项目名称: 青藏高原土壤湿度及其对中国夏季降水的影响研究
项目编号: No.41505078
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 天文学、地球科学
项目作者: 赖欣
作者单位: 成都信息工程大学
项目金额: 21万元
中文摘要: 土壤湿度是水文学和气象气候学中的一个重要参量,青藏高原土壤湿度的变化及其对中国夏季降水的影响对于全球变化研究具有非常重要的意义。目前在青藏高原的土壤湿度模拟研究大多基于单站,模拟时间短,也较少有研究从整个高原、较长时间尺度上讨论土壤湿度的气候效应。本项目采用中国区域高时空分辨率地面气象要素驱动数据集为驱动场,驱动陆面过程模式CLM4.5得到一套较长时间序列(1981-2014年)的土壤湿度数据集。将生成的数据集分别与台站实测、再分析、卫星遥感反演等多种土壤湿度产品进行对比分析。并分析高原土壤湿度时空变化的气候学特征。利用中国气象局的观测降水资料,NCAR/NCEP的位势高度场等再分析资料,以及CLM4.5模拟得到土壤温度、感热、潜热等陆面资料,首先分析高原春季土壤湿度异常对地表热力状况的影响,然后分析土壤湿度异常对大气环流及夏季降水的影响。研究成果为短期气候预测、防灾减灾提供科学参考。
中文关键词: 青藏高原;数值模拟;土壤湿度;夏季降水;影响
英文摘要: Soil moisture(SM) is an important parameter of hydrology,meteorology and climatology. The variation of SM in the Tibetan Plateau(TP) and its influence on summer precipitation of China has very important significance in global change research. Simulation of SM in the TP are mostly based on a single station, and the simulation time period is short, can not meet the needs of the climate change research. Also there is less research to discuss climate influence of SM in the whole TP of long period. In this project, the high spatial and temporal resolution meteorological data sets of China is used to drive the Community Land Model version 4.5(CLM4.5) , get a long time series (1981-2014) SM data sets. The resulting SM data sets are compared with the measured, reanalysis, satellite remote sensing inversion SM products. Climatology character of temporal and spatial variation of SM is analysed. The measured precipitation of China Meteorological Administration, reanalysis as geopotential height of NCEP, soil temperature, sensible heat, latent heat from simulation of CLM4.5 will be used. First the influence of spring SM over the TP on surface thermal condition is researched,then the influence of spring SM over the TP on circulation and summer precipitation is researched. The results of the research provide scientific reference for climate forecast of short period,disaster prevention and reduction.
英文关键词: Tibetan Plateau;Numerical Simulation;Soil Moisture;Summer Precipitation;Influence