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Analysis of diurnal boundary layer development in boreal forests: measurements and simulations

Journal of Plant Ecology 2012年第2期5卷 191-205页

作者： Jiarui Dong wenge ni-meister NOAA/NCEP/EMC and IMSG 5200 Auth RoadCamp Springs20746 MDUSA Department of Geography Hunter CollegeThe City University of New York695 Park AvenueNew York10065 NYUSA

Aims Combining field data analysis and modeling,this study investigates factors influencing the diurnal boundary layer(BL)development in boreal *** Field data analysis used both air sounding and surface flux measurements collected during the Boreal Ecosystem–Atmosphere Study field campaigns in central *** study applied a non-local transilient turbulence theory(TTT)to simulate the impact of the heterogeneous boundary conditions together with initial conditions on the BL development at the Candle Lake and Thompson release sites over boreal *** conditions were characterized by the integrated surface flux measurements from different forest *** lake effect was included in constructing the surface fluxes at Candle Lake release *** Findings Analyses of serial upper air sounding data and tower flux data indicate strong linear impacts of surface sensible heat forcing on the diurnal BL development above boreal *** regression slopes on the relationship between the BL development and the surface fluxes reflect the influences of initial boundary conditions to the BL *** the modeled and the measured diurnal BLs show that lakes reduce sensible heat flux,leading to a shallower boundary in Candle Lake than in *** of the model results and field measurements on the BL profiles indicates that the TTT model has the capability to simulate the BL development above boreal forests for sunny,rainfall or cloudy *** study demonstrates the importance of lake on surface fluxes and BL *** modeling effort shows the potential to couple the transilient theory with a land surface process model to study land surface and atmosphere interaction in boreal forest.

关键词： BOREAS transilient turbulence theory lake effects initial patterns surface fluxes

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Assessing the impacts of vegetation heterogeneity on energy fluxes and snowmelt in boreal forests

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Journal of Plant Ecology 2011年第1期4卷 37-47页

作者： wenge ni-meister Huilin Gao Department of Geography Hunter College of The City University of New York695 Park AvenueNew YorkNY 10065USA Department of Civil and Environmental Engineering University of WashingtonSeattleWA 98195USA

Aims In the mid-and high-latitude regions,three quarters of the land surface is covered by boreal conifer forests,and snow lasts for 6–8 months of the *** modeling surface energy balance and snowmelt at mid-and high-latitudes has a significant influence on climate and hydrological ***,the heterogeneous and clumped forest structure exerts important control over the radiative energy at the forest floor,which results in large variations of underneath snow cover and snowmelt *** goal of this study is to investigate the impact of hierarchically clumped vegetation structure in boreal forest on snowmelt and exchanges of energy and *** We used a simple Clumped Canopy Scheme(CCS)for canopy radiation transfer to characterize the impact of the clumped forest structure on net radiation at the snow surface underneath *** CCS was integrated with the Variable Infiltration Capacity macroscale hydrological model(herein referred to as VIC-CCS)to characterize the impact of clumped vegetation structure on surface energy balance and snowmelt during the snow season.A twin simulation,VICCCS and the standard VIC model,was performed to isolate the impact of CCS on the energy and water fluxes and snowmelt *** simulation results were compared to in situ measurements at four different forest stands:old aspen forest in the Southern Study Area(SOA),black spruce forests in the Southern and Northern Study Areas(SOBS and NOBS)and fen wetland in the Northern Study Area(NFEN)within the Boreal Ecosystem–Atmosphere Study(BOREAS)region in central Canada during 1994 *** Findings Simulations showed that the implementation of CCS has reduced incoming long-wave radiation at the underlying snow surface and,thereby,lowered the snowmelt *** against ground observations of net radiation and surface flux rates showed a reasonable agreement while demonstrating implementation of CCS can markedly improve model surface energy budget and en

关键词： clumping snowmelt VIC boreal forests

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