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DOI | 10.1175/JCLI-D-19-0175.1 |
Effect of Teleconnected Land-Atmosphere Coupling on Northeast China Persistent Drought in Spring-Summer of 2017 | |
Zeng, Dingwen1,2,3,4,5; Yuan, Xing1,2; Roundy, Joshua K.6 | |
2019-11-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:21页码:7403-7420 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | Northeast China (NEC) suffered a severe drought that persisted from March to July of 2017 with profound impacts on agriculture and society, raising an urgent need to understand the mechanism for persistent droughts over midlatitudes. Previous drought mechanism studies focused on either large-scale teleconnections or local land-atmosphere coupling, while less attention was paid to their synergistic effects on drought persistence. Here we show that the 2017 NEC drought was triggered by a strong positive phase of the Arctic Oscillation in March, and maintained by the anticyclone over the area south to Lake Baikal (ASLB) through a quasi-stationary Rossby wave in April-July, accompanied by sinking motion and north wind anomaly. By using a land-atmosphere coupling index based on the persistence of positive feedbacks between the boundary layer and land surface, we find that the coupling states over NEC and ASLB shifted from a wet coupling in March to a persistently strengthened dry coupling in April-July. Over ASLB, the dry coupling and sinking motion increased surface sensible heat, decreased cloud cover, and weakened longwave absorption, resulting in a diabatic heating anomaly in the lower atmosphere and a diabatic cooling anomaly in the upper atmosphere. This anomalous vertical heating profile led to a negative anomaly of potential vorticity at low levels, indicating that the land-atmosphere coupling had a phase-lock effect on the Rossby wave train originating from upstream areas, and therefore maintained the NEC drought over downstream regions. Our study suggests that an upstream quasi-stationary wave pattern strengthened by land-atmosphere coupling should be considered in diagnosing persistent droughts, especially over northern midlatitudes. |
英文关键词 | Anticyclones Rossby waves Drought Atmosphere-land interaction Potential vorticity Soil moisture |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000488786600003 |
WOS关键词 | SOIL-MOISTURE ; GEOPOTENTIAL HEIGHT ; VARIABILITY ; EAST ; CIRCULATION ; ANOMALIES ; EXTREMES ; HOT ; PRECIPITATION ; STATIONARY |
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/188101 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Sch Hydrol & Water Resources, Nanjing, Jiangsu, Peoples R China; 2.Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Temperate East Asia, Beijing, Peoples R China; 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China; 4.China Meteorol Adm, Inst Arid Meteorol, Key Lab Arid Climat Change & Reducing Disaster Ga, Lanzhou, Gansu, Peoples R China; 5.China Meteorol Adm, Inst Arid Meteorol, Key Open Lab Arid Climate Change & Disaster Reduc, Lanzhou, Gansu, Peoples R China; 6.Univ Kansas, Dept Civil Environm & Architectural Engn, Lawrence, KS 66045 USA |
推荐引用方式 GB/T 7714 | Zeng, Dingwen,Yuan, Xing,Roundy, Joshua K.. Effect of Teleconnected Land-Atmosphere Coupling on Northeast China Persistent Drought in Spring-Summer of 2017[J]. JOURNAL OF CLIMATE,2019,32(21):7403-7420. |
APA | Zeng, Dingwen,Yuan, Xing,&Roundy, Joshua K..(2019).Effect of Teleconnected Land-Atmosphere Coupling on Northeast China Persistent Drought in Spring-Summer of 2017.JOURNAL OF CLIMATE,32(21),7403-7420. |
MLA | Zeng, Dingwen,et al."Effect of Teleconnected Land-Atmosphere Coupling on Northeast China Persistent Drought in Spring-Summer of 2017".JOURNAL OF CLIMATE 32.21(2019):7403-7420. |
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