Validation of the Ozone Monitoring Instrument Total Ozone Column and Implications for Trend Studies...

Validation of the Ozone Monitoring Instrument Total Ozone Column and

Implications for Trend Studies

M. Kroon1, R.D. McPeters2, J.P. Veefkind1, G. Labow2, D. Balis3, I. Petropavlovskikh4, P.K. Bhartia2, R. Shetter4 and P.F. Levelt1

1.Royal Netherlands Meteorological Institute, 2.NASA Goddard Space Flight Center, 3.Aristotle University of Thessaloniki, 4.NOAA/ESRL, 5.National Center for Atmospheric Research

OMI Science Team Meeting

Helsinki, 24 June 2008

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 2

Total Ozone Column ECS2 > COL3

OMI TOMS V8.5 [DU]OMI TOMS V8.0 [DU]

ECS2COL3 September 2005


Total Ozone Column ECS2 > COL3

ECS2COL3

DOAS v1.0.5 [DU]DOAS v1.0.1 [DU]

September 2005


Changing Collection OMI-DOAS

OMDOAO3 algorithm v1.0.5 release for OMI Collection 3 data.

Collection 3 Level 1B has better dark current and stray light corrections yielding better fitting residuals and lower chi-squared.

Treatment of high reflective surfaces (snow/ice) changed. Effective cloud fraction set to zero and surface albedo fitted (~OMTO3).

Airmass factor tables updated. AMF tables primary cause for Solar Zenith Angle dependent bias. New air mass factor tables are based on improved radiative transfer calculations.

Look-up table for cloud radiance fraction updated. New radiative transfer calculations include atmospheric sphericity.

New static irradiance file produced by combining Solar irradiance data of collection 3 for year 2005.


Changing Collection OMI-TOMS

OMTO3 algorithm v8.5 release for OMI Collection 3 data.

Ingesting daily OMCLDRR (Raman) cloud effective pressure and fraction “CloudFractionForO3” and “CloudPressureForO3”.

Treatment of high reflective surfaces (snow/ice) changed. Cloud fraction set to zero at snow ice fraction >50%.

Jump at Solar Zenith Angle 69º corrected by switching off change in climatological ozone profile used.

Collection 3 Level 1B stray light corrections change yields OMTO3 to drop 6-7 DU on global scale. Under discussion!.

OMSO2 algorithm improved yielding higher SO2 PBL values hence more SO2 polluted pixels correctly flagged hence less influence.


Total Ozone Column ECS2 > COL3Whole Globe OMITotal Ozone ECS2

260

270

280

290

300

310

320

330

340

Sep

-04

Nov-0

4

Jan

-05

Mar-

05

May-0

5

Jul-

05

Sep

-05

Nov-0

5

Jan

-06

Mar-

06

May-0

6

Jul-

06

Sep

-06

Nov-0

6

Jan

-07

Mar-

07

May-0

7

Jul-

07

Sep

-07

Time (months)

Tota

l O

zon

e C

olu

mn

[D

U]

OMI TOMSOMI DOAS

Whole Globe OMITotal Ozone COL3

260

270

280

290

300

310

320

330

Oct-0

4

Jan-

05

Apr-05

Jul-0

5

Oct-0

5

Jan-

06

Apr-06

Jul-0

6

Oct-0

6

Jan-

07

Apr-07

Jul-0

7

Oct-0

7

Jan-

08

Apr-08

Time (months)

Tota

l O

zon

e C

olu

mn

[D

U]

OMI TOMSOMI DOAS

Closer Match!

Close Match


Total Ozone Column ECS2 > COL3Whole Globe OMI

Total Ozone Regression ECS2

0.85

0.90

0.95

1.00

1.05

Sep

-04

Nov

-04

Jan

-05

Mar

-05

May

-05

Jul-

05

Sep

-05

Nov

-05

Jan

-06

Mar

-06

May

-06

Jul-

06

Sep

-06

Nov

-06

Jan

-07

Mar

-07

May

-07

Jul-

07

Sep

-07Time (months)

Cor

rela

tion

Reg

ress

ion

RegressionCorrelation

Whole Globe OMITotal Ozone Regression COL3

0.85

0.90

0.95

1.00

1.05

Oct-0

4

Jan-

05

Apr-05

Jul-0

5

Oct-0

5

Jan-

06

Apr-06

Jul-0

6

Oct-0

6

Jan-

07

Apr-07

Jul-0

7

Oct-0

7

Jan-

08

Apr-08

Time (months)

Cor

rela

tion

Reg

ress

ion

RegressionCorrelation

0.90 < Regression < 1.030.91 < Correlation < 0.99

0.85 < Regression < 1.000.89 < Correlation < 0.98


Total Ozone Column ECS2 > COL3Whole Globe OMI

Total Ozone Difference ECS2

-10

-5

0

5

10

15

20

25

Sep

-04

Nov

-04

Jan

-05

Mar

-05

May

-05

Jul-

05

Sep

-05

Nov

-05

Jan

-06

Mar

-06

May

-06

Jul-

06

Sep

-06

Nov

-06

Jan

-07

Mar

-07

May

-07

Jul-

07

Sep

-07

Time (months)

Diff

eren

ce a

nd

Sta

n.

Dev

. [D

U]

OMI TOMS-DOASStandard Deviation

Whole Globe OMITotal Ozone Difference COL3

-10

-5

0

5

10

15

Oct-0

4

Jan-

05

Apr-05

Jul-0

5

Oct-0

5

Jan-

06

Apr-06

Jul-0

6

Oct-0

6

Jan-

07

Apr-07

Jul-0

7

Oct-0

7

Jan-

08

Apr-08

Time (months)

Diff

eren

ce a

nd

Sta

n.

Dev

. [D

U]


-7 < Difference < 18 < Deviation < 12

-8 < Difference < 310 < Deviation < 19


Total Ozone Column ECS2 > COL3Northern Hemisphere OMI

Total Ozone Difference ECS2

-15

-10

-5

0

5

10

15

20

25

Sep

-04

Nov

-04

Jan

-05

Mar

-05

May

-05

Jul-

05

Sep

-05

Nov

-05

Jan

-06

Mar

-06

May

-06

Jul-

06

Sep

-06

Nov

-06

Jan

-07

Mar

-07

May

-07

Jul-

07

Sep

-07

Time (months)

Diff

eren

ce a

nd

Sta

n.

Dev

. [D

U]


Southern Hemisphere OMITotal Ozone Difference ECS2

-10

-5

0

5

10

15

20

Sep

-04

Nov

-04

Jan

-05

Mar

-05

May

-05

Jul-

05

Sep

-05

Nov

-05

Jan

-06

Mar

-06

May

-06

Jul-

06

Sep

-06

Nov

-06

Jan

-07

Mar

-07

May

-07

Jul-

07

Sep

-07

Time (months)

Diff

eren

ce a

nd

Sta

n.

Dev

. [D

U]


Northern Hemisphere OMITotal Ozone Difference COL3

-10

-5

0

5

10

15

Oct-0

4

Jan-

05

Apr-05

Jul-0

5

Oct-0

5

Jan-

06

Apr-06

Jul-0

6

Oct-0

6

Jan-

07

Apr-07

Jul-0

7

Oct-0

7

Jan-

08

Apr-08

Time (months)

Diff

eren

ce a

nd

Sta

n.

Dev

. [D

U]


Southern Hemisphere OMITotal Ozone Difference COL3

-10

-5

0

5

10

15

Oct-0

4

Jan-

05

Apr-05

Jul-0

5

Oct-0

5

Jan-

06

Apr-06

Jul-0

6

Oct-0

6

Jan-

07

Apr-07

Jul-0

7

Oct-0

7

Jan-

08

Apr-08

Time (months)

Diff

eren

ce a

nd

Sta

n.

Dev

. [D

U]



TO3C Difference ECS2 > COL3

OMI TOMS V8.5 - DOAS v1.0.5 [DU]

October 2005

OMI TOMS V8.0 - DOAS v1.0.1 [DU]

ECS2COL3


TO3C Single Orbits ECS2


TO3C Single Orbits COL3


Influence of Sulphur Dioxide ECS220.2 N

139.0 E 152.4 E

12.4 N

20.2 N

139.0 E 152.4 E

12.4 N


Influence of Sulphur Dioxide COL320.2 N

139.0 E 152.4 E

12.4 N

20.2 N

139.0 E 152.4 E

12.4 N


Influence of Clouds ECS2


Influence of Clouds COL3


Ground Based vs OMTO3

OMI AO 2925 - Validation of OMI total ozone using ground-based Brewer observations. Dr. Dimitris Balis, Aristotle University of Thessaloniki - Laboratory of Atmospheric Physics, Greece

ECS2COL3


Ground Based vs OMTO3


ECS2COL3


Ground Based vs OMDOAO3


ECS2COL3


Ground Based vs OMDOAO3


ECS2COL3


Brewer Dobson

<O-G>/G (O-G) <O-G>/G (O-G)

OMI DOAS 0.483 % 2.754 % 0.070 % 1.653 %

OMI DOAS* -0.555 % 0.200 % 0.086 % 1.601 %

OMI TOMS -0.504 % 2.704 % -0.631 % 1.032 %

OMI TOMS* -1.450 % 0.425 % -0.645 % 1.064 %

* No South Pole (lat > 75 S)

Ground Based Validation COL3


NASA WB-57 no.926NASA DC-8 no.817


DOAS vs CAFS∆=10 DU=2.9%

TOMS vs CAFS∆= -5.8 DU=-1.8%

Polar-AVE 20050129 OMI Orbit 2890 CAFS


Aura Validation Experiment OMI CAFS

OMI-DOAS OMI-TOMSOMI-CAFS (O-C)/O STD OMI-CAFS (O-C)/O STD

Polar-AVE 10.12 DU 2.89 % 10.36 DU -5.85 DU -1.75 % 12.54 DU

Houston AVE -6.06 DU 2.09 % 9.09 DU -2.27 DU -0.77 % 9.47 DU

Costa Rica AVE -8.12 DU -3.40 % 5.92 DU -8.61 DU -3.62 % 3.89 DU

ALL AVE -2.02 DU -0.70 % 11.70 DU -5.14 DU -1.79 % 9.59 DU


Solar Zenith Angle 200505

NH SH WG

NH SH WG

COL3

ECS2


Required Accuracy

3%

100 DU

Validation of ECS2 has led to many modifications made to the respective algorithms for COL3 reprocessing.

For COL3 agreement is found within 1-2 % with reference data. Continuing the TOMS total ozone record (> November 1978) is thus achievable with OMI total ozone.

Remaining difference between OMI-TOMS and OMI-DOAS total ozone estimates are significant in size compared to dynamic range covered by trends.

Both algorithms are sensitive to calibration changes, but not up to the level that becomes significant for trends.


Data Availability

OMI DOAS Total Ozone Column : NASA DISC and NASA AVDChttp://disc.gsfc.nasa.gov/Aura/OMI/index.shtmlhttp://avdc.gsfc.nasa.gov/index.php?site=2045907950

OMI TOMS Total Ozone Column : NASA DISC and NASA AVDChttp://disc.gsfc.nasa.gov/Aura/OMI/index.shtmlhttp://avdc.gsfc.nasa.gov/index.php?site=2045907950

OMI Near Real Time Total Ozone Column : KNMI TEMIShttp://www.temis.nl/protocols/O3total.html (NRT)http://www.temis.nl/protocols/O3global.html (Assim)

OMI Very Fast Delivery Total Ozone Column : FMI OMIVFDhttp://omivfd.fmi.fi/cgi-bin/products.pl

OMI Ozone Profiles : NASA AVDC (provisional)http://avdc.gsfc.nasa.gov/index.php?site=1980959093&id=39


Date post:	01-Apr-2015
Category:	Documents
Upload:	aniyah-yongue
View:	217 times
Download:	3 times

Validation of the Ozone Monitoring Instrument Total Ozone Column and Implications for Trend Studies...

Documents