Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-10893-2017 |
A meteorological and chemical overview of the DACCIWA field campaign in West Africa in June-July 2016 | |
Knippertz, Peter1; Fink, Andreas H.1; Deroubaix, Adrien2; Morris, Eleanor3; Tocquer, Flore4; Evans, Mat J.3; Flamant, Cyrille5; Gaetani, Marco5; Lavaysse, Christophe6; Mari, Celine4; Marsham, John H.7; Meynadier, Remi8; Affo-Dogo, Abalo9; Bahaga, Titike1; Brosse, Fabien4; Deetz, Konrad1; Guebsi, Ridha5; Latifou, Issaou9; Maranan, Marlon1; Rosenberg, Philip D.7; Schlueter, Andreas1 | |
2017-09-14 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:17 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; France; England; Italy; Togo |
英文摘要 | In June and July 2016 the Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) project organised a major international field campaign in southern West Africa (SWA) including measurements from three inland ground supersites, urban sites in Cotonou and Abidjan, radiosondes, and three research aircraft. A significant range of different weather situations were encountered during this period, including the monsoon onset. The purpose of this paper is to characterise the large-scale setting for the campaign as well as synoptic and mesoscale weather systems affecting the study region in the light of existing conceptual ideas, mainly using objective and subjective identification algorithms based on (re-)analysis and satellite products. In addition, it is shown how the described synoptic variations influence the atmospheric composition over SWA through advection of mineral dust, biomass burning and urban pollution plumes. The boreal summer of 2016 was characterised by Pacific La Nina, Atlantic El Nino and warm eastern Mediterranean conditions, whose competing influences on precipitation led to an overall average rainy season. During the relatively dusty pre-onset Phase 1 (1-21 June 2016), three westward-propagating coherent cyclonic vortices between 4 and 13 degrees N modulated winds and rainfall in the Guinea coastal area. The monsoon onset occurred in connection with a marked extra-tropical trough and cold surge over northern Africa, leading to a breakdown of the Saharan heat low and African easterly jet and a suppression of rainfall. During this period, quasi-stationary low-level vortices associated with the trough transformed into more tropical, propagating disturbances resembling an African easterly wave (AEW). To the east of this system, moist southerlies penetrated deep into the continent. The post-onset Phase 2 (22 June-20 July 2016) was characterised by a significant increase in low-level cloudiness, unusually dry conditions and strong northeastward dispersion of urban pollution plumes in SWA as well as rainfall modulation by westward-propagating AEWs in the Sahel. Around 12-14 July 2016 an interesting and so-far undocumented cyclonic-anticyclonic vortex couplet crossed SWA. The anticyclonic centre had its origin in the Southern Hemisphere and transported unusually dry air filled with aged aerosol into the region. During Phase 3 (21-26 July 2016), a similar vortex couplet slightly farther north created enhanced westerly moisture transports into SWA and extraordinarily wet conditions, accompanied by a deep penetration of the biomass burning plume from central Africa. Finally, a return to more undisturbed monsoon conditions took place during Phase 4 ( 27-31 July 2016). The in-depth synoptic analysis reveals that several significant weather systems during the DACCIWA campaign cannot be attributed unequivocally to any of the tropical waves and disturbances described in the literature and thus deserve further study. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000410641400001 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; SAHARAN HEAT LOW ; EASTERLY WAVES ; SUMMER MONSOON ; INTRASEASONAL VARIABILITY ; TROPICAL ATLANTIC ; INTERANNUAL VARIABILITY ; 3-DIMENSIONAL STRUCTURE ; ATMOSPHERIC PROCESSES ; BOUNDARY-LAYER |
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/21726 |
专题 | 地球科学 |
作者单位 | 1.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, D-76128 Karlsruhe, Germany; 2.UPMC Univ Paris 06, Univ Paris Saclay, Lab Meteorol Dynam,Sorbonne Univ,CNRS, Ecole Polytech,IPSL Res Univ,Ecole Normale Super, F-91128 Palaiseau, France; 3.Univ York, Dept Chem, Wolfson Atmospher Chem Labs, York YO10 5DD, N Yorkshire, England; 4.Univ Toulouse, UPS, CNRS, Lab Aerol, F-31400 Toulouse, France; 5.UPMC Univ Paris 06, CNRS, UVSQ, LATMOS IPSL,Sorbonne Univ, F-75252 Paris, France; 6.European Commiss, Joint Res Ctr, Ispra, VA, Italy; 7.Univ Leeds, Sch Earth & Environm, Natl Ctr Atmospher Sci, Leeds LS2 9JT, W Yorkshire, England; 8.AXA Grp Risk Management Dept, Paris, France; 9.Direct Gen Meteo Natl, BP 1505, Lome, Togo |
推荐引用方式 GB/T 7714 | Knippertz, Peter,Fink, Andreas H.,Deroubaix, Adrien,et al. A meteorological and chemical overview of the DACCIWA field campaign in West Africa in June-July 2016[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(17). |
APA | Knippertz, Peter.,Fink, Andreas H..,Deroubaix, Adrien.,Morris, Eleanor.,Tocquer, Flore.,...&Schlueter, Andreas.(2017).A meteorological and chemical overview of the DACCIWA field campaign in West Africa in June-July 2016.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(17). |
MLA | Knippertz, Peter,et al."A meteorological and chemical overview of the DACCIWA field campaign in West Africa in June-July 2016".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.17(2017). |
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