单 位：
山西师范大学地理科学学院;重庆旅游职业学院
关键词：
降水同位素;ENSO;OLR场;ITCZ;福州
摘 要：
ENSO事件背景下的水汽源区变化在很大程度上影响着季风区水循环过程,基于福州的降水同位素及气象数据,研究了ENSO背景下δ~(18 )O的时空分布特征,并利用OLR(向外长波辐射)技术进一步探索降水中氢氧同位素特征对ENSO事件及水汽源区变化的响应机制。结果表明:水汽源区变化主要通过影响降水的年内分配,特别是雨季降水的时间分配状况影响δ~(18 )O的年际变化;各事件年大气降水线方程有着规律性的变化,拉尼娜年凸显出海洋性较强的气候特征;厄尔尼诺年减弱雨季降水量效应而增强旱季反温度效应,拉尼娜年则削弱旱季反温度效应;通过OLR场反演的水汽源区变化与福州稳定同位素特征有着较强的对应关系,西太平洋水汽源区的位置与对流强度的变化是ENSO事件年中影响福州降水稳定同位素变化的主要因素。
译 名：
Mechanism of the Response of Stable Isotopes of Precipitation to ENSO Events in Fuzhou
作 者：
ZHANG Xiaodong;GUO Zhengsheng;Chongqing Vocational Institute of Tourism;College of Geographical Sciences, Shanxi Normal University;
关键词：
stable isotopes;;ENSO;;OLR field;;ITCZ;;Fuzhou
摘 要：
The variation of moisture sources under the background of ENSO has a great influence on the hydrological cycle process in monsoon area. Based on the precipitation isotope and meteorological data of Fuzhou, the temporal and spatial distribution characteristics of δ~(18 )O were studied under the background of ENSO, and the mechanism of response of hydrogen and oxygen isotopic characteristics of precipitation to ENSO events was further explored by OLR technology. The results show that the variation of moisture source prominently affects the annual distribution of precipitation, especially the temporal distribution of precipitation in rainy season, which affects the interannual change of δ~(18 )O; the Meteoric Water Line of each ENSO event changes regularly, and the La Nina year highlights the stronger oceanic characteristics; the El Nino year weakens the precipitation effect in rainy season. Meanwhile, the anti-temperature effect in dry season is strengthened, while that in La Nina year is weakened; the variation of moisture sources inverted by OLR field strongly corresponds to the stable isotope characteristics in Fuzhou, and the changes of location and convective intensity of moisture sources in the western Pacific Ocean are the main factors causing the stable isotope variation of precipitation in Fuzhou during ENSO event year.
