Computer Science – Performance
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3327m&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3327
Computer Science
Performance
Scientific paper
One aspect relevant to possible climate change is the transport and mixing of mass and chemical species in the Upper Troposphere / Lower Stratosphere region (UT/LS). Over the past 10 years, there has been increasing recognition of the heterogeneous nature of stratospheric transport and mixing, and of the existence of partial barriers to transport. The chemical isolation of the tropical stratosphere has been recognized as an example of such a transport barrier. The subtropical barriers are quasi-permeable at least some of the time. There has been clear evidence of horizontal mixing across these barriers, and of its connection with breaking of Rossby waves. The MSDOL mechanistic model is used here to study the impact of planetary-scale disturbances in meridional transport. The main objectives of the present contribution are to evaluate the model's performance in simulating a tropical air intrusion at midlatitudes during July 2000, and to test the role of different parts of the wave spectrum using filter techniques. The model dynamics is computed by solving the primitive equations in flux form on a three-dimensional grid with a resolution of 11.25^o in longitude, 5^o in latitude and about 3 km in the vertical. To simulate the dynamical evolution of the stratosphere in a realistic manner, the model is forced towards the NCEP analysis below 100 hPa. The main features of the July 2000 event are reproduced. To change the wave forcing the model is run with winds and temperature from the NCEP analysis filtered by zonal wavenumber and by phase speed. Comparisons between a reference simulation and various modified simulations are made and interpreted using diagnostic tools. The diagnostic framework for the transport and mixing properties of the isentropic flow is provided by the effective diffusivity approach. The effective diffusivity diagnostic is applied to fields of potential vorticity (PV) advected by the high-resolution advection model. Our results indicate that the July 2000 event involves slow eastward components.
Baldy Serge
Bencherif Hassan
Hauchecorne Alain
Keckhut Philippe
Morel Bertrand
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