Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019JD030245 |
Changes in the Impact of the Autumn Tibetan Plateau Snow Cover on the Winter Temperature Over North America in the mid-1990s | |
Qian, QiFeng1; Jia, XiaoJing1; Wu, Renguang1,2 | |
2019-10-11 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | This study investigates the changes in the impact of the interannual variation of autumn snow cover over the eastern Tibetan Plateau (TP; ASCETP) on winter surface air temperature (SAT) over North America (NA) in the mid-1990s using both observational data and a linear baroclinic numerical model. The index of ASCETP shows an abrupt change with a predominant negative phase before and a predominant positive phase after 1994; thus, the analysis is performed for two subperiods: 1979-1994 (P1) and 1995-2014 (P2). An ASCETP-related energy budget analysis shows that the ASCETP variation has a more pronounced cooling effect on the above atmosphere in P1 than in P2. The snow-related anomalous negative geopotential height above the TP is more pronounced and extends farther northeastward in P1 than in P2. Further analysis shows that the relationship between the ASCETP and NA winter SAT is not steady. During P1, associated with an anomalous positive ASCETP, negative geopotential height anomalies emerge over the northeastern TP. These negative anomalies impose an anomalous vorticity perturbation near the East Asian westerly jet core that propagates eastward, forming a wave train-like pattern. It crosses the North Pacific Ocean and reaches the NA region, leading to positive and negative winter SAT anomalies over western and eastern NA, respectively. In contrast, during P2, the impact of anomalous ASCETP on the variation in the winter SAT over NA is weak, probably due to the relatively weak local cooling effect of the ASCETP and the weak ASCETP-related vorticity forcing around the East Asian westerly jet. |
英文关键词 | autumn snow cover Tibetan Plateau North America SAT unsteady relationship |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000489678900001 |
WOS关键词 | ASIAN SUMMER MONSOON ; SOUTHERN-OSCILLATION ; SPRING SNOW ; EAST CHINA ; RAINFALL ; PRECIPITATION ; TELECONNECTIONS ; VARIABILITY ; ANOMALIES ; ATLANTIC |
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/187628 |
专题 | 气候变化 |
作者单位 | 1.Zhejiang Univ, Sch Earth Sci, Hangzhou, Zhejiang, Peoples R China; 2.Chinese Acad Sci, Inst Atmospher Phys, Ctr Monsoon Syst Res, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Qian, QiFeng,Jia, XiaoJing,Wu, Renguang. Changes in the Impact of the Autumn Tibetan Plateau Snow Cover on the Winter Temperature Over North America in the mid-1990s[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019. |
APA | Qian, QiFeng,Jia, XiaoJing,&Wu, Renguang.(2019).Changes in the Impact of the Autumn Tibetan Plateau Snow Cover on the Winter Temperature Over North America in the mid-1990s.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES. |
MLA | Qian, QiFeng,et al."Changes in the Impact of the Autumn Tibetan Plateau Snow Cover on the Winter Temperature Over North America in the mid-1990s".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2019). |
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