[Moisture sources of Guangzhou during the freezing disaster period in 2008 indicated by the stable isotopes of precipitation].
From April 2007 to June 2008, stable isotope samples of all single precipitations were collected at the intervals of 5-30 min. We choose five single precipitations in Guangzhou city that happened during the freezing disaster event (from Jan. 10 to Feb. 2, 2008) in South China, aiming to investigate the variation of stable isotopes under the extremely climatic conditions and its controlling factors. The results show that the values of deltaD and delta18O in precipitations drop significantly during this freezing disaster. The analyses of the d-excess and LMWL indicate the abnormal oceanic moisture sources. Air mass trajectory tracking shows the moisture sources were characterized by the mixture of inland and marine water vapors during the freezing disaster peak period, while the long-distance oceanic moisture sources is the dominate one. Changes of stable isotope in single rain event during the freezing disaster shows three different trends, i. e, Up trend, V-shaped trend and W-shaped trend, which may be resulted from the re-evaporation, re-condensation and the related precipitation types in association with the different vapor sources and precipitation conditions.
School of Geography Science, South China Normal University, Guangzhou 510631, China. lccy325@126.com
Cong-Yun
CY
Liao
Wei
W
Zhong
Qiao-Hong
QH
Ma
Ji-Bin
JB
Xue
Huan-Ling
HL
Yin
Kun
K
Long
D002681:China; D002947:Cities; D004190:Disasters; D004784:Environmental Monitoring / Q000379:methods; D005615:Freezing; D010103:Oxygen Isotopes / Q000032:analysis*; D011891:Rain; D012914:Snow
D010103:Oxygen Isotopes