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Impacts of aerosols on seasonal precipitation and snowpack in California based on convection-permitting WRF-Chem simulations

Title
Impacts of aerosols on seasonal precipitation and snowpack in California based on convection-permitting WRF-Chem simulations
Authors
Wu, LongtaoGu, YuJiang, Jonathan H.Su, HuiYu, NanpengZhao, ChunQian, YunZhao, BinLiou, Kuo-NanChoi, Yong-Sang
Ewha Authors
최용상
SCOPUS Author ID
최용상scopus
Issue Date
2018
Journal Title
ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN
1680-7316JCR Link1680-7324JCR Link
Citation
vol. 18, no. 8, pp. 5529 - 5547
Publisher
COPERNICUS GESELLSCHAFT MBH
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A version of the WRF-Chem model with fully coupled aerosol-meteorology-snowpack is employed to investigate the impacts of various aerosol sources on precipitation and snowpack in California. In particular, the impacts of locally emitted anthropogenic and dust aerosols, and aerosols transported from outside California are studied. We differentiate three pathways of aerosol effects: aerosol-radiation interaction (ARI), aerosol-snow interaction (ASI), and aerosol-cloud interaction (ACI). The convection-permitting model simulations show that precipitation, snow water equivalent (SWE), and surface air temperature averaged over the whole domain (34-42 degrees N, 117-124 degrees W, not including ocean points) are reduced when aerosols are included, therefore reducing large biases in these variables due to the absence of aerosol effects in the model. Aerosols affect California water resources through the warming of mountaintops and the reduction of precipitation; however, different aerosol sources play different roles in changing surface temperature, precipitation, and snowpack in California by means of various weights of the three pathways. ARI by all aerosols mainly cools the surface, leading to slightly increased SWE over the mountains. Locally emitted dust aerosols warm the surface of mountaintops through ASI, in which the reduced snow albedo associated with dusty snow leads to more surface absorption of solar radiation and reduced SWE. Transported aerosols and local anthropogenic aerosols play a dominant role in increasing nonprecipitating clouds but reducing precipitation through ACI, leading to reduced SWE and runoff on the Sierra Nevada, as well as the warming of mountaintops associated with decreased SWE and hence lower surface albedo. The average changes in surface temperature from October 2012 to June 2013 are about -0.19 and 0.22 K for the whole domain and over mountaintops, respectively. Overall, the averaged reduction during October to June is about 7% for precipitation, 3% for SWE, and 7% for surface runoff for the whole domain, while the corresponding numbers are 12, 10, and 10% for the mountaintops. The reduction in SWE is more significant in a dry year, with 9% for the whole domain and 16% for the mountaintops. The maximum reduction of similar to 20% in precipitation occurs in May and is associated with the maximum aerosol loading, leading to the largest decrease in SWE and surface runoff over that period. It is also found that dust aerosols can cause early snowmelt on the mountaintops and reduced surface runoff after April.
DOI
10.5194/acp-18-5529-2018
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엘텍공과대학 > 환경공학전공 > Journal papers
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