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首页> 美国卫生研究院文献>Philosophical transactions. Series A Mathematical physical and engineering sciences >Changes in the upper ocean mixed layer and phytoplankton productivity along the West Antarctic Peninsula
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Changes in the upper ocean mixed layer and phytoplankton productivity along the West Antarctic Peninsula

机译：南极西部半岛上层海洋混合层和浮游植物生产力的变化

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摘要

The West Antarctic Peninsula (WAP) has experienced significant change over the last 50 years. Using a 24 year spatial time series collected by the Palmer Long Term Ecological Research programme, we assessed long-term patterns in the sea ice, upper mixed layer depth (MLD) and phytoplankton productivity. The number of sea ice days steadily declined from the 1980s until a recent reversal that began in 2008. Results show regional differences between the northern and southern regions sampled during regional ship surveys conducted each austral summer. In the southern WAP, upper ocean MLD has shallowed by a factor of 2. Associated with the shallower mixed layer is enhanced phytoplankton carbon fixation. In the north, significant interannual variability resulted in the mixed layer showing no trended change over time and there was no significant increase in the phytoplankton productivity. Associated with the recent increases in sea ice there has been an increase in the photosynthetic efficiency (chlorophyll a-normalized carbon fixation) in the northern and southern regions of the WAP. We hypothesize the increase in sea ice results in increased micronutrient delivery to the continental shelf which in turn leads to enhanced photosynthetic performance.This article is part of the theme issue ‘The marine system of the West Antarctic Peninsula: status and strategy for progress in a region of rapid change’.
机译：在过去的50年中，西南极半岛（WAP）发生了重大变化。使用帕尔默长期生态研究计划收集的24年空间时间序列，我们评估了海冰，上混合层深度（MLD）和浮游植物生产力的长期格局。从1980年代到2008年开始最近的逆转，海冰天数稳步下降。结果显示，在每个南方夏季进行的区域船舶调查中，北部和南部地区之间的区域差异。在WAP南部，上层海洋MLD变浅了2倍。与较浅的混合层相关的是浮游植物的固碳能力增强。在北部，年际变化显着，导致混合层没有随时间变化的趋势，浮游植物的生产力也没有显着提高。与最近海冰增加相关的是，WAP北部和南部地区的光合作用效率（叶绿素a标准化的碳固定）已经增加。我们假设海冰的增加导致微量营养素向大陆架的输送增加，进而导致光合作用增强。本文是主题“西南极半岛海洋系统：海洋生物发展的现状和战略”的一部分快速变化的区域”。

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