DOI: 10.1002/2013JD020657
论文题名: Development and evaluation of a mosaic approach in the WRF-Noah framework
作者: Li D. ; Bou-Zeid E. ; Barlage M. ; Chen F. ; Smith J.A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 21 起始页码: 11918
结束页码: 11935
语种: 英语
英文关键词: mosaic
; Noah
; surface heterogeneity
; urban
; WRF
Scopus关键词: Atmospheric temperature
; Boundary layers
; Rain
; Surface properties
; Weather forecasting
; mosaic
; Noah
; Surface heterogeneities
; urban
; WRF
; Heat flux
; air temperature
; energy balance
; heterogeneity
; land cover
; land surface
; MODIS
; sensible heat flux
; surface temperature
英文摘要: The current Weather Research and Forecasting (WRF)-Noah modeling framework considers only the dominant land cover type within each grid cell, which here is referred to as the "dominant" approach. In order to assess the impact of subgrid-scale variability in land cover composition, a mosaic/tiling approach (hereafter the "mosaic" approach) is implemented into the coupled WRF-Noah modeling system. In the mosaic approach, a certain number (N) of tiles, each representing a land cover category, is considered within each grid cell. WRF simulations of a clear sky day and a rainfall period over a heterogeneous urban/suburban setting show that the two approaches generate differences in the surface energy balance, land surface temperature, near-surface states, boundary layer growth, as well as rainfall distribution. Evaluation against a variety of observational data (including surface flux measurements, the MODIS land surface temperature product, and radar rainfall estimates) indicates that, compared to the dominant approach, the mosaic approach has a better performance. In addition, WRF-simulated results with the mosaic approach are less sensitive to the spatial resolution of the grid: Larger differences are observed in simulations of different resolutions with the dominant approach. The effect of increasing the number of tiles (N) on the WRF-simulated results is also examined. When N increases from 1 (i.e., the dominant approach) to 15, changes in the ground heat flux, sensible heat flux, surface temperature, and 2 m air temperature are more significant during nighttime. Changes in the 2 m specific humidity are more significant during daytime, and changes in the boundary layer height are most prominent during the morning and afternoon transitional periods. Key Points Subgrid-scale land use/land cover heterogeneity is important A mosaic approach is developed in WRF-Noah The mosaic approach performs better than the default dominant approach ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63184
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08540, United States; Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Li D.,Bou-Zeid E.,Barlage M.,et al. Development and evaluation of a mosaic approach in the WRF-Noah framework[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(21)