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科学通报  2013 

全球变暖背景下土地利用/土地覆盖变化气候效应的新认识

, PP. 2832-2839

Keywords: 土地利用/土地覆盖变化,全球变暖,气候效应

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Abstract:

温室气体排放和土地利用/土地覆盖变化(landuse/landcoverchange,LUCC)是人类影响气候变化的两种主要活动;在全球变暖背景下,温度和降水是否显著增加从而导致LUCC的气候效应更加剧烈?利用NCARCAM4.0模式,考虑温室气体和LUCC的年际变化情况下,探讨不同气候背景下LUCC气候效应的重要性.研究表明,在1850年温室气体含量背景下,LUCC引起的气候敏感性为0.54℃/(W/m2),而在当代温室气体含量背景下,LUCC引起的气候敏感性为-0.26℃/(W/m2).不同气候背景场对LUCC引起的温度差异在偏高纬度显著,全球变暖主要改变中高纬度的积雪-反照率来影响LUCC对温度的变化;而在热带和副热带区域,全球变暖引起的降水的区域差异是造成LUCC的气候响应存在不同的主要原因.

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