白银市近48 a地表干湿状况及变干趋势

J4 ›› 2006, Vol. 24 ›› Issue (3): 52-56.

白银市近48 a地表干湿状况及变干趋势

景怀玺¹，李富洲¹，白虎志²

收稿日期:2006-04-24 修回日期:2006-06-05 出版日期:2006-09-30 发布日期:2006-09-30
作者简介:景怀玺(1964一)，甘肃会宁人，工程师，主要从事天气气候预测预报工作

Surface Dryness/Wetness State and Its Tendency in Baiyin City for Recent 48 Years

JING Huai-xi¹, LI Fu-zhou¹, BAI Hu-zhi²

1.Baiyin Meteorological Bureau of Gansu Province, Baiyin 730900, China;
2.Institute of Arid Meteorology,CMA,Lanzhou 730020,China

Received:2006-04-24 Revised:2006-06-05 Online:2006-09-30 Published:2006-09-30

摘要/Abstract

摘要：

利用1958 -2005年48 a白银市4个站的月降水量、月平均气温和相对湿度资料，计算了各站历年的湿润度指数，并利用湿润度指数对地表干湿状况进行分析。结果表明，白银市地表状况整体上反映出明显的干旱特征。在此背景下，不仅呈现“北干南湿”地域分布上的差异性，而且在干湿交替中出现了景泰、白银、靖远偏北地方有8~10 a的年代际准周期变化，偏南地方有3~10 a的年际准周期变化，并在年际变化中呈缓慢变干趋势，这种状况可能是由于降水量减少和气温升高直接造成的。

关键词: 湿润度指数, 地表水分盈亏, 影响分析

Abstract:

Based on monthly precipitation, monthly mean temperature and relative humidity of four meteorological stations in Baiyin city from 1958 to 2005, the yearly surface wetness index was calculated. The results show that the surface condition of Baiyin presented visible arid characteristic on the whole, under this background, there was not only difference in local distribution of“dry in the north and wet in the south” but also presented a quasi-periodical variation of 8-10 years in some northern localities such as Jingtai, Baiyin and Jingyuan, and 3 to 5 years quasi-periodical variation in some southern localities. The trend of turning drier slowly in interannual variation was presented, and it might result directly from precipitation decrease and temperature increase these years.

Key words: font-family: "Times New Roman", mso-bidi-font-size: 12.0pt, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体">wetness index, water budget, influence analysis

中图分类号:

P463.1

景怀玺, 李富洲, 白虎志. 白银市近48 a地表干湿状况及变干趋势[J]. J4, 2006, 24(3): 52-56.

JING Fu-Xi, LI Fu-Zhou, BAI Hu-Zhi.

Surface Dryness/Wetness State and Its Tendency in Baiyin City for Recent 48 Years

[J]. J4, 2006, 24(3): 52-56.