NCAR Climate Data Guide Content with Tag: SAM

Marshall Southern Annular Mode (SAM) Index (Station-based)
Years of Record: 1957/01 to 2015/09
The station-based index of the Southern Annular Mode (SAM) is based on the zonal pressure difference between the latitudes of 40S and 65S.  As such, the SAM index measures a "see-saw" of atmospheric mass between the middle and high latitudes of the Southern Hemisphere.  Positive values of...
Main variables and Earth System components:
Formats: ascii Domain: Antarctic, SH - Southern Hemisphere, Southern Ocean
See Expert Guidance by Marshall, Gareth
Annual mean 850hPa westerly wind component (contributed by T Bracegirdle)
Southern Hemisphere westerly jet strength and position
Years of Record: 1979/12 to 2016/12
The dynamics of the Southern Hemisphere westerly jet are described in terms of two indices, jet strength and jet latitude.  Here, these indices are defined using the ERA-Interim reanalysis, although other datasets, including climate models, could be used.  Although closely linked with the...
Main variables and Earth System components:
Formats: ascii Timestep: Seasonal,Annual Domain: Antarctic, SH - Southern Hemisphere, Southern Ocean
See Expert Guidance by Bracegirdle, Thomas J.
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