Implications of bio‐optical modeling of phytoplankton photosynthesis in Antarctic waters: Further evidence of no light limitation in the Bransfield Strait
Implications of bio‐optical modeling of phytoplankton photosynthesis in Antarctic waters: Further evidence of no light limitation in the Bransfield Strait
复制标题
南极水域浮游植物光合作用生物光学模型的意义：布兰斯菲尔德海峡没有光限制的进一步证据
DOI：
10.4319/lo.1999.44.7.1599
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. Estrada
中科院分区：
文献类型：
--
作者：
F. G. Figueiras;B. Arbones;M. Estrada
在ECOANTAR 94巡航期间，确定了布兰斯菲尔德海峡东部以及威德尔海和威德尔-斯科舍汇流周边地区的光合作用与辐照度关系、浮游植物光谱吸收、碳固定量子产率和水柱光状况，以确定这些地区的光合作用是否受光限制。不同水团的光饱和叶绿素比光合速率（P Bm）、光限斜率（±B）、光饱和参数（EkPAR）和最大量子产额（Φm）在表层和次表层水之间均无显著差异，表明上层混合层的光合响应是一致的。光谱光饱和度参数（EkPUR）和上混合层浮游植物平均吸收辐照度（EumlPUR）之间也没有显著差异。这些相似之处表明，浮游植物光合作用是没有光限制在这个南极地区在巡航期间。水柱的平均操作量子产率（0.03 mol C [mol photons]-1）是平均最大量子产率（0.06 mol C [mol photons]-1）的一半，这一事实也证实了这一点。当宽带模型与光谱模型相比时，初级生产被低估了24%。这些结果对南大洋碳流的建模具有重要意义。
During the cruise ECOANTAR 94 photosynthesis versus irradiance relationships, phytoplankton spectral absorption, quantum yield of carbon fixation, and water column light regime were determined in the eastern Bransfield Strait and surrounding areas of the Weddell Sea and Weddell‐Scotia Confluence, to determine if photosynthesis is light limited in these areas. There were no significant differences in the light‐saturated chlorophyll‐specific rate of photosynthesis (P Bm), light‐limited slope (±B), light saturation parameter (EkPAR), and the maximum quantum yield (Φm) between surface and subsurface water for several water masses in the area, which indicates that the photosynthetic response in the upper mixed layer was uniform. There were also no significant differences between the spectral light saturation parameter (EkPUR) and the mean absorbed irradiance by phytoplankton in the upper mixed layer (EumlPUR). These similarities suggest that phytoplankton photosynthesis was not light limited in this Antarctic region during the cruise period. This was also affirmed by the fact that the average operational quantum yield of the water column (0.03 mol C [mol photons]−1) was half of the mean maximum quantum yield (0.06 mol C [mol photons]−1). Primary production is underestimated by 24% when broadband models are compared with spectral ones. These results have important implications for the modeling of carbon flows in the Southern Ocean.