DOI: 10.1002/2015MS000470
Scopus记录号: 2-s2.0-84945464868
论文题名: Evaluation of tropical channel refinement using MPAS-A aquaplanet simulations
作者: Martini M ; N ; , Gustafson W ; I ; , Jr ; , O'Brien T ; A ; , Ma P ; -L
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 3 起始页码: 1351
结束页码: 1367
语种: 英语
英文关键词: Balloons
; Climate models
; Precipitation (meteorology)
; Weather forecasting
; Aquaplanet
; Equatorial channel
; MPAS
; Variable resolution
; WRF
; Tropics
; atmospheric circulation
; climate modeling
; computer simulation
; model test
; precipitation intensity
; spatial resolution
; tropical environment
; weather forecasting
英文摘要: Climate models with variable-resolution grids offer a computationally less expensive way to provide more detailed information and increased accuracy by resolving processes that cannot be adequately represented by a coarser grid. This study uses the Model for Prediction Across Scales-Atmosphere (MPAS-A), consisting of a nonhydrostatic dynamical core and a subset of Weather Research and Forecasting (WRF) model physics, to investigate the potential benefits of using tropical channel refinement. The simulations are performed with an idealized aquaplanet configuration using 30 and 240 km global grid spacing, and two variable-resolution grids spanning the same grid spacing range; one with a narrow (20S-20N) and one with a wide (30S-30N) tropical channel refinement. Increasing resolution in the tropics impacts both the tropical and extratropical circulation. Compared to the 30 km global grid, both refined channel simulations exhibit slightly stronger updrafts inside the Hadley cell resulting in more resolved precipitation. Using a wider tropical refinement leads to a closer correspondence with the global high-resolution grid. While different grid spacings produce similar cloud size distributions that are consistent with observations, the dependence of precipitation rate on cloud size varies among simulations. The refined channel simulations show improved tropical and extratropical precipitation relative to the global coarse simulation. All simulations show a single precipitation peak centered on the equator. Although the results show that tropical refinement is an effective method for avoiding artifacts due to grid resolution sensitivities seen in earlier studies that only refined a portion of the tropics, some biases remain well inside of the refinement region. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75979
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Atmospheric Sciences, Global Change Division Pacific, Northwest National Laboratory, Richland, WA, United States; Now at Naval Research Laboratory, Monterey, CA, United States; Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Recommended Citation:
Martini M,N,, Gustafson W,et al. Evaluation of tropical channel refinement using MPAS-A aquaplanet simulations[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(3)