Global Radiation, Transmissivity and Bright Sunshine Hour Trend over Nagpur in Pre-Monsoon and Monsoon Seasons

Jyotsna Singh, Manoj Kumar, Bimal K. Bhattacharya

Agriculture-Forestry and Environment Group (AFEG), Space Applications Centre (ISRO), Ahmedabad, India.
Center of Excellence in Climatology, Birla Institute of Technology, Ranchi, India.

DOI: 10.4236/acs.2012.22021                

Abstract

Global dimming term was introduced in 1990s which means the decline in global radiation. This decline was reported in several studies across the world. In the present study time series analysis of global radiation (1960-2003), transmissivity (1960-2003) and bright sunshine hours (1973-2003) has been done over Nagpur during pre-monsoon (March to May) and monsoon seasons (June-September). A significant decrease in global radiation and transmissivity has been reported for both the seasons and it was higher during pre-monsoon compared to monsoon. Bright sunshine hour has also shown good agreement with the previous trend with a significant trend on pre-monsoon months only. Mann Kendall test was performed to confirm the significance of reported trend.

Keywords

Global Radiation; Bright Sunshine Hour; Transmissivity; Global Dimming; Mann Kendall Test

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	A. S. Ackerman, O. B. Toon, D. E. Stevens, A. J. Heymsfield, V. Ramanathan and E. J. Welton, “Reduction of Tropical Cloudiness by Soot,” Science, Vol. 288, No. 5468, 2000, pp.1042-1047. doi:10.1126/science.288.5468.1042
[2]	M. L. Mercado, N. Bellouin, S. Sitch , O. Boucher, C. Huntingford, M. Wild and P. M. Cox, “Impact of Chan- ges in Diffuse Radiation on the Global Land Carbon Sink,” Nature, Vol. 458, 2009, pp. 1014-1018. doi:10.1038/nature07949
[3]	A. Knohl and D. D. Baldocchi, “Effects of Diffuse Radiation on Canopy Gas Exchange Processes in a Forest Ecosystem,” Journal of Geophysical Research, Vol. 113, 2008, 17 p. doi:10.1029/2007JG000663
[4]	P. Alpert, P. Kishcha, Y. J. Kaufman and R. Schwarzbard, “Global Dimming or Local Dimming? Effect of Urbanization on Sunlight Availability,” Geophysical Research Letters, Vol. 32, 2005, 4 p. doi:10.1029/2005GL023320
[5]	B. G. Liepert., “Observed Reductions of Surface Solar Radiation at Sites in the United States and Worldwide from 1961 to 1990,” Geophysical Research Letters, Vol. 29, No. 10, 2002, p. 1421. doi:10.1029/2002GL014910
[6]	G. Stanhill and S. Cohen, “Global Dimming: A Review of the Evidence for a Widespread and Significant Reduction in Global Radiation with Discussion of Its Probable Causes and Possible Agricultural Consequences,” Agricultural and Forest Meteorology, Vol. 107, No. 4, 2001, pp. 255-278. doi:10.1016/S0168-1923(00)00241-0.
[7]	M. Wild, et al., “From Dimming to Brightening: Decadal Changes in Surface Solar Radiation,” Science, Vol. 308, No. 5723, 2001, pp. 847-850. doi:10.1126/science.1103215
[8]	J. R. Magnus, B. Melenberg and C. Muris, “Global Warming and Local Dimming: The Statistical Evidence,” Journal of the American Statistical Association. Vol. 106, No. 494, 2011, pp. 452-464. doi:10.1198/jasa.2011.ap09508
[9]	U. Lohmann and J. Feichter, “Global Indirect Aerosol Effects: A Review,” Atmospheric Chemistry and Physics, Vol. 5, 2005, pp. 717-735. doi:10.5194/acp-5-715-2005
[10]	B. A. Albrecht, “Aerosols, Cloud Microphysics, and Fractional Cloudiness,” Science, Vol. 245, No. 4923, 1989, pp. 1227-1230. doi:10.1126/science.245.4923.1227
[11]	S. Solomen, et al., “The Physical Science Basis. Contribution of Working Group I to the Fourth Assesment Report of the Intergovernmental Panel on Climate Change,” Cambridge University Press, Cambridge, 2007.
[12]	J. L. Lean and D. H. Rind, “How Will Earth’s Surface Temperature Change in Future Decades?” Geophysical Research Letter, Vol. 36, 2009, 5 p. doi:10.1029/2009GL038932
[13]	J. Srinivasan and P. C. Joshi, “What Have We Learnt about Indian Monsoon from Satellite Data?” Current Science, Vol. 93, No. 2, 2007, pp. 165-177.
[14]	H. N. Singh and G. N. Tiwari, “Evaluation of Cloudiness/Haziness Factor for Composite Climate,” Energy, Vol. 30, 2005, pp. 1589-1601. doi:10.1016/j.energy.2004.04.036
[15]	R. Burman and L. Pochop, “Evaporation, Evapotranspiration and Climatic Data,” Amsterdam, Elsevier, 1994, p. 278.
[16]	R. O. Gilbert, “Statistical Methods for Environmental Pollution Monitoring,” John Willey and Sons, Inc., New York, 1987, p. 336.
[17]	M. G. Kendall, “Rank Correlation Methods,” 4th Edition, Charles Griffin, London, 1975, p. 202.
[18]	W. L. Darnell, W. F. Staylor, S. K. Gupta, N. A. Ritchie and A. C. Wilber, “Seasonal Variation of Surface Radiation Balance Derived from International Cloud Climatology Project C1 Data,” Journal of Geophysical Research, Vol. 97, No. 14, 1992, pp. 15741-15760. doi:10.1029/92JD00675
[19]	K. V. S. Badarinath, A. R. Sharma, D. G. Kaskaoutis, S. K. Kharol and H. D. Kambezidis, “Solar Dimming over the Tropical Urban Region of Hyderabad, India: Effect of Increased Cloudiness and Increased Anthropogenic Aerosols,” Journal of Geophysical Research, Vol. 115, 2011, 18 p. doi:10.1029/2009JD013694
[20]	J. Lean, “The Sun’s Variable Radiation and Its Relevance to the Earth,” Annual Review of Astronomy and Astrophysics, Vol. 35, 1997, pp. 33-67. doi:10.1146/annurev.astro.35.1.33
[21]	M. Wild, “The Heat Balance of the Earth in GCM Simulations of Present and Future Climate,” Zuechercher Geografische Schriften, Vol. 68, 1997, p. 188.
[22]	V. Ramanathan, P. J. Crutzen, J. T. Kiehl and D. Rosenfeld, “Aerosol, Climate and the Hydrological Cycle,” Science, Vol. 294, No. 5549, 2001, pp. 2119-2124. doi:10.1126/science.1064034
[23]	K. Singh, D.P. Singh, C.K. Dixit, N. Singh, C. Sharma , S. Sahai, A. K. Jha, Z. H. Khan and P. K. Gupta, “Chemical Characteristics of Aerosols and Trace Gas Distribution over North and Central India,” Environmental Monitoring Assessment, 2011. doi:10.1007/s10661-011-2284-3