Influence of land use/land cover (LULC) changes on atmospheric dynamics over the arid region of Rajasthan state,India |
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| Institution: | 1. Atmospheric Science Section, National Remote Sensing Centre, Department of Space-Govt. of India, Balanagar, Hyderabad 500 625, India;2. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada;3. Research and Technology Development Centre, Sharda University, Greater Noida, NCR 201306, India;4. TERI University, 10 Vasant Kunj Institutional Area, New Delhi 110070, India;5. School of Earth and Environmental Sciences, Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA;1. Department of Remote Sensing and GIS, Vidyasagar University, West Bengal, India;2. Centre of Atmosphere, Ocean and Space Studies, Institute of Interdisciplinary Studies, University of Allahabad, Uttar Pradesh, India;3. Indian Institute of Remote Sensing, Indian Space Research Organization, Uttarakhand, India;4. Department of Geography, University of Allahabad, Uttar Pradesh, India;1. National Institute of Urban Affairs (NIUA), New Delhi 110 003, India;2. Department of Natural Resources, TERI University, New Delhi 110 070, India;3. School of Environmental Sciences, Jawaharlal Nehru University (JNU), New Delhi India;4. Vlaamse Instelling Voor Technologisch Onderzoek (VITO), Boeretang 200, 2400 Mol, Belgium;1. Department of Forestry and Natural Resources, National Chiayi University, 300 University Rd., Chiayi 60004, Taiwan;2. Department of Electrical Engineering, National Taipei University of Technology, 1 Zhongxiao E. Rd., Sec. 3, Taipei 10608, Taiwan;3. Department of Electrical Engineering, National Chung Hsing University, 250, Kuo Kuang Rd., Taichung 402, Taiwan;4. Department of Computer Science and Electrical Engineering, UMBC, 1000 Hilltop Circle, Baltimore, MD 20250, USA |
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| Abstract: | The present study examines the long-term effects of land use/land cover (LULC) changes in Rajasthan state, India on land-atmosphere fluxes and, possibly in precipitation and aerosol loading. By comparing the satellite observations from Landsat MSS (1972–73) and IRS-P6 AWiFS (2006–07) considerable LULC changes are observed, an increase in crop-land and vegetated areas of ～57% in the eastern and ～68% in the western Rajasthan. The increase in agriculture intensification from irrigation activities after the construction of the Indira Gandhi canal (IGC) seems to affect the land-atmosphere fluxes, i.e. increase in atmospheric humidity and latent heat and reduction in sensible heat. On the other hand, the multi-decadal variability (1951–2007) in annual rainfall amount and total number of rainy days reveals significant year-to-year fluctuations, exhibiting a slight increasing trend over arid western Rajasthan. However, the overall analysis shows that the variability in precipitation is much more influenced by the general monsoonal circulation (i.e. meteorological dynamics and intensity of the monsoon) and partly can be associated with local phenomena, such as LULC changes and modifications in land-atmosphere fluxes. Similarly to precipitation, the long-term (1979–2008) aerosol index (AI) variations over the region seem to be affected by atmospheric and meteorological dynamics and not by LULC changes. |
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