Effects of anthropogenic and sea salt aerosols on a heavy rainfall event during the early-summer rainy season over coastal Southern China
Effects of anthropogenic and sea salt aerosols on a heavy rainfall event during the early-summer rainy season over coastal Southern China
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DOI：
10.1016/j.atmosres.2021.105923
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发表时间：
2021-11
影响因子：
5.5
通讯作者：
Hengchi Lei
中科院分区：
文献类型：
--
作者：
Jiaxu Guo;Yali Luo;Jiefan Yang;Kalli Furtado;Hengchi Lei
人为和海盐气溶胶（AA和SSA，分别）在人口稠密的季风沿海地区的强降雨的影响仍然知之甚少。为了解决这个问题，一个有代表性的暴雨过程中，中国南方沿海地区的天气研究和预报模式耦合化学（WRF-Chem）进行了模拟。结果表明，由于AA和SSA的尺度分布不同，云对它们的初始响应是相反的：当AA发射量增加10倍时，混合比和云滴数浓度（QcandNc）随尺度减小而增大;与此相反，SSA的存在会导致云滴变小但变大，因为较小的气溶胶的激活被抑制在105至106 m − 3的数量级，这是由于增加了SSA与其他较小粒子作为云凝结核竞争过饱和水汽。在污染环境中，由于云滴向雨滴的自动转换减弱，降雨数浓度（Nr）降低到清洁环境的一半左右。Nr的减小加上雨滴对云滴的吸积作用增强，导致雨滴的平均尺寸增大，平均下落速度加快，因此地面小时雨率的概率分布向> 2 mm h−1的值移动。24小时降水累积量在中心增加到约80毫米，虽然区域平均量仅增加5.32%。同时，增加AA的排放量减少总的混合比的冰相水凝物，而以前报道的对流增强是不明显的。当SSA排放被包括在污染的环境中，显着抑制激活的亚微米气溶胶导致以下的液体，混合和冰相微物理过程和对流强度在一定程度上减弱。小时降雨率的概率分布向<5 mm h−1的值移动，而24 h降雨累积量几乎没有显著变化，区域平均降雨量减少了4.19%。气溶胶，特别是SSA的整体小的影响，在这种情况下，强天气强迫管理的暴雨生产。
Effects of anthropogenic and sea salt aerosols (AA and SSA, respectively) on heavy rainfall in the densely populated monsoon coastal areas remain poorly known. To address this issue, a representative heavy rainfall event over coastal Southern China is simulated using the Weather Research and Forecasting model coupled to Chemistry (WRF-Chem). Results show that the initial responses of clouds to AA and SSA are opposite due to their different size distributions: increasing the AA emission by tenfold leads to larger mixing ratio and number concentration of cloud droplets (QcandNc) with reduced size; on the contrary, presence of SSA results in less but larger cloud droplets as activation of smaller aerosols is inhibited on the order of 105to 106m−3due to increased competition for the supersaturated water vapor between SSA and other smaller particles as cloud condensation nuclei. In the polluted environment, rain number concentration (Nr) is reduced to about a half of that in the clean environment due to weakened auto-conversion from cloud droplets to raindrops. The reducedNrcombined with enhanced accretion of cloud droplets by raindrops result in larger mean size and faster mean fall speed of raindrops, therefore probability distribution of surface hourly rain rate shifts toward values > about 2 mm h−1. The 24-h rainfall accumulation increases up to about 80 mm at the centers, although the region-averaged amount increases only 5.32%. Meanwhile, increasing the AA emission decreases total mixing ratio of ice-phase hydrometeors while the previously reported convective intensification is not evident. When the SSA emission is included in the polluted environment, the significantly inhibited activation of submicron aerosols leads to weakening of the following liquid-, mixed-, and ice-phase microphysical processes and the convective intensity to some extents. The probability distribution of hourly rain rates shifts toward values < about 5 mm h−1, while the 24-h rainfall accumulation hardly changes significantly with a decrease of 4.19% in the regionally averaged amount. The overall small impacts of aerosols, SSA in particular, are related to the strong synoptic forcing governing the heavy rainfall production in this case.
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影响因子：
6.3
作者：
Grythe, H.;Strom, J.;Stohl, A.
通讯作者：
Stohl, A.
当地和远程人为气溶胶对中国广东省破纪录暴雨事件的贡献
影响因子：
6.3
作者：
Liu Zhen;Ming Yi;Zhao Chun;Lau Ngar Cheung;Guo Jianping;Bollasina Massimo;Yim Steve Hung Lam
通讯作者：
Yim Steve Hung Lam
影响因子：
6.3
作者：
de Leeuw, Gerrit;Sogacheva, Larisa;van der A, Ronald
通讯作者：
van der A, Ronald
DOI：
10.1002/2015jd023743
发表时间：
2015-09
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
Amanda Sheffield;S. Saleeby;S. C. Heever
通讯作者：
Amanda Sheffield;S. Saleeby;S. C. Heever
影响因子：
6.3
作者：
Yuan Wang;Q. Wan;W. Meng;F. Liao;H. Tan;Renyi Zhang
通讯作者：
Yuan Wang;Q. Wan;W. Meng;F. Liao;H. Tan;Renyi Zhang