JOURNAL OF NATURAL RESOURCES ›› 2014, Vol. 29 ›› Issue (6): 1043-1052.

• Resources Evaluation •

### Stable Oxygen Isotope in Precipitation in Relation to the Meteorological Factors and the Moisture Sources in Yunnan

LI Guang1, ZHANG Xin-ping1, WU Hua-wu1, ZHANG Jian-ming2, WEI Nai-qiong1, HUANG Huang1

1. 1. College of Resources and Environment Sciences, Hunan Normal University, Changsha 410081, China;
2. Hunan Climate Center, Changsha 410007, China
• Received:2013-06-28 Revised:2013-11-04 Published:2014-06-24

Abstract:

Based on the data of precipitation samples and meteorological facters from Jan. 2009 to Dec. 2011 in Kunming, Tengchong and Mengzi of Yunnan Province. In combination with the data of the European Centre for Medium-range Weather Forecasts and the NCEP/NCAR, the relationships between the δ18O in precipitation and the precipitation amount, temperature and air pressure on the synoptic timescale were analyzed of the three stations. We also analyzed the relationships between the δ18O in precipitation and the wind speed of different heights. The results indicated that under the synoptic timescales, there was significant negative correlation between the δ18O in precipitation and the precipitation amount, temperature and air pressure. It suggested that the variations of the δ18O in precipitation had significant precipitation amount effect, anti-temperature effect and humidity effect. At the same time, there was significant positive correlation between the δ18O in precipitation and the different heights wind speed, this indicated that the wind speed of different heights was also an important factor in changing the δ18O in precipitation at some way. Taking advantage of the HYSPLIT 4.8 to track the trajectory of moisture sources in Kunming, Tengchong and Mengzi, we found that the moisture sources at the three stations were the same, the result indicated that the three stations were in the same water vapour channel. During the wet seasons (May-September), the moisture sources mainly came from the Bay of Bengal, the Arabin Sea and the South China Sea. However, the δ18O in precipitation during the wet seasons was lower. During the dry seasons (October-next April), the moisture sources maily came from westerly wind belt carried the inland water vapour and the local water vapour circulation. The δ18O in precipitation during the dry seasons was higher.

CLC Number:

• P426.61+2