Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Vertical distribution of aerosols and clouds over north-eastern South Asia: Aerosol-cloud interactions
Abstract Eleven years of CALIOP and MODIS data are used to investigate the vertical distribution of aerosols and clouds and their possible interactions over the north-eastern South Asia (22–30°N, 88–98°E). Distinct seasonality in the vertical aerosol structure with the presence of elevated aerosol layers (EALs) is observed. The EALs vary from ~1.4 to 4.8 km in post monsoon to ~4.8–7.4 km in monsoon. Strong convective activities mainly in pre-monsoon and monsoon and upper air transportation of aerosols contribute to the formation of EALs. The contribution of polluted dust, polluted continental/smoke and elevated smoke are found to be predominant in the vertical column during pre-monsoon and monsoon. Contrarily, clean continental, clean marine and dusty marine are dominant during winter and post monsoon. Small spherical particles are abundant during winter while in monsoon hygroscopically grown spherical particles predominate. Seasonally, the cloud occurrence frequency (COF) as a function of altitude is maximum during monsoon. An increase in cloud top height (CTH) is observed within this region corresponding to an increase in number of cloud layers, thus revealing invigoration effect. The occurrence of cirrus and deep convective clouds is maximum in monsoon and minimum in the dry season. Significant inhibition/invigoration is observed for mixed-phase/liquid clouds.
Graphical abstract The vertical distribution and the subtype of aerosols and clouds have been studied over the north-eastern South Asia for June 2006–May 2017 using CALIPSO data. Distinct seasonal features with multiple elevated aerosol layers up to height ~7 km have been observed during monsoon at some locations due the convective overturning of southwest monsoon Walker and Hadley circulation within this region. Cloud occurrence frequency is maximum during the monsoon season. Aerosols invigorate the warm clouds over this region as a result of aerosol-cloud interaction. Display Omitted
Highlights Vertical distribution of aerosols and clouds in north-eastern South Asia examined. Transport and convective activities help form EALs in pre-monsoon and monsoon. Polluted dust and smoke are significantly present during pre-monsoon and monsoon. Cloud top height increases with increase in number of cloud layers. Cirrus and deep convective clouds contribute significantly during monsoon.
Vertical distribution of aerosols and clouds over north-eastern South Asia: Aerosol-cloud interactions
Abstract Eleven years of CALIOP and MODIS data are used to investigate the vertical distribution of aerosols and clouds and their possible interactions over the north-eastern South Asia (22–30°N, 88–98°E). Distinct seasonality in the vertical aerosol structure with the presence of elevated aerosol layers (EALs) is observed. The EALs vary from ~1.4 to 4.8 km in post monsoon to ~4.8–7.4 km in monsoon. Strong convective activities mainly in pre-monsoon and monsoon and upper air transportation of aerosols contribute to the formation of EALs. The contribution of polluted dust, polluted continental/smoke and elevated smoke are found to be predominant in the vertical column during pre-monsoon and monsoon. Contrarily, clean continental, clean marine and dusty marine are dominant during winter and post monsoon. Small spherical particles are abundant during winter while in monsoon hygroscopically grown spherical particles predominate. Seasonally, the cloud occurrence frequency (COF) as a function of altitude is maximum during monsoon. An increase in cloud top height (CTH) is observed within this region corresponding to an increase in number of cloud layers, thus revealing invigoration effect. The occurrence of cirrus and deep convective clouds is maximum in monsoon and minimum in the dry season. Significant inhibition/invigoration is observed for mixed-phase/liquid clouds.
Graphical abstract The vertical distribution and the subtype of aerosols and clouds have been studied over the north-eastern South Asia for June 2006–May 2017 using CALIPSO data. Distinct seasonal features with multiple elevated aerosol layers up to height ~7 km have been observed during monsoon at some locations due the convective overturning of southwest monsoon Walker and Hadley circulation within this region. Cloud occurrence frequency is maximum during the monsoon season. Aerosols invigorate the warm clouds over this region as a result of aerosol-cloud interaction. Display Omitted
Highlights Vertical distribution of aerosols and clouds in north-eastern South Asia examined. Transport and convective activities help form EALs in pre-monsoon and monsoon. Polluted dust and smoke are significantly present during pre-monsoon and monsoon. Cloud top height increases with increase in number of cloud layers. Cirrus and deep convective clouds contribute significantly during monsoon.
Vertical distribution of aerosols and clouds over north-eastern South Asia: Aerosol-cloud interactions
Dahutia, Papori (Autor:in) / Pathak, Binita (Autor:in) / Bhuyan, Pradip Kumar (Autor:in)
Atmospheric Environment ; 215
02.08.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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