河西走廊东部云量时空变化特征

doi:10.11755/j.issn.1006-7639(2015)-06-0979

干旱气象

河西走廊东部云量时空变化特征

1.甘肃省武威市气象局，甘肃武威733000；2.甘肃省武威市乌鞘岭气象站，甘肃武威733000

出版日期:2015-12-31 发布日期:2015-12-31
通讯作者: 杨晓玲，E-mail:wwqxj6150343@163.com
作者简介:张义海（1965- ），男，工程师，主要从事气象服务工作.
基金资助:
国家自然科学基金“气温升高和降水波动对半干旱区春小麦协同影响”(41305134)和甘肃省气象局第七批“十人计划”共同资助

Temporal and Spatial Distribution Characteristics of Cloud Amount in East of Hexi Corridor

1. Wuwei Meteorological Bureau of Gansu Province, Wuwei 733000, China;
2. Wushaoling Meteorological Station of Gansu Province, Wuwei 733000, China

Online:2015-12-31 Published:2015-12-31

摘要/Abstract

摘要：

利用河西走廊东部5个气象站1961～2013年总云量和低云量观测资料，运用线性趋势法、方差分析和累积距平等方法，系统分析了河西走廊东部云量的时空分布及变化特征。结果表明，受地理位置、海拔高度和天气系统的影响，河西走廊东部总云量和低云量均表现为自东北向西南递增的空间分布特征，其中低海拔平原区小于高海拔山区，南部山区天祝最多，沙漠戈壁干旱区民勤最少。近53 a来，河西走廊东部总云量和低云量的年、年代际变化均呈增多趋势，低云量的增多趋势尤为显著（民勤除外）；总云量、低云量的时间序列分布存在5～7 a、5～6 a的准周期变化，且前者突变时间为1997年，后者突变时间1987年和1996年。总云量春季最多、冬季最少，低云量夏季最多、冬季最少。各地各季节总云量近53 a间总体上均呈增多趋势，气候倾向率冬季最大、秋季最小；除民勤外，各地各季节低云量也呈增多趋势，气候倾向率春季最大、冬季最小。总云量和低云量的月变化特征明显且变率较大，总云量的峰值出现在5～6月和9月，低谷出现在12月；低云量的峰值出现在7月（天祝峰值在8月），低谷出现在12月到次年1月。

关键词: 云量, 时空变化, 河西走廊东部

Abstract:

Based on total cloud amount and low cloud amount observation data of 5 meteorological stations in eastern Hexi Corridor during 1961-2013, the temporal and spatial distribution characteristics and variation trends of cloud amount were systematically analyzed by using linear trend coefficient, variance analysis and accumulative anomaly methods. The results show that the spatial distribution of total cloud amount and low cloud amount increased from northeast to southwest because of altitude, geographical position and weather system, cloud amount in mountain area with high altitude was greater than that in plain area with low altitude, and that in Tianzhu of the southern mountain area was the most and in Minqin of the northern desert area was the least. The total cloud amount and low cloud amount in the past 53 years appeared an increasing tendency except for the low cloud amount in Minqin, especially the increase of low cloud amount was significant. The total cloud amount and low cloud amount had 5-7 a and 5-6 a quasi-periodic oscillation, respectively. The mutation of total cloud amount appeared in 1997, while that of low cloud amount happened in 1987 and 1996. Total cloud amount was most in spring and least in winter, while low cloud amount was most in summer and least in winter. The climatic trends of total cloud amount in four seasons increased, and climatic tendency rate was maximum in winter and minimum in autumn. And that of low cloud amount in each season also increased evcept for the decreasing in Minqin, the climatic tendency rate was largest in spring and least in winter. The monthly variations of total and low cloud amount were obvious and great variation in year, the peaks of total cloud amount were from May to June and in September and valley was in December. However, the peak of low cloud amount was in July (Tianzhu was in August) and the valley was from December to next January.

Key words: cloud amount, temporal and spatial distribution characteristics, eastern Hexi Corridor

中图分类号:

P468.0+27

张义海1，杨晓玲1，陈海贝2，马中华1. 河西走廊东部云量时空变化特征[J]. 干旱气象, DOI: 10.11755/j.issn.1006-7639(2015)-06-0979.

ZHANG Yihai1, YANG Xiaoling1, CHEN Haibei2, MA Zhonghua1. Temporal and Spatial Distribution Characteristics of Cloud Amount in East of Hexi Corridor[J]. Journal of Arid Meteorology, DOI: 10.11755/j.issn.1006-7639(2015)-06-0979.

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河西走廊东部云量时空变化特征

Temporal and Spatial Distribution Characteristics of Cloud Amount in East of Hexi Corridor

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