【摘要】 根据全球降水中稳定同位素监测网络GNIP我国黑龙江地区监测站点（哈尔滨站和齐齐哈尔站）同位素及气象数据资料,结合美国气象中心NCEP\NCAR逐月再分析数据,讨论年际尺度和季节尺度下研究区降水中δ¹⁸O、气温、降水量的变化规律,探讨两站点不同降水类型下δ¹⁸O-δD相关性以及同位素效应,并利用水汽通量模型追踪季节上影响研究区的降水气团差异,分析水汽输送过程中两站点间的关系.结果表明:（1）黑龙江地区大气降水中δ¹⁸O值总体较低,并表现出冬季低值和夏季高值的变化;（2）两站点不同降水类型δ¹⁸O-δD相关性如下:齐齐哈尔站点(δD=7.58δ¹⁸O-0.14,R=0.98,n=50),哈尔滨站点(δD=5.52δ¹⁸O-19.42,R=0.83,n=30),降雪样品较降雨样品具有高的斜率和截距值（7.54,-3.15）,这主要和水汽相变过程中的再蒸发有关.在年际尺度与年内尺度上,大气降水中δ¹⁸O与温度均表现出明显的正相关(δ¹⁸O=0.35T-16.26,R=0.53,n=80;δ¹⁸O=0.17T-13.09,R=0.27,n=10;δ¹⁸O=0.08P-19.34,R=0.42,n=12),与降水量相关性不显著;（3）结合黑龙江地区水汽通量分析发现,夏季降水受到来自太平洋的暖湿水汽影响,冬季风期间降水形式以降雪为主,受到蒙古-西伯利亚高压及西风带水汽和内陆水汽再蒸发的影响.更多还原

【Abstract】 Based on the original data from two Chinese GNIP observation stations（in Harbin and Qiqihar）and the reanalysis data of National Centers for Environmental Prediction-National Center for Atmospheric Research（NCEP/NCAR）of NOAA,this study investigated the variations of stable isotopes,temperature and precipitation amount in interannual and seasonal patterns,and then explained the amount effect and temperature effect ofδ¹⁸O in rainfall and snowfall.Using a vapor flux model and wind vector analysis to monitor the precipitation air masses in the two study areas,we analyzed the differences in water vapor transport between Harbin and Qiqihar.The results suggested that variations ofδ¹⁸O in precipitation in Heilongjiang exhibited a significant seasonal variability and was generally lower than in other monsoon regions.The Local Meteoric Water Line（LMWL）of Qiqihar(δD=7.58δ¹⁸O-0.14,R=0.98,n=50)and Harbin(δD=5.52δ¹⁸O-19.42,R=0.83,n=30)were calculated.We found that the snowfall samples had a higher slope and intercept than rainfall samples,indicating an isotopic fractionation pattern induced by a non-equilibrium secondary evaporation during the process of falling,which occurred as a result of rayleigh distillation.In interannual and seasonal patterns,δ¹⁸O was in a significant positive correlation with temperature(δ¹⁸O=0.35 T-16.26,R=0.53,n=80;δ¹⁸O=0.17 T-13.09,R=0.27,n=10;δ¹⁸O=0.08 P-19.34,R=0.42,n=12)and in an insignificant correlation with precipitation amount.According to the wind vector field and the moisture flux vector analysis,we found that the moisture sources during summer were mainly influenced by warm watervaper of the Pacific Ocean,while the form of precipitation was mainly snowfall during winter seasons,which moisture sources were closely related to the cold wapervaper from the Mongolia and Siberian High,westerly vapor transportation and local re-evaporation.更多还原