Rain triggers seasonal stratification in a temperate shelf sea.
Rain triggers seasonal stratification in a temperate shelf sea.
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DOI：
10.1038/s41467-023-38599-y
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发表时间：
2023-06-02
影响因子：
16.6
通讯作者：
Wihsgott, J.
中科院分区：
文献类型：
--
作者：
Jardine, J. E.;Palmer, M.;Mahaffey, C.;Holt, J.;Wakelin, S. L.;Dusterhus, A.;Sharples, J.;Wihsgott, J.
北大西洋风暴路径充当温带气旋的传送带，经常给欧洲西北部陆架海带来强风和降雨。由于风驱动的混合抵消了热浮力，风暴主要被认为对陆架海分层有害，但它们对陆架规模分层循环的影响仍然知之甚少。在这里，我们表明风暴通过降雨增强表面浮力来引发分层。一个多年代际模型证实，从 1982 年到 2015 年，88% 的时间里，降雨触发了季节性分层。分层可能会受到大规模气候振荡的进一步调节，例如大西洋多年代际变率 (AMV)，在正 AMV 阶段，分层开始日期的变化是负 AMV 阶段的两倍。除了目前增加风驱动混合的观点之外，还进一步讨论了不断变化的风暴活动将如何影响陆架海，这对海洋生产力和生态系统功能具有重大影响。研究发现，欧洲西北部大陆架的季节性分层是由经过的风暴带来的降雨引发的。分层的开始与北大西洋大规模压力变化之间存在进一步的联系。
The North Atlantic Storm Track acts as a conveyor belt for extratropical cyclones that frequently deliver high winds and rainfall to northwest European shelf seas. Storms are primarily considered detrimental to shelf sea stratification due to wind-driven mixing countering thermal buoyancy, but their impact on shelf scale stratification cycles remains poorly understood. Here, we show that storms trigger stratification through enhanced surface buoyancy from rainfall. A multidecadal model confirms that rainfall contributed to triggering seasonal stratification 88% of the time from 1982 to 2015. Stratification could be further modulated by large-scale climate oscillations, such as the Atlantic Multidecadal Variability (AMV), with stratification onset dates being twice as variable during a positive AMV phase than a negative one. Further insights into how changing storm activity will impact shelf seas are discussed beyond the current view of increasing wind-driven mixing, with significant implications for marine productivity and ecosystem function. Seasonal stratification on the northwest European Shelf is found to be triggered by rainfall from passing storms. Further links are made between the onset of stratification to large-scale pressure changes in the North Atlantic.
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影响因子：
3.3
作者：
Franks, Peter J. S.
通讯作者：
Franks, Peter J. S.
影响因子：
2.8
作者：
Ingleby, Bruce;Huddleston, Matt
通讯作者：
Huddleston, Matt
影响因子：
6.7
作者：
Bene, Christophe;Barange, Manuel;Williams, Meryl
通讯作者：
Williams, Meryl
DOI：
10.1073/pnas.0805801106
发表时间：
2009-04-14
影响因子：
11.1
作者：
Coma, Rafel;Ribes, Marta;Pascual, Josep
通讯作者：
Pascual, Josep
影响因子：
3.6
作者：
Fairall, CW;Bradley, EF;Young, GS
通讯作者：
Young, GS