Phytoplankton distribution in unusually low sea ice cover over the Pacific Arctic
Phytoplankton distribution in unusually low sea ice cover over the Pacific Arctic
复制标题
北极太平洋上空异常低的海冰覆盖中浮游植物的分布
DOI：
10.5194/bg-9-4835-2012
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发表时间：
2012-01-01
期刊：
影响因子：
4.9
通讯作者：
Ruiz-Pino, D.
中科院分区：
文献类型：
--
作者：
Coupel, P.;Jin, H. Y.;Ruiz-Pino, D.
太平洋北极盆地的大部分地区在夏季经历无冰状态，这是过去几十年来海冰覆盖稳步减少的结果。为了评估海冰退缩对海洋生态系统的影响，2008年在楚科奇陆架和加拿大盆地进行了浮游植物原位观测，这是一个高融化的年份。利用色素分析和分类枚举法对主要浮游植物类群的分布进行了描述。2008年夏季浮游植物分布具有明显的空间变异性。8个浮游植物功能类群和3个大小类（微型、纳米和微型浮游植物）的比较也显示，低冰夏季（2008年）和重冰夏季（1994年）在丰度、生物量和分布上存在显著差异。讨论了1994 - 2008年浮游植物群落结构差异的可能原因，包括新鲜、分层、光照和养分有效性等环境参数。
A large part of the Pacific Arctic basin experiences ice-free conditions in summer as a result of sea ice cover steadily decreasing over the last decades. To evaluate the impact of sea ice retreat on the marine ecosystem, phytoplankton in situ observations were acquired over the Chukchi shelf and the Canadian basin in 2008, a year of high melting. Pigment analyses and taxonomy enumerations were used to characterise the distribution of main phytoplanktonic groups. Marked spatial variability of the phytoplankton distribution was observed in summer 2008. Comparison of eight phytoplankton functional groups and 3 size-classes (pico-, nano- and micro-phytoplankton) also showed significant differences in abundance, biomass and distribution between summer of low ice cover (2008) and heavy ice summer (1994). Environmental parameters such as freshening, stratification, light and nutrient availability are discussed as possible causes to explain the observed differences in phytoplankton community structure between 1994 and 2008.