Diatom Hotspots Driven by Western Boundary Current Instability
Diatom Hotspots Driven by Western Boundary Current Instability
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DOI：
10.1029/2020gl091943
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发表时间：
2021-06-16
影响因子：
5.2
通讯作者：
McGillicuddy, Dennis J. Jr Jr
中科院分区：
文献类型：
--
作者：
Oliver, Hilde;Zhang, Weifeng G.;McGillicuddy, Dennis J. Jr Jr
气候变化降低了墨西哥湾流（GS）的稳定性，增加了其曲流与中大西洋湾（MAB）大陆架和斜坡区相互作用的频率。这些入侵被认为通过将低营养水输送到原本高产的陆架边缘区域来抑制生物生产力。在这里，我们提供了MAB斜坡海中广泛存在异常强烈的地下硅藻热点的证据，这可能是由2019年7月的GS入侵造成的。热点（约50米）与GS水（约100米）的水质量特征有关；热点很可能是由GS水在进入斜坡海的过程中上涌造成的，可能是由GS蜿蜒直接侵入热点观测到的东部大陆斜坡造成的。需要进一步的工作来揭示日益频繁的GS直接入侵如何影响MAB海洋生态系统。
Climatic changes have decreased the stability of the Gulf Stream (GS), increasing the frequency at which its meanders interact with the Mid-Atlantic Bight (MAB) continental shelf and slope region. These intrusions are thought to suppress biological productivity by transporting low-nutrient water to the otherwise productive shelf edge region. Here we present evidence of widespread, anomalously intense subsurface diatom hotspots in the MAB slope sea that likely resulted from a GS intrusion in July 2019. The hotspots (at similar to 50 m) were associated with water mass properties characteristic of GS water (similar to 100 m); it is probable that the hotspots resulted from the upwelling of GS water during its transport into the slope sea, likely by a GS meander directly intruding onto the continental slope east of where the hotspots were observed. Further work is required to unravel how increasingly frequent direct GS intrusions could influence MAB marine ecosystems.