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DOI | 10.1029/2019JD030835 |
Episodes of Warm-Air Advection Causing Cloud-Surface Decoupling During the MARCUS | |
Zheng, Youtong; Li, Zhanqing | |
2019-11-24 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:22页码:12227-12243 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | It has been known for decades that advection of a cloud-topped marine boundary layer (CTBL) over warmer sea surface causes the stratification (or decoupling) of the CTBL via the entrainment feedback, a mechanism commonly known as "deepening-warming" decoupling that is typical in subtropics. This study focuses on the opposite direction of advection, that is, low-level warm air advection (LLWAA), and its impacts on the decoupling degree of a CTBL. Our hypothesis is that LLWAA stabilizes a CTBL, causing a decoupling of the CTBL. It is tested for three LLWAA episodes observed during the Measurements of Aerosols, Radiation, and CloUds over the Southern Ocean (MARCUS) field campaign between the Hobart (43 degrees S, 147 degrees E), Australia, and several Antarctic coast stations. By synthesizing the shipborne measurements of CTBL structure, Himawari-8 satellite imagery of cloud fields, and reanalysis of meteorological field, four common characteristics of CTBLs under the LLWAA are found: (1) CTBLs are highly stratified to the extent that penetrations of cumulus into main temperature inversions, which are common for subtropical decoupled CTBLs, do not exist; (2) sea surface temperature is 1-2 K lower than the near-surface air temperature; (3) clouds manifest stratiform with lifetime as long as several tens of hours; and (4) they locate in warm sectors of middle-latitude cyclones. Possible mechanisms for the maintenance of decoupled clouds under LLWAA are discussed in terms of dynamic and thermodynamic factors. Lapse rates of the decoupled CTBLs are markedly lower than those commonly used for passive satellite estimation of cloud top heights. |
英文关键词 | marine boundary layer cloud-surface decoupling warm air advection |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000498240600001 |
WOS关键词 | MARINE BOUNDARY-LAYER ; SOUTHERN-OCEAN ; SUBSEASONAL VARIABILITY ; AIRCRAFT OBSERVATIONS ; STRATOCUMULUS CLOUDS ; PRECIPITATION ; SATELLITE ; CUMULUS ; ENTRAINMENT ; MODELS |
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/225805 |
专题 | 环境与发展全球科技态势 |
作者单位 | Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA |
推荐引用方式 GB/T 7714 | Zheng, Youtong,Li, Zhanqing. Episodes of Warm-Air Advection Causing Cloud-Surface Decoupling During the MARCUS[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(22):12227-12243. |
APA | Zheng, Youtong,&Li, Zhanqing.(2019).Episodes of Warm-Air Advection Causing Cloud-Surface Decoupling During the MARCUS.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(22),12227-12243. |
MLA | Zheng, Youtong,et al."Episodes of Warm-Air Advection Causing Cloud-Surface Decoupling During the MARCUS".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.22(2019):12227-12243. |
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