Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-15261-2018 |
Large simulated radiative effects of smoke in the south-east Atlantic | |
Gordon, Hamish1; Field, Paul R.1,2; Abel, Steven J.2; Dalvi, Mohit2; Grosvenor, Daniel P.1; Hill, Adrian A.2; Johnson, Ben T.2; Miltenberger, Annette K.1; Yoshioka, Masaru1; Carslaw, Ken S.1 | |
2018-10-24 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:20页码:15261-15289 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | A 1200 x 1200 km(2) area of the tropical South Atlantic Ocean near Ascension Island is studied with the HadGEM climate model at convection-permitting and global resolutions for a 10-day case study period in August 2016. During the simulation period, a plume of biomass burning smoke from Africa moves into the area and mixes into the clouds. At Ascension Island, this smoke episode was the strongest of the 2016 fire season. The region of interest is simulated at 4 km resolution, with no parameterised convection scheme. The simulations are driven by, and compared to, the global model. For the first time, the UK Chemistry and Aerosol model (UKCA) is included in a regional model with prognostic aerosol number concentrations advecting in from the global model at the boundaries of the region. Fire emissions increase the total aerosol burden by a factor of 3.7 and cloud droplet number concentrations by a factor of 3, which is consistent with MODIS observations. In the regional model, the inversion height is reduced by up to 200m when smoke is included. The smoke also affects precipitation, to an extent which depends on the model microphysics. The microphysical and dynamical changes lead to an increase in liquid water path of 60gm(-2) relative to a simulation without smoke aerosol, when averaged over the polluted period. This increase is uncertain, and smaller in the global model. It is mostly due to radiatively driven dynamical changes rather than precipitation suppression by aerosol. Over the 5-day polluted period, the smoke has substantial direct radiative effects of +11.4Wm(-2) in the regional model, a semi-direct effect of -30.5 Wm(-2) and an indirect effect of -10.1Wm(-2). Our results show that the radiative effects are sensitive to the structure of the model (global versus regional) and the parameterization of rain autoconversion. Furthermore, we simulate a liquid water path that is bi-ased high compared to satellite observations by 22% on average, and this leads to high estimates of the domain-averaged aerosol direct effect and the effect of the aerosol on cloud albedo. With these caveats, we simulate a large net cooling across the region, of -27.6Wm(-2). |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000457708800001 |
WOS关键词 | BIOMASS BURNING AEROSOL ; CLIMATE-COMPOSITION MODEL ; ABSORBING AEROSOLS ; OPTICAL-PROPERTIES ; BOUNDARY-LAYER ; SAFARI 2000 ; CLOUD ; STRATOCUMULUS ; PARAMETERIZATION ; RETRIEVALS |
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/24945 |
专题 | 地球科学 |
作者单位 | 1.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England; 2.Met Off, Fitzroy Rd, Exeter EX1 3PB, Devon, England |
推荐引用方式 GB/T 7714 | Gordon, Hamish,Field, Paul R.,Abel, Steven J.,et al. Large simulated radiative effects of smoke in the south-east Atlantic[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(20):15261-15289. |
APA | Gordon, Hamish.,Field, Paul R..,Abel, Steven J..,Dalvi, Mohit.,Grosvenor, Daniel P..,...&Carslaw, Ken S..(2018).Large simulated radiative effects of smoke in the south-east Atlantic.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(20),15261-15289. |
MLA | Gordon, Hamish,et al."Large simulated radiative effects of smoke in the south-east Atlantic".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.20(2018):15261-15289. |
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