The Role of Air–Sea Interactions in Atmospheric Rivers: Case Studies Using the SKRIPS Regional Coupled Model
The Role of Air–Sea Interactions in Atmospheric Rivers: Case Studies Using the SKRIPS Regional Coupled Model
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海气相互作用在大气河流中的作用：使用 SKRIPS 区域耦合模型的案例研究
DOI：
10.1029/2020jd032885
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Hoteit, Ibrahim
中科院分区：
文献类型：
--
作者：
Sun, Rui;Subramanian, Aneesh C.;Cornuelle, Bruce D.;Mazloff, Matthew R.;Miller, Arthur J.;Ralph, F. Martin;Seo, Hyodae;Hoteit, Ibrahim
大气河流(ARs)在加州的供水中起着关键作用，是北美西海岸大部分极端降水和重大洪水的罪魁祸首。鉴于ARS的高度社会影响，提高我们对ARS的理解和预测是至关重要的。这项研究使用了一个区域海洋-大气耦合模拟系统，对ARS进行了长达14天的后预报。在比较中突出了两组耦合运行：(1)ARS发生在海面温度(SST)冷却较强的时段；(2)ARS出现在SST冷却较弱的时段。在SST冷却较强的事件期间，耦合模式模拟与ARS相关的强向上的海气热通量，而当SST冷却较弱时，耦合模式模拟AR区的下行海气热通量。验证数据表明，耦合模式巧妙地再现了海温的演变以及海洋和大气之间的地表湍流热传输。通过比较耦合模式后预报和持续海温后预报，研究了海-气相互作用在AR事件中的作用。为了评价海洋对ARS的影响，我们分析了AR强度的两个有代表性的变量，垂直积分水汽(IWV)和积分水汽输送(IVT)。在强SST冷却AR事件期间，在提前时间大于一周的耦合运行中，模拟的IWV改善了约12%。对于IVT，它的变量大约是两倍，耦合运行的改进约为5%。
Atmospheric rivers (ARs) play a key role in California's water supply and are responsible for most of the extreme precipitation and major flooding along the west coast of North America. Given the high societal impact, it is critical to improve our understanding and prediction of ARs. This study uses a regional coupled ocean–atmosphere modeling system to make hindcasts of ARs up to 14 days. Two groups of coupled runs are highlighted in the comparison: (1) ARs occurring during times with strong sea surface temperature (SST) cooling and (2) ARs occurring during times with weak SST cooling. During the events with strong SST cooling, the coupled model simulates strong upward air–sea heat fluxes associated with ARs; on the other hand, when the SST cooling is weak, the coupled model simulates downward air–sea heat fluxes in the AR region. Validation data shows that the coupled model skillfully reproduces the evolving SST, as well as the surface turbulent heat transfers between the ocean and atmosphere. The roles of air–sea interactions in AR events are investigated by comparing coupled model hindcasts to hindcasts made using persistent SST. To evaluate the influence of the ocean on ARs we analyze two representative variables of AR intensity, the vertically integrated water vapor (IWV) and integrated vapor transport (IVT). During strong SST cooling AR events the simulated IWV is improved by about 12% in the coupled run at lead times greater than one week. For IVT, which is about twice more variable, the improvement in the coupled run is about 5%.
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影响因子：
4.6
作者：
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影响因子：
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作者：
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影响因子：
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影响因子：
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影响因子：
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