By Dr B Mukhopadhyay
The author is Dy Director General of Meteorology, India Meteorological Department, New Delhi
Greenhouse gases and its increase in the atmosphere with its consequent warming trend is well documented. Debate concerning global warming is not related to the initial warming, which is inevitable, but the later response in terms of added moisture, sequestration by oceans, response from changes in cloud cover - all unknown with an increasing order of uncertainty.
Earth’s energy balance If one were to monitor from space the quantum of incoming and outgoing radiation; and average it over centuries - both radiations would be approximately in balance, keeping the earth in radiative equilibrium in a long term sense. But the spectral quality would certainly shift from a predominantly visible spectrum to infrared because of its thermal interaction with the climate system involving solid earth, atmosphere, oceans and biological elements. Radiation measured at the earth’s surface would however...