DOI: 10.1002/2015GL067342
论文题名: Rainfall variations induced by the lunar gravitational atmospheric tide and their implications for the relationship between tropical rainfall and humidity
作者: Kohyama T. ; Wallace J.M.
刊名: Geophysical Research Letters
ISSN: 0094-9431
EISSN: 1944-9162
出版年: 2016
卷: 43, 期: 2 起始页码: 918
结束页码: 923
语种: 英语
英文关键词: atmospheric tides
; Clausius-Clapeyron relationship
; ERA-Interim reanalysis data
; relative humidity change
; RH-rainfall relationship
; TRMM rainfall data
Scopus关键词: Precipitation (meteorology)
; Rain
; Rain gages
; Tides
; Atmospheric tide
; Clausius-Clapeyron relationship
; Rainfall data
; Reanalysis
; Relative humidity changes
; Atmospheric humidity
; adiabatic process
; atmospheric tide
; condensation
; lunar cycle
; rainfall
; relative humidity
; semidiurnal tide
; tropical environment
; vapor pressure
英文摘要: Classical tidal theory predicts that the lunar gravitational semidiurnal tide (L2) should induce perturbations in relative humidity (RH). Adiabatic expansion in divergent flow in advance of the L2 pressure minimum cools the air and reduces its saturation vapor pressure, thereby increasing the rate of condensation in saturated air parcels and causing the relative humidity (RH) of unsaturated parcels to rise. Here we detect a statistically significant L2 signature in precipitation rate (P) in a 15 year, eight times daily, global precipitation data set acquired in the Tropical Rainfall Measuring Mission. Consistent with tidal theory and with the notion that L2 modulates P mainly by perturbing RH, P varies out of phase with pressure, and it increases at a rate of about 10% per 1% increase in RH. These measurements thus provide a measure of the sensitivity of P to planetary-scale changes in RH. Analysis of solar semidiurnal (S2) tidal statistics yields similar results. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956667801&doi=10.1002%2f2015GL067342&partnerID=40&md5=ea109348b1f3cade745dcb4ca64eec44
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10394
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Kohyama T.,Wallace J.M.. Rainfall variations induced by the lunar gravitational atmospheric tide and their implications for the relationship between tropical rainfall and humidity[J]. Geophysical Research Letters,2016-01-01,43(2).