贺州市干旱气候特征及其成因分析

Analysis on Arid Climatethe Characteristics and Its Causes

选取1971-2009年贺州市气象观测资料及环流指数资料,分析了贺州市平均气温年际变化及干旱的气候特征,并以2003-2009年为例,利用天气学方法对干旱的成因进行分析。结果表明：干旱期间北半球500 hPa极涡中心偏于西半球,西太平洋副热带高压长时间稳定控制华南地区,强度偏强,面积指数偏大。对此,提出了相应的防御对策,对工农业生产及农业减灾防灾具有一定的指导意义。

The interannual variation of average temperature and arid climatethe characteristics in Hezhou were analyzed using the meteorological observation data and circulation index from 1971 to 2009.Taking 2003-2009 as examples,the causes of arid climatethe were analyzed.The results showed that the development of drought during the northern hemisphere polar vortex center 500 hPa deflected western hemisphere,the Western Pacific subtropical high stably controlled South China for a long time with stronger intensity and larger area index.The characteristics and causes of arid climate were analyzed.The corresponding defensive countermeasures were proposed,which were helpful for industrial and agricultural production and agricultural disaster prevention and reduction.