Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-12161-2018 |
Investigating the impacts of Saharan dust on tropical deep convection using spectral bin microphysics | |
Gibbons, Matthew1; Min, Qilong1; Fan, Jiwen2 | |
2018-08-23 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:16页码:12161-12184 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | To better understand the impacts of dust aerosols on deep convective cloud (DCC) systems reported by previous observational studies, a case study in the tropical eastern Atlantic was investigated using the Weather Research and Forecasting (WRF) model coupled with a spectral bin microphysics (SBM) model. A detailed set of ice nucleation parameterizations linking ice formation with aerosol particles has been implemented in the SBM. Increasing ice nuclei (IN) concentration in the dust cases results in the formation of more numerous small ice particles in the heterogeneous nucleation regime (between -5 and -38 degrees C) compared to the background ("Clean") case. Convective updrafts are invigorated by increased latent heat release due to depositional growth and riming of these more numerous particles, which results in increased overshooting and higher convective core top heights. Competition between the more numerous particles for available water vapor during diffusional growth and available smaller crystals and/or drops during collection reduces particle growth rates and shifts precipitation formation to higher altitudes in the heterogeneous nucleation regime. A greater number of large snow particles form in the dust cases, which are transported from the core into the stratiform regime and sediment out quickly. Together with reduced homogeneous ice formation, the stratiform and/or anvil cloud occurrence shifts frequency to warmer temperatures and reduces anvil cloud extents. Total surface precipitation accumulation is reduced proportionally as IN concentration is increased; though the stratiform precipitation accumulation is increased due to greater snow formation and growth, it does not counteract the reduced convective accumulation due to less efficient graupel formation. Radar reflectivity values are increased in the dust cases at temperatures below 0 degrees C in both the convective and stratiform regimes due to more large snow particles, and reduced in the convective core near the surface due to melt of small ice or graupel particles, consistent with case study observations. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000442521800001 |
WOS关键词 | AEROSOL-CLOUD INTERACTIONS ; ATMOSPHERIC ICE NUCLEI ; MINERAL DUST ; NUMERICAL-SIMULATION ; AIR LAYER ; RADAR REFLECTIVITY ; PART II ; NUCLEATION ; MODEL ; PRECIPITATION |
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/29443 |
专题 | 地球科学 |
作者单位 | 1.SUNY Albany, Atmospher Sci Res Ctr, Albany, NY 12203 USA; 2.Pacific Northwest Natl Lab, Earth Syst Anal & Modeling, Richland, WA 99352 USA |
推荐引用方式 GB/T 7714 | Gibbons, Matthew,Min, Qilong,Fan, Jiwen. Investigating the impacts of Saharan dust on tropical deep convection using spectral bin microphysics[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(16):12161-12184. |
APA | Gibbons, Matthew,Min, Qilong,&Fan, Jiwen.(2018).Investigating the impacts of Saharan dust on tropical deep convection using spectral bin microphysics.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(16),12161-12184. |
MLA | Gibbons, Matthew,et al."Investigating the impacts of Saharan dust on tropical deep convection using spectral bin microphysics".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.16(2018):12161-12184. |
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