David Considine (PI)
NASA Langley Research Center
d.b.considine@larc.nasa.gov
Studies of Near Tropopause Ozone, Very Short-Lived Species, and Tropospheric
Physical Processes for the Global Modeling Initiative
The Global Modeling Initiative (GMI) is a NASA-led activity to develop
state-of-the-art modeling tools for the purpose of quantifying and reducing
uncertainties in global atmospheric model results, understanding the
coupling between atmospheric composition and climate, and contributing
to assessments of the effects of anthropogenic and natural perturbations
of atmospheric composition. We propose several investigations in support
of these goals, based on our past involvement with GMI, the current needs
of the GMI effort, and the interests of the assessment community, the
primary customer for GMI results. First, we propose to continue to lead
the effort to develop and utilize the GMI combined model of stratospheric
and tropospheric chemistry and dynamics, which will enable investigations
of the near-tropopause region (NTR) of the atmosphere. We will oversee
the implementation and testing of a new photolysis scheme and a new combined
chemistry solver, and continue evaluating the characteristics of GMI
combined model ozone distributions in the NTR using ozonesonde and satellite
observations. Second, we propose to utilize the GMI model to investigate
the contribution to stratospheric halogen concentrations from the decay
of very short-lived halocarbon source gas species, paying particular
attention to the relative importance of the product gas injection (PGI)
and source gas injection (SGI) transport pathways and their sensitivity
to the meteorological data used to drive the model. Third, we propose
to continue providing diagnostic and scientific studies of tropospheric
physical processes such as convection and wet scavenging using radionuclide
simulations and other tropospheric species, and Fourth we will continue
to maintain the current polar stratospheric cloud scheme for the GMI.
+ Back to Participant Listing |
