Episodic modeling of the chemical structure of the troposphere as revealed during the spring MLOPEX 2 intensive
| Autor: | Jean-Francois Lamarque, Sasha Madronich, Mary C. Barth, Peter Hess, S. J. Flocke |
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| Rok vydání: | 2000 |
| Předmět: |
Atmospheric Science
Ecology Chemical transport model Planetary boundary layer Cloud cover Mesoscale meteorology Paleontology Soil Science Forestry Aquatic Science Oceanography Troposphere Geophysics Space and Planetary Science Geochemistry and Petrology Observatory Atmospheric chemistry Climatology Earth and Planetary Sciences (miscellaneous) International Satellite Cloud Climatology Project Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research: Atmospheres. 105:26809-26839 |
| ISSN: | 0148-0227 |
| Popis: | An episodic regional chemical transport model (CTM) is described and applied to modeling the vertical chemical structure of the troposphere, as revealed from aircraft flights in the vicinity of Hawaii during the springtime Mauna Loa Observatory Photochemistry Experiment 2c intensive. The CTM simulates the chemistry and transport of 50 species within the North Pacific basin. It is driven by output fields from the Pennsylvania State University/National Center for Atmospheric Research Mesoscale Modeling System. The modeled meteorology is highly correlated with European Centre for Medium-Range Weather Forecasts analyses on the large scale but is not accurate enough to correctly simulate the long-range transport of chemical plumes. The simulated total cloud cover is ap- proximately correct when compared with International Satellite Cloud Climatology Project cloud cover. However, the coverage of low-lying clouds is overpredicted, while the upper level cloudiness is underpredicted. Modeled and satellite-derived deep convection are reasonably correlated. The measured concentrations of H.O, CH3OOH, CO, NOv, and 03 are compared with simulated concentrtions from the marine boundary layer to approximately 9 krn. Although pronounced chem- ical plumes and vertical layering complicate the model-measurement comparison, modeled and measured concentrations are generally within a fact, or of 2. with particularly well simulated. A number of measured transient chemical events are examined. This study provides the necessary background for' subse(ltCnt papers examining the chemistry and transport of the Pacific basin in more detail. |
| Databáze: | OpenAIRE |
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