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Global simulation of tropospheric ozone using the University of Maryland Chemical Transport Model (UMD‐CTM): 2. Regional transport and chemistry over the central United States using a stretched grid

Journal Article · · Journal of Geophysical Research
 [1];  [2];  [2];  [3];  [4]
  1. Department of Meteorology University of Maryland College Park Maryland USA; University of Maryland, College Park, MD
  2. Department of Meteorology University of Maryland College Park Maryland USA
  3. Department of Environmental Sciences Rutgers University New Brunswick New Jersey USA
  4. Earth System Science Interdisciplinary Center University of Maryland College Park Maryland USA
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We use the stretched-grid version of the three-dimensional global University of Maryland Chemical Transport Model (UMD-CTM) to examine the effects of mesoscale meteorological features such as fronts and deep convection on regional-scale chemistry and transport. The stretched-grid model simulation, with a grid configuration featuring a mesoscale resolution region centered over the central United States, was conducted for June 1985, and evaluated through comparisons with a set of aircraft observations of trace gases. We also present results from a uniform-grid UMD-CTM simulation with a more conventional 2 x 2.5 degree horizontal resolution for the same time period to examine how well the stretched-grid global model simulates mesoscale features. The changes in middle and upper tropospheric CO and O3 due to convection from the model simulations are in good agreement with the range of measurements. The stretched-grid model shows better agreement with measurements than the uniform-grid model for the enhancement of trace gases in upper troposphere outflow due to deep convection and for the gradient of trace gas mixing ratios across a cold front. Peak convective enhancement of CO in the upper troposphere is larger in the stretched-grid model simulation than in the uniform-grid simulation, indicating a better representation of locally focused deep convective transport of polluted boundary layer air in the former.

Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
FG02-01ER63197
OSTI ID:
953705
Report Number(s):
DOE-CCPP-JGR-Park-2004; 0007185
Journal Information:
Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: D9 Vol. 109; ISSN 0148-0227
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
97 MATHEMATICS AND COMPUTING
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