DOI: 10.1007/s00382-017-3889-1
Scopus记录号: 2-s2.0-85028989006
论文题名: Internal variability of a dynamically downscaled climate over North America
作者: Wang J. ; Bessac J. ; Kotamarthi R. ; Constantinescu E. ; Drewniak B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-11-12 起始页码: 4539
结束页码: 4559
语种: 英语
英文关键词: Climate change
; High spatial resolution
; Internal variability
; Regional climate model
; Spectral nudging
Scopus关键词: climate change
; climate modeling
; ensemble forecasting
; geographical distribution
; regional climate
; spatial resolution
; North America
英文摘要: This study investigates the internal variability (IV) of a regional climate model, and considers the impacts of horizontal resolution and spectral nudging on the IV. A 16-member simulation ensemble was conducted using the Weather Research Forecasting model for three model configurations. Ensemble members included simulations at spatial resolutions of 50 and 12 km without spectral nudging and simulations at a spatial resolution of 12 km with spectral nudging. All the simulations were generated over the same domain, which covered much of North America. The degree of IV was measured as the spread between the individual members of the ensemble during the integration period. The IV of the 12 km simulation with spectral nudging was also compared with a future climate change simulation projected by the same model configuration. The variables investigated focus on precipitation and near-surface air temperature. While the IVs show a clear annual cycle with larger values in summer and smaller values in winter, the seasonal IV is smaller for a 50-km spatial resolution than for a 12-km resolution when nudging is not applied. Applying a nudging technique to the 12-km simulation reduces the IV by a factor of two, and produces smaller IV than the simulation at 50 km without nudging. Applying a nudging technique also changes the geographic distributions of IV in all examined variables. The IV is much smaller than the inter-annual variability at seasonal scales for regionally averaged temperature and precipitation. The IV is also smaller than the projected changes in air-temperature for the mid- and late twenty-first century. However, the IV is larger than the projected changes in precipitation for the mid- and late twenty-first century. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109285
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Environmental Science Division, Argonne National Laboratory, Bldg. 240, Rm. 6109, 9700 South Cass Ave., Argonne, IL 60439, United States; Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, IL, United States
Recommended Citation:
Wang J.,Bessac J.,Kotamarthi R.,et al. Internal variability of a dynamically downscaled climate over North America[J]. Climate Dynamics,2018-01-01,50(2018-11-12)