• V Satyan

      Articles written in Journal of Earth System Science

    • Role of barotropic, baroclinic and combined barotropic-baroclinic instability for the growth of monsoon depressions and mid-tropospheric cyclones

      B N Goswami R N Keshavamurty V Satyan

      More Details Abstract Fulltext PDF

      A detailed barotropic, baroclinic and combined barotropic-baroclinic stability analysis has been carried out with mean monsoon zonal currents over western India, eastern India and S.E. Asia. The lower and middle tropospheric zonal wind profiles over western India are barotropically unstable. The structure and growth rate of these modes agree well with the observed features of the midtropospheric cyclones. Similar profiles over eastern India and S.E. Asia, however, are barotropically stable. This is attributed to weak horizontal shear, inherent to these profiles. The upper tropospheric profiles, on the other hand, are barotropically unstable throughout the whole region. The features of these unstable modes agree with those of observed easterly waves. The baroclinic and combined barotropic-baroclinic stability analyses show that the baroclinic effects are not important in tropics.

      Though the barotropic instability of the mean zonal current seems to be res ponsible for the initial growth of the mid-tropospheric cyclones, neither barotropic nor baroclinic instability of the mean zonal current seem to explain the observed features of the monsoon depressions.

    • Phase space analysis of Indian summer monsoon rainfall over subdivisions

      V Satyan

      More Details Abstract Fulltext PDF

      Indian summer monsoon seasonal rainfall for the period 1871–1986 over the meteorological subdivisions has been analysed using the method of deterministic chaos. It is shown that a strange attractor underlies the monsoon evolution in each subdivision. The dimensionality of the attractor and the number of key variables necessary to model the subdivisional dynamics have been determined.

  • Journal of Earth System Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.