长江科学院院报2024，Vol.41Issue(11)：181-188,8.DOI:10.11988/ckyyb.20230870
北大西洋涛动对长江源区径流的影响
Influence of North Atlantic Oscillation on Runoff in the Source Region of the Yangtze River
摘要
Abstract
Based on runoff series from the Tuotuohe and Zhimenda hydrological stations,we use the North Atlantic Oscillation Index(NAOI)to analyze the intensity of the North Atlantic Oscillation(NAO)and the impact of NAO on winter,summer,and annual runoff at the two stations.The impact of changes in wet and dry conditions was ana-lyzed using correlation analysis and cross-wavelet transform to examine the multi-scale correlation characteristics be-tween the NAO and runoff.The possible impact of NAO on runoff in the source region of the Yangtze River was also analyzed from the perspective of sea-atmosphere coupling affecting atmospheric circulation mechanisms.The re-search results showed that winter runoff was greatly affected by NAO.Before 2000,strong NAO years corresponded to relatively lower runoff probabilities,while weak NAO years corresponded to slightly higher runoff probabilities.Summer runoff was more significantly affected by the temperature in the source region of the Yangtze River.In sum-mer,the response to the strength of NAO was not as obvious as in winter.The NAOI and the runoff at the Tuotuohe and Zhimenda hydrological stations showed good convergence in inter-decadal variation,but there was no close rela-tionship on inter-annual or shorter time scales.There was a resonance cycle between monthly runoff and the NAOI on a time scale of 8-16 months throughout the entire period from 1960 to 2020.Before the 1970s and 1980s,the two stations and the NAOI showed similar frequency and phase changes;after that,they exhibited opposite phase changes.The North Atlantic Oscillation,as the most important climate mode in the North Atlantic region,directly affects the strength of the monsoon and westerly winds through atmospheric teleconnection and Rossby Waves,and then adjusts the water vapor transport over the Qinghai-Tibet Plateau,thereby affecting the temporal and spatial dis-tribution of precipitation and runoff in the source region of the Yangtze River.关键词
北大西洋涛动/径流/相关分析/交叉小波分析/长江源区Key words
North Atlantic Oscillation/runoff/correlation analysis/cross wavelet transform/source area of the Yangtze River分类
天文与地球科学引用本文复制引用
邵骏,卢满生,谢珊,钱晓燕,龚德林,杨坤..北大西洋涛动对长江源区径流的影响[J].长江科学院院报,2024,41(11):181-188,8.基金项目
第二次青藏高原综合科学考察研究项目(2019QZKK0203) （2019QZKK0203）
