Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD026933 |
Saharan dust, convective lofting, aerosol enhancement zones, and potential impacts on ice nucleation in the tropical upper troposphere | |
Twohy, C. H.1; 39;Ecuyer, T. S.2 | |
2017-08-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
![]() |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:16 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Dry aerosol size distributions and scattering coefficients were measured on 10 flights in 32 clear-air regions adjacent to tropical storm anvils over the eastern Atlantic Ocean. Aerosol properties in these regions were compared with those from background air in the upper troposphere at least 40 km from clouds. Median values for aerosol scattering coefficient and particle number concentration >0.3 mu m diameter were higher at the anvil edges than in background air, showing that convective clouds loft particles from the lower troposphere to the upper troposphere. These differences are statistically significant. The aerosol enhancement zones extended similar to 0-15 km horizontally and similar to 0.25 km vertically below anvil cloud edges but were not due to hygroscopic growth since particles were measured under dry conditions. Number concentrations of particles >0.3 mu m diameter were enhanced more for the cases where Saharan dust layers were identified below the clouds with airborne lidar. Median number concentrations in this size range increased from similar to 100 l(-1) in background air to similar to 400 l(-1) adjacent to cloud edges with dust below, with larger enhancements for stronger storm systems. Integration with satellite cloud frequency data indicates that this transfer of large particles from low to high altitudes by convection has little impact on dust concentrations within the Saharan Air Layer itself. However, it can lead to substantial enhancement in large dust particles and, therefore, heterogeneous ice nuclei in the upper troposphere over the Atlantic. This may induce a cloud/aerosol feedback effect that could impact cloud properties in the region and downwind. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416382800026 |
WOS关键词 | CIRRUS CLOUD FORMATION ; MINERAL DUST ; AFRICAN DUST ; DESERT DUST ; PART I ; OPTICAL-PROPERTIES ; EASTERN ATLANTIC ; DEEP CONVECTION ; CUMULUS CLOUDS ; ANVIL CIRRUS |
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/32779 |
专题 | 气候变化 |
作者单位 | 1.Northwest Res Associates, Redmond, WA 98052 USA; 2.NASA, Langley Res Ctr, Hampton, VA 23665 USA; 3.Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI USA; 4.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA; 5.Natl Ctr Atmospher Res, Microscale & Mesoscale Meteorol Lab, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Twohy, C. H.,39;Ecuyer, T. S.. Saharan dust, convective lofting, aerosol enhancement zones, and potential impacts on ice nucleation in the tropical upper troposphere[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(16). |
APA | Twohy, C. H.,&39;Ecuyer, T. S..(2017).Saharan dust, convective lofting, aerosol enhancement zones, and potential impacts on ice nucleation in the tropical upper troposphere.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(16). |
MLA | Twohy, C. H.,et al."Saharan dust, convective lofting, aerosol enhancement zones, and potential impacts on ice nucleation in the tropical upper troposphere".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.16(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论