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Comparison of 700-hPa NCEP-R1 and AMIP-R2 Wind Patterns over the Continental United States Using Cluster Analysis

Comparison of 700-hPa NCEP-R1 and AMIP-R2 Wind Patterns over the Continental United States Using... Clustering techniques are adapted to facilitate the comparison of gridded 700-hPa wind flow patterns spanning the continental United States. A recent decade (1985–94) of wind component data has been extracted from two widely used reanalysis datasets: NCEP-R1 and the NCEP–Department of Energy (DOE) Atmospheric Model Intercomparison Project, phase two (AMIP-R2). Metrics and measures are identified that facilitate the identification and comparison of large-scale wind flow. Comparison of the cluster results reveals dominant wind patterns common to both datasets as well as three types of reanalysis model differences: 1) relatively minor numerical differences; 2) differences produced by model corrections or parameterization changes, such as snow mask, snow depth, and moisture flux; and 3) systematic differences, such as orography, overocean radiation fluxes, and overocean data assimilation. A second analysis examines the frequency of 700-hPa wind patterns associated with key ozone-season (May–September) synoptic settings. Association of 1990–94 daily maximum 1-h ozone levels with these patterns across the United States follows documented meteorological dependencies. Above-average ozone levels in the Midwest and mid-Atlantic are associated with transitional anticyclone and easterly flow synoptic patterns (39.2% of ozone-season days) while above-average ozone levels across the southern United States are associated with the westward extension of the Bermuda high circulation (14.8% of ozone-season days). Below-average ozone levels throughout most of the eastern United States are associated with frontal passages and migratory anticyclones (29.6% of ozone-season days). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Meteorology and Climatology American Meteorological Society

Comparison of 700-hPa NCEP-R1 and AMIP-R2 Wind Patterns over the Continental United States Using Cluster Analysis

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Publisher
American Meteorological Society
Copyright
Copyright © 2006 American Meteorological Society
ISSN
1558-8432
DOI
10.1175/2007JAMC1527.1
Publisher site
See Article on Publisher Site

Abstract

Clustering techniques are adapted to facilitate the comparison of gridded 700-hPa wind flow patterns spanning the continental United States. A recent decade (1985–94) of wind component data has been extracted from two widely used reanalysis datasets: NCEP-R1 and the NCEP–Department of Energy (DOE) Atmospheric Model Intercomparison Project, phase two (AMIP-R2). Metrics and measures are identified that facilitate the identification and comparison of large-scale wind flow. Comparison of the cluster results reveals dominant wind patterns common to both datasets as well as three types of reanalysis model differences: 1) relatively minor numerical differences; 2) differences produced by model corrections or parameterization changes, such as snow mask, snow depth, and moisture flux; and 3) systematic differences, such as orography, overocean radiation fluxes, and overocean data assimilation. A second analysis examines the frequency of 700-hPa wind patterns associated with key ozone-season (May–September) synoptic settings. Association of 1990–94 daily maximum 1-h ozone levels with these patterns across the United States follows documented meteorological dependencies. Above-average ozone levels in the Midwest and mid-Atlantic are associated with transitional anticyclone and easterly flow synoptic patterns (39.2% of ozone-season days) while above-average ozone levels across the southern United States are associated with the westward extension of the Bermuda high circulation (14.8% of ozone-season days). Below-average ozone levels throughout most of the eastern United States are associated with frontal passages and migratory anticyclones (29.6% of ozone-season days).

Journal

Journal of Applied Meteorology and Climatology – American Meteorological Society

Published: Jul 5, 2006

References

  • Cluster Analysis for Applications.
    Anderberg
  • Observations and theory of weather systems.
    Bluestein
  • Review of the governing equations, computational algorithms, and other components of the Models-3 Community Multiscale Air Quality (CMAQ) modeling system.
    Byun
  • The effects of climate change on the hydrology and water resources of the Colorado River basin.
    Christensen
  • Development of an aggregation and episode selection scheme to support the Models-3 Community Multiscale Air Quality Model.
    Cohn
  • An upper-air synoptic climatology of the western United States.
    Davis
  • An automated classification scheme designed to better elucidate the dependence of ozone on meteorology.
    Eder
  • An operational evaluation of the Eta-CMAQ air quality forecast model.
    Eder
  • Fundamental mechanisms of the growth and decay of the PNA teleconnection pattern.
    Feldstein
  • Simulating changes in regional air pollution over the eastern United States due to changes in global and regional climate and emissions.
    Hogrefe
  • The NCEP/NCAR 40-Year Reanalysis Project.
    Kalnay
  • NCEP–DOE AMIP-II Reanalysis (R-2).
    Kanamitsu
  • The NCEP–NCAR 50-Year Reanalysis: Monthly means CD-ROM and documentation.
    Kistler
  • GCM simulations of the climate in the central United States.
    Kunkel
  • The Pacific/North American teleconnection pattern and United States climate. Part I: Regional temperature and precipitation associations.
    Leathers
  • Spatio-temporal characterization of tropospheric ozone across the eastern United States.
    Lehman
  • Warm season lightning distributions over the Florida Peninsula as related to synoptic patterns.
    Lericos
  • Potential regional climate change and implications to U.S. air quality.
    Leung
  • Mid-century ensemble regional climate change scenarios for the western United States.
    Leung
  • Regional climate model simulation of U.S. precipitation during 1982–2002. Part I: Annual cycle.
    Liang