Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-016-3137-0 |
The influence of tropical forcing on extreme winter precipitation in the western Himalaya | |
Cannon, Forest1,2; Carvalho, Leila M. V.1,2; Jones, Charles1,2; Hoell, Andrew3; Norris, Jesse2; Kiladis, George N.3; Tahir, Adnan A.4 | |
2017-02-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Pakistan |
英文摘要 | Within the Karakoram and western Himalaya (KH), snowfall from winter westerly disturbances (WD) maintains the region's snowpack and glaciers, which melt seasonally to sustain water resources for downstream populations. WD activity and subsequent precipitation are influenced by global atmospheric variability and tropical-extratropical interactions. On interannual time-scales, El Nio related changes in tropical diabatic heating induce a Rossby wave response over southwest Asia that is linked with enhanced dynamical forcing of WD and available moisture. Consequently, extreme orographic precipitation events are more frequent during El Nio than La Nia or neutral conditions. A similar spatial pattern of tropical diabatic heating is produced by the MJO at intraseasonal scales. In comparison to El Nio, the Rossby wave response to MJO activity is less spatially uniform over southwest Asia and varies on shorter time-scales. This study finds that the MJO's relationship with WD and KH precipitation is more complex than that of ENSO. Phases of the MJO propagation cycle that favor the dynamical enhancement of WD simultaneously suppress available moisture over southwest Asia, and vice versa. As a result, extreme precipitation events in the KH occur with similar frequency in most phases of the MJO, however, there is a transition in the relative importance of dynamical forcing and moisture in WD to orographic precipitation in the KH as the MJO evolves. These findings give insight into the dynamics and predictability of extreme precipitation events in the KH through their relationship with global atmospheric variability, and are an important consideration in evaluating Asia's water resources. |
英文关键词 | Extreme precipitation events Tropical forcing Karakoram Madden-Julian oscillation El Nino southern oscillation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394150500029 |
WOS关键词 | CENTRAL-SOUTHWEST ASIA ; SNOW COVER ; KARAKORAM ; CIRCULATION ; VARIABILITY ; RAINFALL ; TELECONNECTIONS ; DISTURBANCES ; OSCILLATION ; SEASONALITY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35230 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA; 2.Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA; 3.NOAA, Div Phys Sci, Earth Syst Res Lab, Boulder, CO USA; 4.COMSATS Inst Informat Technol, Dept Environm Sci, Islamabad, Pakistan |
推荐引用方式 GB/T 7714 | Cannon, Forest,Carvalho, Leila M. V.,Jones, Charles,et al. The influence of tropical forcing on extreme winter precipitation in the western Himalaya[J]. CLIMATE DYNAMICS,2017,48. |
APA | Cannon, Forest.,Carvalho, Leila M. V..,Jones, Charles.,Hoell, Andrew.,Norris, Jesse.,...&Tahir, Adnan A..(2017).The influence of tropical forcing on extreme winter precipitation in the western Himalaya.CLIMATE DYNAMICS,48. |
MLA | Cannon, Forest,et al."The influence of tropical forcing on extreme winter precipitation in the western Himalaya".CLIMATE DYNAMICS 48(2017). |
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