The great Atlantic Sargassum belt

The great Atlantic Sargassum belt
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DOI:
10.1126/science.aaw7912
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发表时间:
2019-07-05
期刊:
影响因子:
56.9
通讯作者:
Montoya, Joseph P.
Montoya, Joseph P.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang, Mengqiu;Hu, Chuanmin;Montoya, Joseph P.

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马尾藻在马尾藻海中大量存在,但自2011年以来,在卫星图像中观测到一个反复出现的大西洋马尾藻大带(GASB),它经常从西非延伸到墨西哥湾。2018年6月,这个长达8850公里的大西洋马尾藻大带包含超过2000万公吨的马尾藻生物量。大西洋马尾藻大带的空间分布主要受海洋环流驱动。2011年的藻华可能是前几年亚马逊河流量的结果,但2011年之后近期的增长和年际变化似乎是由北半球冬季西非的上升流以及春季和夏季亚马逊河的流量所驱动,这表明可能出现了一种状态转变,并增加了热带大西洋和加勒比海反复出现藻华可能成为新常态的可能性。
Pelagic Sargassum is abundant in the Sargasso Sea, but a recurrent great Atlantic Sargassum belt (GASB) has been observed in satellite imagery since 2011, often extending from West Africa to the Gulf of Mexico. In June 2018, the 8850-kilometer GASB contained > 20 million metric tons of Sargassum biomass. The spatial distribution of the GASB is mostly driven by ocean circulation. The bloom of 2011 might be a result of Amazon River discharge in previous years, but recent increases and interannual variability after 2011 appear to be driven by upwelling off West Africa during boreal winter and by Amazon River discharge during spring and summer, indicating a possible regime shift and raising the possibility that recurrent blooms in the tropical Atlantic and Caribbean Sea may become the new norm.