Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-018-4246-8 |
Variability of summertime Tibetan tropospheric temperature and associated precipitation anomalies over the central-eastern Sahel | |
Nan, Sulan1,2; Zhao, Ping1,3; Chen, Junming1,2 | |
2019-02-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:1819-1835 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The relationship between the Tibetan tropospheric thermal condition and West African monsoon precipitation during boreal summer, and the associated physical mechanisms, are investigated. A significant positive correlation exists between the summertime Tibetan tropospheric temperature (TTT) and central-eastern Sahel precipitation. When the TTT increases, higher-than-normal precipitation occurs over the central-eastern Sahel, and vice versa. The increased tropospheric temperature over the western Tibetan Plateau (TP)-Mediterranean Sea region associated with a high TTT forms a tropospheric temperature gradient from the middle latitudes to the subtropics, which is accompanied by an anomalous zonal-vertical circulation from the western TP to the Mediterranean Sea. The tropospheric temperature distribution associated with a high TTT over the western TP-Mediterranean Sea region contributes to a tropospheric temperature gradient from the eastern Mediterranean and West Asia to the western Mediterranean, which is accompanied by an anomalous meridional-vertical circulation cell over the Mediterranean Sea-Africa region. The meridional-vertical circulation cell is accompanied by a deepened African continental low, and enhanced low-level westerly and southwesterly winds from the tropical and eastern Atlantic to inland Africa. These conditions favor an increase in precipitation over the central-eastern Sahel. Thus, the relationship between the summer TTT and precipitation over the central-eastern Sahel is explained by the anomalous zonal-vertical circulation between the western TP and the Mediterranean Sea, and the anomalous meridional-vertical circulation cell over the Mediterranean Sea-Africa region. The zonal and meridional circulations are connected by the vertical motion over the Mediterranean Sea. Sensitivity experiments with an atmospheric model, in which the surface vegetation type is adjusted, demonstrate the impacts of an increase in the summertime TTT on the anomalous zonal-vertical circulation between the western TP and the Mediterranean Sea, the anomalous meridional-vertical circulation cell over the Mediterranean Sea-Africa region, the deepened African continental low, and the enhanced low-level westerly winds from the tropical and eastern Atlantic to inland Africa. Thus, the relationship between the summertime TTT and central-eastern Sahelian precipitation reflects an impact of the TTT on central-eastern Sahelian precipitation. |
英文关键词 | Tibetan plateau Tropospheric thermal condition Central-eastern Sahel West African monsoon precipitation Mediterranean Sea |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000460902200030 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; INTERDECADAL VARIABILITY ; INTERANNUAL VARIABILITY ; TELECONNECTION PATTERN ; RAINFALL VARIABILITY ; GLOBAL PRECIPITATION ; NORTH-AFRICAN ; WEST-AFRICA ; CLIMATE ; MODEL |
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/36316 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing 100081, Peoples R China; 2.Chinese Acad Meteorol Sci, Inst Climate Syst, Beijing 100081, Peoples R China; 3.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Nan, Sulan,Zhao, Ping,Chen, Junming. Variability of summertime Tibetan tropospheric temperature and associated precipitation anomalies over the central-eastern Sahel[J]. CLIMATE DYNAMICS,2019,52:1819-1835. |
APA | Nan, Sulan,Zhao, Ping,&Chen, Junming.(2019).Variability of summertime Tibetan tropospheric temperature and associated precipitation anomalies over the central-eastern Sahel.CLIMATE DYNAMICS,52,1819-1835. |
MLA | Nan, Sulan,et al."Variability of summertime Tibetan tropospheric temperature and associated precipitation anomalies over the central-eastern Sahel".CLIMATE DYNAMICS 52(2019):1819-1835. |
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