Chlorophyll natural fluorescence response to upwelling events in the Southern Ocean
Chlorophyll natural fluorescence response to upwelling events in the Southern Ocean
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DOI：
10.1029/97gl00205
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发表时间：
1997-02
影响因子：
5.2
通讯作者：
Ricardo M Letelier;M. Abbott;D. Karl
中科院分区：
文献类型：
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作者：
Ricardo M Letelier;M. Abbott;D. Karl
使用自由漂浮的漂流器，在位于南极极锋南部的气旋涡流的上层，以数小时至数周的尺度测量太阳引起的（自然）荧光和叶绿素的变化。荧光信号既可以根据叶绿素浓度进行分析，也可以作为光合作用装置中能量分布的指标。荧光的长期趋势与叶绿素浓度的平行变化。考虑到荧光与涡流上层的相对深度之间存在显着的正相关性，我们假设观察到的自然荧光的短期变化是浮游植物对限制营养物供应变化的生理反应。这一解释与南大洋铁限制假说一致。
Variability of solar‐induced (natural) fluorescence and chlorophyll were measured on scales of hours to weeks in the upper layer of a cyclonic eddy located south of the Antarctic Polar Front using a free‐floating drifter. The fluorescence signal was analyzed both in terms of chlorophyll concentration and as an indicator of energy distribution in the photosynthetic apparatus. Long‐term trends in fluorescence parallel changes in chlorophyll concentration. Considering a significant positive correlation between fluorescence and the relative depth of the eddy upper layer we hypothesize that the observed short‐term variations in natural fluorescence are a physiological response of phytoplankton to changes in the supply of limiting nutrients. This interpretation is consistent with the Southern Ocean iron limitation hypothesis.