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首页> 外文会议>International Workshop on Marine Remote Sensing in Northwest Pacific Region; 20041011-12; Beijing(CN) >Temporal and Spatial Variability of Phytoplankton Pigment Concentrations in the East/Japan
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Temporal and Spatial Variability of Phytoplankton Pigment Concentrations in the East/Japan

机译：东部/日本浮游植物色素浓度的时空变化

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摘要

Temporal and spatial variability of phytoplankton pigment concentrations in the East/Japan Sea was described, using monthly mean composite images derived from ocean color data and surface mixed layer ecosystem model. The pigment concentrations in the East/Japan Sea show remarkable seasonal variations. The two blooms of the year appear in spring and fall. The spring bloom in the southern areas (April) occurs one month in advance in comparison with that in the northern areas (May). Fall bloom appears in November and December when mixed layer depth (MLD) becomes equal to critical depth. The fall bloom can be explained by deepening of MLD in the Japan Sea. The pigment concentrations in winter are higher than that in summer. The low pigment concentrations dominate in summer. Seasonal variability of phytoplankton was investigated with surface mixed layer ecosystem model in the East/Japan Sea. The model consisted of four compartments (phytoplankton, zooplankton, nutrient, detritus) forced by mixed layer depths, photosynthetically available radiation and nutrient concentrations. From results we estimated entrainment rate 2.5-4.0 m/day to reproduce the two annual blooms, and reproduced seasonal variation of phytoplankton at southern and northern regions by the difference of surface winter MLD using the entrainment rate value 3.0 m/day. The spring blooms in the southern and northern regions closely related to deepening of a winter surface MLD. In the southern region where MLD was shallow and phytoplankton spring bloom occurs one month in advance to the northern region where MLD was deep. The amount of light increases within the MLD during the onset of stratification and water temperature increases faster in spring in the southern region than the northern region. Decrease of phytoplankton was mainly affected by zooplankton grazing in the southern region and by nutrient exhaustion in the northern region. The fall bloom in the two regions was caused by the nutrient availability and entrainment on the phytoplankton.
机译：利用从海洋颜色数据和表面混合层生态系统模型获得的月平均合成图像，描述了东/日本海中浮游植物色素浓度的时空变化。东日本海的色素浓度表现出明显的季节性变化。一年中的两次大花盛开在春天和秋天。南部地区（4月）的春季开花比北部地区（5月）提前一个月。当混合层深度（MLD）等于临界深度时，秋天绽放出现在11月和12月。可以通过日本海MLD的加深来解释秋季开花。冬季的色素含量高于夏季。夏季低颜料浓度占主导。利用东/日本海的表面混合层生态系统模型研究了浮游植物的季节性变化。该模型由四个层（浮游植物，浮游动物，营养物，碎屑）组成，这些空间受混合层深度，光合有效辐射和营养物浓度的强迫。根据结果​​，我们估算出夹带速率为2.5-4.0 m / day，以重现两次年度开花，并利用夹带速率值为3.0 m / day，通过地表冬季MLD的差异，重现了南部和北部地区浮游植物的季节性变化。春季开花的南部和北部地区与冬季表面MLD的加深密切相关。在MLD较浅而浮游植物南部的地区比MLD较深的北部地区提前一个月出现水华。在分层开始期间，MLD内的光量增加，并且南部地区春季的水温升高快于北部地区。浮游植物的减少主要受到南部地区浮游动物放牧和北部地区养分消耗的影响。这两个地区的秋季开花是由于养分的可利用性和浮游植物的夹带引起的。

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