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    Elevated acidification rates due to deposition of atmospheric pollutants in the coastal Bay of Bengal

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    Geophy_Res_Lett_48_e2021GL095159a.pdf (1.820Mb)
    Date
    2021
    Author
    Sarma, V.V.S.S.
    Krishna, M.S.
    Srinivas, T.N.R.
    Kumari, V.R.
    Yadav, K.
    Kumar, M.D.
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    Abstract
    Human inputs of pollutants to the atmosphere and subsequent deposition may decrease pH in the coastal waters. Significant rate of decrease in pH and increase in pCO2 by 3-5 times is noticed in the coastal Bay of Bengal (BoB) than the low-latitude global ocean trends in the last few decades. We provide evidence for the first time for a rapid decrease in surface water pH due to atmospheric deposition of pollutants in the coastal BoB. The decrease in pH in the coastal BoB over the last decade is associated with concomitant increase in aerosol optical depth (AOD), total suspended particles (TSP) in air, sulfate and nitrate concentrations in TSP. This study suggests that contamination of surface coastal BoB by atmospheric pollutants not only acidifies surface ocean but also potentially amplifies CO2 emission with immediate implications to regional weather and climate.
    URI
    https://doi.org/10.1029/2021GL095159
    https://drs.nio.org/drs/handle/2264/8727
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