| DOI: | 10.1002/2015GL063025
|
| 论文题名: | ASCAT observations of downdrafts from mesoscale convective systems |
| 作者: | Kilpatrick T.J.; Xie S.-P.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-8853
|
| EISSN: | 1944-8584
|
| 出版年: | 2015
|
| 卷: | 42, 期:6 | | 起始页码: | 1951
|
| 结束页码: | 1958
|
| 语种: | 英语
|
| 英文关键词: | convective downdrafts
; scatterometry
|
| Scopus关键词: | Atmospheric temperature
; Meteorological instruments
; Precipitation (meteorology)
; Rain
; Brightness temperatures
; Convective downdrafts
; Equatorial Pacific Ocean
; Mesoscale Convective System
; Observation Period
; Satellite measurements
; Scatterometry
; Surface temperatures
; Storms
; air temperature
; ASCAT
; atmospheric convection
; buoyancy
; climate modeling
; mesoscale meteorology
; raindrop
; wind field
; Pacific Ocean
; Pacific Ocean (Equatorial)
|
| 英文摘要: | Downdrafts of air cooled by evaporating raindrops are an essential component of mesoscale convective systems (MCSs). Here we use surface wind observations from the Advanced SCATterometer (ASCAT) to identify MCS downdrafts over the western equatorial Pacific Ocean as regions of horizontal wind divergence exceeding 10-4 s-1. More than 1300 downdrafts are identified over the observation period (2009-2014). The downdraft signal in the surface winds is validated with satellite measurements of brightness temperature and rainfall rate, and surface buoy measurements of air temperature; composite analysis with these measurements indicates that ASCAT detects downdrafts that lag the peak convection by 8-12h. While ASCAT resolves mesoscale downdrafts in regions of light rain, a composite against buoy air temperature indicates that ASCAT fails to resolve the stronger convective-scale downdrafts associated with heavy rainfall at squall fronts. Nevertheless, the global observations by the satellite scatterometer open a new avenue for studying MCSs. Key Points The ASCAT scatterometer detects downdrafts from mesoscale convective systems Observations of OLR, rain, and surface temperature corroborate the downdrafts ASCAT-observed downdrafts lag the peak convection by 8-12 h ©2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927739896&doi=10.1002%2f2015GL063025&partnerID=40&md5=6fd27f9949bf97aa7ae146818b71d75d
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8469
|
| Appears in Collections: | 科学计划与规划
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States
|
| Recommended Citation: | |
Kilpatrick T.J.,Xie S.-P.. ASCAT observations of downdrafts from mesoscale convective systems[J]. Geophysical Research Letters,2015-01-01,42(6).
|
|
|