| 民勤西沙窝生态气候变化特征 |
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| 引用本文： | 常兆丰.民勤西沙窝生态气候变化特征[J].气象,2000,26(5):48-50. |
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| 作者姓名： | 常兆丰 |
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| 作者单位： | 甘肃省治沙研究所,武威,733000 |
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| 摘 要： | （１）分析得到勤试验站１３个观测指标中的１４５个统计项中的前６个主成分最大载荷因子的多年变化特征是：年日照时数７０￣８０年代持续下降；年平均气温６０￣８０年代下降；年大风日数呈波浪式上升；年最大风速有增无减；８月降水量相对稳定。当地的气候环境在８０年代中期以前朝良性方向发展，８０年代中期以来进一步恶化。（２）年沙法暴日数的多年变化特征与年日照时数有较大的相似性；年平均最高气温、年平均地温和７月份极
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| 关 键 词： | 沙漠气候 生态气候变化 主成分分析 民勤西沙窝 |
Analysis on the Characteristics of Climate Change in Xishawo Desert in Minqin |
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| Chang Zhaofeng.Analysis on the Characteristics of Climate Change in Xishawo Desert in Minqin[J].Meteorological Monthly,2000,26(5):48-50. |
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| Authors: | Chang Zhaofeng |
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| Abstract: | The changing characteristics of maximum loading factors of the first 6 principal components in Principal Component Analysis (PCA) on 145 statistical items of 13 observed indexes were:annual sunshine hours decreased gradually during the 1970s and the 1980s,but it has increased evidently since the begining of the 1990s:and there was a decreasing trend in annual average temperature from the 1960s to the 1980s,but it has rised evidently since the 1990s;average wind velocity in October gradually reduced from the mid 1970 to the mid 1980s,then increased;the days of annual strong wind increased wavily;annual maximum wind velocity constantly lifted the change of rainfall in August.The local climatic conditions had a good developing trend before the middle of 1980s,but since the late 1980s it has been deteriortated.(2)The change of annual sandstorm days was similar to annual sunshine hours;the distributing characters of annual maximum temperature,annual average ground temperature and maximum temperature in July were similar to annual average temperature;the distributing character of annual strong wind days was similar to the average wind velocity in October.(3)The climatic condition had shown some improvements from the mid 1960s to the mid 1980s due to trees planted and shrubs in large scale since the 1960s,and it was deteriorating since the late 1980s concerned with the drop of groud water table and died off of man made sand fix forest. |
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| Keywords: | climate change characteristics principal component analysis |
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