Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0182.1 |
Tropical Convective Transition Statistics and Causality in the Water Vapor-Precipitation Relation | |
Kuo, Yi-Hung; Neelin, J. David; Mechoso, C. Roberto | |
2017-03-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Previous work by various authors has pointed to the role of lower-free-tropospheric humidity in affecting the onset of deep convection in the tropics. Empirical relationships between column water vapor (CWV) and precipitation have been inferred to result from these effects. Evidence from previous work has included deep convective conditional instability calculations for entraining plumes, in which the lower-free-tropospheric environment affects the onset of deep convection due to the differential impact on buoyancy of turbulent entrainment of dry versus moist air. The relationship between deep convection and water vapor is, however, a two-way interaction because convection also moistens the free troposphere. The present study adds an additional line of evidence toward fully establishing the causality of the precipitation-water vapor relationship. Parameter perturbation experiments using the coupled Community Earth System Model (CESM) with hightime- resolution output are analyzed for a set of statistics for the transition to deep convection, coordinated with observational diagnostics for the Green Ocean Amazon (GOAmazon) campaign and tropical western Pacific Atmospheric Radiation Measurement (ARM) sites. For low values of entrainment in the deep convective scheme, these statistics are radically altered and the observed pickup of precipitation with CWV is no longer seen. In addition to helping cement the dominant direction of causality in the fast-time-scale precipitation-CWV relationship, the results point to impacts of entrainment on the climatology. Because at low entrainment convection can fire before tropospheric moistening, the climatological values of relative humidity are lower than observed. These findings can be consequential to biases in simulated climate and to projections of climate change. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399332300012 |
WOS关键词 | CLOUD-TOP HEIGHT ; HIGH-RESOLUTION SIMULATION ; DEEP CONVECTION ; WESTERN PACIFIC ; ATMOSPHERIC RADIATION ; CUMULUS CONVECTION ; VERTICAL STRUCTURE ; DRY INTRUSION ; DIURNAL CYCLE ; TOGA COARE |
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/29708 |
专题 | 地球科学 |
作者单位 | Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA |
推荐引用方式 GB/T 7714 | Kuo, Yi-Hung,Neelin, J. David,Mechoso, C. Roberto. Tropical Convective Transition Statistics and Causality in the Water Vapor-Precipitation Relation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(3). |
APA | Kuo, Yi-Hung,Neelin, J. David,&Mechoso, C. Roberto.(2017).Tropical Convective Transition Statistics and Causality in the Water Vapor-Precipitation Relation.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(3). |
MLA | Kuo, Yi-Hung,et al."Tropical Convective Transition Statistics and Causality in the Water Vapor-Precipitation Relation".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.3(2017). |
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