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Temporal evolution of measured climate forcing agents at South Pole, Antarctica

Ghude, SD and Jain, SL and Arya, BC (2009) Temporal evolution of measured climate forcing agents at South Pole, Antarctica. Current Science, 96 (1). pp. 49-57.

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Greenhouse gas (GHG; mainly CO 2, CH 4, N 2O, CFC-11 and CFC-12) measurements for 22 years (1983-2004) have been analysed to evaluate the radiative forcing (RF) and temporal evolution at the South Pole. About 20 increase in growth rate of CO 2 has been observed during 1992-2004 compared to 1983-91. However, remarkable deceleration in the growth rate of CH 4, CFC-11 and CFC-12 has been observed. CO 2 radiative forcing has increased by ~49 during 2004 for 10 increase in CO 2 concentration during the last 22 years. RF due to CH 4 was found to be 0.47 Wm -2 in 1999 and since then has remained almost constant through 2004. The net RF has been observed to increase by 0.7 Wm -2 during 2004 compared to 1983, which corresponds to ~38 increase in the last 22 years. Growth rate of net RF decreased by ~22 during 1990-2004, compared to the growth rate during 1983-90. A global warming simulation made using the EdGCM model shows an increase in surface air temperature and sea surface temperature of about 1.7 oC and 1 oC respectively, in 2050 compared to 1958. In response to change in GHGs from 1958 to 2050, warming over the higher latitudes is greater than in the tropics and also increase in minimum temperature is greater than the increase in maximum temperature. Similarly, up to 50 change in snow-ice cover over some of the regions in the higher latitudes is observed with this simulation.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian Academy of Science
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 18 Feb 2015 16:00
Last Modified: 18 Feb 2015 16:00

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