CLM5.0对青藏高原冻融过程土壤温湿度的模拟及评估  

Simulation and Evaluation of Soil Temperature and Moisture during Freeze-thaw Process in Xizang Plateau by CLM5.0

作　　者：张哲浩 赖欣 张戈 姚思源 张粟瑜 ZHANG Zhehao;LAI Xin;ZHANG Ge;YAO Siyuan;ZHANG Suyu(School of Atmospheric Sciences,Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Joint Laboratory of Climate and Environment Change,Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province,Chengdu 610225,Sichuan,China)

机构地区：[1]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/成都平原城市气象与环境四川省野外科学观测研究站,四川成都610225

出　　处：《高原气象》2025年第1期32-45,共14页Plateau Meteorology

基　　金：国家自然科学基金项目(42075081);四川省自然科学基金青年项目(2023NSFSC0748);成都信息工程大学科技创新能力提升计划项目(KYQN202319)。

摘　　要：利用1979-2018年中国区域地面气象要素驱动数据集(0.1°×0.1°)作为大气强迫资料,驱动CLM5.0(Community Land Model version 5.0)模拟了青藏高原地区1979-2018年的土壤温湿度变化。将土壤冻融过程划分为冻结期和非冻结期,通过两个阶段的CLM5.0模拟与站点观测资料、同化资料(GLDAS-Noah)、卫星遥感资料(MODIS土壤温度资料和ESA CCI-COMBINED土壤湿度资料)的对比验证,探讨CLM5.0模拟土壤温湿度在青藏高原的适用性。结果表明:(1)CLM5.0可较准确地描述站点土壤温湿度的动态变化,CLM5.0模拟的土壤温湿度与观测资料具有一致的变化特征且数值上较为接近。CLM5.0模拟的准确性高于GLDAS-Noah。CLM5.0对站点土壤温度的描述更为准确。(2)CLM5.0能够较准确地描述高原冻融过程中的土壤温湿度特征,CLM5.0模拟土壤温湿度与MODIS和ESA CCICOMBINED遥感资料在高原总体呈显著正相关,相关系数大多在0.9以上。CLM5.0对土壤温度的模拟能力相对较好,对非冻结期土壤湿度的模拟能力优于冻结期。CLM5.0整体高估了土壤温度,平均偏差大多在0~4℃之间。土壤湿度的平均偏差大多在-0.1~0.1 m^(3)·m^(-3)之间,非冻结期的平均偏差相对较小。(3)CLM5.0模拟、GLDAS-Noah、MODIS和ESA CCI-COMBINED遥感资料的土壤温湿度均具有相似的空间分布,其中土壤温度空间分布特征相似度更高。CLM5.0具有较高的空间分辨率和更为精细的土壤分层,对土壤温湿度细节的刻画更为完善。(4)CLM5.0模拟资料在高原整体呈增温变干趋势,MODIS和ESA CCI-COMBINED遥感资料整体呈增温增湿趋势。CLM5.0模拟的土壤温度变化趋势相对准确,土壤湿度的变化趋势则存在较大偏差。The China Meteorological Forcing Dataset(0.1°×0.1°)from 1979-2018 was used as atmospheric forcing data to drive CLM5.0(Community Land Model version 5.0)to simulate soil temperature and moisture changes in the Qinghai-Xizang Plateau region from 1979 to 2018.Divide the soil freeze-thaw process into two stages:freezing period and thawing period.By comparing and validating CLM5.0 simulation with site observation data,assimilation data(GLDAS-Noah),and satellite remote sensing data(MODIS soil temperature data and ESA CCI-COMBINED soil moisture data)in two stages,this study explores the applicability of CLM5.0 simulation of soil temperature and moisture in the Qinghai-Xizang Plateau.The results indicate that:(1)CLM5.0 can accurately describe the dynamic changes in soil temperature and moisture at stations on the Qinghai-Xizang Plateau.The soil temperature and moisture simulated by CLM5.0 have consistent variation characteristics with the observed data and are numerically close.The accuracy of CLM5.0 simulation is higher than that of GLDAS Noah.CLM5.0 provides a more accurate description of soil temperature at the stations.(2)CLM5.0 can accurately describe the soil temperature and moisture characteristics during the freeze-thaw process in the Qinghai-Xizang Plateau.CLM5.0 simulated soil temperature and moisture show a significant positive correlation with MODIS and ESA CCI-COMBINED remote sensing data on the Qinghai-Xizang Plateau,with correlation coefficients mostly above 0.9.CLM5.0 has relatively better simulation ability for soil temperature in Qinghai-Xizang Plateau areas.CLM5.0 has better simulation ability for soil moisture during thawing periods than during freezing periods.CLM5.0 overestimates the soil temperature of the Qinghai-Xizang Plateau as a whole,with an average deviation mostly between 0~4℃.The average deviation of soil moisture simulated by CLM5.0 is mostly between-0.1~0.1 m^(3)·m^(-3),and the average deviation of soil moisture during thawing period is relatively small.(3)The soil temperature and

关 键 词：青藏高原 CLM5.0模拟 冻融过程 土壤温湿度 

分 类 号：P423.3[天文地球—大气科学及气象学]