High-Resolution Simulations and Microphysical Validation of an Orographic Precipitation Event over the Wasatch Mountains during IPEX IOP3
- 1 October 2005
- journal article
- Published by American Meteorological Society in Monthly Weather Review
- Vol. 133 (10), 2947-2971
- https://doi.org/10.1175/mwr3017.1
Abstract
This paper investigates the kinematic flow and precipitation evolution of a winter storm over and upstream of the Wasatch Mountains [Intermountain Precipitation Experiment third intensive observing period (IPEX IOP3)] using a multiply nested version of the fifth-generation Pennsylvania State University (PSU)––National Center for Atmospheric Research (NCAR) Mesoscale Model (MM5). Validation using in situ aircraft data, radiosondes, ground-based radar, and surface observations showed that the MM5, which featured four domains with 36-, 12-, 4-, and 1.33-km grid spacing, realistically simulated the observed partial blocking of the 8–12 m s−1 ambient southwesterly flow and development of a convergence zone and enhanced lowland precipitation region upwind of the initial Wasatch slope. The MM5 also properly simulated the advance of this convergence zone toward the base of the Wasatch during the passage of a midlevel trough, despite not fully capturing the westerly wind shift accompanying the trough. Accurate simulation of the observed precipitation over the central Wasatch Mountains (within 25% of observed at all stations) required a horizontal grid spacing of 1.33 km. Despite close agreement with the observed surface precipitation, the Reisner2 bulk microphysical scheme produced too much supercooled cloud water and too little snow aloft. A model microphysical budget revealed that the Reisner2 generated over half of the surface precipitation through riming and accretion, rather than snow deposition and aggregation as implied by the observations. Using an intercept for the snow size distribution that allows for greater snow concentrations aloft improved the snow predictions and reduced the cloud water overprediction. Sensitivity studies illustrate that the reduced surface drag of the Great Salt Lake (GSL) enhanced the convergence zone and associated lowland precipitation enhancement upstream of the Wasatch Mountains. The presence of mountain ranges south of the Great Salt Lake appears to have weakened the along-barrier flow and windward convergence, resulting in a slight decrease in windward precipitation enhancement. Diabatic cooling from falling precipitation was also important for maintaining the blocked flow.Keywords
This publication has 51 references indexed in Scilit:
- The 13–14 December 2001 IMPROVE-2 Event. Part III: Simulated Microphysical Budgets and Sensitivity StudiesJournal of the Atmospheric Sciences, 2005
- Bulk Microphysical Sensitivities within the MM5 for Orographic Precipitation. Part I: The Sierra 1986 EventMonthly Weather Review, 2004
- Bulk Microphysical Sensitivities within the MM5 for Orographic Precipitation. Part II: Impact of Barrier Width and Freezing LevelMonthly Weather Review, 2004
- Sensitivity of Orographic Precipitation to Changing Ambient Conditions and Terrain Geometries: An Idealized Modeling PerspectiveJournal of the Atmospheric Sciences, 2004
- Numerical Simulations of a Landfalling Cold Front Observed during COAST: Rapid Evolution and Responsible Mechanisms*Monthly Weather Review, 2002
- The MAP Special Observing PeriodBulletin of the American Meteorological Society, 2001
- MM5 Precipitation Verification over the Pacific Northwest during the 1997–99 Cool Seasons*Weather and Forecasting, 2000
- Airspeed Corrections for Optical Array Probe Sample VolumesJournal of Atmospheric and Oceanic Technology, 1997
- Modelling precipitation in frontal rainbandsQuarterly Journal of the Royal Meteorological Society, 1988
- An Analysis of Cloud Drop Growth by Collection: Part IV. A New ParameterizationJournal of the Atmospheric Sciences, 1974