Evaluation of near-tropopause ozone distributions in the Global Modeling Initiative combined stratosphere-troposphere model with ozonesonde dataReport as inadecuate




Evaluation of near-tropopause ozone distributions in the Global Modeling Initiative combined stratosphere-troposphere model with ozonesonde data - Download this document for free, or read online. Document in PDF available to download.

1 NASA Headquarters 2 Harvard University Cambridge 3 Goddard Earth Sciences and Technology Center

Abstract : The NASA Global Modeling Initiative has developed a combined stratosphere-troposphere chemistry and transport model which fully represents the processes governing atmospheric composition near the tropopause. We evaluate model ozone distributions near the tropopause, using two high vertical resolution monthly mean ozone profile climatologies constructed with ozonesonde data, one by averaging on pressure levels and the other relative to the thermal tropopause. Model ozone is high-biased at the SH tropical and NH midlatitude tropopause by ~45% in a 4° latitude × 5° longitude model simulation. Increasing the resolution to 2°×2.5° increases the NH tropopause high bias to ~60%, but decreases the tropical tropopause bias to ~30%, an effect of a better-resolved residual circulation. The tropopause ozone biases appear not to be due to an overly vigorous residual circulation or excessive stratosphere-troposphere exchange, but are more likely due to insufficient vertical resolution or excessive vertical diffusion near the tropopause. In the upper troposphere and lower stratosphere, model-measurement intercomparisons are strongly affected by the averaging technique. NH and tropical mean model lower stratospheric biases are



Author: D. B. Considine - J. A. Logan - M. A. Olsen -

Source: https://hal.archives-ouvertes.fr/



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