globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-015-2635-9
Scopus记录号: 2-s2.0-84957846125
论文题名:
A process-based evaluation of dust-emitting winds in the CMIP5 simulation of HadGEM2-ES
作者: Fiedler S.; Knippertz P.; Woodward S.; Martin G.M.; Bellouin N.; Ross A.N.; Heinold B.; Schepanski K.; Birch C.E.; Tegen I.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期:2017-03-04
起始页码: 1107
结束页码: 1130
语种: 英语
英文关键词: Climatology ; Dust emission ; Earth system model ; Geostrophic wind ; Nocturnal low-level jet ; North Africa
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 Bodélé 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. © 2015, The Author(s).
资助项目: DECC, Department for Environment, Food and Rural Affairs ; Defra, Department for Environment, Food and Rural Affairs ; ERC, Department for Environment, Food and Rural Affairs ; Department for Environment, Food and Rural Affairs
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53825
Appears in Collections:过去全球变化的重建

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作者单位: School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Kaiserstrasse 12, Karlsruhe, Germany; Max Planck Institute for Meteorology, Bundesstrasse 53, Hamburg, Germany; Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Kaiserstrasse 12, Karlsruhe, Germany; Met Office, Exeter, United Kingdom; Department of Meteorology, University of Reading, Reading, United Kingdom; Leibniz Institute for Tropospheric Research, Permoserstrasse 15, Leipzig, Germany; MetOffice@Leeds, School of Earth and Environment, University of Leeds, Leeds, United Kingdom

Recommended Citation:
Fiedler S.,Knippertz P.,Woodward S.,et al. A process-based evaluation of dust-emitting winds in the CMIP5 simulation of HadGEM2-ES[J]. Climate Dynamics,2016-01-01,46(2017-03-04)
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