基于WRF模拟祁连山地表反照率变化对气候效应的研究  

Study on the Climate Effect of Surface Albedo Change in Qilian Mountains Based onWRF

作　　者：张雨婷 庞国锦 李继春 Zhang Yuting;Pang Guojing;Li Jichun(Faculty of Geomatics,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China;Gansu Engineering Laboratory for National Geographic State Monitoring,Lanzhou 730070,Gansu,China;Gansu Forestry Voctech University,Tianshui 741020,Gansu,China)

机构地区：[1]兰州交通大学测绘与地理信息学院,甘肃兰州730070 [2]甘肃省地理国情监测工程实验室,甘肃兰州730070 [3]甘肃林业职业技术学院,甘肃天水741020

出　　处：《农业技术与装备》2024年第12期118-121,共4页Agricultural Technology & Equipment

基　　金：国家自然科学基金项目(42161025)。

摘　　要：地表反照率是对陆面辐射能收支影响最大的一个参数,是陆面过程中一个重要的物理量,其变化直接影响地表能量的收支状况,进而可以影响气温和降水等其他气象要素。研究运用WRF模式,应用MODIS地表反照率产品替代原模式低时空分辨率的地表反照率,通过两组数值模拟试验分别探讨了地表反照率改变对祁连山地区气温以及感热通量和潜热通量的影响,详细分析了地表反照率改变对气温变化的影响机制。结果表明:WRF默认的反照率产品存在较高的高估,尤其是在积雪覆盖地区;通过替换卫星遥感产品后WRF模式在月尺度上能够更准确地模拟气温的变化过程,明显改善模式模拟的冷偏差;当地表反照率减少(增加)时,感热和潜热是增加(减少)的,其中感热通量的变化要大于潜热通量的变化。Surface albedo is a parameter that has the greatest impact on the balance of land surface radiative energy.It is an important physical quantity in land surface process.Its change directly affects the balance of land surface energy,and then can affect other meteorological elements such as temperature and precipitation.In this study,the WRF model was used to replace the low spatial-temporal resolution of the original model with MODIS surface albedo products.Two sets of numerical simulation experiments were conducted to investigate the effects of surface albedo change on temperature,sensible heat flux and latent heat flux in Qilian Mountains,and the influence mechanism of surface albedo change on temperature change was analyzed in detail.The results showed that the default albedo products of WRF had a high overestimation,especially in snow-covered areas.After replacing the satellite remote sensing products,the WRF model can more accurately simulate the temperature change process on a monthly scale,and obviously improve the cold bias of the model simulation.When the surface albedo decreases(increases),sensible heat and latent heat increase(decrease),and the change of sensible heat flux is greater than that of latent heat flux.

关 键 词：地表反照率 WRF模式 卫星遥感资料同化 祁连山 

分 类 号：X87[环境科学与工程—环境工程] P422[天文地球—大气科学及气象学]