TITLE

Impact of Moisture Flux and Freezing Level on Simulated Orographic Precipitation Errors over the Pacific Northwest

AUTHOR(S)
Lin, Yanluan; Colle, Brian A.; Yuter, Sandra E.
PUB. DATE
February 2013
SOURCE
Journal of Hydrometeorology;Feb2013, Vol. 14 Issue 1, p140
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Two cool seasons (November-March) of daily simulations using the fifth-generation Pennsylvania State University-NCAR Mesoscale Model (MM5) over the Pacific Northwest are used to investigate orographic precipitation bias. Model simulations are compared with data from a radiosonde site at Salem, Oregon, just upstream (west) of the Oregon Cascades; precipitation gauges over a portion of the Pacific Northwest; and a National Weather Service Weather Surveillance Radar-1988 Doppler (WSR-88D) in Portland, Oregon. The 77 storms analyzed are partitioned into warm/cold storms based on the freezing level above/below the Oregon Cascades crest (~1600 m MSL). Although the seasonal precipitation is well simulated, the model has a tendency to overpredict surface precipitation for cold storms. The correlation between the upstream relative humidity-weighted integrated moisture transport and precipitation for warm storms ( r2 = 0.81) is higher than that for cold storms ( r2 = 0.54). Comparisons of model ice water content (IWC) and derived reflectivity with radar-retrieved IWC and observed reflectivity for the 38 well-simulated storms show reasonably good agreement for warm storms but an overprediction of IWC and reflectivity aloft for cold storms. One plausible reason for the persistent overprediction of IWC in cold storms might be related to the positive bias in snow depositional growth formulation in the model bulk microphysics parameterization. A favorable overlap of the maximum snow depositional growth region with the mountain wave ascent region in cold storms magnifies the bias and likely contributes to the precipitation overprediction. This study also highlights the benefit of using data aloft from an operational radar to complement surface precipitation gauges for model precipitation evaluation over mountainous terrain.
ACCESSION #
85652900

 

Related Articles

  • Benefit of convection permitting climate model simulations in the representation of convective precipitation. Fosser, G.; Khodayar, S.; Berg, P. // Climate Dynamics;Jan2015, Vol. 44 Issue 1/2, p45 

    A major source of uncertainty in regional climate model (RCM) simulations arises from the parameterisation of sub-grid scale convection. With increasing model resolution, approaching the so-called convection permitting scale, it is possible to switch off most of the convection parameterisations....

  • Simulation of Monsoon Precipitation over South-Asia Using RegCM3. Basit, Abdul; Raza, S. Shoaib; Irfan, N.; Avila, R. // ISRN Meteorology;2012, p1 

    The objective of this study is to explore the capability of the Regional Climate Model (RegCM3), to predict the extreme weather events in south-Asian region with particular reference to precipitation during monsoon season (July, August and September) over northern mountainous and southern plain...

  • Validation of precipitation over Japan during 1985-2004 simulated by three regional climate models and two multi-model ensemble means. Ishizaki, Yasuhiro; Nakaegawa, Toshiyuki; Takayabu, Izuru // Climate Dynamics;Jul2012, Vol. 39 Issue 1/2, p185 

    We dynamically downscaled Japanese reanalysis data (JRA-25) for 60 regions of Japan using three regional climate models (RCMs): the Non-Hydrostatic Regional Climate Model (NHRCM), modified RAMS version 4.3 (NRAMS), and modified Weather Research and Forecasting model (TWRF). We validated their...

  • Regional, Very Heavy Daily Precipitation in NARCCAP Simulations. KAWAZOE, SHO; GUTOWSKI JR., WILLIAM J. // Journal of Hydrometeorology;Aug2013, Vol. 14 Issue 4, p1212 

    The authors analyze the ability of the North American Regional Climate Change Assessment Program's ensemble of climate models to simulate very heavy daily precipitation and its supporting processes, com-paring simulations that used observation-based boundary conditions with observations. The...

  • Regional, Very Heavy Daily Precipitation in CMIP5 Simulations. KAWAZOE, SHO; GUTOWSKI JR., WILLIAM J. // Journal of Hydrometeorology;Aug2013, Vol. 14 Issue 4, p1228 

    The authors analyze the ability of global climate models (GCMs) from phase 5 of the Coupled Model Intercomparison Project (CMIP5) multimodel ensemble to simulate very heavy daily precipitation and its supporting processes, comparing them with observations. Their analysis focuses on an upper...

  • Exploring a Global Multiresolution Modeling Approach Using Aquaplanet Simulations*. Rauscher, Sara A.; Ringler, Todd D.; Skamarock, William C.; Mirin, Arthur A. // Journal of Climate;Apr2013, Vol. 26 Issue 8, p2432 

    Results from aquaplanet experiments performed using the Model for Prediction across Scales (MPAS) hydrostatic dynamical core implemented within the Department of Energy (DOE)-NCAR Community Atmosphere Model (CAM) are presented. MPAS is an unstructured-grid approach to climate system modeling...

  • The Temporal Variability of Soil Moisture and Surface Hydrological Quantities in a Climate Model. Arora, Vivek K.; Boer, George J. // Journal of Climate;Nov2006, Vol. 19 Issue 22, p5875 

    The variance budget of land surface hydrological quantities is analyzed in the second Atmospheric Model Intercomparison Project (AMIP2) simulation made with the Canadian Centre for Climate Modelling and Analysis (CCCma) third-generation general circulation model (AGCM3). The land surface...

  • Evaluation of WRF and HadRM Mesoscale Climate Simulations over the U.S. Pacific Northwest. Zhang, Yongxin; Dulière, Valérie; Mote, Philip W.; Salathé Jr., Eric P. // Journal of Climate;Oct2009, Vol. 22 Issue 20, p5511 

    This work compares the Weather Research and Forecasting (WRF) and Hadley Centre Regional Model (HadRM) simulations with the observed daily maximum and minimum temperature (Tmax and Tmin) and precipitation at Historical Climatology Network (HCN) stations over the U.S. Pacific Northwest for...

  • The Performance of Different Boundary-Layer Parameterisations in Meteorological Modelling in a Southwestern Coastal Area of the Iberian Peninsula. Hernández-Ceballos, M. A.; Adame, J. A.; Bolivar, J. P.; De la Morena, B. A. // ISRN Meteorology;2012, p1 

    The performance of four atmospheric boundary layer (ABL) schemes in reproducing the diurnal cycles of surface meteorological parameters as well as the ABL structure and depth over a coastal area of southwestern Iberia was assessed using the mesoscale meteorological Weather Research and...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics