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黄海是亚洲沙尘暴频繁侵袭的地区,沉降的沙尘可以为该海域的浮游植物提供营养盐,促进该海域浮游植物的生长,从而对该海域的初级生产力以及碳存储等产生影响。本文利用Himawari-8卫星遥感数据,结合WRF-Chem和HYSPLIT模式,研究了2018年3月20日～4月13日期间四次沙尘事件的传输过程及其对南黄海中心(SYC)海域叶绿素a浓度的影响。结果表明,研究期内沙尘气溶胶从蒙古戈壁经过不同的传输路径到达SYC海域,在沙尘沉降事件发生后的2～8 d,SYC海域的叶绿素a浓度出现了不同程度的增加,且其峰值均超过了藻华阈值(2.15 mg·m-3),有些甚至高达11.6 mg·m-3。相比传输路径,叶绿素a浓度的变化受沙尘沉降量的影响更大。多数情况下,在一次沙尘过程中,SYC海域的沙尘沉降量越多,叶绿素a浓度的增长幅度越大;单日沉降量越大,叶绿素a浓度变化的响应时间越短。
Abstract：The Yellow Sea is an area frequently attacked by duststorms in Asia. The sediment dust can provide nutrients to the phytoplankton in the sea, promote the growth of phytoplankton in this area, and thus affect the primary productivity and carbon storage of this area. Based on the remote sensing data of himawari-8 satellite, combined with WRF Chem and hysplit model, the transport process of four dust event and its impact on the concentration of chlorophyll a in the central area of the South Yellow Sea(SYC) from March 20 to April 13, 2018 were studied. The results show that during the study period, dust aerosols arrived at SYC sea area through different transport paths from the Mongolian Gobi. The results show that during the study period, the dust aerosols from the Mongolian Gobi through different transmission paths to the SYC sea area, the Chlorophyll a concentration in the SYC sea area increased to varying degrees 2～8 d after the occurrence of dust deposition events, and its peak value exceeded the algal bloom threshold(2.15 mg·m-3), some even reached 11.6 mg·m-2. Compared with the transport path, the change of chlorophyll a concentration is more affected by the amount of dust deposition. In most cases, in a single dust process, the more the dust deposition in the SYC, the greater the increase of Chlorophyll a concentration; the greater the settlement per day, the shorter the response time of Chlorophyll a concentration change.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20190423
中图分类号:Q948;P425.55;P736.2
引用信息:
[1]张莉燕,王文彩,罗诚汉,等.沙尘传输路径和沉降量对南黄海叶绿素a浓度的影响[J],2020,50(08):9-18.DOI:10.16441/j.cnki.hdxb.20190423.
基金信息:
国家自然科学基金项目(41875174,41505013)资助~~