Journal ArticleDOI
Flood or drought: How do aerosols affect precipitation?
Daniel Rosenfeld,Ulrike Lohmann,Graciela B. Raga,Colin D. O'Dowd,Markku Kulmala,Sandro Fuzzi,Anni Reissell,Meinrat O. Andreae +7 more
TLDR
A conceptual model is proposed that explains this apparent dichotomy of pristine tropical clouds with low CCN concentrations rain out too quickly to mature into long-lived clouds and heavily polluted clouds evaporate much of their water before precipitation can occur.Abstract:
Aerosols serve as cloud condensation nuclei (CCN) and thus have a substantial effect on cloud properties and the initiation of precipitation. Large concentrations of human-made aerosols have been reported to both decrease and increase rainfall as a result of their radiative and CCN activities. At one extreme, pristine tropical clouds with low CCN concentrations rain out too quickly to mature into long-lived clouds. On the other hand, heavily polluted clouds evaporate much of their water before precipitation can occur, if they can form at all given the reduced surface heating resulting from the aerosol haze layer. We propose a conceptual model that explains this apparent dichotomy.read more
Citations
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Journal ArticleDOI
Role of interactions between cloud microphysics, dynamics and aerosol in the heavy rainfall event of June 2013 over Uttarakhand, India
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Microphysical characteristics of clouds and precipitation during pre-monsoon and monsoon period over a tropical Indian station
TL;DR: In this article, the authors examined the characteristics of clouds and precipitation during the pre-monsoon (PM) and monsoon months (MM) over the tropical station Kolkata (22.65°N, 88.45°E), which is located in the eastern part of India.
Journal ArticleDOI
Semi-empirical parameterization of size-dependent atmospheric nanoparticle growth in continental environments
Sak A. K. Häkkinen,He E. Manninen,He E. Manninen,Taina Yli-Juuti,Joonas Merikanto,Mk K. Kajos,Tuomo Nieminen,Tuomo Nieminen,Sd D. D'Andrea,Sd D. D'Andrea,Ari Asmi,Jeffrey R. Pierce,Jeffrey R. Pierce,Markku Kulmala,Ilona Riipinen,Ilona Riipinen +15 more
TL;DR: In this paper, a simple semi-empirical parameterization for sub-20 nm particle growth that distributes secondary organics to the nanoparticles according to their size and is therefore able to reproduce particle growth observed in the atmosphere is presented.
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Numerical simulation of clouds and precipitation depending on different relationships between aerosol and cloud droplet spectral dispersion
TL;DR: In this paper, the authors investigated the aerosol effects on clouds and precipitation in deep convective cloud systems using the Weather Research and Forecast (WRF) model with the Morrison two-moment bulk microphysics scheme.
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Long-term Atmospheric Visibility, Sunshine Duration and Precipitation Trends in South China
TL;DR: In this article, the spatial and temporal trends of atmospheric visibility, sunshine duration and precipitation in recent years in the region to understand how aerosols affect the environment were analyzed using several different statistical methods.
References
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TL;DR: PfPMP1)与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作�ly.
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Aerosols, climate, and the hydrological cycle
TL;DR: Human activities are releasing tiny particles (aerosols) into the atmosphere that enhance scattering and absorption of solar radiation, which can lead to a weaker hydrological cycle, which connects directly to availability and quality of fresh water, a major environmental issue of the 21st century.
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Global indirect aerosol effects: a review
Ulrike Lohmann,Johann Feichter +1 more
TL;DR: In this article, the effects of aerosols on the climate system are discussed and different approaches how the climatic implications of these effects can be estimated globally as well as improvements that are needed in global climate models in order to better represent indirect aerosol effects are discussed.
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Climate Effects of Black Carbon Aerosols in China and India
TL;DR: A global climate model used to investigate possible aerosol contributions to trends in China and India found precipitation and temperature changes in the model that were comparable to those observed if the aerosols included a large proportion of absorbing black carbon (“soot”), similar to observed amounts.
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Inaugural Article by a Recently Elected Academy Member
Jian Xu,Jeffrey I. Gordon +1 more