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Quantification Of The Contribution Of Human Influences ( Hi ) On Regional Climate Change

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Quantification of the contribution of human influences (HI) on regional climate change is a focus of climate change research (Dirmeyer et al., 2010; Kalnay and Cai 2003). Quantification of such influences can help us understand regional climate patterns and improve the accuracy and algorithms/mechanism of downscaling general circulation models (Lawrence and Chase, 2010; Li et al., 2012; Zhao and Pitman, 2002). The important human influences on regional climate are land-use and land-cover change (LUCC) (Pielke et al., 2002) as well as of human activities (such as greenhouse gases emission) (Fall et al., 2010; IPCC 2013), but their impacts are different (Mahmood et al., 2014). When notable LUCC occurs, the local radiative forcing change caused by surface albedo may actually be greater than that due to the collective, well-mixed human greenhouse gases (Pielke et al., 2002). So far, between one-third and one-half of the land surfaces of the world have been transformed by human development (Bettwy 2005). The human-made LUCC and the resulting alterations in surface features are major drivers of long-term global climate patterns (Pielke 2005). Moreover, a modeling result indicated that future LUCC will continue to play a major role affecting climate for the next century (Feddema et al., 2005).
Over the past century, conversion of natural landscapes to anthropogenic landscapes (such as agricultural land) have been the most prominent LUCC in many regions of the world

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