Aerosol and cloud droplet characteristics over Ganges Valley during break phase of monsoon: A case study
Autor: | A.S. Anu, Pramod D. Safai, Palani Murugavel, Mercy Varghese, R. Vishnu, Gurnule Dinesh, K. Nandakumar, E.A. Resmi, Y. Bhavani Kumar, Thara V. Prabha, Sathy Nair, Y. Jaya Rao, Baban Nagare |
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Rok vydání: | 2019 |
Předmět: |
Atmospheric Science
Haze 010504 meteorology & atmospheric sciences Single particle analysis 010501 environmental sciences Entrainment (meteorology) Atmospheric sciences 01 natural sciences Aerosol Atmosphere Boundary layer Particle Environmental science Precipitation Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences |
Zdroj: | Atmospheric Research. 220:125-140 |
ISSN: | 0169-8095 |
Popis: | Unique airborne observations made ≅330 km south of Mt. Everest during the Cloud-Aerosol Interaction Precipitation Enhancement EXperiment (CAIPEEX) 2014 are presented in this case study. These observations provide the vertical profile and elemental composition of aerosols from single particle analysis during the break period. An “aerosol dome” was also documented from the horizontal transect across the Varanasi city. The boundary layer was dominated by light scattering fine mode aerosols mainly a mixture of dust and pollution. The individual particle characterization revealed complex mixing states within the same aerosol aggregate. Externally mixed aerosols were present at the cloud bases. Elemental composition of aerosol particles collected from free atmosphere contained signatures of aged pollution with heavy metals, carbonaceous particles and radioactive elements. Cloud processed aerosols were also noted in the neighborhood of deep convective clouds. Shallow and deep cumulus clouds developing in the haze layer revealed distinct dropsize distributions. Shallow cumulus clouds embedded in the haze layer showed narrow droplet size distribution and were narrower than the ones observed for premonsoon conditions. Deep cumulus tops in the neighborhood of rapidly developing convection showed broad, bimodal droplet size distribution attributing to droplet evaporation and entrainment effects. Aerosol sampling near these cloud tops showed aggregates of particles that are internally mixed. |
Databáze: | OpenAIRE |
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