湿润指数H在西北地区的适用性  

The applicability of the humidity index H in Northwest China

作　　者：赵艳茹[1] 赵志远[1] 党张利 张文煜[1] 

机构地区：[1]兰州大学大气科学学院,甘肃省干旱气候变化与减灾重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2015年第2期212-216,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展计划(973计划)项目(2012CB956200);国家自然科学基金项目(41225018)

摘　　要：选取西北地区酒泉、榆中、庆阳3个背景不同的国家基准站站点作为研究对象,利用其1954-2010年的气象站常规资料,对湿润指数H在西北地区的适用性做了分析研究,结果表明:在西北地区年尺度分析中H值能够较好地表征干湿变化情况,但在季、月尺度分析中,H值出现了较多极端值,通过与湿润指数M值相比较并进行分析,认为这些极端值是不合理的;结合地区特点,通过分析将Thornthwaite计算方法中临界值调整为2.5?C,H值变化范围由原来的0～1 081.524变为0～4.790,有效地滤去了极端值,相对于调整前,调整后的湿润指数H1能够更好地适用于西北地区的干湿变化分析.Three different national benchmark stations of different background in Jiuquan, Yuzhong and Qingyang in Northwest China were selected as the research objects, and using the conventional data thereof from 1954 to 2010, the applicability of the humity index H was studied. The results show that in the seasonly and monthly analysis of Northwest drought-wet changes, the H value change was not reasonable because of the appearance of more extreme values, and in the yearly analysis, the H value change was more reasonable. In combination with regional characteristics, we adjusted the critical value of the Thornthwaite calculation method to 2.5℃, effectively filtered the extreme values, and found that the H＇s value changing trend with M was basically identical, the floating range turned to 0~4.790, relative to the previous 0~1 081.524. Thus the adjusted humity index H1 can be more suitable for a drought-wet change analysis of northwest areas of China.

关 键 词：西北地区 湿润指数H 适用性 参数调整 

分 类 号：P413.2[天文地球—大气科学及气象学]