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  • 1.
    Tyagi, Bhishma
    et al.
    Stockholm University, Faculty of Science, Department of Meteorology .
    Satyanarayana, A. N. V.
    Coherent structures contributions in fluxes of momentum and heat at two tropical sites during pre-monsoon thunderstorm season2014In: International Journal of Climatology, ISSN 0899-8418, E-ISSN 1097-0088, Vol. 34, no 5, p. 1575-1584Article in journal (Refereed)
    Abstract [en]

    An attempt has been made to differentiate percentage contribution of coherent structures (CS) in the turbulent fluxes of heat and momentum during thunderstorm days (TD) and non-thunderstorm days (NTD) at two tropical sites. Pre-monsoon months (Marcha to May) fast response data (10Hz) of wind and temperature at Kharagpur (22 degrees 30N, 87 degrees 20E) for years 2007, 2009, and 2010, and at Ranchi (23 degrees 25N, 85 degrees 26E) for years 2008-2010 have been used. The contributions were calculated after decomposing the time series using wavelet technique by two methods: (1) the method of quadrant analysis for each scale, and (2) the method of zero-crossing. Contributions of CS in momentum flux are higher in TD than NTD, whereas for heat flux CS contribution is higher for NTD to that of TD at both sites; however, values are different at both sites and by each method as well. Significant percentages of contributions of CS to the total flux are noticed at both the sites.

  • 2.
    Tyagi, Bhishma
    et al.
    Stockholm University, Faculty of Science, Department of Meteorology .
    Satyanarayana, A. N. V.
    Rajvanshi, R. K.
    Mandal, M.
    Surface Energy Exchanges during Pre-monsoon Thunderstorm Activity over a Tropical Station Kharagpur2014In: Pure and Applied Geophysics, ISSN 0033-4553, E-ISSN 1420-9136, Vol. 171, no 7, p. 1445-1459Article in journal (Refereed)
    Abstract [en]

    In the present study an attempt has been made to understand the variation of surface energy fluxes such as net radiation, sensible, latent and soil heat during different epochs of thunderstorm activity at Kharagpur. The study also focuses in delineating the difference in the surface energy budget from the days of thunderstorm activity to fair weather days in the pre-monsoon months (April and May) which is locally known as thunderstorm season. For this purpose, experimental data obtained from the Severe Thunderstorms- Observations and Regional Modeling (STORM) programme during pre-monsoon months of 2007, 2009 and 2010 at Kharagpur (22A degrees 30'N, 87A degrees 20'E), West Bengal, India are used. The present study reveals quick response, in the order of a few days, in the variations of transport of energy fluxes at soil-atmosphere interface to the upper atmosphere vis-A -vis to the occurrence of thunderstorm activity. Rise of surface sensible heat flux to the level of surface latent heat flux a day or two before the occurrence of a thunderstorm has been identified as a precursor signal for the thunderstorm occurrence over Kharagpur. Distinguishable differences are found in the partitioning of the surface energy fluxes to that of net radiation between thunderstorm and non-thunderstorm days. The present study reveals more Bowen's ratio during thunderstorm days to that of nonthunderstorm days. These results are useful in validating mesoscale model simulations of thunderstorm activity.

  • 3.
    Tyagi, Bhishma
    et al.
    Stockholm University, Faculty of Science, Department of Meteorology .
    Satyanarayana, A. N. V.
    Vissa, Naresh Krishna
    Thermodynamical Structure of Atmosphere during Pre-monsoon Thunderstorm Season over Kharagpur as Revealed by STORM Data2013In: Pure and Applied Geophysics, ISSN 0033-4553, E-ISSN 1420-9136, Vol. 170, no 4, p. 675-687Article in journal (Refereed)
    Abstract [en]

    Variation of atmospheric thermodynamical structure parameters between days of thunderstorm occurrence and non-occurrence is presented based on data sets obtained during Severe Thunderstorm-Observations and Regional Modeling (STORM) experiments conducted over Kharagpur (22.3A degrees N, 87.2A degrees E) in pre-monsoon season of 2009 and 2010. Potential instability (stable to neutral) is noticed in the lower layers and enhanced (suppressed) convection in the middle troposphere during thunderstorm (non-thunderstorm) days. Low-level jets are observed during all days of the experimental period but with higher intensity on thunderstorm days. Convective available potential energy (CAPE) builds up until thunderstorm occurrence and becomes dissipated soon after, whereas convective inhibition (CIN) is greatly decreased prior to the event on thunderstorm days. In contrast, higher CAPE and CIN are noticed on non-thunderstorm days. Analysis of thermodynamic indices showed that indices including moisture [humidity index (HI) and dew point temperature at 850 hPa (DPT850)] are useful in differentiating thunderstorm from non-thunderstorm days. The present study reveals that significant moisture availability in the lower troposphere in the presence of convective instability conditions results in thunderstorm occurrence at Kharagpur.

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