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首页> 外文期刊>Estuarine Coastal and Shelf Science >Evolution of satellite derived chlorophyll-a trends in the Bohai and Yellow Seas during 2002-2018: Comparison between linear and nonlinear trends
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Evolution of satellite derived chlorophyll-a trends in the Bohai and Yellow Seas during 2002-2018: Comparison between linear and nonlinear trends

机译：2002 - 2018年渤海和黄海脉绿叶绿素衍生叶绿素的演变：线性和非线性趋势之间的比较

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摘要

The trends of sea surface chlorophyll-a (Chl-a) concentrations in the Bohai and Yellow Seas of China (BYS) were analysed based on the satellite-derived Chl-a dataset from August 2002 to December 2018. The result of linear trend analysis based on the seasonal Mann-Kendall test indicates a significant positive Chl-a trend during this period, with an average trend of similar to 1.15% year 1 (Slope: similar to 0.011 mg year 1). However, the linear trends of Chl-a varied seasonally, with strong and significant increases in spring and summer (about 2% year(-1)), and weak and non-significant increases in winter (lower than 1% year(-1)). The results of the ensemble empirical mode decomposition (EEMD) analysis revealed highly nonlinear and time-varying trends of Chl-a in the BYS, with gradually increased Chl-a during 2002-2011 and decreased Chl-a from 2012 to 2018. The instantaneous rate of Chl-a change was continuously reduced from 2002 to 2018, from a positive value of -2.0% year 1 around the beginning year (2002) to a negative value of approximately 2.0% year 1 around the recent year (2018). The temporal evolution of the Chl-a trend was well in accordance with the changes in nutrient enrichment, suggesting that the status of eutrophication might be the primary driver of the long-term trends in Chl-a. The increase (decrease) in nutrient levels could alleviate (aggravate) the nutrient limitation for phytoplankton growth in spring and summer, thus regulating the changes in Chl-a. In contrast, the Chl-a trend seems to be unrelated to the trend of light intensity in this area. This is the first study aimed to discern and compare the linear and evolutionary nonlinear Chl-a trends in the BYS and provides a baseline against which future changes can be monitored.
机译：从2002年8月到2018年8月，基于卫星衍生的CHL-A数据集分析了中国渤海和黄海（BESS）的海面叶绿素-A（CHL-A）浓度的趋势。线性趋势分析的结果基于季节性Mann-Kendall测试表明这一时期的显着阳性趋势，平均趋势与1.15％的1（斜坡：类似于0.011毫克）。然而，CHL-A的线性趋势季节性态度，春季和夏季强大而显着增加（约2％（-1）），冬季疲软和非显着增加（低于1％（-1） ）））。集合经验模式分解（EEMD）分析的结果揭示了CHL-A中的高度非线性和时变趋势，2002 - 2011年期间CHL-A逐渐增加，从2012年到2018年下降了CHL-A.瞬间CHL-A的率从2002年到2018年持续减少，从开始年份（2002年）的正价为-2.0％的阳性价值在近年来的负值约为2.0％（2018年）。 CHL-A趋势的时间演变符合营养丰富的变化，旨在富营养化的状态可能是CHL-A的长期趋势的主要驾驶员。营养水平的增加（减少）可以缓解（加重）春季和夏季植物生长的营养限制，从而调节CHL-A的变化。相比之下，CHL-A趋势似乎与该地区光强度的趋势无关。这是第一项研究旨在辨别并比较线性和进化非线性CHL-A趋势的趋势，并提供了可以监控未来更改的基线。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2021年第30期|107449.1-107449.17|共17页
  • 作者

    Wang Yueqi; Tian Xinpeng; Gao Zhiqiang;

  • 作者单位

    Chinese Acad Sci Yantai Inst Coastal Zone Res CAS Key Lab Coastal Environm Proc & Ecol Remedit Yantai 264003 Peoples R China|Chinese Acad Sci Yantai Inst Coastal Zone Res Shandong Key Lab Coastal Environm Proc Yantai 264003 Peoples R China|Chinese Acad Sci Ctr Ocean Mega Sci Qingdao 266071 Peoples R China;

    Chinese Acad Sci Yantai Inst Coastal Zone Res CAS Key Lab Coastal Environm Proc & Ecol Remedit Yantai 264003 Peoples R China|Chinese Acad Sci Yantai Inst Coastal Zone Res Shandong Key Lab Coastal Environm Proc Yantai 264003 Peoples R China|Chinese Acad Sci Ctr Ocean Mega Sci Qingdao 266071 Peoples R China;

    Chinese Acad Sci Yantai Inst Coastal Zone Res CAS Key Lab Coastal Environm Proc & Ecol Remedit Yantai 264003 Peoples R China|Chinese Acad Sci Yantai Inst Coastal Zone Res Shandong Key Lab Coastal Environm Proc Yantai 264003 Peoples R China|Chinese Acad Sci Ctr Ocean Mega Sci Qingdao 266071 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Long-term Chl-a trend; Linear and nonlinear; The Bohai and Yellow seas; Remote sensing; Eutrophication;

    机译：长期chl-a趋势;线性和非线性;渤海和黄海;遥感;富营养化;

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