Use of the 1991 ASCOT field study data in a mesoscale model employing a four-dimensional data assimilation technique

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In this study, a four-dimensional data assimilation technique based on Newtonian relaxation is incorporated into Colorado State University (CSU) Regional Atmospheric Modeling System (RAMS) and evaluated using data taken from one experiment of the US Department of Energy's (DOE) 1991 Atmospheric Studies in COmplex Terrain (ASCOT) field study along the front range of the Rockies in Colorado. The main objective of this study is to determine the ability of the model to predict small-scale circulations influenced by terrain, such as drainage flows, and assess the impact of data assimilation on the numerical results. In contrast to previous studies in which ... continued below

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15 pages

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Fast, J.D. & O'Steen, B.L. January 1, 1992.

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In this study, a four-dimensional data assimilation technique based on Newtonian relaxation is incorporated into Colorado State University (CSU) Regional Atmospheric Modeling System (RAMS) and evaluated using data taken from one experiment of the US Department of Energy's (DOE) 1991 Atmospheric Studies in COmplex Terrain (ASCOT) field study along the front range of the Rockies in Colorado. The main objective of this study is to determine the ability of the model to predict small-scale circulations influenced by terrain, such as drainage flows, and assess the impact of data assimilation on the numerical results. In contrast to previous studies in which the smallest horizontal grid spacing was 10 km (Stauffer and Seaman, 1991) and 8 km (Yamada and Hermi, 1991), data assimilation is applied in this study to domains with a horizontal grid spacing as small as 1 km. The prognostic forecasts made by RAMS are evaluated by comparing simulations that employ static initial conditions, with simulations that incorporate continuous data assimilation and data assimilation for fixed period of time (dynamic initialization). This paper will also elaborate on the application and limitation of the Newtonian relaxation technique in limited-area mesoscale models with a relatively small grid spacing.

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15 pages

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OSTI; NTIS; GPO Dep.

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  • 6. American Meteorological Society conference on mountain meteorology, Portland, OR (United States), 29 Sep - 2 Oct 1992

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  • Other: DE93002683
  • Report No.: WSRC-MS-92-161
  • Report No.: CONF-9209163--5
  • Grant Number: AC09-89SR18035
  • Office of Scientific & Technical Information Report Number: 7018857
  • Archival Resource Key: ark:/67531/metadc1181570

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  • January 1, 1992

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  • July 2, 2018, 10:52 p.m.

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  • May 2, 2019, 4:07 p.m.

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Fast, J.D. & O'Steen, B.L. Use of the 1991 ASCOT field study data in a mesoscale model employing a four-dimensional data assimilation technique, article, January 1, 1992; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1181570/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.