REOF ANALYSIS OF CLIMATIC CHARACTERISTICS OF WINTER TEMPERATURE AND HUMIDITY ON XIZANG-QINGHAI PLATEAU

Niu Tao; Chen Longxun; Wang Wen

Vol.13, NO.5, 2002

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2002 > 13(5): 560-570

Niu Tao, Chen Longxun, Wang Wen. REOF analysis of climatic characteristics of winter temperature and humidity on Xizang-Qinghai Plateau. J Appl Meteor Sci, 2002, 13(5): 560-570.

Citation:

Niu Tao, Chen Longxun, Wang Wen. REOF analysis of climatic characteristics of winter temperature and humidity on Xizang-Qinghai Plateau. J Appl Meteor Sci, 2002, 13(5): 560-570.

Niu Tao, Chen Longxun, Wang Wen. REOF analysis of climatic characteristics of winter temperature and humidity on Xizang-Qinghai Plateau. J Appl Meteor Sci, 2002, 13(5): 560-570.

Citation:

Niu Tao, Chen Longxun, Wang Wen. REOF analysis of climatic characteristics of winter temperature and humidity on Xizang-Qinghai Plateau. J Appl Meteor Sci, 2002, 13(5): 560-570.

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REOF ANALYSIS OF CLIMATIC CHARACTERISTICS OF WINTER TEMPERATURE AND HUMIDITY ON XIZANG-QINGHAI PLATEAU

Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2001-06-28
Rev Recd Date: 2001-08-23
Publish Date: 2002-10-31

Abstract

Abstract

The Analysis of climatic characteristics of temperature and humidity on the Xizang-Qinghai Plateau is made based on the data set from 123 stations on the Xizang-Qinghai Plateau and its vicinity. The results indicate that the region near 32°-33°N may be the divide of the climatic difference from south to north on the plateau. The northern plateau is influenced by dry and cold air and the southern by humid and warm air. Using the REOF method, we can separate the temperature and humidity on the plateau into different patterns and then analyze the characteristic of each pattern. The results indicate that in recent 40 years temperature has been increasing gradually, fluctuating with time. The temperature increase occurred mainly in the periods of 1978 to 1981 and 1983 to now, and the increase in the last period is the greatest. The amplitude of the temperature increase takes on a pattern of "big-small-big" from south to north on the plateau. The humidity in recent 40 years is also on the increase trend fluctuating with time in most part of the plateau, but the northern boundary of the plateau become drier. The main period of humidity increase is the late 1980s. The amplitude of humidity increase takes on a pattern "big-small" from south to north on the plateau; especially, the region around Qilian Mountain become drier.
- Xizang-Qinghai Plateau;
- Temperature;
- Humidity;
- Climatic variation;
- REOF analysis

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References(9)

Figures and Tables

图 1 青藏高原123个观测站位置分布图

(图中虚线为海拔高度, 圆圈为测站位置)

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图 2a 1961~1998年青藏高原冬季平均温度分布 (℃)

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2b 1961~1998年青藏高原冬季平均温度随海拔高度分布散布图

(其中圆点为33°N以北高原地区, 三角为33°N以南高原地区)

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图 3a 1961~1998年青藏高原冬季平均相对湿度分布 (%)

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3b 1961~1998年青藏高原冬季平均相对湿度随海拔高度分布散布图

(说明同图 2b)

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图 4 1961~1998年青藏高原冬季平均温度REOF分析的前6个模态 (a~f)

(第1模态:高原东北部型; 第2模态:高原东南部型; 第3模态:塔里木盆地型; 第4模态:祁连山型; 第5模态:中南部—东界型; 第6模态:高原中东部型)

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图 5 青藏高原冬季温度REOF分析前两个模态时间系数 (虚线) 及其高荷载区站点平均所得的温度变化曲线 (实线)(a) 第一模态; (b) 第二模态

(直线为实线的线性倾向 (k为其斜率) 为了便于比较, 图中各时间系数已乘0.05)

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图 6 1961~1998年冬季青藏高原各地区 (从南到北) 温度距平分布 (台站观测值, 单位:℃)

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图 7 1961~1998年青藏高原冬季平均相对湿度REOF分析的前8个模态 (a~h)

(第1模态:青川藏交界型; 第2模态:青甘川交界型; 第3模态:高原东北部型; 第4模态:中南部─东南界型; 第5模态:高原东南部型; 第6模态:祁连山型; 第7模态:塔里木盆地型; 第8模态:横断山型)

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图 8 1961~1998年冬季青藏高原各地区 (从南到北) 相对湿度距平分布 (台站观测值, 单位:%)

(图中纵坐标“青川藏”指青川藏交界地区, “青甘川”指青甘川交界地区)

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表 1a EOF分析各模态的累积方差贡献及特征值

1b REOF分析各模态的累积方差贡献

表 2 青藏高原冬季温度REOF分析各模态高荷载区所对应的代表站

表 3 青藏高原冬季平均相对湿度REOF分析各模态高荷载区所对应的代表站

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