by light availability, and are therefore thought to be restricted to waters free of sea ice. During July 2011 in the Chukchi Sea, a large phytoplankton bloom was observed beneath fully consolidated pack ice and extended from the ice edge to >100 km into the pack. The bloom was composed primarily of diatoms, with biomass reaching 1291 mg chlorophyll a mâ2 and rates of carbon fixation as high as 3.7 g C mâ2 dâ1. Although the sea ice where the bloom was observed was near 100% concentration and 0.8-1.2 m thick, 30-40% of its surface was covered by melt ponds that transmitted 4-fold more light than adjacent areas of bare ice, providing sufficient light for phytoplankton to bloom. Phytoplankton growth rates associated with the under-ice bloom averaged 0.9 dâ1 and were as high as 1.6 dâ1. We argue that a thinning sea ice cover with more numerous melt ponds over the past decade has enhanced light penetration through the sea ice into the upper water column, favoring the development of these blooms. These observations, coupled with additional biogeochemical evidence, suggest that phytoplankton blooms are currently widespread on nutrient-rich Arctic continental shelves and that satellite-based estimates of annual primary production in waters where under-ice blooms develop are ~10-fold too low. These massive phytoplankton blooms represent a marked shift in our understanding of Arctic marine ecosystems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 105, July 2014, Pages 1-16
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 105, July 2014, Pages 1-16
نویسندگان
Kevin R. Arrigo, Donald K. Perovich, Robert S. Pickart, Zachary W. Brown, Gert L. van Dijken, Kate E. Lowry, Matthew M. Mills, Molly A. Palmer, William M. Balch, Nicholas R. Bates, Claudia R. Benitez-Nelson, Emily Brownlee, Karen E. Frey,