Articles written in Journal of Earth System Science

    • Trends in the genesis and landfall locations of tropical cyclones over the Bay of Bengal in the current global warming era

      Venkata Bhaskar Rao Dodla Srinivas Desamsetti Satyanarayana Gubbala China

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      Trends in tropical cyclone (TC) genesis and landfall over the Bay of Bengal (BOB) were analysed to identify global warming and climate change impacts. The historical TC data for the period 1901–2015 available through the cyclone eAtlas from India Meteorological Department were used. The analysis was confined to the 3-month period from October to December when the maximum number of TCs occurs over the BOB. Analysis was conducted for the two 50-yr periods of 1901–1950 and 1961–2010 and the four 30-yr periods of 1921–1950, 1961–1990, 1971–2000 and 1981–2010 to ascertain the differences and tendencies in the genesis and landfall points during the current global warming era since the 1960s and the previous years. The results indicate an increase of TC genesis over the south-east and central BOB and decrease over the south central region. Furthermore, an increased vulnerability of the Bangladesh coastline to TC landfall was detected. In addition, TC systems had decreased in number but increased in intensity. These results confirm the general reports of TC trends over the BOB as of other ocean basins in the post-industrialisation global warming era.

    • Assessment of wind energy potential over India using high-resolution global reanalysis data


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      An assessment of wind energy potential based on wind speed data over the Indian subcontinent has been made using high spatio-temporal resolution global reanalysis for the period from 1979 to 2018. Regions of high wind speed exceeding 4.5 m/s are identified over West Rajasthan, West Gujarat, Saurashtra and Kutch, Central Maharashtra, Interior Karnataka, and Rayalaseema. Threshold wind speeds are noted to occur during the daytime, and during the summer months from May through September. Wind speeds and the spatial extent of threshold winds increase rapidly with height below 40 m and then gradually up to 100 m. The wind power density is highest between 50 and 80 m, with the potential highest over Gujarat, Kutch, and Interior Karnataka and moderate over Saurashtra and Rayalaseema. This study also notifies that offshore wind potential is higher than over land, and most of the western parts of India are congenial for low wind farming. The present study clearly delineates wind speed distributions and wind power productivity regions over the entire Indian subcontinent. The results would provide authentic wind speed and wind power potential information that would be useful for the industries, government agencies, and industries concerning wind harness over India.


      $\bullet$ Wind power potential is assessed over the Indian subcontinent.

      $\bullet$ Spatial regions of wind speeds at different thresholds were identified.

      $\bullet$ Durations of wind speed hours per day for different thresholds were estimated.

      $\bullet$ Wind power potential at different heights was evaluated.

      $\bullet$ Favourable regions for wind farming over the Indian subcontinent were presented.

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