Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-19-0144.1 |
Observing Possible Thermodynamic Controls on Tropical Marine Rainfall in Moist Environments | |
Powell, Scott W. | |
2019-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:12页码:3737-3751 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Radar and rawinsonde data from four ground-based observing stations in the tropical Indo-Pacific warm pool were used to identify possible associations of environmental state variables and their vertical profiles with radar-derived rain rate inside a mesoscale radar domain when the column-integrated relative humidity (CRH) exceeds 80%. At CRH exceeding 80%, a wide range-from near 0 to 50 mm day(-1)-in rain rate is observed; therefore, tropospheric moisture was a necessary but insufficient condition for deep convection. This study seeks to identify possible factors that inhibit rainfall when the atmosphere is sufficiently moist to support large precipitation rates. The domain-mean rain rate was highly sensitive to the areal coverage of intense, convective rainfall that occurs. There were two fundamentally different instances in which convective area was low. One was when the radar domain is primarily occupied by weakly precipitating, stratiform echoes. The other was when the radar domain contained almost no precipitating echoes of any type. While the former was dependent upon the stage of the convective life cycle seen by radar, the latter was probably dependent upon the convective environment. Areal coverage of convective echoes was largely determined by the number of individual convective echoes rather than their sizes, so changes in the clear-air environment of updrafts might have governed how many updrafts grew into deep cumulonimbi. The most likely environmental influence on convective rainfall identified using rawinsonde data was 900-700-hPa lapse rate; however, processes occurring on spatial scales smaller than a radar domain were probably also important but not investigated. |
英文关键词 | Deep convection Convective clouds Precipitation Radars Radar observations |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000497730200003 |
WOS关键词 | CONVECTIVE TRANSITION STATISTICS ; VERTICAL WIND SHEAR ; WATER-VAPOR ; STRATIFORM INSTABILITY ; PRECIPITATION ; PARAMETERIZATION ; CONVERGENCE ; CLIMATOLOGY ; ENTRAINMENT ; VARIABILITY |
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/226004 |
专题 | 环境与发展全球科技态势 |
作者单位 | Naval Postgrad Sch, Dept Meteorol, Monterey, CA 93943 USA |
推荐引用方式 GB/T 7714 | Powell, Scott W.. Observing Possible Thermodynamic Controls on Tropical Marine Rainfall in Moist Environments[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(12):3737-3751. |
APA | Powell, Scott W..(2019).Observing Possible Thermodynamic Controls on Tropical Marine Rainfall in Moist Environments.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(12),3737-3751. |
MLA | Powell, Scott W.."Observing Possible Thermodynamic Controls on Tropical Marine Rainfall in Moist Environments".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.12(2019):3737-3751. |
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