An evaluation of dynamical downscaling of Central Plains summer precipitation using a WRF-based regional climate model at a convection-permitting 4km resolution

被引:58
|
作者
Sun, Xuguang [1 ,2 ]
Xue, Ming [1 ,2 ]
Brotzge, Jerald [2 ,3 ]
McPherson, Renee A. [4 ]
Hu, Xiao-Ming [2 ]
Yang, Xiu-Qun [1 ]
机构
[1] Nanjing Univ, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China
[2] Univ Oklahoma, Ctr Anal & Predict Storms, Norman, OK 73019 USA
[3] SUNY Albany, New York State Mesonet, Albany, NY 12222 USA
[4] Univ Oklahoma, South Cent Climate Sci Ctr, Norman, OK 73019 USA
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
LOW-LEVEL JET; NUMERICAL WEATHER PREDICTION; SPECTRAL NUDGING TECHNIQUE; CONTINENTAL RADAR MOSAICS; CONTIGUOUS UNITED-STATES; GREAT-PLAINS; DIURNAL CYCLE; HORIZONTAL RESOLUTION; WARM-SEASON; EXTREME PRECIPITATION;
D O I
10.1002/2016JD024796
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
A significant challenge with dynamical downscaling of climate simulations is the ability to accurately represent convection and precipitation. The use of convection-permitting resolutions avoids cumulus parameterization, which is known to be a large source of uncertainty. A regional climate model ( RCM) based on the Weather Research and Forecasting model is configured with a 4 km grid spacing and applied to the U.S. Great Plains, a region characterized by many forms of weather and climate extremes. The 4 km RCM is evaluated by running it in a hindcast mode over the central U.S. region for a 10 year period, forced at the boundary by the 32 km North America Regional Reanalysis. The model is also run at a 25 kmgrid spacing, but with cumulus parameterization turned on for comparison. The 4 km run more successfully reproduces certain observed features of the Great Plains May-through-August precipitation. In particular, the magnitude of extreme precipitation and the diurnal cycle of precipitation over the Great Plains are better simulated. The 4 km run more realistically simulates the low-level jet and related atmospheric circulations that transport and redistribute moisture from Gulf of Mexico. The convection-permitting RCM may therefore produce better dynamical downscaling of future climate when nested within global model climate projections, especially for extreme precipitation magnitudes. The 4 km and 25 km simulations do share similar precipitation biases, including low biases over the central Great Plains and high biases over the Rockies. These biases appear linked to circulation biases in the simulations, but determining of the exact causes will require extensive, separate studies.
引用
收藏
页码:13801 / 13825
页数:25
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