Total views : 577
Observational Study of Pre-monsoon Thunder Events over Delhi and Guwahati Region
Thunder events are common during pre-monsoon season (March -May). In this paper thunder events of Delhi and Guwahati for the month of May and April have been analysed with Global Navigation Satellite System (GNSS) derived precipitable water vapour and Moderate Resolution Imaging Spectroradiometer (MODIS) derived Aerosol Optical Depth (AOD) at 550 nm data. It is observed that GNSS derived precipitable water vapour have the potential to nowcast or characterize the mesoscale event. In all cases the AOD and Integrated Precepitable Water Vapour (IPWV) increases before the thunder event which accompanied with duststorm and consequently increase the aerosol loading in the atmosphere. The rate of increase of IPWV (d/dt(IPWVdt)) is observed approximately 3-4 mm /hour during the convective initiation and relative increase of AOD is 150-300 %. The various thermodynamic parameters of radiosounding to understand better the thunder activity are also highlighted in the paper.
AOD, IPWV, Thunder Events and Pre-monsoon
- Ackerman SA Strabala KI Menzel WP Frey RA Moeller CC and Gumley LA (1998) Discriminating clear sky from clouds with MODIS. J. Geophy. Res. 103, 32141–32157.
- Andreae MO (1995) Climatic effects of changing atmospheric aerosol levels. In: World Survey of Climatology. 16: Future Climates of the World. Henderson-Sellers A. (ed.), Elsevier, Amsterdam.
- Bluestein HB (1993) Synoptic-Dynamic meteorology in midlatitudes. Oxford University Press. Vol. 2, 594.
- Charlson RJ, Schwartz SE, Hales JM, Cess RD, Coakley JA, Hansen JE and Hoffman DJ (1992) Climate forcing by anthropogenic aerosols. Sci. 255, 423–430.
- Chatterjee K (1985) Nature and role of aerosols in the atmosphere,ISRO-IMAP-SR-26-85, 1-22.
- Chu DA, Kaufman YJ, Zibordi G, Chern JD, Mao J, Li C and Holben BN (2003) Global monitoring of air pollution over land from the Earth Observing System- Terra Moderate Resolution Imaging Spectroradiometer (MODIS). J.Geophys. Res. 108 (D21), 4661, doi:10.1029/2002JD003179.
- Dey, Sagnik and Girolamo, Larry Di (2010) Climatology of aerosol optical and microphysical properties over the Indian subcontinent from 9 years (2000–2008) of Multiangle Imaging Spectroradiometer (MISR) data. J. Geophys. Res. 115 (D15): D15204 DOI: 10.1029/2009JD013395.
- Gupta P, Gadhavi H and Jayaraman A (2003) Aerosol optical depth variation observed using sunphotometer over Indore. Indian J. Radio & Space Phys. 32, 229.
- Jayaraman A, Ramachandran S and Subbaraya BH (1998) Aerosol characteristics over the Arabian Sea and the tropical Indian Ocean. In: Global Change Studies, Scientific Results from ISRO– GBP. Subbaraya BH et al. (eds.), 93–113.
- Joseph PV (1982) A tentative model of Andhi. Mausam. 33, 417-422.
- Joseph PV, Raipal DK and Deka SN (1980) Andhi, the convective duststorm of northwest India. Mausam. 31,431-442.
- Kaufman YJ and Tanre D (1998) Algorithm for remote sensing of tropospheric aerosols from MODIS. MODIS Algorithm Theoretical Basis Document, Product ID: MOD04, Revised 26 October, Available at: http://modis.gsfc.nasa.gov/ data/atbd/atbd mod02.pdf.
- King RW and BockY (1997) Documentation for the GAMITGPS analysis software. Release 9.66, Mass. Ins. of Technol., Cambridge Mass.
- Krishnamoorthy K, Nair PR & Satheesh SK (1998) On the climatology of aerosol optical depths in global change studies, scientific results from ISRO –GBP. Subbaraya BH, Rao DP, Desai PS, Manikiam B & Rajaratnam P (eds.), ISRO, India, 45-66.
- Pandey R and Vyas BM (2004) Study of total column ozone, precipitable water content and aerosol optical depth at Udiapur a tropical station. Curr. Sci. (India) 86, 305.
- Prasad AK, Singh RP and Singh A (2004) Variability of Aerosol Optical Depth Over Indian Subcontinent Using MODIS Data. J. Indian Soc. of Remote Sensing. 32 (4) 313-316.
- Saha Auromeet and Krishna Moorthy K (2004) Impact of precipitation on aerosol spectral optical depth and retrieved size distributions: a case study. J. Appl. Meteor. 43, 902–914.
- SC Heever Van den, Carrió GG, Cotton WR and Straka WC (2005) The impacts of Saharan dust on Florida storm characteristics. Preprints, 16th Conf. on Planned and Inadvertent Weather Modification, San Diego, CA, Amer. Meteor. Soc.
- Weisman ML and Klemp JB (1982) The dependence of numerically simulated convective storms on vertical wind shear and buoyancy. Mon. Wea. Rev. 110, 504–520.
- There are currently no refbacks.
This work is licensed under a Creative Commons Attribution 3.0 License.