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 on WRF
张雨婷 1庞国锦 1李继春2
作者信息
- 1. 兰州交通大学 测绘与地理信息学院,甘肃 兰州 730070;甘肃省地理国情监测工程实验室,甘肃 兰州 730070
- 2. 甘肃林业职业技术学院,甘肃 天水 741020
- 折叠
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.
Abstract
Surface albedo is a parameter that has the greatest impact on the balance of land surface radiative energy.It is an impor-tant 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-tem-poral resolution of the original model with MODIS surface albedo products.Two sets of numerical simulation experiments were con-ducted 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 de-fault albedo products of WRF had a high overestimation,especially in snow-covered areas.After replacing the satellite remote sens-ing products,the WRF model can more accurately simulate the temperature change process on a monthly scale,and obviously im-prove the cold bias of the model simulation.When the surface albedo decreases(increases),sensible heat and latent heat increase(de-crease),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Key words
surface albedo/WRF mode/satellite remote sensing data assimilation/Qilian Mountains引用本文复制引用
出版年
2024
NETL
NSTL
万方数据