Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3665-2 |
Understanding the Central Equatorial African long-term drought using AMIP-type simulations | |
Hua, Wenjian1,2; Zhou, Liming1; Chen, Haishan2; Nicholson, Sharon E.3; Jiang, Yan1; Raghavendra, Ajay1 | |
2018-02-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:1115-1128 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | Previous studies show that Indo-Pacific sea surface temperature (SST) variations may help to explain the observed long-term drought during April-May-June (AMJ) since the 1990s over Central equatorial Africa (CEA). However, the underlying physical mechanisms for this drought are still not clear due to observation limitations. Here we use the AMIP-type simulations with 24 ensemble members forced by observed SSTs from the ECHAM4.5 model to explore the likely physical processes that determine the rainfall variations over CEA. We not only examine the ensemble mean (EM), but also compare the "good" and "poor" ensemble members to understand the intra-ensemble variability. In general, EM and the "good" ensemble member can simulate the drought and associated reduced vertical velocity and anomalous anti-cyclonic circulation in the lower troposphere. However, the "poor" ensemble members cannot simulate the drought and associated circulation patterns. These contrasts indicate that the drought is tightly associated with the tropical Walker circulation and atmospheric teleconnection patterns. If the observational circulation patterns cannot be reproduced, the CEA drought will not be captured. Despite the large intra-ensemble spread, the model simulations indicate an essential role of SST forcing in causing the drought. These results suggest that the long-term drought may result from tropical Indo-Pacific SST variations associated with the enhanced and westward extended tropical Walker circulation. |
英文关键词 | Central Equatorial Africa Drought AMIP Sea surface temperature |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425328700022 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; RAINFALL VARIABILITY ; CLIMATE MODELS ; GENERAL-CIRCULATION ; WALKER CIRCULATION ; SAHEL DROUGHT ; LAND-USE ; PROJECT ; PRECIPITATION ; ENSEMBLE |
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/35216 |
专题 | 气候变化 |
作者单位 | 1.SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY 12222 USA; 2.Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Joint Int Res Lab Climate & Environm Change ILCEC, Minist Educ KLME,CICFEMD, Nanjing 210044, Jiangsu, Peoples R China; 3.Florida State Univ, Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA |
推荐引用方式 GB/T 7714 | Hua, Wenjian,Zhou, Liming,Chen, Haishan,et al. Understanding the Central Equatorial African long-term drought using AMIP-type simulations[J]. CLIMATE DYNAMICS,2018,50:1115-1128. |
APA | Hua, Wenjian,Zhou, Liming,Chen, Haishan,Nicholson, Sharon E.,Jiang, Yan,&Raghavendra, Ajay.(2018).Understanding the Central Equatorial African long-term drought using AMIP-type simulations.CLIMATE DYNAMICS,50,1115-1128. |
MLA | Hua, Wenjian,et al."Understanding the Central Equatorial African long-term drought using AMIP-type simulations".CLIMATE DYNAMICS 50(2018):1115-1128. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论