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Record 46 of 405
The Sensitivity of Model Ozone to Advective and Photochemical Processes in the High Latitude Winter Lower Stratosphere
Author and Affiliation:
Douglass, A.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Kawa, S. R.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Einaudi, Franco [Technical Monitor]
Abstract: Three dimensional chemistry and transport models (CTMs) contain a set of coupled continuity equations which describe the evolution of constituents such as ozone and other minor species which affect ozone. Both advection and photochemical processes contribute to constituent evolution, and a CTM provides a means to evaluate these contributions separately. Such evaluation is particularly useful when both terms are important to the modeled tendency. An example is the ozone tendency in the high latitude winter lower stratosphere, where advection tends to increase ozone, and catalytic processes involving chlorine radicals tend to decrease ozone. The Goddard three dimensional chemistry and transport model uses meteorological fields from the Goddard Earth Observing System Data Assimilation System, thus the modeled ozone evolution may reproduce the observed evolution and provide a test of the model representation of photochemical processes if the transport is shown to be modeled appropriately. We have investigated the model advection further using diabatic trajectory calculations. For long lived constituents such as N2O, the model field for a particular time on a potential temperature surface is compared with a field produced by calculating 15 day back trajectories for a fixed latitude longitude grid, and mapping model N2O at the terminus of the back trajectories onto the initial grid. This provides a quantitative means to evaluate two aspects of the CTM transport: one, the model horizontal gradient between middle latitudes and the polar vortex is compared with the gradient produced using the non-diffusive trajectory calculation; two, the model vertical advection, which is produced by the divergence of the horizontal winds, is compared with the vertical transport expected from diabatic cooling.
Publication Date: Jan 01, 2000
Document ID:
20000096176
(Acquired Oct 06, 2000)
Subject Category: GEOPHYSICS
Document Type: Preprint
Meeting Information: Quadrennial Ozone Symposium; 3-8 Jul. 2000; Hokkaido,; Japan
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ADVECTION; LATITUDE; OZONE; PHOTOCHEMICAL REACTIONS; SENSITIVITY; STRATOSPHERE; WINTER; THREE DIMENSIONAL MODELS; HEAT TRANSFER; METEOROLOGICAL PARAMETERS; DATA SYSTEMS; CHLORINE; NITROGEN OXIDES; RADICALS; ATMOSPHERIC CHEMISTRY
Availability Source: Other Sources
Availability Notes: Abstract Only
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