Sensitivity of Midlatitude Heavy Precipitation to SST: A Case Study in the Sea of Japan Area on 9 August 2013
Sensitivity of Midlatitude Heavy Precipitation to SST: A Case Study in the Sea of Japan Area on 9 August 2013
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DOI：
10.1029/2018jd029503
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
S. Iizuka;H. Nakamura
中科院分区：
文献类型：
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作者：
S. Iizuka;H. Nakamura
本研究调查了2013年8月9日日本最大岛屿北方地区（北方东北地区）强降水事件发生时日本海海面温度（SST）的影响。使用天气研究和预报模型进行的敏感性实验表明，模拟中规定的日本海SST较暖（较冷）导致东北北方地区平均24小时降水量增加（减少），特别是日本海（即，迎风）侧。虽然没有显着的关系被发现之间的本地最大值和SST在日本海，这些SST值在日本海影响强对流降水的演变;较高（较低）的SST的行为转移的位置强降水的上风（下风）侧在本事件。不同的演变导致不同的相互作用与下游地形，导致强降水和SST的本地最大值之间没有显着的关系。这种差异源于对流上升气流对海温的敏感性。因此，模拟表明，目前可用的SST产品的不确定性可能会改变区域平均降水量和强降水的地理位置，这可能会影响山洪暴发和山体滑坡警报。
This study investigates the influence of sea surface temperature (SST) over the Sea of Japan on a heavy precipitation event that occurred over the northern part (Northern Tohoku region) of Japan's largest island on 9 August 2013. Sensitivity experiments with the Weather Research and Forecasting model show that warmer (cooler) SSTs prescribed over the Sea of Japan in the simulations lead to an increase (decrease) in 24‐hr precipitation averaged within the Northern Tohoku region, especially on the Sea of Japan (i.e., windward) side. Though no significant relationship is found between the local maxima and SSTs over the Sea of Japan, those SST values over the Sea of Japan affect the evolution of the intense convective precipitation; higher (lower) SSTs act to shift the location of intense precipitation on the upwind (downwind) side in the present event. The different evolution results in a different interaction with the downstream orography, leading to no significant relationship between the local maxima of intense precipitation and SSTs. The differences arise from the sensitivity of convective updraft to SSTs. The simulations thus suggest that uncertainties in currently available SST products may alter both the area‐averaged precipitation and the geographical locations of intense precipitation, which can potentially impact flash flood and landslide warnings.