Evaluation of the New Land-surface and Planetary Boundary Layer Parameterization Schemes in the NCEP Mesoscale Eta Model Using Oklahoma Mesonet Observations PDF Download
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Author: Curtis H. Marshall
Publisher:
ISBN:
Category : Automatic meteorological stations
Languages : en
Pages : 352
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Book Description
Author: Curtis H. Marshall
Publisher:
ISBN:
Category : Automatic meteorological stations
Languages : en
Pages : 352
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Book Description
Author:
Publisher:
ISBN:
Category : Meteorology
Languages : en
Pages : 1010
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Author:
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 670
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Author: Eve Gruntfest
Publisher: Springer Science & Business Media
ISBN: 9780792368250
Category : Medical
Languages : en
Pages : 344
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Proceedings of the NATO Advanced Study Institute, Ravello, Italy, 8-17 November 1999
Author:
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ISBN:
Category :
Languages : en
Pages :
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The specific purpose of the research is to evaluate the performance of the MM5 model in the forecasting of near-surface parameters, such as 2-meter temperature, 2-meter dew point, and 1000-850 mb thickness. The evaluation will include a comparison of the MM5 against the Eta model, and a comparison of the forecasting skill of the MM5 with three different land-surface parameterization schemes. Three different soil moisture scaling techniques will be applied to the MM5, and their forecasts will be evaluated against observations taken from 7-9 December 2001. The MM5 displayed an inability to capture the full magnitude of the diurnal cycle of 2-meter temperature and dew point. The Eta model performed better than the MM5 in the forecasts of near-surface parameters. The MM5 forecasts of near-surface parameters can be improved by adjusting the vertical profile of the soil moisture in the model initial conditions. By removing soil moisture from the initial conditions of the MM5, a more realistic Bowen ratio was simulated, leading to an improved forecast of the diurnal cycle of temperature and dew point. The results of this research suggest that the cause of the damped diurnal cycle in the MM5 forecasts may be inadequate ventilation of the upper planetary boundary layer, an inaccurate representation of surface evapotranspiration, or incorrect assignment of soil type and land use categories.
Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 924
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Mesoscale processes, dictated by surface characteristics, play adominant role in the development of the planetary boundary layer (PBL)structure and the formation of convection. The effect of mesoscale processeson the boundary layer structure also has significant implications in theunderstanding of circulation patterns and regional scale predictability. Largegeographical variability in North Carolina (NC) provides a wide variety ofweather events and climatological regimes. There are many challenges for numerical modeling in NC due to theheterogeneity in topography, land use, and soil type, presence of the oceanand the Gulf Stream. These heterogeneous attributes feature an excellentlocation for simulations and validation of the MM5 numerical modeling systemwith observations of high spatial and temporal resolution. MM5 is utilized for a non-precipitation case and a convective caseincluding precipitation with a 5-km domain centered over the Carolinas. Model integration is for 72 hours from 0000Z August 15, 2000 to 0000ZAugust 18, 2000. Simulated hourly surface and sub-surface values areevaluated against in-situ surface observations. These simulations consist ofreal case studies involving MM5 Version 3 with the MRF PBL schemecoupled to the Oregon State University (OSU) land surface model (LSM). The OSU LSM uses 1 km resolution land-use and soil data as input into MM5for capturing the dynamics of land-surface forcing. The acquisition and combination of different agro-meteorological dataacross NC provides high-resolution observations used for validation atmultiple model grid points. For the case studies, these data incorporate hourlyobservation sites throughout North Carolina including 19 ASOS (AutomatedSurface Observing Sites / owned and operated by the NWS and FAA) sitesand 15 ECONet (Environmental and Climate Observing Network: maintainedby State Climate Office of North Carolina) sites. Multiple parameterscompared and investigated using this network of observations include:E.
Author: E.F. Wood
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 334
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Book Description
Observations and observational needs. Insight from large-scale observational studies of land/atmosphere interactions. Some aspects of the HAPEX-MOBILHY programme: the data base and the modelling strategy. Passive microwave remote sensing contribution to hydrological variables. Modeling and observing land-surface-atmosphere interactions on large scales. Land surface hydrology in a general circulation model-global and regional fields needed for validation. Simulation of daily precipitation in the Pacific Northwest using a weather classification scheme. A refinement of the combination equations for evaporation. A statistical-dynamical approach to parameterize subgrid-scale land-surface heterogeneity in climate models. Evapotranspiration and runoff from large land surface hydrology for atmospheric general circulation models. Climate and the equilibrium state of land surface hydrology parameterizations. Partial analysis applied to scale problems in surface moisture fluxes. Distributed parameterization fo complex terrain. Modeling basin-scale hydrology in support of physical climate and global biogeochemical studies: an example using the Zambezi river.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721938643
Category :
Languages : en
Pages : 224
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Book Description
The objective of this investigation was to study the role of shallow convection on the regional water cycle of the Mississippi and Little Washita Basins using a 3-D mesoscale model, the PSUINCAR MM5. The underlying premise of the project was that current modeling of regional-scale climate and moisture cycles over the continents is deficient without adequate treatment of shallow convection. It was hypothesized that an improved treatment of the regional water cycle can be achieved by using a 3-D mesoscale numerical model having a detailed land-surface parameterization, an advanced boundary-layer parameterization, and a more complete shallow convection parameterization than are available in most current models. The methodology was based on the application in the MM5 of new or recently improved parameterizations covering these three physical processes. Therefore, the work plan focused on integrating, improving, and testing these parameterizations in the MM5 and applying them to study water-cycle processes over the Southern Great Plains (SGP): (1) the Parameterization for Land-Atmosphere-Cloud Exchange (PLACE) described by Wetzel and Boone; (2) the 1.5-order turbulent kinetic energy (TKE)-predicting scheme of Shafran et al.; and (3) the hybrid-closure sub-grid shallow convection parameterization of Deng. Each of these schemes has been tested extensively through this study and the latter two have been improved significantly to extend their capabilities. Stauffer, David R. and Seaman, Nelson L. and Munoz, Ricardo C. Goddard Space Flight Center NAG5-6398
Author: Jason Robert Cerjak
Publisher:
ISBN:
Category :
Languages : en
Pages : 113
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Book Description
Keywords: LSMs, PBLs, temperature forecasting, dew point forecasting, diurnal cycle forecasting, diurnal cycle, MM5, land-surface schemes, planetary boundary layer schemes.
