利用WRF(Weather research and forecasting)中尺度气象模式结合MODIS资料反演的植被覆盖度,并同化东北半干旱区近地面气象要素,对夏季东北半干旱区的辐射和能量传输过程进行模拟,并用2009年通榆站6-8月份的通量观测资料进行验证...利用WRF(Weather research and forecasting)中尺度气象模式结合MODIS资料反演的植被覆盖度,并同化东北半干旱区近地面气象要素,对夏季东北半干旱区的辐射和能量传输过程进行模拟,并用2009年通榆站6-8月份的通量观测资料进行验证。结果表明:通榆站模拟的向上/向下短波、向上/向下长波辐射与观测值吻合较好,相关系数分别为:0.86、0.85、0.73和0.88,偏差Bias均在36.7w/m^2以下,潜热、感热和地表热通量密度观测日积分值分别占净辐射的28.8%、53.4%和3.4%。WRF模式也能较好地模拟出东北半干旱区夏季地表辐射与能量分量的区域分布特征。展开更多
Wetlands are sensitive to climate change, in the same time, wetlands can influence climate. This study analyzed the spa- rio-temporal characteristics of wetland change in the semi-arid zone of Northeast China from 198...Wetlands are sensitive to climate change, in the same time, wetlands can influence climate. This study analyzed the spa- rio-temporal characteristics of wetland change in the semi-arid zone of Northeast China from 1985 to 2010, and investigated the impact of large area of wetland change on local climate. Results showed that the total area of wetlands was on a rise in the study area. Although natural wetlands (marshes, riparians and lakes) decreased, constructed wetlands (rice fields) increased significantly, and the highest in- crease rate in many places exceeded 30%. Anthropogenic activities are major driving factors for wetland change. Wetland change pro- duced an impact on local climate, mainly on maximum temperature and precipitation during the period of May-September. The increase (or decrease) of wetland area could reduce (or increase) the increment of maximum temperature and the decrement of precipitation. The changes in both maximum temperature and precipitation corresponded with wetland change in spatial distribution. Wetland change played a more important role in moderating local climate compared to the contribution of woodland and grassland changes in the study area. Cold-humid effect of wetlands was main way to moderating local climate as well as alleviating climatic wanning and drying in the study area, and heterogeneity of underlying surface broadened the cold-humid effect of wetlands.展开更多
文摘利用WRF(Weather research and forecasting)中尺度气象模式结合MODIS资料反演的植被覆盖度,并同化东北半干旱区近地面气象要素,对夏季东北半干旱区的辐射和能量传输过程进行模拟,并用2009年通榆站6-8月份的通量观测资料进行验证。结果表明:通榆站模拟的向上/向下短波、向上/向下长波辐射与观测值吻合较好,相关系数分别为:0.86、0.85、0.73和0.88,偏差Bias均在36.7w/m^2以下,潜热、感热和地表热通量密度观测日积分值分别占净辐射的28.8%、53.4%和3.4%。WRF模式也能较好地模拟出东北半干旱区夏季地表辐射与能量分量的区域分布特征。
基金Under the auspices of National Environmental Protection Public Welfare Industry Research Fund(No.2011467032)
文摘Wetlands are sensitive to climate change, in the same time, wetlands can influence climate. This study analyzed the spa- rio-temporal characteristics of wetland change in the semi-arid zone of Northeast China from 1985 to 2010, and investigated the impact of large area of wetland change on local climate. Results showed that the total area of wetlands was on a rise in the study area. Although natural wetlands (marshes, riparians and lakes) decreased, constructed wetlands (rice fields) increased significantly, and the highest in- crease rate in many places exceeded 30%. Anthropogenic activities are major driving factors for wetland change. Wetland change pro- duced an impact on local climate, mainly on maximum temperature and precipitation during the period of May-September. The increase (or decrease) of wetland area could reduce (or increase) the increment of maximum temperature and the decrement of precipitation. The changes in both maximum temperature and precipitation corresponded with wetland change in spatial distribution. Wetland change played a more important role in moderating local climate compared to the contribution of woodland and grassland changes in the study area. Cold-humid effect of wetlands was main way to moderating local climate as well as alleviating climatic wanning and drying in the study area, and heterogeneity of underlying surface broadened the cold-humid effect of wetlands.