Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s00382-015-2635-9 |
A process-based evaluation of dust-emitting winds in the CMIP5 simulation of HadGEM2-ES | |
Fiedler, Stephanie1,2,3; Knippertz, Peter1,2; Woodward, Stephanie4; Martin, Gill M.4; Bellouin, Nicolas4,5; Ross, Andrew N.1; Heinold, Bernd6; Schepanski, Kerstin6; Birch, Cathryn E.7; Tegen, Ina6 | |
通讯作者 | Fiedler, Stephanie |
来源期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2016 |
卷号 | 46期号:3-4页码:1107-1130 |
英文摘要 | Despite the importance of dust aerosol in the Earth system, state-of-the-art models show a large variety for North African dust emission. This study presents a systematic evaluation of dust emitting-winds in 30 years of the historical model simulation with the UK Met Office Earth-system model HadGEM2-ES for the Coupled Model Intercomparison Project Phase 5. Isolating the effect of winds on dust emission and using an automated detection for nocturnal low-level jets (NLLJs) allow an in-depth evaluation of the model performance for dust emission from a meteorological perspective. The findings highlight that NLLJs are a key driver for dust emission in HadGEM2-ES in terms of occurrence frequency and strength. The annually and spatially averaged occurrence frequency of NLLJs is similar in HadGEM2-ES and ERA-Interim from the European Centre for Medium-Range Weather Forecasts. Compared to ERA-Interim, a stronger pressure ridge over northern Africa in winter and the southward displaced heat low in summer result in differences in location and strength of NLLJs. Particularly the larger geostrophic winds associated with the stronger ridge have a strengthening effect on NLLJs over parts of West Africa in winter. Stronger NLLJs in summer may rather result from an artificially increased mixing coefficient under stable stratification that is weaker in HadGEM2-ES. NLLJs in the Bod,l, Depression are affected by stronger synoptic-scale pressure gradients in HadGEM2-ES. Wintertime geostrophic winds can even be so strong that the associated vertical wind shear prevents the formation of NLLJs. These results call for further model improvements in the synoptic-scale dynamics and the physical parametrization of the nocturnal stable boundary layer to better represent dust-emitting processes in the atmospheric model. The new approach could be used for identifying systematic behavior in other models with respect to meteorological processes for dust emission. This would help to improve dust emission simulations and contribute to decreasing the currently large uncertainty in climate change projections with respect to dust aerosol. |
英文关键词 | Dust emission Nocturnal low-level jet Geostrophic wind Earth system model Climatology North Africa |
类型 | Article |
语种 | 英语 |
国家 | England ; Germany |
收录类别 | SCI-E |
WOS记录号 | WOS:000370030900027 |
WOS关键词 | LOW-LEVEL JET ; DESERT DUST ; DIURNAL CYCLE ; MINERAL DUST ; CONTRASTING NIGHTS ; SOIL-MOISTURE ; AEROSOL ; MODEL ; REANALYSIS ; MONSOON |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/192078 |
作者单位 | 1.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England; 2.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Kaiserstr 12, D-76131 Karlsruhe, Germany; 3.Max Planck Inst Meteorol, Bundesstr 53, D-20146 Hamburg, Germany; 4.Met Off, Exeter EX1 3PB, Devon, England; 5.Univ Reading, Dept Meteorol, Reading RG6 6BB, Berks, England; 6.Leibniz Inst Tropospher Res, Permoserstr 15, D-04318 Leipzig, Germany; 7.Univ Leeds, Sch Earth & Environm, MetOff Leeds, Leeds LS2 9JT, W Yorkshire, England |
推荐引用方式 GB/T 7714 | Fiedler, Stephanie,Knippertz, Peter,Woodward, Stephanie,et al. A process-based evaluation of dust-emitting winds in the CMIP5 simulation of HadGEM2-ES[J],2016,46(3-4):1107-1130. |
APA | Fiedler, Stephanie.,Knippertz, Peter.,Woodward, Stephanie.,Martin, Gill M..,Bellouin, Nicolas.,...&Tegen, Ina.(2016).A process-based evaluation of dust-emitting winds in the CMIP5 simulation of HadGEM2-ES.CLIMATE DYNAMICS,46(3-4),1107-1130. |
MLA | Fiedler, Stephanie,et al."A process-based evaluation of dust-emitting winds in the CMIP5 simulation of HadGEM2-ES".CLIMATE DYNAMICS 46.3-4(2016):1107-1130. |
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