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Reappraisal of meridional differences of factors controlling phytoplankton biomass and initial increase preceding seasonal bloom in the northwestern Pacific Ocean

机译:重新评估西北太平洋海洋浮游生物量控制因子和子季开花前的初始增加的子午线差异

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摘要

Multiplatform observations of ocean biogeochemical data were used to elucidate meridional differences in the factors that limit phytoplankton biomass (Chl-a) and the mechanisms that trigger the seasonal winter or spring phytoplankton bloomin the northwestern Pacific Ocean (NWPO). During the winter, Chl-a north (south) of 30°N is limited by light (nutrients). During the spring and fall, Chl-a in much of the area east of the Japan/Kuril Islands and/or north of 40°N(south of 35°N) is limited by light (nutrients). During the summer, nutrients limit Chl-a over much of the NWPO, except in the areas east of the Japan/Kuril Islands and north of 45°N. In the area south of around 31°N, phytoplankton biomass is nutrient limited throughout the year, and the seasonal bloom emerges in the winter, begins in the fall which is associated with mixed layer deepening. Between 31°N and 40°N, the spring bloom onset is mainly associated with a cessation of mixed layer deepening. In much of the area north of 40°N, including the Oyashio area, the onset of the spring bloom is consistent with Sverdrup’s critical depth hypothesis. The spatial extents of the light- and nutrient-limited areas and the areas associated with a single bloom onset mechanism are by no means constant. They are expected to undergo meridional shifts as a result of large-scale climatic changes and global warming.
机译:利用海洋生物地球化学数据的多平台观测来阐明子午线差异,这些差异在限制浮游植物生物量的因素(Chl-a)以及触发西北太平洋冬季或春季浮游植物开花的机理上(NWPO)。在冬季,南北30度(南北)受到光照(营养素)的限制。在春季和秋季,日本/千岛群岛以东和/或北纬40°N(南北35°N)大部分地区的Chl-a受到光(营养素)的限制。在夏季,除了日本/千岛群岛以东和北纬45°以北的地区,营养物质限制了西北太平洋大部分地区的Chl-a。在约31°N以南的地区,浮游植物的生物量全年营养有限,季节性开花在冬季出现,从秋天开始,这与混合层加深有关。在31°N到40°N之间,春季开花开始主要与混合层加深的停止有关。在40°N以北的大部分地区,包括Oyashio地区,春季开花的发生与Sverdrup的临界深度假说相符。受光和营养限制的区域以及与单一开花开始机制相关的区域的空间范围决不是恒定的。由于大规模的气候变化和全球变暖,预计它们将发生子午线变化。

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