DOI: 10.1016/j.atmosres.2018.09.004
Scopus记录号: 2-s2.0-85053798396
论文题名: Sensitivity of WRF simulations with the YSU PBL scheme to the lowest model level height for a sea fog event over the Yellow Sea
作者: Yang Y. ; Hu X.-M. ; Gao S. ; Wang Y.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2019
卷: 215 起始页码: 253
结束页码: 267
语种: 英语
英文关键词: Lowest model level height
; Sea fog
; Virtual potential temperature at z1
; WRF
; YSU PBL scheme
Scopus关键词: Air
; Atmospheric thermodynamics
; Boundary layers
; Specific heat
; Weather forecasting
; Lowest model level height
; Planetary boundary layers
; Potential temperature
; Sea fog
; Surface temperatures
; Weather research and forecasting models
; Yonsei university pbl schemes (YSU)
; YSU PBL scheme
; Fog
; advection
; boundary layer
; computer simulation
; experimental study
; fog
; heating
; marine atmosphere
; numerical model
; performance assessment
; sea surface temperature
; sensitivity analysis
; turbulent flow
; weather forecasting
; Pacific Ocean
; Yellow Sea
英文摘要: The lowest model level is the interface of energy and mass exchanging between the surface and planetary boundary layer (PBL). Previous studies mostly examined the role of the lowest model level height (z1) in simulating the continental PBL processes. The impact of z1 on simulating marine processes (e.g., sea fog), however, remains unclear. The present study explores the sensitivity of the Weather Research and Forecasting (WRF) model with the Yonsei University (YSU) PBL scheme to z1 for an advection fog event occurred on 27 March 2012 over the Yellow Sea. Seven experiments with various z1 (28, 22, 14, 8, 4, 1 and 0.4 m) are conducted. Evaluations for the continental PBL indicate that z1 below 8 m is irrational in simulating surface temperature and PBL height over land. However, the model with z1= 8 m gives the best performance in terms of reproducing sea fog. When z1 gets below 8 m, the sea fog occurs too early and the fog area is too small. As z1 exceeds 8 m, the fog forms too late and the fog area becomes underestimated. These model sensitivities can be explained by the impact of z1 on virtual potential temperature at z1 [θv(z1)]. Since the heat capacity of the air in the lowest model layer is proportional to z1, a lower (higher) z1 causes a quicker (slower) response of θv(z1) to surface cooling, thus leading to an earlier (later) sea fog formation. After the fog onset, especially for a lower z1, the variation of θv(z1) is dominated by turbulent heating that transports warmer air above to the very shallow lowest model layer, resulting in a lower vertical growth and even earlier dissipation of the sea fog. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109047
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: Key Laboratory of Physical Oceanography, College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, 266100, China; Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Center for Analysis and Prediction of Storms and School of Meteorology, University of Oklahoma, Norman, OK 73072, United States; School of Meteorology, University of Oklahoma, Norman, OK 73072, United States
Recommended Citation:
Yang Y.,Hu X.-M.,Gao S.,et al. Sensitivity of WRF simulations with the YSU PBL scheme to the lowest model level height for a sea fog event over the Yellow Sea[J]. Atmospheric Research,2019-01-01,215