Water conservancy project on the Yellow River modifies the seasonal variation of Chlorophyll-a in the Bohai Sea
Water conservancy project on the Yellow River modifies the seasonal variation of Chlorophyll-a in the Bohai Sea
复制标题
黄河水利工程改变了渤海叶绿素a的季节变化
DOI：
10.1016/j.chemosphere.2020.126846
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发表时间：
2020-09-01
期刊：
影响因子：
8.8
通讯作者：
Gao, Huiwang
中科院分区：
文献类型：
--
作者：
Ding, Xiaokun;Guo, Xinyu;Gao, Huiwang
黄河调水调沙工程是我国自2002年以来为减少水库泥沙淤积、提高黄河防洪能力而实施的一项独特的工程措施。作为副作用，WSRS极大地增加了夏季渤海（BHS）的每月营养盐输入通量，可能会加剧渤海的富营养化水平，从而影响浮游植物的生长。然而，它对BHS上叶绿素a（Chl-a）动态的影响仍然知之甚少。本研究采用了两种方法：1）利用2002年前后的地表叶绿素a的长期原位观测和卫星遥感资料，研究了其季节变化; 2）建立了一维物理-生物耦合模式，研究了WSRS对季节性叶绿素a的影响。结果表明：2002年以前，表层叶绿素a在春季和秋季都有两个峰值，而2002年以后，表层叶绿素a在春季和夏季只有一个峰值。2002年以来春夏季节的卫星叶绿素a浓度比2002年前增加了56%。模拟结果表明，自2002年以来，由于WSRS引起的黄河流量变化，导致渤海中部海域夏季出现高浓度的Chl-a。与2002年相比，WSRS使河流营养盐增加的Chl-a占总Chl-a的比例增加了19%。总体而言，WSRS对渤海Chl-a的季节循环有较大影响，其副作用需要考虑。(C)2020爱思唯尔有限公司保留所有权利。
The Water Sediment Regulation Scheme (WSRS) is a unique engineering measure that has been regularly performed to reduce reservoir sedimentation and increase the flood capacity of the Yellow River in China since 2002. As a side effect, the WSRS greatly increases the monthly input flux of nutrients to the Bohai Sea (BHS) in summer, potentially exacerbating eutrophication levels therein and subsequently affecting the growth of phytoplankton. However, its influence on the Chlorophyll-a (Chl-a) dynamics over the BHS is still poorly understood. In this study, two approaches were adopted to investigate it: 1) long-term in-situ observations and satellite-derived data of surface Chl-a were used to study its seasonal variations before and since 2002, and 2) one 1D physical-biological coupled model was developed to evaluate the impact of WSRS on seasonal Chl-a. The results showed that the surface Chl-a exhibited two peaks in spring and autumn until 2002, but has exhibited only one peak in spring-summer since 2002. Satellite-derived Chl-a concentrations in spring-summer since 2002 have increased by 56% compared to those until 2002. The simulated results showed that the change in Yellow River discharge induced by the WSRS has resulted in the appearance of high concentrations of Chl-a in summer over the Central Bohai Sea since 2002. The WSRS increased the ratio of added Chl-a owing to the riverine nutrients to total Chl-a by 19% compared to that until 2002. Overall, WSRS greatly affects the seasonal cycling of Chl-a in the Bohai Sea, and the side effect needs to be considered. (C) 2020 Elsevier Ltd. All rights reserved.