Ozone Data in the CFSRR

Craig S. Long, Shuntai Zhou – NCEP/CPCRuss Treadon, Jack Woollen, Haixai Liu – NCEP/EMC Larry Flynn, Trevor Beck, Eric Beach – NESDIS/STAR

Donna McNamara – NESDIS/OSDPD

Ozone in CFSRR vs R1&R2 and ERA40

• CFSRR (and GFS)– SBUV and SBUV/2 (version 8)

• Nadir Profiler ~ 100 obs per orbit• Sun-lite part of Earth

– Version 8 Attributes• Climate trend quality

– Inter-satellite differences are minimized (at the equator)• Better troposphere estimates• V8 has more layers (21 vs 12)• Calibrations of N16, 17, and 18 are configured to give similar results• Expandable to hyperspectral instruments (i.e. OMI, GOME-2, OMPS (nadir)• Integrated Profile Ozone regarded better than ‘Best’ Ozone

– What about TOMS, MLS, GOME, OMI?• R1 and R2

– Does not assimilate ozone• Uses monthly climatological profiles and total ozone

• ERA40 – Did assimilate ozone

• SBUV and SBUV/2 (version 6) • TOMS (version 6)

Ozone Related Issues

• Treatment of ozone in CFSRR same as operational GFS• Will ozone be ‘reasonable’ in polar night

– Does it matter radiatively?

• No heterogenious ozone chemistry– Ozone hole is created only by satellite obs– Only a couple of years where satellite drift impacts timing of ozone

hole observation.• Where TOMS data would be a benefit to have.

• Restrictive use of data only flagged as ‘good’• Minimal use of NOAA-14 data• Transition from one satellite to the next• Use as many satellites as possible with ‘good’ data

Time Periods of SBUV and SBUV/2 ozone productsMonths are inclusive

• Nimbus7 11/1978 - 06/1990• NOAA9a 02/1985 - 04/1988• NOAA11a 12/1988 - 09/1993• NOAA9d 11/1992 - 01/1998• NOAA14 07/1995 - 10/1995

– Covers 2 month gap in N9d (08 & 09/1995)• NOAA11d 09/1997 - 03/2001• NOAA16 10/2000 – present• NOAA17 07/2002 - present• NOAA18 01/2006 – present• A one month gap in 03/1991 will be filled with profiles generated

from TOMS data.

SBUV and SBUV/2 Satellite Time Periods for CFSRR

0

1

2

3

4

5

6

7

8

9

10

11

1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008

N7 N9a N11a TOMS N9d N14 N11d N16 N17 N18

N7N9a

N11a

TOMS

N9d

N11dN14

N16

N17

N18

Terminator Latitude for Time Periods in CFSRR

-90

-70

-50

-30

-10

10

30

50

70

90

1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008

Ter

min

ator

Lat

itud

e

N7 N9 N11 N14 N16 N17 N7 N9 N11 N14 N16 N17 N18 N18

Equatorial SZA for Time Periods in CFSRR

0

10

20

30

40

50

60

70

1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008

SZ

A

N7 N9 N11 N14 N16 N17 N18

Validation

• During CFSRR runs– Monthly zonal mean comparisons against CPC SBUV/2 zonal

means.

• During evaluation period– Comparisons against:

• Ozonesondes

• Lidar

• Dobson/Brewers

• SAGE/HALOE

• MLS

Restrictive Use of only ‘Good’ Data

V8 SBUV Profile Ozone QC Flagging Frequency: Good

N7 N11a N9d N11d N16

Per

cent

Occ

urre

nce

Questions?