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| Home > Publications database > Isolating the effects of land use land cover change and inter-decadal climate variations on the water and energy cycles over India, 1981–2010 |
| Home > Publications database > Isolating the effects of land use land cover change and inter-decadal climate variations on the water and energy cycles over India, 1981–2010 |
| Journal Article | FZJ-2023-00508 |
; ;
2022
Elsevier
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.jhydrol.2022.128267
Abstract: Aim of this work is the assessment of the individual and combined impacts of land use land cover change (LULCC) and inter-decadal climate variations (CV) on the water and energy cycles over India, given extensive land use land cover change over the last decades. In this study, we quantify the contributions of LULC and CV on changes in the water and energy cycles over the Indian subcontinent through a scenario-based approach, with Community Land Model version 4.5 (CLM4.5) model runs from 1981 to 2010. The approach involves four simulation scenarios: (i) the first scenario considers no LULCC or CV (LULC is fixed and the atmospheric forcings for 1981–1990 are repeated in the decades afterwards); (ii) the second scenario considers only the impact of CV; (iii) the third scenario considers only the effect of LULCC by updating the LULC every 10 years; and (iv) the fourth scenario considers the combined impact of LULCC and CV. LULCC causes an overall decrease in the evapotranspiration (ET) and soil moisture (SM) by 0.3 % and 0.1 % respectively (comparing 1991–2010 with 1981–1990), while the net radiation changes < 1 %. On the other hand, CV caused an increase in the ET, SM and net radiation by + 5.4 %, +1.5 % and + 1.0 % respectively, in spite of decrease of precipitation of 6.6 %. The combined effect of LULCC and CV leads to an increase in the overall ET by 3.8 %. Among the LULC transitions, deforestation and urbanization are found to be the major causes for hydrological changes over the decades, but their impact is much smaller, since CV has a greater impact on the hydrological cycles over India than LULC. The in-depth understanding of the distinct contributions of LULCC and CV on the water and energy cycles in tropical and subtropical regions can be used for framing future water resources planning and management policies.
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