Interannual variation and trend of atmospheric aerosol over the Northern Indian Ocean
Harshbardhan Kumar, Shani Tiwari*
CSIR National Institute of Oceanography
CSIR - National Institute of Oceanography, Dona Paula, Goa, India Pincode: 403004 Mobile: 9451952997 E-mail: firstname.lastname@example.org
Atmospheric aerosols are one of the crucial constituents of atmospheric pollutants and play a vital role in global climate change through the scattering and/or absorption of solar radiation, modification of cloud properties and hence hydrological cycle. Indian ocean is a unique platform for aerosol loading and serves as a natural laboratory to investigate the various aerosol characteristics and their complex interactions. Thus, in order to assess the evolution of aerosol parameters affecting climate change, a long-term trend analysis of aerosol characteristics is highly needed. With this objective, in the present study eighteen years (2003 2020) MODIS (Moderate resolution Imaging Spectroradiometer) derived aerosol parameters over the Northern Indian Ocean have been analyzed. A large spatial variation in aerosol loading is observed, having maximum mean aerosol optical depth (AOD) over the central-east/northern Arabian sea (i.e. AOD>0.52) and northern Bay of Bengal (i.e. AOD>0.56). Relatively higher AOD trend is found near the coastal region of the Indian landmass which is >0.005yr-1, suggesting a significant contribution of aerosol from the Indian subcontinent which is further confirmed by five days airmass back trajectories analysis indicating the importance of long-range transportation over the region. Further details of aerosol characteristics, their interannual variation and decadal scale trend will be discussed during the presentations.