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Aerosol Direct Radiative and Cloud A...

Song, Yangyang.

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Aerosol Direct Radiative and Cloud Adjustment Effects on Surface Climate over the Eastern China: Analyses of WRF Model Simulations.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Aerosol Direct Radiative and Cloud Adjustment Effects on Surface Climate over the Eastern China: Analyses of WRF Model Simulations./
作者:	Song, Yangyang.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	133 p.
附註:	Source: Dissertations Abstracts International, Volume: 79-11, Section: B.
Contained By:	Dissertations Abstracts International79-11B.
標題:	Asian Studies. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10787213
ISBN:	9780355869330

Aerosol Direct Radiative and Cloud Adjustment Effects on Surface Climate over the Eastern China: Analyses of WRF Model Simulations.
Song, Yangyang.

Aerosol Direct Radiative and Cloud Adjustment Effects on Surface Climate over the Eastern China: Analyses of WRF Model Simulations. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 133 p.

Source: Dissertations Abstracts International, Volume: 79-11, Section: B.

Thesis (Ph.D.)--State University of New York at Albany, 2018.

This item must not be sold to any third party vendors.

Aerosol climate effects consist of the initial forcing of atmospheric radiation perturbation through both the direct radiative effect and the modulation of radiatively-important cloud microphysics, and the subsequent changes in meteorology that also affect cloud macro- and micro-physics. The aerosol-induced cloud adjustment therefore involves many couplings and interactions, and its quantitative evaluation requires the use of model simulations. This study uses WRF model simulated changes in clouds and meteorology due to anthropogenic aerosol increases (versus 1970s) for 2002-2008 summers over the eastern China to address two relevant issues: direct radiative vs. cloud adjustment effects, and their roles in affecting surface climate. The first issue is addressed by comparing offline calculated radiation perturbations by aerosol-radiation (AR) and aerosol-cloud-radiation (ACR) interactions, and the second by analyzing the surface energy balance, temperature and precipitation. The increases of aerosol optical depth (AOD) averaged over the eastern China range from 0.18 (2004) to 0.26 (2007), and the calculated means/standard deviations of surface AR and ACR forcing are -6.7/0.58 and -3.5/0.63 W m-2, respectively. The model simulated mean surface cooling is 0.35 °C, dominated by AR and ACR with a positive (cooling) feedback due to changes in meteorology (~10%), and two negative (warming) feedbacks due to decreases in latent (~70%) and sensible (~20%) heat fluxes. The total precipitation is decreased by 8%. The spatial characteristics of surface climate changes are analyzed using ensemble simulations of the year-2008 (0.25 AOD), and the changes are found to be sensitive to climate regimes. In the Jing-Jin-Ji area (0.63 AOD) located at the north of western North-Pacific subtropical high (WNPSH), AR (-16.1 W m-2) dominates over ACR (-1.5 W m-2 ). In Sichuan basin (0.31 AOD) located at the northwest of WNPSH, ACR (-8.8 W m-2) becomes equally important as AR (-8.6 W m-2) because of increases in clouds (fraction and water) caused by increased water vapor associated with anomalous convergent flows. For both regions, decreases in surface heat fluxes provide significant negative feedbacks and the surface is cooled by 0.43 and 0.51 °C, respectively. However, in the middle Yangtze River valley (0.26 AOD) where the WNPSH occupies, despite the AR (-8.1 W m-2) cooling, the surface is warmed by 0.17 °C for two reasons: the ACR warming (+0.2 W m -2) due to decreases in clouds caused by less water vapor and anomalous divergent flows, and the strong negative feedback from decrease in latent heat (-12.3 W m-2) caused by a drier surface due to decreased rainfall. Changes in precipitation characteristics also show strong regional variations that are associated with cloud changes. This study illustrates that ACR is a useful diagnostic parameter to unravel the complexity of climate change to aerosol forcing over eastern China.

ISBN: 9780355869330Subjects--Topical Terms:

1669375
Asian Studies.
Subjects--Index Terms:

Aerosol-climate interaction

Aerosol Direct Radiative and Cloud Adjustment Effects on Surface Climate over the Eastern China: Analyses of WRF Model Simulations.
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