引用本文:杨楠, 范广洲.2000-2016年青藏高原土壤温度变化特征分析[J].西南大学学报(自然科学版),2019,41(9):40~51
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2000-2016年青藏高原土壤温度变化特征分析
杨楠, 范广洲
成都信息工程大学 大气科学学院/高原大气与环境四川省重点实验室/气候与环境变化联合实验室, 成都 610225
摘要:
该研究使用较新的、连续性好的、高分辨率(0.25°×0.25°)的GLDAS(Global Land Data Assimilation System)Noah v2.1陆面模式资料,采用线性倾向估计、t检验、相关性分析和经验正交函数分解等方法,分析了2000-2016年青藏高原土壤温度的变化特征.结果表明,土壤温度受地形和海拔影响,高原地区平均土壤温度比周边地区低,北部比南部低.高原西北部的昆仑山脉至阿里地区附近存在-10℃冷中心,高原东北部的柴达木盆地存在5℃暖中心.春秋土壤温度空间分布与平均土壤温度空间分布相似,夏季最暖,冬季最冷.EOF分析土壤温度第一模态均表现出明显的全区一致升温型.进一步分析年际变化发现4层土壤温度逐年升温且变化十分相似.2005年之前几乎呈现线性增温趋势,2005年之后呈现波动变化但仍为增温趋势.趋势系数空间分布发现各层土壤温度均不断增温且空间分布相似,高原地区增温趋势强于周边地区,高原主体部位西部增温强于东部.随着深度的增加,增温趋势逐渐减弱.以0~10 cm为代表层说明增温的主要空间分布特征:高原大部分地区土壤温度均以0.1至0.3℃/10a的速率增温,最大增温中心在阿里北部地区,数值达0.67℃/10a.春季增温最强,秋夏次之,冬季最弱.
关键词:  青藏高原  土壤温度  GLDAS
DOI:10.13718/j.cnki.xdzk.2019.09.006
分类号:S152.8
基金项目:国家自然科学基金项目(91537214);四川省教育厅重点项目(16ZA0203);成都信息工程大学中青年学术带头人科研基金项目(J201516);成都信息工程大学校引进人才启动基金项目(KYTZ201639).
Analysis of Soil Temperature Variation Over the Qinghai-Xizang Plateau from 2000 to 2016
YANG Nan, FAN Guang-zhou
School of Atmospheric Science/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/Joint Laboratory of Climate and Environment Change, Chengdu University of Information Technology, Chengdu 610225, China
Abstract:
Based on GLDAS(Global Land Data Assimilation System) Noah v2.1 land surface pattern data, which has a high resolution (0.25°×0.25°), the characteristics of soil temperature variations in Qinghai-Xizang plateau were analyzed by using linear tendency estimation, T-test, correlation analysis and empirical orthogonal function decomposition. The results obtained were as follows. Soil temperature is affected by topography and altitude, the average soil temperature in the plateau area being lower than that in its surrounding areas, and lower in the north than in the south. In the northwest of the plateau, from the Kunlun Mountains to Ali prefecture, there are -10℃ cold centers, and in the Qaidam basin, which is in the northeastern part of the plateau, there exist 5℃ warm centers. Soil temperature spatial distribution is similar to the average soil temperature in spring and autumn, and is highest in summer and lowest in winter. EOF analysis of the first mode of soil temperature shows an obvious uniform temperature increasing type in the whole region. The four layers of soil temperature rise year by year and their variation is very similar. The trend was almost linear warming before 2005, and after 2005 the warming trend continued, but with fluctuation. The spatial distribution of the trend coefficients shows that soil temperature of all the 4 layers are increasing and their spatial distribution is similar, the warming trend in the plateau area is stronger than that in the surrounding areas, and is stronger in the western part of the plateau than in the east part. As the depth increases, the warming trend decreases. The main spatial distribution characteristics of soil temperature are explained by the 0-10 cm soil layer as the representative layer:soil temperature increases at a rate of 0.1 to 0.3℃/10a in most areas of the plateau, and the largest warming center is in the northern part of Ali prefecture, with an increasing rate of 0.67℃/10a. Spring has the strongest warming, followed in sequence by autumn and summer, and winter.
Key words:  Qinghai-Xizang plateau  soil temperature  GLDAS
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