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