Isotopes in precipitation in China (1986-1999)

The relation between delta O-18 in precipitation and surface air temperatur e for stations over mid- and high-latitude regions in China is different fr om that for other stations of China. The former is a direct correlation. An d the latter is a negative correlation, the yearly average delta O-18-tempe rature coefficient at Haikou station is -0.42 parts per thousand/degreesC, and is the same as that of the Hong Kong station, both of them represent a tropical monsoon-type climate. Over high latitude regions, the yearly avera ge delta O-18-temperature coefficient is about 0.40 parts per thousand/degr eesC, and is the same as the monthly average delta O-18-temperature coeffic ient for example, Lanzhou station:0.35, Zhangyie station: 0.46, Urumqi: sta tion: 0.42. In Shijiazhuang station over mid latitude regions, the monthly average delta O-18-temperature coefficient (about 0.11 parts per thousand/d egreesC) is smaller than the yearly average delta O-18-temperature coeffici ent (0.34 parts per thousand/degreesC). And the delta O-18-temperature coef ficient of palaeoclimatic in North China Plain (about 0.36 parts per thousa nd/degreesC) is close to the value derived from yearly average delta O-18 i n precipitation and surface air temperature in Shijiazhuang station (0.34 p arts per thousand/degreesC). So the yearly average delta O-18-temperature c oefficient (about 0.40 parts per thousand/degreesC) derived from stations o ver mid- and high-latitude regions in China can be used to discuss palaeocl imatic conditions.