摘要
印度洋偶极子(Indian Ocean Dipole,IOD)这一气候因子对印度洋周边乃至全球气候产生重要影响,在最近20多年中受到越来越多的关注;但目前尚不清楚其是否对华南沿海地表风速变化产生影响。文章依据中国华南沿海地区地表风速观测资料和最近20多年来对IOD的研究成果,应用统计分析和大气环流变化对这一问题进行分析。结果发现,除了以往提到的高—低纬度温差、北极涛动(Arctic Oscillation,AO)、太平洋年代际振荡(Pacific Decadal Oscillation,PDO)和厄尔尼诺-南方涛动(El Niño-Southern Oscillation,ENSO)外,IOD活动也是影响华南沿海地区地表风速变化的重要因素之一。IOD活动的影响弱于高—低纬度温差;但相对于AO、PDO和ENSO,IOD活动对该地区地表风速的变化产生更为重要的影响。特别是伴随全球变暖的IOD活动加强是造成华南沿海地区秋季地表风速下降的重要因素。
Wind speed is an important parameter reflecting the climate and environmental conditions on the Earth's surface.It is also a pivotal factor influencing wind energy,a renewable and clean energy source.The mechanisms exerting influence on the surface wind speed over China,which have been mentioned in previous studies,include the temperature difference between the high and low latitudes of China,surface drag force,and climatic factors such as the Arctic Oscillation(AO),Pacific Decadal Oscillation(PDO),and El Niño-Southern Oscillation(ENSO).The Indian Ocean Dipole(IOD),which has attracted increasing attention during the past two decades,is an important climatic factor that exerts a significant influence on the climate and environment in the areas surrounding the Indian Ocean and globally.However,to date,it has not been reported whether the IOD is a climatic factor that significantly affects surface wind speed in China.Coastal South China is one of the most economically developed areas in China,and wind energy is becoming an important energy source in this area.An investigation of the relationship between the IOD and wind speed variations in coastal South China and their connecting mechanisms would contribute substantially to the understanding of the controlling mechanisms of climatic and environmental variations in coastal South China as well as to the planning of sustainable development in this area.Based on observations of surface wind speed in coastal South China,reanalysis data from the National Center of Environment Prediction(NCEP)and the National Center of Atmospheric Research(NCAR),research on the IOD over the last two decades,the effects of IOD activities on surface wind speed in coastal South China,and the controlling mechanisms were investigated using statistical analyses and atmospheric circulation variations.The results indicate that,regardless of the temporal or spatial scale,variations in the surface wind speed in coastal South China show significant positive correlations with the dipole mode index(DM
作者
严晟江
谢宇
周厚云
Yan Shengjiang;Xie Yu;Zhou Houyun(School of Geography,South China Normal University,Guangzhou 510631,China)
出处
《热带地理》
CSCD
北大核心
2024年第4期673-684,共12页
Tropical Geography
基金
国家自然科学基金项目(41473093、41271212)。
关键词
印度洋偶极子(IOD)
地表风速
大气环流
华南沿海
Indian Ocean Dipole(IOD)
surface wind speed
atmospheric circulation
coastal South China
