Deep ocean nutrients imply large latitudinal variation in particle transfer efficiency

Weber Thomas; Cram Jacob A.; Leung Shirley W.DeVries TimothyDeutsch Curtis

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Deep ocean nutrients imply large latitudinal variation in particle transfer efficiency

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The "transfer efficiency" of sinking organic particles through the mesopelagic zone and into the deep ocean is a critical determinant of the atmosphere-ocean partition of carbon dioxide (CO2). Our ability to detect large-scale spatial variations in transfer efficiency is limited by the scarcity and uncertainties of particle flux data. Here we reconstruct deep ocean particle fluxes by diagnosing the rate of nutrient accumulation along transport pathways in a data-constrained ocean circulation model. Combined with estimates of organic matter export from the surface, these diagnosed fluxes reveal a global pattern of transfer efficiency to 1,000m that is high (similar to 25) at high latitudes and low (similar to 5) in subtropical gyres, with intermediate values in the tropics. This pattern is well correlated with spatial variations in phytoplankton community structure and the export of ballast minerals, which control the size and density of sinking particles. These findings accentuate the importance of high-latitude oceans in sequestering carbon over long timescales, and highlight potential impacts on remineralization depth as phytoplankton communities respond to a warming climate.

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2016年第31期|8606-8611|共6页
作者
Weber Thomas; Cram Jacob A.; Leung Shirley W.DeVries TimothyDeutsch Curtis;
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作者单位

Univ Washington, Sch Oceanog, Seattle, WA 98195 USA;

Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
biological pump; organic particles; remineralization; transfer efficiency; ocean carbon storage;

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Deep ocean nutrients imply large latitudinal variation in particle transfer efficiency

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