Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019JD031365 |
The Observed Influence of Tropical Convection on the Saharan Dust Layer | |
Sauter, Kathryn1; 39;Ecuyer, Tristan2 | |
2019-10-31 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA |
英文摘要 | Interactions between convection and the Saharan Air Layer in the tropical Atlantic Ocean are quantified using a novel compositing technique that leverages geostationary cloud observations to add temporal context to the polar orbiting CloudSat and the Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellites allowing aerosol optical depth (AOD) changes to be tracked throughout a typical convective storm life cycle. Four years of CALIPSO observations suggests that approximately 20% of the dust mass in every 10 degrees longitude band between 10 degrees W and 80 degrees W is deposited into the ocean. Combining a new convective identification algorithm based on hourly geostationary cloud products with AOD(dust) profiles along the CALIPSO track reveals that wet scavenging by convection is responsible for a significant fraction of this deposition across the Atlantic. Composites of 4 years of convective systems reveal that, on average, convection accounts for 15% +/- 7% of the dust deposition in each longitude band relative to preconvective amounts, implying that dry deposition and scavenging by nonconvective events are responsible for the remaining 85% of dust removal. In addition, dust layers are detrained at upper levels of the atmosphere between 8 and 12 km by convective storms across the Atlantic. The dust budget analysis presented here indicates that convection lofts 1.5% +/- 0.6% of dust aerosol mass to altitudes greater than 6 km. This may have significant implications for cloud formation downstream of convection since lofted dust particles can act as effective ice nucleating particles, altering cloud microphysical and radiative properties, latent heating, and precipitation rates. |
英文关键词 | dust aerosols convection satellites |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000493436800001 |
WOS关键词 | AIR LAYER ; MINERAL DUST ; OBSERVATIONAL EVIDENCE ; ATMOSPHERIC TRANSPORT ; OPTICAL-PROPERTIES ; SIZE DISTRIBUTION ; AFRICAN DUST ; CLOUD ; AEROSOL ; ATLANTIC |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | 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/187865 |
专题 | 气候变化 |
作者单位 | 1.Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA; 2.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA; 3.NorthWest Res Associates Inc, Redmond, WA USA; 4.Univ Wisconsin, Cooperat Inst Meteorol Satellite Studies, Madison, WI USA; 5.Univ Wisconsin, Space Sci & Engn Ctr, Madison, WI USA |
推荐引用方式 GB/T 7714 | Sauter, Kathryn,39;Ecuyer, Tristan. The Observed Influence of Tropical Convection on the Saharan Dust Layer[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019. |
APA | Sauter, Kathryn,&39;Ecuyer, Tristan.(2019).The Observed Influence of Tropical Convection on the Saharan Dust Layer.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES. |
MLA | Sauter, Kathryn,et al."The Observed Influence of Tropical Convection on the Saharan Dust Layer".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (2019). |
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