Monsoon-forced chlorophyll distribution and primary production in the South China Sea: observations and a numerical study
Monsoon-forced chlorophyll distribution and primary production in the South China Sea: observations and a numerical study
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DOI：
10.1016/s0967-0637(02)00035-3
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发表时间：
2002-08-01
影响因子：
2.4
通讯作者：
Tang, TY
中科院分区：
文献类型：
--
作者：
Liu, KK;Chao, SY;Tang, TY
尽管南中国海（SCS）不断与菲律宾西部的水交换水，但其营养线很浅，地表水中的叶绿素水平的高度是高的两倍。 CZCS-SEAWIFS数据和船上数据的分析表明，在三个上升地区，SCS的叶绿素季节性很强。开发了具有耦合物理和生物地球化学的三维数值模型，以研究季风强迫对SCS中营养升高和浮游植物生长的影响。该模型的水平分辨率为0.4度，在域2-24.8级和99-124.6级，垂直方向为21层。循环由每月气候风驱动。基于氮的生态系统模型具有四个隔室：溶解的无机氮（DIN），浮游植物，浮游动物和碎屑。叶绿素与粉状的比例取决于光和DIN的可用性。生物方程式和参数取自Sargasso Sea的先前建模研究。该模型模拟了硝酸盐剖面，强的地下叶绿素最大值和中央盆地的主要产量，并取得了合理的成功。它还在冬季和夏季在越南东海岸附近的吕宋岛西北部和桑代货架以北的季风驱动的上升地区产生浓郁的叶绿素斑块。结果与船上观测和CZCS-SEAWIFS数据是合理的一致性。来自SEAWIFS数据的主要产量显示，冬季的高峰和夏季较弱的峰值，整个盆地的年平均值为354 mg C M（-2）D（-1）。建模的一级生产显示的季节性变化类似于SeaWifs数据衍生的趋势，但是幅度（280 mg C M（-2）D（-1））较小20％。该模型还预测，在一个肿区的主要产量中的出口分数为12％。 （c）2002 Elsevier Science Ltd.保留所有权利。
Although the South China Sea (SCS) exchanges water constantly with the western Philippine Sea, its nutricline is much shallower and its chlorophyll level in surface waters is twice as high. Analysis of CZCS-SeaWiFS data and shipboard data reveals a strong seasonality of chlorophyll in the SCS in three upwelling regions. A three-dimensional numerical model with coupled physics and biogeochemistry is developed to study the effect of monsoonal forcing on nutrient upwelling and phytoplankton growth in the SCS. The model has a horizontal resolution of 0.4degrees in the domain 2-24.8degreesN and 99-124.6degreesE and 21 layers in the vertical. The circulation is driven by monthly climatological winds. The nitrogen-based ecosystem model has four compartments: dissolved inorganic nitrogen (DIN), phytoplankton, zooplankton and detritus. The chlorophyll-to-phytoplankton ratio depends on light and DIN availability. The biological equations and parameters are taken from previous modeling studies of the Sargasso Sea. The model simulates the nitrate profile, the strong subsurface chlorophyll maximum, and the primary production in the central basin with reasonable success. It also generates intense chlorophyll patches in the monsoon-driven upwelling regions northwest of Luzon and north of the Sunda Shelf in winter and off the east coast of Vietnam in summer. The results are in reasonable agreement with shipboard observations and CZCS-SeaWiFS data. The primary production derived from SeaWiFS data shows a strong peak in winter and weak peak in summer with an annual mean of 354 mg C m(-2) d(-1) for the whole basin. The modeled primary production displays seasonal variation resembling the trend derived from SeaWiFS data, but the magnitude (280 mg C m(-2) d(-1)) is smaller by 20%. The model also predicts an export fraction of 12% from the primary production in the euphotic zone. (C) 2002 Elsevier Science Ltd. All rights reserved.