Modelling for Science, for a better future - some recent outcomes
Effect of Rotation, Magnetic Field and Initial Stresses on Propagation of Plane Waves in Transversely Isotropic Dissipative Half Space
by Sushant Shekhar and Imtiyaz A. Parvez
The problem regarding the reflection of plane waves in a transversely isotropic dissipative medium is considered, in
which we are studying about the reflection of incidence waves in initially stressed dissipative half space. After solving
the governing equations, we find the two complex quasi-P(qP) and quasi-SV(qSV) waves. The occurrence of reflected
waves is studied to calculate the reflection coefficient and the energy partition of incidence wave at the plane boundary
of the dissipative medium. Numerical example is considered for the reflection coefficient and the partition of incident
energy, in which we study about the effect of rotation, initial stresses and magnetic field.
Full paper can be read at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=35184
How dependent is climate change projection of Indian summer monsoon rainfall and extreme events on model resolution?
by K. Rajendran, S. Sajani, C. B. Jayasankar and A. Kitoh
Advances in climate modelling now provide the opportunity for utilizing global general circulation models (GCMs) at very high-resolution for projections of future climate and extreme events. Diagnostics of global atmospheric GCM simulations at different horizontal resolutions of 20, 60, 120 and 180 km reveals the marked skill of 20 km mesh GCM (MRI-AGCM3.2S) in capturing regional characteristics of climatological summer monsoon rainfall over India and its frequency distribution, and mean annual variation of rainfall over most of the homogeneous regions of India. Future projections by time-slice simulations of MRI-AGCM3.2S under global warming scenario show widespread but spatially varying increase in rainfall over interior regions of peninsular, west central, central northeast and North East India (~ 5-20% of seasonal mean) and significant reduction in orographic rainfall over the west coast (~ 10-15%, consistent with the recent observed trends). MRI-AGCM3.2S projects spatially heterogeneous increase in warm days and extreme hot events (highest decile) over India.
Semi-diurnal variation of surface rainfall studied from global cloud-system resolving model and satellite observations
by T. Inoue ; K. Rajendran ; M. Satoh ; H. Miura and J. Schmetz
We studied the semi-diurnal variation of surface rainfall over southern Africa and the Amazon simulated by a global cloud system resolving model (Nonhydrostatic ICosahedral Atmospheric Model; NICAM) under realistic conditions with land-sea contrast.