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Impact of tropical convection and ENSO variability in vertical distributions of CO and O3 over an urban site of India

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Abstract

This study is based on the analysis of the measurement of ozone and water vapor by airbus in-service aircraft (MOZAIC) data of vertical ozone (O3) and carbon monoxide (CO) over Hyderabad during November 2005–March 2009. Measurements in the upper troposphere show highest values of O3 (53–75 ppbv) and CO (80–110 ppbv) during the pre-monsoon and post-monsoon seasons, respectively. The episodes of strong wind shears (>20 ms−1) were frequent during the monsoon/post-monsoon months, while weak shear conditions (<10 ms−1) were prevalent during the winter season. The profiles of both O3 and CO measured under southerly winds showed lower values than under northerly winds in each season. The strong and weak wind shears over the study region were associated with the El Niño and La Niña conditions, respectively. The outgoing long-wave radiation (OLR) and wind shear data indicate enhancement in the convective activity from monsoon to post-monsoon period. Higher levels of O3 were measured under the strong shear conditions, while CO and H2O show enhancements under weak shear conditions. The near surface observation and simulations show increase of O3 with increasing OLR, while insignificant relation in the upper region. In case of CO, the MOZAIC and CCM2 show weaker dependence while MOZART-4 shows rapid increase with OLR indicating large overestimation of convective transport. A modified Tiedtke convective scheme provides better representation compared to the Hack/Zhang-McFarlane schemes for both O3 and CO during the monsoon season. The difference between observation and simulations were particularly large during transition from El Niño to La Niña phases. The different convection scheme and horizontal resolution in the MOZART-4 and CCM2 seem to be the major causes of disagreement between these models. Vertical profiles of both O3 and CO during extreme events such a tropical cyclones (TCs) show strong influence of the convective-dynamics over Bay of Bengal (BOB).

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Acknowledgments

We are thankful to the European Commission, Airbus, CNRS-France, FZJ-Germany and the airlines (Lufthansa, Air France, Austrian and former Sabena who carry free of charge the MOZAIC instrumentation since 1994). We are also thankful to the University of Wyoming for providing the vertical profiles of met data over Hyderabad. The data used in the present study is available with Dr. Lokesh Kumar Sahu (Email: lokesh@prl.res.in).

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Author notes

  1. P. R. Sinha

    Present address: Department of Earth and Planetary Science, University of Tokyo, Tokyo, 113-0033, Japan

Authors and Affiliations

  1. Physical Research Laboratory (PRL), Navrangpura, Ahmedabad, 380009, India

    L. K. Sahu, Varun Sheel, Ravi Yadav & Devendra Pal

  2. Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan

    M. Kajino & M. Deushi

  3. Environmental and Water Resources Engineering Division, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    Sachin S. Gunthe

  4. National Balloon Facility, Tata Institute of Fundamental Research, ECIL Post 5, Hyderabad, 500 062, India

    P. R. Sinha

  5. Laboratoire d’Aérologie, CNRS, Observatoire Midi-Pyrénées, UMR 5560, 14 Avenue Edouard Belin, 31400, Toulouse, France

    P. Nedelec & Valérie Thouret

  6. Institut für Chemie und Dynamik der Geosphäre, Troposphäre (ICG-2), Forschungszentrum Jülich, Jülich, Germany

    Herman G. Smit

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Sahu, L.K., Sheel, V., Kajino, M. et al. Impact of tropical convection and ENSO variability in vertical distributions of CO and O3 over an urban site of India. Clim Dyn 49, 449–469 (2017). https://doi.org/10.1007/s00382-016-3353-7

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