Seasonal and spatial distribution of particulate organic matter (POM) in the Chukchi and Beaufort Seas
Seasonal and spatial distribution of particulate organic matter (POM) in the Chukchi and Beaufort Seas
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DOI：
10.1016/j.dsr2.2005.10.003
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发表时间：
2005-01-01
影响因子：
3
通讯作者：
Codispoti, LA
中科院分区：
文献类型：
--
作者：
Bates, NR;Hansell, DA;Codispoti, LA
作为西部北极陆架-盆地相互作用项目的一部分，在2002年春季(5月5日至6月15日)和夏季(7月15日至8月25日)航次期间，调查了楚科奇海和波弗特海陆架有机碳和氮的生产和去向。对悬浮颗粒有机碳(POC)、氮(PON)和大颗粒(>；53亩m)的季节观测表明，由于浮游植物生产力的提高，表层混合层在春季和夏季有大量的碳(C)和氮(N)的积累。相当大的有机物质似乎是在上层盐跃层顶部升高的POC和PON层中从陆架输送到北冰洋盆地的。悬浮颗粒有机物(POM)池中碳/氮(C：N)摩尔比的季节变化反映了存在的有机物质质量的变化，这些有机物质可能被输出到沉积物和楚科奇和博福特海大陆架附近的北冰洋水域。春季，富含硝酸盐的表层水体颗粒碳氮比较低(~lt；6；即富N)。到了夏季，在硝酸盐耗竭的地表水中观察到局部高的颗粒C：N比(>；9；即贫氮)。在表层观察到的低POC和无机营养物质浓度表明，北冰洋加拿大盆地地区的初级、新产品和出口产品的比率很低。(C)2005爱思唯尔有限公司。保留所有权利。
As part of the Western Arctic Shelf-Basin Interactions (SBI) project, the production and fate of organic carbon and nitrogen from the Chukchi and Beaufort Sea shelves were investigated during spring (5 May-15 June) and summer (15 July-25 August) cruises in 2002. Seasonal observations of suspended particulate organic carbon (POC) and nitrogen (PON) and large-particle (> 53 mu m) size class suggest that there was a large accumulation of carbon (C) and nitrogen (N) between spring and summer in the surface mixed layer due to high phytoplankton productivity. Considerable organic matter appeared to be transported from the shelf into the Arctic Ocean basin in an elevated POC and PON layer at the top of the upper halocline. Seasonal changes in the molar carbon:nitrogen (C:N) ratio of the suspended particulate organic matter (POM) pool reflect a change in the quality of the organic material that was present and presumably being exported to the sediment and to Arctic Ocean waters adjacent to the Chukchi and Beaufort Sea shelves. In spring, low particulate C:N ratios (< 6; i.e., N rich) were observed in nitrate-replete surface waters. By the summer, localized high particulate C:N ratios (> 9; i.e., N-poor) were observed in nitrate-depleted surface waters. Low POC and inorganic nutrient concentrations observed in the surface layer suggest that rates of primary, new and export production are low in the Canada Basin region of the Arctic Ocean. (c) 2005 Elsevier Ltd. All rights reserved.