Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-19-14979-2019 |
Evidence of the complexity of aerosol transport in the lower troposphere on the Namibian coast during AEROCLO-sA | |
Chazette, Patrick1; Flamant, Cyrille2; Totems, Julien1; Gaetani, Marco2,3; Smith, Gwendoline1,3; Baron, Alexandre1; Landsheere, Xavier3; Desboeufs, Karine3; Doussin, Jean-Francois3; Formenti, Paola3 | |
2019-12-11 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2019 |
卷号 | 19期号:23页码:14979-15005 |
文章类型 | Article |
语种 | 英语 |
国家 | France |
英文摘要 | The evolution of the vertical distribution and optical properties of aerosols in the free troposphere, above stratocumulus, is characterized for the first time over the Namibian coast, a region where uncertainties on aerosol-cloud coupling in climate simulations are significant. We show the high variability of atmospheric aerosol composition in the lower and middle troposphere during the Aerosols, Radiation and Clouds in southern Africa (AEROCLO-sA) field campaign (22 August-12 September 2017) around the Henties Bay supersite using a combination of ground-based, airborne and space-borne lidar measurements. Three distinct periods of 4 to 7 d are observed, associated with increasing aerosol loads (aerosol optical thickness at 550 nm ranging from similar to 0.2 to similar to 0.7), as well as increasing lofted aerosol layer depth and top altitude. Aerosols are observed up to 6 km above mean sea level during the later period. Aerosols transported within the free troposphere are mainly polluted dust (predominantly dust mixed with smoke from fires) for the first two periods (22 August-1 September 2017) and smoke for the last part (3-9 September) of the field campaign. As shown by Lagrangian back-trajectory analyses, the main contribution to the aerosol optical thickness over Henties Bay is shown to be due to biomass burning over Angola. Nevertheless, in early September, the highest aerosol layers (between 5 and 6 km above mean sea level) seem to come from South America (southern Brazil, Argentina and Uruguay) and reach Henties Bay after 3 to 6 d. Aerosols appear to be transported eastward by the midlatitude westerlies and towards southern Africa by the equatorward moving cut-off low originating from within the westerlies. All the observations show a very complex mixture of aerosols over the coastal regions of Namibia that must be taken into account when investigating aerosol radiative effects above stratocumulus clouds in the southeast Atlantic Ocean. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000502287000003 |
WOS关键词 | AIRBORNE LIDAR MEASUREMENTS ; SOUTHERN ANNULAR MODE ; WATER-VAPOR ; ABSORBING AEROSOLS ; OPTICAL-PROPERTIES ; VERTICAL STRUCTURE ; RADIATIVE BUDGET ; BOUNDARY-LAYER ; ERA-INTERIM ; ATLANTIC |
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/224121 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.UVSQ, CNRS, UMR 1572, CEA Saclay,Lab Mixte CEA,LSCE, F-91191 Gif Sur Yvette, France; 2.Sorbonne Univ, UVSQ, CNRS, LATMOS,IPSL, Paris, France; 3.Univ Paris, Univ Paris Est Creteil, CNRS, Inst Pierre Simon Lapl,LISA,UMR 7583, Creteil, France |
推荐引用方式 GB/T 7714 | Chazette, Patrick,Flamant, Cyrille,Totems, Julien,et al. Evidence of the complexity of aerosol transport in the lower troposphere on the Namibian coast during AEROCLO-sA[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(23):14979-15005. |
APA | Chazette, Patrick.,Flamant, Cyrille.,Totems, Julien.,Gaetani, Marco.,Smith, Gwendoline.,...&Formenti, Paola.(2019).Evidence of the complexity of aerosol transport in the lower troposphere on the Namibian coast during AEROCLO-sA.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(23),14979-15005. |
MLA | Chazette, Patrick,et al."Evidence of the complexity of aerosol transport in the lower troposphere on the Namibian coast during AEROCLO-sA".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.23(2019):14979-15005. |
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