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Annual rainfall decreased between 1950-2010
AJIT PATOWARY
 GUWAHATI, April 6 – Annual rainfall over Assam has decreased during the past 60 years between 1950 and 2010. Moreover, winter mean minimum temperature of the State has also shown significant increasing trend.

These are the findings of a study named [‘State Level Climate Change Trends In India’ and conducted by LS Rathore, SD Attri and AK Jaswal and published by the India Meteorological Department (IMD).

However, during the above 60-year period, the highest increase and decrease in the annual rainfall were observed over Meghalaya (+14.68 mm in a year) and Andaman and Nicobar (-7.77 mm in a year) respectively, the study found.

It further found that average annual rainfall trends have increased over Andhra Pradesh, Bihar, Gujarat, Haryana, Jammu and Kashmir, Jharkhand, Lakshadweep, Manipur, Meghalaya, Mizoram, Odisha, Rajasthan, Tamil Nadu, Tripura and West Bengal during 1951-2010.

But annual rainfall has decreased over Andaman and Nicobar, Arunachal Pradesh, Assam, Chhattisgarh, Delhi, Goa, Himachal Pradesh, Karnataka, Kerala, Madhya Pradesh, Maharashtra, Nagaland, Punjab, Sikkim and Uttar Pradesh during the period, the study found.

Annual rainfall trends have been significantly increasing over West Bengal (+3.63 mm in a year) and significantly decreasing over Andaman and Nicobar (-7.77 mm in a year) and Uttar Pradesh (-4.42 mm in a year).

The study indicated increasing trend in winter mean maximum temperatures over all states of India, except Bihar, Chhattisgarh, Delhi, Haryana, Madhya Pradesh, Meghalaya, Punjab, Rajasthan, Tripura, Uttar Pradesh and West Bengal.

It further indicated that the average winter mean minimum temperatures have shown significant increasing trends over Arunachal Pradesh, Assam, Bihar, Delhi, Gujarat, Haryana, Lakshadweep, Manipur, Meghalaya, Rajasthan, Sikkim, Tamil Nadu, Tripura, Uttar Pradesh and West Bengal during the period.

The study also indicated that the winter mean temperatures have increased over all states of India, except Bihar, Chhattisgarh, Haryana, Jammu and Kashmir, Madhya Pradesh, Maharashtra, Odisha, Punjab, Uttar Pradesh and West Bengal. The increasing trends were significant over Andaman and Nicobar, Andhra Pradesh, Arunachal Pradesh, Assam, Goa, Gujarat, Himachal Pradesh, Kerala, Lakshadweep, Manipur, Meghalaya, Mizoram, Rajasthan, Sikkim, Tamil Nadu and Tripura.

The highest increase in winter mean temperature was obtained over Sikkim (+0.05 degree Celsius in a year) followed by Manipur (+0.04 degree Celsius in a year) and Tamil Nadu (+0.03 degree Celsius in a year). The winter mean temperatures for Punjab have decreased significantly by -0.02 degree Celsius in a year.

However, no trends were seen over Bihar, Chhattisgarh, Jammu and Kashmir, Madhya Pradesh, Maharashtra, Orissa, Uttar Pradesh and West Bengal during 1951-2010, the study said.

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