Intrastorm Variability of the Inland and Orographic Enhancement of a Sea-Effect Snowstorm in the Hokuriku Region of Japan

Intrastorm Variability of the Inland and Orographic Enhancement of a Sea-Effect Snowstorm in the Hokuriku Region of Japan
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日本北陆地区海效暴风雪的内陆暴雨内变率和地形增强

DOI:
10.1175/mwr-d-19-0390.1
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发表时间:
2020
影响因子:
3.2
通讯作者:
Yamaguchi, Satoru
Yamaguchi, Satoru
中科院分区:
地球科学2区
文献类型:
--
作者:
Veals, Peter G.;Steenburgh, W. James;Nakai, Sento;Yamaguchi, Satoru

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2010年2月2日至7日,一段长时间的冬季季风流给日本本州岛西海岸的北陆地区沿着带来了严重的海洋效应降雪。一些地区的降雪量超过140厘米,但事件中的分布变化很大。我们使用日本气象厅(JMA)的C波段监视雷达,JMA探测,地面降水观测和天气研究和预报(WRF)模型模拟的数据来研究这些变化的因素。事件发生期间有三个不同的时期。第1阶段的特点是水流相对较弱,降水主要集中在沿海和低地。降水最大值位于气流上升的地方:1)在地形阻塞的空气中,2)在一个高流量正常障碍的脚下,或3)在较低的山脉相对畅通无阻。流量加强期间2,产生更强的垂直速度的地形与降水最大值转移到内陆和更高的海拔。在第3阶段,气流进一步加强,降水最大值在海拔较高的地方移动,进入背风面,低地几乎没有降水。因此,更大的内陆渗透和降水增强发生的流速增加,但其他因素,如云下升华的水凝物和对流不稳定也有助于期间2和3之间的差异。这些结果说明了入射流强度在调节全球湖泊和海洋效应区域降雪分布和增强中的重要性。
A prolonged period of winter monsoonal flow brought heavy sea-effect snowfall to the Hokuriku region along the west coast of the Japanese island of Honshu from 2 to 7 February 2010. Snowfall in some locations exceeded 140 cm, but the distribution within the event was highly variable. We examine the factors contributing to these variations using data from a Japan Meteorological Agency (JMA) C-band surveillance radar, JMA soundings, surface precipitation observations, and a Weather Research and Forecasting (WRF) Model simulation. There were three distinct periods during the event. Period 1 featured relatively weak flow with precipitation confined mainly to the coast and lowlands. Precipitation maxima were located where the flow ascended: 1) over terrain-blocked air, 2) at the foot of a high flow-normal barrier, or 3) relatively unimpeded over the lower mountain ranges. Flow strengthened during period 2, yielding stronger vertical velocities over the terrain with precipitation maxima shifting inland and to higher elevation. The flow strengthened further in period 3, with the precipitation maxima shifting higher in elevation and into the lee, with almost no precipitation falling in the lowlands. Thus, greater inland penetration and enhancement of precipitation occurred as the flow speed increased, but additional factors such as the subcloud sublimation of hydrometeors and the convective instability also contribute to differences between periods 2 and 3. These results illustrate the importance of incident flow strength in modulating the distribution and enhancement of snowfall in global lake- and sea-effect regions.
DOI: 10.1029/2018jd029586
发表时间: 2019
期刊: Journal of Geophysical Research: Atmospheres
影响因子: --
作者:
West, Tyler K.;Steenburgh, W. James;Mace, Gerald G.
通讯作者: Mace, Gerald G.
DOI: 10.2151/jmsj1965.70.1_57
发表时间: 1992
影响因子: 3.1
作者:
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通讯作者: Misao Satol
DOI: 10.1002/qj.544
发表时间: 2010
影响因子: 8.9
作者:
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通讯作者: U. Germann
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DOI: --
发表时间: 2003
期刊:
影响因子: --
作者:
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通讯作者: W. J. Steenburgh
DOI: 10.1146/annurev.fl.19.010187.000451
发表时间: 1987
影响因子: 27.7
作者:
P. Baines
通讯作者: P. Baines