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    What is driving the diurnal variation in tropospheric NO2 columns over a cluster of high emission thermal power plants in India?

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    Type
    Article
    Authors
    Ghude, Sachin D.
    Karumuri, Rama Krishna
    Jena, Chinmay
    Kulkarni, Rachana
    Pfister, G. G.
    Sajjan, Veeresh S.
    Pithani, Prakash
    Debnath, Sreyashi
    Kumar, Rajesh
    Upendra, B.
    Kulkarni, Santosh H.
    Lal, D. M.
    Vander A, R. J.
    Mahajan, Anoop S.
    KAUST Department
    King Abdullah University of Science and,Technology, Thuwal, Saudi Arabia
    Date
    2019-11-23
    Online Publication Date
    2019-11-23
    Print Publication Date
    2020-01
    Submitted Date
    2019-03-18
    Permanent link to this record
    http://hdl.handle.net/10754/661490
    
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    Abstract
    We investigated the diurnal variation of tropospheric nitrogen dioxide (NO2) over a cluster of high emission thermal power plants (HETPPs) in India using two products from satellite-based UV/Visible spectrometers together with a chemistry-transport-model. The different overpass times of the satellite spectrometers: SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) (1030 h LT) and Ozone Monitoring Instrument (OMI) (1330 h LT)), enable detection of changes in NO2 columns at two different times of the day, providing some insight on its diurnal variation. Observations show elevated tropospheric NO2 columns in the afternoon compared to the morning in the vicinity of the HETPPs (~65% higher), contrary to the expected decrease due to enhanced photochemical loss of NO2 in the afternoon and increased concentrations in the morning due to peak-hour vehicular emissions. The observed diurnal variability was simulated using a regional atmospheric composition model and the deviations in nitrogen oxide (NO), NO2, ozone (O3) and hydroperoxy radical (HO2) between 1030 h and 1330 h within the planetary boundary layer (PBL) were examined. We also examined the vertical and horizontal accumulated tendencies of NO2 (advection) and wind profiles directly over the emission. The results show that the vertical variability of chemical loss processes, driven by a change in vertical mixing of NO2 within the PBL and variability in advection (driven by winds) leads to a net increase in the afternoon NO2 columns over the HETPPs, even if we assume flat emissions throughout the day. These results suggest that meteorology along with PBL evolution affects the diurnal evolution of NO2 columnar abundance over locations with high emissions in India.
    Citation
    Ghude, S. D., Karumuri, R. K., Jena, C., Kulkarni, R., Pfister, G. G., Sajjan, V. S., … Mahajan, A. S. (2019). What is driving the diurnal variation in tropospheric NO2 columns over a cluster of high emission thermal power plants in India? Atmospheric Environment: X, 100058. doi:10.1016/j.aeaoa.2019.100058
    Sponsors
    We thank the Ministry of Earth Sciences, India for their support. We are grateful to TEMIS (http://www.temis.nl/airpollution/no2.html) making the satellite data used here available. All WRF-Chem model simulations were carried out at IITM, India on the IBM-HPC system ‘Aditya’.
    Publisher
    Elsevier BV
    Journal
    Atmospheric Environment: X
    DOI
    10.1016/j.aeaoa.2019.100058
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S2590162119300619
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.aeaoa.2019.100058
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