摘要
利用1961～2000年黄土高原56站的春季降水、气温资料,用SVD方法分析了其与青藏高原感热场的关系。结果表明,降水量与青藏高原感热场的前两模态代表了两场间的主要耦合特征;上年冬季和秋季青藏高原感热场的异常通过影响大气环流,能够导致次年黄土高原春季降水异常; 青藏高原感热对黄土高原西部和南部、北部的部分地区影响较显著,而对陕西北部、山西中部影响不明显。前期高原感热场SVD第一、二模态的变化,可以作为黄土高原春季降水异常的预测信号。
Based on spring temperature and precipitation data derived from 56 stations in Loess Plateau during 1961~2000, using Singular Value Decompositions (SVD) technique, the relationships between sensible heat field over Tibetan Plateau and spring precipitation on Loess Plateau were analyzed. Results show that the first two patterns from SVD indicate the key coupled characteristic of sensible heat and spring precipitation fields with closely temporal and spatial correlation, the abnormity of sensible heat field in previous autumn and winter would influence general circulation and lead to anomalies of spring precipitation, and the sensible heat has more notable effect on west and south , the part of north region of Loess Plateau than that on north of Shaanxi and middle of shanxi province . The first two patterns variation of the previous sensible heat field over Tibetan Plateau derived from SVD could be the predictor signal for the spring precipitation anomaly in Loess Plateau.
出处
《干旱气象》
2005年第1期21-25,共5页
Journal of Arid Meteorology
基金
甘肃省气象局2002年青年科技资金"青藏高原感热对黄土高原春旱变化的影响"(甘气发(2002)172号)资助
关键词
黄土高原
春季降水
SVD方法
青藏高原感热
Loess Plateau
spring precipitation
Singular Value Decomposition(SVD) technique
sensible heat over Tibetan Plateau
