Warming and drying over the central Himalaya caused by an amplification of local mountain circulation
Warming and drying over the central Himalaya caused by an amplification of local mountain circulation
复制标题
局部山地环流增强导致喜马拉雅山中部变暖和干燥
DOI：
10.1038/s41612-019-0105-5
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发表时间：
2020
影响因子：
9
通讯作者：
F. Cannon
中科院分区：
文献类型：
--
作者：
J. Norris;L. Carvalho;Charles Jones;F. Cannon
喜马拉雅山脉中部的气候变化对下游地区的水资源至关重要，那里有数亿人生活。近几十年来，这一地区的变暖和变干都发生了，但相关的气象因素很难根据分布不均匀的气象站的观测、再分析和全球气候模式来诊断，这些模式很难再现地形的日循环。在这里，最近的趋势，在喜马拉雅山脉中部的夏季日周期进行了研究，使用36年的高分辨率动态降尺度。我们说明了对比的趋势，在喜马拉雅山上空的环流和对流的日周期。在白天，斜坡的变暖增强了上坡风。到了晚上，晴朗的天空辐射冷却了山坡，增强了下坡风。增强的上坡风阻止了白天山区的任何干燥，而增强的下坡风则与高海拔地区的夜间干燥有关。这种日周期的放大对于预测该地区复杂地形的未来水文气候至关重要。
Climatic changes over the central Himalaya are critical for water resources in downstream regions where hundreds of millions of people live. Warming and drying in this region have both occurred in recent decades, but the associated meteorological factors are difficult to diagnose based on observations from unevenly distributed weather stations, reanalyses, and global climate models that poorly reproduce the orographic diurnal cycle. Here, recent trends in the summer diurnal cycle over the central Himalaya are investigated using a 36-year high-resolution dynamical downscaling. We illustrate contrasting trends over the diurnal cycle of circulation and convection over the Himalaya. In the daytime, warming of the slopes has enhanced anabatic upslope winds. At night, clearer skies have radiatively cooled the slopes, enhancing katabatic downslope winds. The enhanced upslope winds have prevented any drying over the mountains in the daytime, while the enhanced downslope winds are associated with significant nocturnal drying at high elevations. This amplification in the diurnal cycle is critical for projecting the future hydroclimate over the region’s complex terrain.
DOI：
10.1002/2017jd027414
发表时间：
2017-12
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
T. Mölg;F. Maussion;E. Collier;J. Chiang;D. Scherer
通讯作者：
T. Mölg;F. Maussion;E. Collier;J. Chiang;D. Scherer
喜马拉雅冰川对受碎片覆盖影响的气候变化的空间变化响应
影响因子：
18.3
作者：
Scherler;Bookhagen;Strecker
通讯作者：
Strecker