The following plots are derived from the GEOS-5 0.67 x 0.5 gridded analyses and forecast. Details on GEOS-5. GEOS-5 is a comprehensive assilation system that is a product of the NASA GSFC Goddard Modeling and Assimilation Office.
The model analyses are filtered to expose traveling waves. The primary filter is based on
The plots show the zonal mean temperatures from the GEOS-5 analyses and forecasts. Usually the forecasts are separated from the analyses by a line.
Total 500hPa 450hPa 400hPa 350hPa 300hPa 250hPa 200hPa 150hPa 100hPa 70hPa 50hPa 40hPa 30hPa 20hPa 10hPa
Low Pass Filter 500hPa 450hPa 400hPa 350hPa 300hPa 250hPa 200hPa 150hPa 100hPa 70hPa 50hPa 40hPa 30hPa 20hPa 10hPa
High Pass Filter 500hPa 450hPa 400hPa 350hPa 300hPa 250hPa 200hPa 150hPa 100hPa 70hPa 50hPa 40hPa 30hPa 20hPa 10hPa
The plots show the zonal mean temperatures from the GEOS-5 analyses and forecasts. Usually the forecasts are separated from the analyses by a line.
Full Temperature
Temperature Deviation
Low Pass
High Pass
Filters
Two digital filters are used to isolate the wave propagation.
Low Pass is designed to filter all wave with periods greater than 20 days. The 1/2 amplitude response is set to 20 days.
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Band Pass is designed to filter waves between 1 and 20 days. The 1/2 amplitude response is set to 20 days and 1 day.
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Code 614 Atmospheric Chemistry and Dynamics Laboratory
NASA's Goddard Space Flight Center
Greenbelt, MD 20771
Building 33, Room E320, ph: (301) 614-5985 fax: x-5903
Last Updated: 2011-10-12
Author: Dr. Paul A. Newman (NASA/GSFC, Code 610) )