| DOI: | 10.1002/2014GL060958
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| 论文题名: | Rainfall-aerosol relationships explained by wet scavenging and humidity |
| 作者: | Grandey B.S.; Gururaj A.; Stier P.; Wagner T.M.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9863
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| EISSN: | 1944-9594
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| 出版年: | 2014
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| 卷: | 41, 期:15 | | 起始页码: | 5678
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| 结束页码: | 5684
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| 语种: | 英语
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| 英文关键词: | aerosol
; cloud
; convection
; convective
; precipitation
; rainfall
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| Scopus关键词: | Aerosols
; Atmospheric aerosols
; Atmospheric humidity
; Clouds
; Heat convection
; Precipitation (chemical)
; Rain
; Optical properties
; Satellites
; Aerosol optical depths
; Atmospheric columns
; convective
; Convective precipitation
; Covariation
; Precipitation rates
; Satellite data
; Wet scavenging
; Satellites
; Climate models
; aerosol
; climate modeling
; humidity
; optical depth
; precipitation (climatology)
; satellite data
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| 英文摘要: | Relationships between precipitation rate and aerosol optical depth, the extinction of light by aerosol in an atmospheric column, have been observed in satellite-retrieved data. What are the reasons for these precipitation-aerosol relationships? We investigate relationships between convective precipitation rate (Rconv) and aerosol optical depth (τtot) using the ECHAM5-HAM aerosol-climate model. We show that negative R conv-τtot relationships arise due to wet scavenging of aerosol. The apparent lack of negative Rconv-τtot relationships in satellite-retrieved data is likely because the satellite data do not sample wet scavenging events. When convective wet scavenging is excluded in the model, we find positive Rconv-τtot relationships in regions where convective precipitation is the dominant form of model precipitation. The spatial distribution of these relationships is in good agreement with satellite-based results. We further demonstrate that a substantial component of these positive relationships arises due to covariation with large-scale relative humidity. Although the interpretation of precipitation-aerosol relationships remains a challenging question, we suggest that progress can be made through a synergy between observations and models. Key Points Negative precipitation-aerosol relationships arise due to wet scavenging Satellites poorly sample aerosol populations depleted by wet scavenging Positive precipitation-aerosol relationships arise due to humidification effects © 2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905609539&doi=10.1002%2f2014GL060958&partnerID=40&md5=4defa7a6daa153f184af0fe5b42cbdf3
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7127
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Center for Environmental Sensing and Modeling, Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
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| Recommended Citation: | |
Grandey B.S.,Gururaj A.,Stier P.,et al. Rainfall-aerosol relationships explained by wet scavenging and humidity[J]. Geophysical Research Letters,2014-01-01,41(15).
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