Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD026535 |
The Influence of Aerosol Hygroscopicity on Precipitation Intensity During a Mesoscale Convective Event | |
Kawecki, Stacey; Steiner, Allison L. | |
2018-01-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:1页码:424-442 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We examine how aerosol composition affects precipitation intensity using the Weather and Research Forecasting Model with Chemistry (version 3.6). By changing the prescribed default hygroscopicity values to updated values from laboratory studies, we test model assumptions about individual component hygroscopicity values of ammonium, sulfate, nitrate, and organic species. We compare a baseline simulation (BASE, using default hygroscopicity values) with four sensitivity simulations (SULF, increasing the sulfate hygroscopicity; ORG, decreasing organic hygroscopicity; SWITCH, using a concentration-dependent hygroscopicity value for ammonium; and ALL, including all three changes) to understand the role of aerosol composition on precipitation during a mesoscale convective system (MCS). Overall, the hygroscopicity changes influence the spatial patterns of precipitation and the intensity. Focusing on the maximum precipitation in the model domain downwind of an urban area, we find that changing the individual component hygroscopicities leads to bulk hygroscopicity changes, especially in the ORG simulation. Reducing bulk hygroscopicity (e.g., ORG simulation) initially causes fewer activated drops, weakened updrafts in the midtroposphere, and increased precipitation from larger hydrometeors. Increasing bulk hygroscopicity (e.g., SULF simulation) simulates more numerous and smaller cloud drops and increases precipitation. In the ALL simulation, a stronger cold pool and downdrafts lead to precipitation suppression later in the MCS evolution. In this downwind region, the combined changes in hygroscopicity (ALL) reduces the overprediction of intense events (>70 mm d(-1)) and better captures the range of moderate intensity (30-60 mm d(-1)) events. The results of this single MCS analysis suggest that aerosol composition can play an important role in simulating high-intensity precipitation events. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423433500024 |
WOS关键词 | CLOUD CONDENSATION NUCLEI ; ORGANIC AEROSOL ; UNITED-STATES ; PART I ; MODEL ; TRENDS ; ACTIVATION ; CHEMISTRY ; WEATHER ; IMPACTS |
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/32346 |
专题 | 气候变化 |
作者单位 | Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA |
推荐引用方式 GB/T 7714 | Kawecki, Stacey,Steiner, Allison L.. The Influence of Aerosol Hygroscopicity on Precipitation Intensity During a Mesoscale Convective Event[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(1):424-442. |
APA | Kawecki, Stacey,&Steiner, Allison L..(2018).The Influence of Aerosol Hygroscopicity on Precipitation Intensity During a Mesoscale Convective Event.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(1),424-442. |
MLA | Kawecki, Stacey,et al."The Influence of Aerosol Hygroscopicity on Precipitation Intensity During a Mesoscale Convective Event".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.1(2018):424-442. |
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