Changes in the Proportion of Precipitation Occurring as Rain in Northern Canada during Spring–Summer from 1979–2015  

作　　者：Wei HAN Cunde XIAO Tingfeng DOU Minghu DING 

机构地区：[1]Nanjing University of Information Science and Technology,Nanjing 210044,China [2]Institute of Polar Meteorology,Chinese Academy of Meteorological Sciences,Beijing 100081,China [3]State Key Laboratory of Earth Surface and Resource Ecology,Beijing Normal University,Beijing 100875,China [4]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Advances in Atmospheric Sciences》2018年第9期1129-1136,共8页大气科学进展（英文版）

基　　金：supported by the National Key Basic Research Program of China(Grant No.2013CBA01804);the National Science Foundation of China(Grant Nos.41425003 and 41401079);the State Oceanic Administration of the People’s Republic of China Project on Climate in Polar Regions(Grant No.CHINARE2016-2020);the Key Research Program of the Chinese Academy of Sciences(Grant No.KJZD-EW-G03);the Opening Founding of the State Key Laboratory of Cryospheric Sciences(Grant No.SKLCS-OP-2016-03)

摘　　要：Changes in the form of precipitation have a considerable impact on the Arctic cryosphere and ecological system by influencing the energy balance and surface runoff. In this study, station observations and ERA-Interim data were used to analyze changes in the rainfall to precipitation ratio（RPR） in northern Canada during the spring–summer season（March–July）from 1979–2015. Our results indicate that ERA-Interim describes the spring–summer variations and trends in temperature and the RPR well. Both the spring–summer mean temperature [0.4℃–1℃（10 yr）^（-1）] and the RPR [2%–6%（10 yr）^（-1）] increased significantly in the Canadian Arctic Archipelago from 1979–2015. Moreover, we suggest that, aside from the contribution of climate warming, the North Atlantic Oscillation is probably another key factor influencing temporal and spatial differences in the RPR over northern Canada.Changes in the form of precipitation have a considerable impact on the Arctic cryosphere and ecological system by influencing the energy balance and surface runoff. In this study, station observations and ERA-Interim data were used to analyze changes in the rainfall to precipitation ratio（RPR） in northern Canada during the spring–summer season（March–July）from 1979–2015. Our results indicate that ERA-Interim describes the spring–summer variations and trends in temperature and the RPR well. Both the spring–summer mean temperature [0.4℃–1℃（10 yr）^（-1）] and the RPR [2%–6%（10 yr）^（-1）] increased significantly in the Canadian Arctic Archipelago from 1979–2015. Moreover, we suggest that, aside from the contribution of climate warming, the North Atlantic Oscillation is probably another key factor influencing temporal and spatial differences in the RPR over northern Canada.

关 键 词：climate change rainfall to precipitation ratio northern Canada North Atlantic Oscillation 

分 类 号：P426.614[天文地球—大气科学及气象学]