摘要
利用GNIP提供的我国32个站1961~2015年暖半年（4~9月）逐月降水中δ18O、NOAA提供的NCEP/NCAR月平均再分析资料以及实测的月降水量（P）数据，分析了各站点的P、降水中δ18O分别与我国暖半年4条水汽通道的水汽输送强度（Q）之间的相关关系，并对6个代表站δ18O与其所在格点不同风向的水汽输送比例之间的关系进行了讨论和比较。结果表明，与台站降水量相比，降水中δ18O可以更加明确地指示影响该站点的水汽通道和水汽输送的变化。δ18O与西南通道Q-具有显著相关性的站点数最多，达18个，占总站点数的56.3%，这些站点主要位于华北、长江沿线及其以南地区；受东南通道影响的站点集中分布于长江以南地区；有5个站点的δ18O与西北通道Q的相关关系通过了0.05的信度检验；与南海通道Q密切相关的站点数最少，仅有4个。不同来向的水汽输送对站点降水中δ18O的影响差异显著，平均而言，西风水汽输送比例每增加1%，拉萨站δ18O值将增加0.22 ‰，增幅高于昆明站的0.10 ‰和武汉站的0.09 ‰。南风水汽输送比例每增加1%，武汉、拉萨站的δ18O值分别降低0.15 ‰和0.16 ‰，降幅均高于昆明站的0.09 ‰。天津和福州站降水中δ18O分别仅与南风、东风水汽输送比例的关系最为密切，相关系数分别为-0.57和-0.58。兰州站δ18O与经（纬）向的水汽输送比例之间均不存在显著相关性。
Based on the monthly δ18O in precipitation provided by GNIP at 32 stations, the monthly mean reanalysis dataset from NCEP/NCAR offered by NOAA, as well as the monthly precipitation data observed at corresponding stations in the summer half year（from April to September）during 1961~2015 in China, this study analyzes the correlations between the precipitation amount, the δ18O in precipitation at every station and the intensity of water vapor transfer （Q） from 4 vapor inflow corridors in the summer half year in China, discusses and compares the relationships between δ18O at 6 representative stations and the proportions of water vapor transfer of different wind directions at corresponding grid. The results suggest that δ18O value in precipitation can explicitly indicate the changes of vapor inflow corridors and the water vapor transfer compared with the precipitation amount in stations. In particular, the number of stations which have significant correlations between δ18O and Q of southwest corridor are the most with 18 stations in total, which account for 56.3% of all stations. These stations mainly centralize in north China, along the Changjiang River and areas south of it. The stations controlled by southeast corridor are largely in areas south of the Changjiang River. There are 5 stations whose correlations between δ18O and Q of northwest corridor pass the reliability testing by 0.05. Only 4 stations that their δ18O in precipitation are closely related to the Q of South China Sea corridor. The water vapor transfer of different direction has distinct impact on the δ18O value in precipitation. On average, there will be 0.22 ‰ increase in δ18O per 1% increase in the proportions of west wind water vapor transfer at Lhasa Station, which is higher than Kunming Station（0.10 ‰）and Wuhan Station（0.09 ‰）. While each 1% increase in the proportions of south wind water vapor transfer, there will be 0.15 ‰ decrease at Wuhan Station and 0.16 ‰ at Lhasa Station in δ18O, respectively, both of th
出处
《第四纪研究》
CAS
CSCD
北大核心
2018年第2期314-326,共13页
Quaternary Sciences
基金
国家自然科学基金项目（批准号：41571021）和湖南省重点学科建设项目（批准号：20160001）共同资助
关键词
暖半年(4~9月)
降水
氧稳定同位素
水汽通道
水汽输送
summer half year（from April to September）
precipitation
oxygen stable isotopes
vapor inflowcorridor
water vapor transfer
