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Appearance of the persistently low tropopause temperature and ozone over the Bay of Bengal region

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Abstract

This paper reports the observation of persistently low tropopause temperatures (100 hPa temperatures, T 100) and ozone at 100 hPa throughout the year as compared to the corresponding zonal mean values over the Bay of Bengal (BOB) region. The long term mean T 100 (i.e., from January 2006–December 2009) over the BOB is ~2.2 K lower than the zonal mean values over this region. The multiple linear regression analysis has been carried out to study the role of convection and ozone in giving rise to the persistently low T 100 over the BOB. Results show that the low ozone mixing ratios contributes ~1.2 K and convection contributes ~0.35 K to the persistently low T 100. The contribution of convection to the persistent low T 100 is mainly during the boreal monsoon season.

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Acknowledgements

The authors gratefully acknowledge Goddard Earth Sciences Data and Information Services Centre for providing the Aura MLS WVMR and temperature data. The ISCCP-D1 data were obtained from the International Satellite Cloud Climatology Project data archives, ozone (Nadir) data were obtained from the Aura TES data archives at the NASA Langley Research Center and OLR data are obtained from the ESRL-NOAA website. The authors are thankful to the anonymous reviewer for his valuable suggestions. The authors are also thankful to Head, NCMRWF for his support in completion of this work. This work is funded by ISRO/DOS under CAWSES India Phase-II program.

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Author notes

  1. Shipra Jain

    Present address: National Centre for Medium Range Weather Forecasting (NCMRWF), Ministry of Earth Sciences, Noida, Uttar Pradesh, 201309, India

  2. A. R. Jain

    Present address: , A-152, Sector-26, Noida, Uttar Pradesh, 201301, India

Authors and Affiliations

  1. National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi, 110012, India

    Shipra Jain, A. R. Jain & T. K. Mandal

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  1. Shipra Jain
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Correspondence to Shipra Jain.

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Jain, S., Jain, A.R. & Mandal, T.K. Appearance of the persistently low tropopause temperature and ozone over the Bay of Bengal region. Meteorol Atmos Phys 131, 81–88 (2019). https://doi.org/10.1007/s00703-017-0554-5

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