Improved wind and precipitation forecasts over South China using a modified orographic drag parameterization scheme
Improved wind and precipitation forecasts over South China using a modified orographic drag parameterization scheme
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DOI：
10.1007/s13351-014-4934-1
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发表时间：
2015-02
影响因子：
3.2
通讯作者：
Shui‐xin Zhong;Zitong Chen
中科院分区：
文献类型：
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作者：
Shui‐xin Zhong;Zitong Chen
为改进华南地区风场和降水预报，在GRAPES_TMM热带中尺度模式中采用了一种同时考虑重力波阻力（GWD）和山地阻塞阻力（MBD）影响的地形阻力参数化（OP）方案。模拟从2013年6月19日1200 UTC开始进行了一个月。初始和侧边界条件由NCEP全球预报系统输出。模拟结果进行了比较之间的控制（CTL）实验没有OP计划，GWDO实验与OP计划，只考虑GWD的效果，和MBD实验与修改后的OP计划（包括GWD和MBD）。改进的OP方案模拟成功地捕捉到了降水的主要特征，包括降水的分布和强度，改善了对流层低层风场的预报。改进的OP方案通过加速上升气流运动和加强降水区的辐合，改善了风场预报。总体而言，改进后的OP方案对华南地区大尺度大气场的预报有积极的影响。
To improve the wind and precipitation forecasts over South China, a modified orographic drag parameterization (OP) scheme that considers both the gravity wave drag (GWD) and the mountain blocking drag (MBD) effects was implemented in the Global/Regional Assimilation and Prediction System Tropical Mesoscale Model (GRAPES_TMM). Simulations were performed over one month starting from 1200 UTC 19 June 2013. The initial and lateral boundary conditions were obtained from the NCEP global forecast system output. The simulation results were compared among a control (CTL) experiment without the OP scheme, a GWDO experiment with the OP scheme that considers only the GWD effect, and an MBD experiment with the modified OP scheme (including both GWD and MBD). The simulation with the modified OP scheme successfully captured the main features of precipitation, including its distribution and intensity, and improved the wind circulation forecast in the lower troposphere. The modified OP scheme appears to improve the wind forecast by accelerating the ascending air motion and reinforcing the convergence in the rainfall area. Overall, the modified OP scheme exerts positive impacts on the forecast of large-scale atmospheric fields in South China.