Zhang Dongliang, Yang Yunpeng, Lan Bo
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 Beijing South Road, Urumqi, 830011, China.
University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China.
Sci Rep. 2018 Feb 19;8(1):3238. doi: 10.1038/s41598-018-21637-x.
The Holocene drying trend in the northern Altai Mountains and the wetting trend in the southern Altai Mountains inferred from the paleoclimatic studies indicated it is needed to understand the modern climatic characters in this region. However, a detailed analysis of modern climate variations in the northern and southern Altai Mountains is lacking. Here, we investigate the monthly temperature and monthly precipitation data from seventeen meteorological stations during 1966-2015 in the northern and southern Altai. The result shows that temperature increases significantly in the northern (0.42 °C/10 yr) and in the southern (0.54 °C/10 yr). The precipitation decreases insignificantly (-1.41 mm/10 yr) in the northern, whereas it increases significantly (8.89 mm/10 yr) in the southern. The out-of-phase relationship of precipitation changes is also recorded at different time-scales (i.e., season, year, multi-decades, centennial and millennial scales), indicating the Altai Mountains are an important climatic boundary. Based on the analysis of modern atmosphere circulation, the decreased precipitation in the northern corresponds to the decreasing contribution of 'Northern meridional and Stationary anticyclone' and 'Northern meridional and East zonal' circulation and the increased precipitation in the southern are associated with the increasing contribution of 'West zonal and Southern meridional' circulation.
古气候研究推断，阿尔泰山脉北部全新世呈干燥趋势，而南部呈湿润趋势，这表明有必要了解该地区的现代气候特征。然而，目前缺乏对阿尔泰山脉北部和南部现代气候变化的详细分析。在此，我们研究了1966 - 2015年期间阿尔泰山脉北部和南部17个气象站的月气温和月降水量数据。结果表明，北部（0.42°C/10年）和南部（0.54°C/10年）的气温均显著升高。北部降水量略有下降（-1.41毫米/10年），而南部降水量显著增加（8.89毫米/10年）。在不同时间尺度（即季节、年、数十年、百年和千年尺度）上也记录到了降水变化的反位相关系，这表明阿尔泰山脉是一个重要的气候边界。基于对现代大气环流的分析，北部降水量减少与“北经向和静止反气旋”以及“北经向和东纬向”环流贡献的减少相对应，而南部降水量增加与“西纬向和南经向”环流贡献的增加相关。
