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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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青藏高原地气温差变化分析
DOI: 10.11821/xb200609001, PP. 899-910
Keywords: 青藏高原,地气温差,主成分分析,气温分区
Abstract:
利用青藏高原及其临近区域的99个气象站1960~2000年地表温度和气温资料,利用主成分分析和功率谱分析方法,分析了青藏高原地气温差的空间分布及时间演变特征。结果表明青藏高原地气温差6月份最大,12月份最小。青藏高原冷、暖季和年均的地气温差空间分布前三个载荷向量场大致可表现三种分布型西北-东南反向变化型、地形海拔反映型、冻土分布反映型;载荷所对应的时间演变型单调上升、单调下降型、基本平稳型和具有极小值的下凹抛物线型。高原地气温差的周期振荡在不同区域的显著性不同,普遍出现的是2年左右的周期。依据温差冷季第三主分量载荷的空间分布型,可将高原划分为两大区,即多年冻土影响气温区和季节冻土影响气温区。
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