Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-8589-2018 |
Subgrid-scale variability in clear-sky relative humidity and forcing by aerosol-radiation interactions in an atmosphere model | |
Petersik, Paul; Salzmann, Marc; Kretzschmar, Jan; Cherian, Ribu; Mewes, Daniel; Quaas, Johannes | |
2018-06-19 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:12页码:8589-8599 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | Atmosphere models with resolutions of several tens of kilometres take subgrid-scale variability in the total specific humidity q(t) into account by using a uniform probability density function (PDF) to predict fractional cloud cover. However, usually only mean relative humidity, (RH) over bar, or mean clear-sky relative humidity, (RH) over bar (cls), is used to compute hygroscopic growth of soluble aerosol particles. While previous studies based on limited-area models and also a global model suggest that subgrid-scale variability in RH should be taken into account for estimating radiative forcing due to aerosol-radiation interactions (RFari), here we present the first estimate of RFari using a global atmospheric model with a parameterization for subgrid-scale variability in RH that is consistent with the assumptions in the model. For this, we sample the subsaturated part of the uniform RH-PDF from the cloud cover scheme for its application in the hygroscopic growth parameterization in the ECHAM6-HAM2 atmosphere model. Due to the non-linear dependence of the hygroscopic growth on RH, this causes an increase in aerosol hygroscopic growth. Aerosol optical depth (AOD) increases by a global mean of 0.009 (similar to 7.8% in comparison to the control run). Especially over the tropics AOD is enhanced with a mean of about 0.013. Due to the increase in AOD, net top of the atmosphere clear-sky solar radiation, SWnet,cls, decreases by -0.22 W m(-2) (similar to -0.08%). Finally, the RFari changes from -0.15 to -0.19 W m(-2) by about 31 %. The reason for this very disproportionate effect is that anthro-pogenic aerosols are disproportionally hygroscopic. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000435585400001 |
WOS关键词 | BLACK CARBON ; SULFATE-AEROSOL ; SOLAR-RADIATION ; CLOUD DROPLETS ; ABSORPTION ; PARAMETERIZATION ; CONDENSATION ; SIMULATIONS ; SCATTERING ; REPRESENTATION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; 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/27309 |
专题 | 地球科学 |
作者单位 | Univ Leipzig, Leipzig Inst Meteorol, Leipzig, Germany |
推荐引用方式 GB/T 7714 | Petersik, Paul,Salzmann, Marc,Kretzschmar, Jan,et al. Subgrid-scale variability in clear-sky relative humidity and forcing by aerosol-radiation interactions in an atmosphere model[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(12):8589-8599. |
APA | Petersik, Paul,Salzmann, Marc,Kretzschmar, Jan,Cherian, Ribu,Mewes, Daniel,&Quaas, Johannes.(2018).Subgrid-scale variability in clear-sky relative humidity and forcing by aerosol-radiation interactions in an atmosphere model.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(12),8589-8599. |
MLA | Petersik, Paul,et al."Subgrid-scale variability in clear-sky relative humidity and forcing by aerosol-radiation interactions in an atmosphere model".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.12(2018):8589-8599. |
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