模式不同分辨率对新疆达坂城—小草湖风区地面风场模拟结果的分析  

Simulation of Surface Wind Using MM5 Model with Different Resolustions-A Case Study of Dabancheng and Xiaocaohu Wind Farms from April to September 2006

作　　者：辛渝[1] 汤剑平[2] 赵逸舟[1] 李元鹏[1] 王铁[1] 余行杰[1] 李兰[1] 

机构地区：[1]新疆气候中心,新疆乌鲁木齐830002 [2]南京大学大气科学系,江苏南京210093

出　　处：《高原气象》2010年第4期884-893,共10页Plateau Meteorology

基　　金：新疆维吾尔自治区气象局气象科技研究课题(YX200805/YX200808/200903);中国气象局行业专项项目(2008416048);新疆强天气发生机理及数值模式方法研究(idm200603)共同资助

摘　　要：使用非静力平衡中尺度MM5V3模式及NCEP/GFS 1°×1°再分析资料,对新疆达坂城-小草湖风区2006年4～9月10m高度的风况进行了3km×3km与1km×1km的模拟试验。结果表明:(1)3km与1km分辨率模拟的平均风速的大小分布特征整体一致,仅在复杂地形处以及风速大小值中心区域的强弱上存在细微差别,1km高分辨率对风速大小区域分布的模拟比3km分辨率更细致,且风速大、小值之间的变化梯度更明显。(2)3km与1km分辨率的模拟试验均较真实地反映了地形比较平坦、地貌比较单一区域的日平均风速与逐时平均风速的变化特征,但分辨率的提高并不能完全减小模拟误差。对于地形、地貌特征相对复杂区域而言,水平分辨率的提高,反而会加大模拟偏差。(3)两种分辨率的模拟误差在7、8月最大,4、9月份最小;对逐时平均风速的模拟误差均与距初始场时刻的长短无关。(4)两种分辨率对柴窝堡站点的模拟偏差过大,这很可能与模式中定义的水体、植被等参数与实际相距过大,以及该处地形陡峭,恰好位于绿洲与水体之间的荒漠过渡带有关。Based on the NCEP 1°×1° reanalysis data from April to September in 2006,experimental simulation of horizontal resolution 3 km and 1 km is carried out in Dabanchen-Xiaocaohu wind farms using the non-static equilibrium MM5V3 model.The simulated wind speed at 10 m level is compared with the observed,and the results show that： （1） The spatial distribution pattern of mean wind speed based on the 3 km×3 km resolutions is generally similar with 1 km except for the tiny distinction in the complex terrain area and the central areas with the strong or weak wind.That of 1 km resolution is not only more exquisitely depicted than that of 3 km,but also exists an apparent gradient variation characteristic between the strong and weak area in it.（2） The variation tendency of daily and hourly mean wind speeds can be described rather well in the flatter and simple geomorphologic landscape area,but the simulated error can not decline only by improving model resolution.For that of complex geomorphologic landscape area,the simulated error will increase with the higher resolution.（3） Simulated error of hourly mean wind speed has no relationship with the point-in-time of initial simulative field.（4） The simulated error of mean wind speed is bigger in July and August,smaller in April and September in two kinds of resolution.（5） At Chaiwopu,the bigger simulated error appears in the two resolutions.It is probably caused by the bigger discrepancy between the pre-defined physical parameters in MM5 model and the real,such as water body and vegetables,etc.On the other hand,it might be associating with its location that it sits at the steep and transitional zone between the oasis and water body.

关 键 词：达坂城风区 小草湖风区 风能资源数值模拟 模拟误差比较 

分 类 号：P413[天文地球—大气科学及气象学]