Subarna Bhattacharyya

Climformatics, Inc.

The rising costs of climate change merit serious evaluation of potential climate restoration solutions. The highest rate of change in climate is observed in the Arctic where the summer ice is diminishing at an accelerated rate. The loss of Arctic sea ice increases radiative forcing and contributes to global warming. Restoring reflectivity of Arctic...

The nature of scientific and engineering problems of real world is often very complex. These problems are intrinsically multi-dimensional, multivariate, nonlinear and non-stationary in their dynamics. Solutions to these problems often necessitate the use of complex mathematical modeling, simulation and analysis which are traditionally achieved by t...

A highly potent greenhouse gas, methane, is locked in the solid phase as ice-like deposits containing a mixture of water and gas (mostly methane) called clathrates in both ocean sediments and underneath permafrost regions. Clathrates are stable under high pressures and low temperatures. In a warming climate, increases in ocean temperatures could le...

Methane is the most important greenhouse gas after carbon dioxide, with particular influence on near-term climate change. It poses increasing risk in the future from both direct anthropogenic sources and potential rapid release from the Arctic. A range of mitigation (emissions control) technologies have been developed for anthropogenic sources that...

A highly potent greenhouse gas, methane, is locked in the solid phase as ice-like deposits called clathrates in both ocean sediments and underneath permafrost regions. Clathrates contain methane trapped in cages made of water molecules. Clathrates are stable under high pressures and low temperatures. In a warming climate, increases in ocean tempera...

A highly potent greenhouse gas, methane, is locked in the solid phase as ice-like deposits containing a mixture of water and gas (mostly methane) called clathrates, in ocean sediments and underneath permafrost regions. Clathrates are stable under high pressure and low temperatures. Recent estimates suggest that about 1600 - 2000GtC of clathrates ar...

A vast quantity of a highly potent greenhouse gas, methane, is locked in the solid phase as methane clathrates in ocean sediments and underneath permafrost regions. Clathrates are ice-like deposits containing a mixture of water and gas (mostly methane) which are stable under high pressure and low temperatures. Current estimates are about 1600 - 200...

The possible connections between the El Nino-Southern Oscillation (ENSO) phenomenon and Indian monsoon rainfall have been widely discussed in the meteorological literature. We show strong statistical evidence here for connections of ENSO with solar activity. This is particularly evident in a comparison between the two contrasting test periods of 18...

Evidence presented in this paper shows that connections of ENSO with solar activity parameters are statistically stronger than those between ENSO and Indian summer monsoon rainfall. The global wavelet cross spectrum between solar irradiance and (a) monsoon rainfall and (b) the global ENSO index, show significant power around the dominant period of...

The wavelet cross spectra of the yearly sunspot index and homogeneous-zone Indian monsoon rainfall time series are examined over the 120 a period 1871–1990 using Morlet continuous wavelets. The cross spectra of sunspot numbers with synthetic noise ensembles, including those matching the spectrum and probability distribution function of the rainfall...

There is now considerable evidence that solar activity influences terrestrial climate in the long term, but recent work shows significant connections also on shorter multidecadal scales, in particular between solar activity and Indian monsoon rainfall. Analysis of rainfall over the two test periods 1878-1913 and 1933-1964, each comprising three com...

The existence of possible correlations between the solar cycle period as extracted from the yearly means of sunspot numbers and any periodicities that may be present in the Indian monsoon rainfall has been addressed using wavelet analysis. The wavelet transform coefficient maps of sunspot-number time series and those of the homogeneous Indian monso...

Over the 120 y period (1871–1990) for which reliable Indian rainfall statistics are available, solar activity parameters exhibit nonstationarity. Taking this fact into account, we present here the results of an analysis of four solar activity indices and seven major Indian monsoon rainfall time series, over two distinct test periods respectively of...

Using the Morlet continuous wavelet transform on data over the period 1871-1990, it is found that the global wavelet cross spectra between two solar activity indices and seven major Indian monsoon rainfall time series show significant power around the period of the 11 year solar cycle, passing the $\chi^2$ test of significance proposed by Torrence...