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
More filters
Reference EntryDOI
Aerosols and Their Impact on Radiation, Clouds, Precipitation, and Severe Weather Events
TL;DR: In this article, two dominant mechanisms by which aerosols affect weather and climate: aerosol-radiation interactions (ARIs) and aerosolcloud interactions (ACIs) are discussed.
Journal ArticleDOI
Spectral width of premonsoon and monsoon clouds over Indo‐Gangetic valley
Thara V. Prabha,Sachin Patade,Govindan Pandithurai,A. P. Khain,Duncan Axisa,P. Pradeep-Kumar,R. S. Maheshkumar,J. R. Kulkarni,Bhupendra Nath Goswami +8 more
TL;DR: In this article, the spectral width in polluted, dry premonsoon conditions and moist monsoon conditions observed near the Himalayan Foothills region during Cloud Aerosol Interaction and Precipitation Enhancement EXperiment (CAIPEEX) was studied.
Journal ArticleDOI
Long-term observations of cloud condensation nuclei over the Amazon rain forest – Part 2: Variability and characteristics of biomass burning, long-range transport, and pristine rain forest aerosols
Mira L. Pöhlker,Florian Ditas,Jorge Saturno,Jorge Saturno,Thomas Klimach,Isabella Hrabě de Angelis,Alessandro Araújo,Joel Brito,Joel Brito,Samara Carbone,Yafang Cheng,Xuguang Chi,Xuguang Chi,Reiner Ditz,Sachin S. Gunthe,Bruna A. Holanda,Konrad Kandler,Jürgen Kesselmeier,Tobias Könemann,Ovid O. Krüger,Jost V. Lavric,Scot T. Martin,Eugene Mikhailov,Daniel Moran-Zuloaga,Luciana V. Rizzo,Diana Rose,Hang Su,Ryan Thalman,Ryan Thalman,David Walter,Jian Wang,Stefan Wolff,Henrique M. J. Barbosa,Paulo Artaxo,Meinrat O. Andreae,Meinrat O. Andreae,Ulrich Pöschl,Christopher Pöhlker +37 more
TL;DR: Pohlker et al. as mentioned in this paper analyzed key features and implications of aerosol and cloud condensation properties for the following characteristic atmospheric conditions: empirically pristine rain forest (PR) conditions, where no influence of pollution was detectable, as observed during parts of the wet season from March to May.
Journal ArticleDOI
Observations of aerosol‐induced convective invigoration in the tropical east Atlantic
TL;DR: In this article, four years of CloudSat data have been analyzed over a region of the east Atlantic Ocean in order to examine the influence of aerosols on deep convection, showing that convective invigoration occurs with increased aerosol loading, leading to deeper, stronger storms in polluted environments.
Journal ArticleDOI
Large unexplained suite of chemically reactive compounds present in ambient air due to biomass fires.
TL;DR: Increased missing OH reactivity between the two summertime periods was associated with increased concentrations of compounds with strong photochemical source such as acetaldehyde, acetone, hydroxyacetone, nitromethane, amides, isocyanic acid and primary emissions of acetonitrile and aromatic compounds.
References
More filters
疟原虫var基因转换速率变化导致抗原变异[英]/Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
Inaugural Article by a Recently Elected Academy Member
Jian Xu,Jeffrey I. Gordon +1 more