【摘 要】
：
利用日本气象厅提供的JRA-55再分析资料,对1980-2017年青藏高原冬季热源的时空特征进行了分析.小波分析结果表明,青藏高原的冬季热源在年际尺度上存在阶段性周期变化,其中在4～8 a尺度上的周期振荡较为明显;在年代际尺度上热源具有持续的周期变化特征,在10～16 a尺度上周期振荡最为剧烈,具有12 a左右的主周期.利用集合经验模态分解和小波相干谱探讨了冬季厄尔尼诺-南方涛动(ENSO)和北大西洋涛动(NAO)与青藏高原热源变化之间在多时间尺度上的关系.冬季ENSO和NAO与青藏高原热源之间最显著的联
【机 构】
：
兰州大学大气科学学院,半干旱气候变化教育部重点实验室,兰州730000;兰州大学大气科学学院,半干旱气候变化教育部重点实验室,兰州730000;西部生态安全省部共建协同创新中心,兰州730000;甘肃
论文部分内容阅读
利用日本气象厅提供的JRA-55再分析资料,对1980-2017年青藏高原冬季热源的时空特征进行了分析.小波分析结果表明,青藏高原的冬季热源在年际尺度上存在阶段性周期变化,其中在4～8 a尺度上的周期振荡较为明显;在年代际尺度上热源具有持续的周期变化特征,在10～16 a尺度上周期振荡最为剧烈,具有12 a左右的主周期.利用集合经验模态分解和小波相干谱探讨了冬季厄尔尼诺-南方涛动(ENSO)和北大西洋涛动(NAO)与青藏高原热源变化之间在多时间尺度上的关系.冬季ENSO和NAO与青藏高原热源之间最显著的联系主要发生在年代际尺度上,ENSO与热源存在连续显著的滞后相关,而NAO与热源存在长时间的显著正相关.在年际尺度上,ENSO和NAO与青藏高原热源之间存在不同的阶段性相关关系.
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