globalchange  > 影响、适应和脆弱性
DOI: 10.1002/jgrd.50538
论文题名:
Characterization of dust emission from alluvial sources using aircraft observations and high-resolution modeling
作者: Schepanski K.; Flamant C.; Chaboureau J.-P.; Kocha C.; Banks J.R.; Brindley H.E.; Lavaysse C.; Marnas F.; Pelon J.; Tulet P.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期:13
起始页码: 7237
结束页码: 7259
语种: 英语
英文关键词: dust source ; lidar ; low-level jet ; mesoscale modeling ; mineral dust ; MSG SEVIRI
Scopus关键词: Aircraft ; Computer simulation ; Landforms ; Optical radar ; Dust sources ; Low level jet ; Meso-scale modeling ; Mineral dust ; MSG SEVIRI ; Dust ; atmospheric pollution ; backscatter ; boundary layer ; dust ; emission ; numerical model ; observational method ; pollutant source ; resolution ; sensitivity analysis ; SEVIRI ; spatial resolution ; upland region ; Falconidae
英文摘要: We investigate mineral dust emission from alluvial sediments within the upland region in northern Mauritania in the vicinity of a decaying nocturnal low-level jet (LLJ). For the first time, the impact of valleys that are embedded in a rather homogeneous surrounding is investigated with regard to their role as dust source. Measures for local atmospheric dust burden were retrieved from airborne observations, satellite observations, and model simulations and analyzed in order to provide complementary information at different horizontal scales. Observations by the LEANDRE Nouvelle Generation backscatter lidar system flying aboard the French Falcon 20 aircraft were taken along five parallel flight legs perpendicular to the orientation of the main valley system dominating the topography of the study area. Results from a comparison of lidar-derived extinction coefficients with topography and aerial photographs confirm the relevance of (1) alluvial sediments at the valley bottoms as a dust source, and (2) the break-down of the nocturnal LLJ as a trigger for dust emission in this region. An evaluation of the AROME regional model, forecasting dust at high resolution (5 km grid), points toward an under-representation of alluvial dust sources in this region. This is also evident from simulations by the MesoNH research model. Although MesoNH simulations show higher dust loadings than AROME, which are more comparable to the observations, both models underestimate the dust concentrations within the boundary layer compared to lidar observations. A sensitivity study on the impact of horizontal grid spacing (5 km versus 1 km) highlights the importance of spatial resolution on simulated dust loadings. Key Points Investigation of the impact of dust emission from alluvial sources Alluvial dust sources are underrepresented in mesoscale dust models Importance of developing an explicit representation of alluvial sources ©2013. American Geophysical Union. All Rights Reserved.
资助项目: 257543
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63575
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Leibniz Institute for Tropospheric Research, Permoser Str. 15, DE-04318 Leipzig, Germany; Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS-Université Pierre et Marie Curie, Université Versailles, Paris, Saint Quentin, France; Laboratoire d'Aérologie, University of Toulouse and CNRS, Toulouse, France; Centre National de Recherches Météorologique, CNRM and GAME, Météo France, Toulouse, France; Space and Atmospherics Physics Group, Imperial College London, London, United Kingdom; Laboratoire des Sciences du Climat et de l'Environnement, CEA, CNRS, Gif-sur-Yvette, France; Laboratoire de l'Atmosphère et des Cyclones, Université de la Réunion, Météo-France, Saint-Denis de La Réunion, France

Recommended Citation:
Schepanski K.,Flamant C.,Chaboureau J.-P.,et al. Characterization of dust emission from alluvial sources using aircraft observations and high-resolution modeling[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(13)
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