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Attri, S. D.
- Impact of Observed Climate Change on the Classification of Agroclimatic Zones in India
Abstract Views :395 |
PDF Views:117
Authors
N. Chattopadhyay
1,
A. K. Sahai
1,
P. Guhathakurta
1,
S. Dutta
1,
A. K. Srivastava
1,
S. D. Attri
2,
R. Balasubramanian
1,
K. Malathi
1,
Swati Chandras
1
Affiliations
1 India Meteorological Department, Shivajinagar, Pune 411 005, IN
2 India Meteorological Department, New Delhi 110 003, IN
1 India Meteorological Department, Shivajinagar, Pune 411 005, IN
2 India Meteorological Department, New Delhi 110 003, IN
Source
Current Science, Vol 117, No 3 (2019), Pagination: 480-486Abstract
The classification of agroclimatic zones in India was made in the 1990s for identifying priorities and developing strategies for location-specific and need-based research as well as overall agricultural development in the country. Long-term climatic parameters, particularly temperature and rainfall along with soil and crop information were used for the classification of agroclimatic zones. It has been documented with a fair degree of accuracy that overall climate is changing, particularly with respect to temperature over the Indian region. Thus it is anticipated that in the recent past, climate change may be reflected in the agroclimatic zones as well and ultimately affect the criteria of their classification based on climatic parameters. The objective of the present study is to examine the trends and spatial/temporal variability of temperature, rainfall, rainy days, and heavy rainfall in different agroclimatic zones of the country, which may help in better understanding of the further initiatives on reclassification of agroclimatic zones, if required. Using various long-term gridded data from 1985 and instrumental datasets starting from 1951 to 1980, studies have been made to observe changes in different components of the climatic variables, i.e. temperature and rainfall. It has been observed that there are significant changes in temperature and rainfall, both temporally and spatially, across India and there is a definite shift in temperature and rainfall patterns in the recent past compared to 1951–1980. It has also been inferred that there is a need to reconsider the classification of agroclimatic zones in India under the scenario of observed climate changes in the country.Keywords
Agroclimatic Zones, Classification, Climatic Parameters, Climate Change.Full Text
References
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- Impact Assessment of a Severe Dust Storm on Atmospheric Aerosols Over an Urban Site in India
Abstract Views :515 |
PDF Views:142
Authors
Affiliations
1 Jamia Millia Islamia, New Delhi 110 025, IN
2 India Meteorological Department, New Delhi 110 003, IN
1 Jamia Millia Islamia, New Delhi 110 025, IN
2 India Meteorological Department, New Delhi 110 003, IN
Source
Current Science, Vol 118, No 5 (2020), Pagination: 737-749Abstract
An intense dust storm occurred over the northwestern part of India between 28 and 31 May 2014, that drastically reduced air quality and visibility over the region. This study evaluates the impact of dust storm on aerosol characteristics over the mega city of Delhi. As the storm reached Delhi on 30 May 2014, the PM10 concentration soared to an unusually high value of more than 933 μg m–3. The aerosol optical properties such as aerosol optical depth (AOD), Ångström exponent (AE), single scattering albedo (SSA), and asymmetry parameter were measured using the groundbased sky radiometer installed at India Meteorological Department (IMD), New Delhi. During the dust event, higher AOD was recorded at 500 nm (1.456 ± 0.158), while AE dropped to 0.287. Large variation in SSA indicated the optical state of dust to be more absorbing in nature. The water vapour content in the atmosphere was also analysed from measurements taken at the 940 nm channel of the instrument. During the study period, radiative forcing at the surface, atmosphere and top of the atmosphere ranged from –31 to – 82, 15 to 92 and 2 to 10 Wm–2 respectively. On the day of dust storm, large reduction in aerosol radiative forcing was observed at the surface level that caused significant cooling.Keywords
Atmospheric Aerosol, Dust Storm, Sky Radiometer, Radiative Forcing, Urban Site.Full Text
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