Monitoring Stratospheric Temperature and Trends with Satellite Data March 3, 2005 R. Lin, A. J....
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Transcript of Monitoring Stratospheric Temperature and Trends with Satellite Data March 3, 2005 R. Lin, A. J....
Monitoring Stratospheric Temperature and Trends with Satellite Data
March 3, 2005
R. Lin, A. J. Miller, C. Long, J. Wild,
M. E. Gelman, S. Zhou, R. M. Nagatani (Ret)
Major Elements
• Total Ozone: SBUV/(/2) 1979-2004• Temperature Profiles: SSU 1979-2004• Temperature: MSU(4) 1979-2004
• Question: In an atmosphere where ozone is “recovering” and CO2 increasing, how do we separate temperature impacts?
Differences between zonal averages of SSU channel 25 radiance,simultaneous measurements from different spacecraft
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
-70 -50 -30 -10 10 30 50 70
Latitude [degrees]
Ra
dia
nc
e d
iffe
ren
ce
[r.
u.]
TN-N6
N7-N6,02/1982
N7-N6,07/1982
N7-N6,11/1982
N7-N8,08/1983
N7-N8,02/1984
N9-N6,1985/86
average ofnormal
Channel 25
• Instruments generally match within about 0.3 radiance units
• Exception is NOAA-9 which is about 0.5 radiance unit higher than others
Channel 26
• Instruments generally match within 2 radiance units
• Exception is NOAA-7 which is about 3 radiance units high
Channel 27
• Spectroscopic and tidal effects dominate
• General agreement between instruments of about 3 radiance units in equatorial region, increasing to about 5 radiance units in polar latitudes
AMSU => SSU
John Nash (UKMO) SSU Channels
Channel Peak of Weighting Function
47X 0.5 hPa
27 1.5
36X 2.0
26 6.0
25 15.0
26X 20.0
15X 50.0
AMSU => SSU via Statistical Regression NOAA-16 AMSU vs NOAA-14 SSU
10/00 – 10/02
14
SSU25, etc = a0 + ai x AMSUi
i=9
SSU/AMSU Standard Error of Regression 10/00 – 10/02
47x
2736x
262526x15x
The End