EASE-Grid Tb Time Series

EASE-Grid Brightness Temperature Time Series

Test site locations:

Dome C, Antarctica (74.5S 123.0E): pixel containing Automatic Weather Station (AWS)
Siple, Antarctica (75.9S 84.0W): another AWS
"Coldsite", Antarctica (78.0S 24.5E): no AWS, very cold, topography homogeneous
"Ocean" (cold ocean, south of Australia) (35.0S 130.0E): cold ocean, but not so far south that high winds would often affect TB
Tibetan plateau (35.25N 94.0E): cold, dry, high altitude, homogeneous topography
Saharan desert (24.0N, 1.0W): warm, dry, homogeneous topography
Little Washita, SGP Site (35.0N, 98.1W): selected by E. Njoku
Central Brazil (8.5S, 54.4W): jungle target, selected by E. Njoku
Lonoke Farm, AR (34.8N, 91.9W): USDA/ARS SCAN site

Changes as of 10/26/2001: SMMR differences are derived from weekly-averaged TBs; time series by station are done as single jpegs (these load faster) and tables of individual jpegs.

Changes as of 10/30/2001: Poster text and figures.

Changes as of 10/31/2001: Poster as PDF.

Changes as of 11/1/2001: AWS data for Siple and Dome C.

Poster for Microwave Remote Sensing Meeting

AWS Time Series at Siple and DomeC

Time Series with/without Jezek corrections

18,19V, before and after Jezek corrections (corrected_TB = 0.870 * TB + 21.90)
18,19H, before and after Jezek corrections (corrected_TB = 0.940 * TB + 2.62)
37V, before and after Jezek corrections (corrected_TB = 0.861 * TB + 30.20)
37H, before and after Jezek corrections (corrected_TB = 0.954 * TB + 2.85)

Time Series of 18,19 and 37 GHz, by Station

Dome C (single jpeg Loads faster) or (individual jpegs)
Siple (single jpeg Loads faster) or (individual jpegs)
Cold Site (single jpeg Loads faster) or (individual jpegs)
Tibet (single jpeg Loads faster) or (individual jpegs)
Sahara (single jpeg Loads faster) or (individual jpegs)
So. Ocean (single jpeg Loads faster) or (individual jpegs)
Little Washita (single jpeg Loads faster) or (individual jpegs)
Central Brazil (single jpeg Loads faster) or (individual jpegs)
Lonoke Farm (single jpeg Loads faster) or (individual jpegs)

"Average seasonal differences" were calculated for each sensor (SMMR, DMSP-F08, -F11 and -F13) as the difference between the average maximum and average minimum TB for each season over the life of the sensor. The average extrema were calculated from the 10 warmest/coldest TBs in each season.

The black line in each plot is the smoothed time series (smoothing window is 15 data points wide).

Why do SMMR warm-cold temperatures for Dome C and ColdSite appear to have periodic patterns, always negative, but most negative in winter, while siple doesn't show this odd behavior/discontinuity with SSM/I? Is thermal heating at the beginning of SMMR on/off cycle a possible explanation? See

Thermal Heating

M. J. Brodzik <brodzik@zamboni.colorado.edu>

Last modified: Fri Sep 28 14:18:19 2001