MIPAS Quality Working Group #41 ESRIN, 6-8 April … ADF coverage and variation ... 01/03 – 23/02 08/03 ... that the auxiliary gain file introduce radiance variation in the band-B

MIPAS Quality Working Group #41

ESRIN, 6-8 April 2016

Gain ADF coverage

and variation

Marta De Laurentis [email protected]

Alessandro Piro [email protected]

Angelika Dehn [email protected]

Scope:

Investigate the potential anomalies due to gain auxiliary file coverage in the processing from LØ

L1 products (v7 and v8)

Activity:

Extraction of used Gain files in the processing from LØ L1 products

Analysis of v7 Gain Files (weekly, both measured and interpolated) vs. Full Mission LØ Products

Generate yearly maps of Gain ADF coverage

Identification, Inspection and Mapping of detected events by:

ISAC (ref. e-mail 21-22/03/2016, “analysis of Radiances Band-B [20N - 65N]”)

IFAC (ref. e-mail 14/03/2016, “CH4 and N2O discontinuities”)

Generation of plots of band-B radiometric gain variation

Objective

Obtain a list of time periods along the mission duration (2002-2012) with products potentially

affected by gain issues in band-B, which could bring to CH4 and N2O discontinuities.

Evaluate the percentage of variation between two consecutive Gain ADFs

Scope/Objective

MIPAS QWG #41, ESRIN 6-8 April 2016

Example and Cases

Period Event Identified by:

13-21 May 2010 Passive Decontamination

ISAC IFAC

IDEAS+

05-20 October 2008 Passive Decontamination

ISAC IFAC

IDEAS+

25 November – 10 December 2009

N/A ISAC

IDEAS+

03-06 March 2012 N/A ISAC

19 September-03 October 2007

Interruption

N/A IDEAS+


Different cases have been identified by cross checking the operations plan, list of discontinuities

and yearly maps. For example:

May 2010


IFAC: [13 – 21] May Discontinuities in

CH4 and N2O

ISAC: Radiance Variation at 15 May

IDEAS+: Comparison with previous

gain > 2% in band B before and after

passive decontamination

12/05 – 04/05

19/05 – 12/05

26/05 – 19/05

October 2008


IFAC: [14 – 20] October Discontinuities in CH4

and N2O

ISAC: Radiance Variation [15 - 20] October

IDEAS+: Comparison with previous gain > 2% &

> 3% in band B before and after passive

decontamination

12/10 – 29/09

19/10 – 12/10

26/10 – 19/10

25 November - 10 December 2009

IDEAS+: Radiance Variation between 29/11 and 07/12

ISAC: Radiance Variation, reported at 8 December

Apparently NO particular events occur.


29/11 – 23/11

07/12 – 29/11

14/12 – 07/12


03-06 March 2012

ISAC Discontinuities in Radiance Band-B (03 - 06 March).

IDEAS+: Gain seems OK. Instrument in operational mode

01/03 – 23/02

08/03 – 01/03

16/03 – 08/03

19 September- 03 October 2007 1/2


IDEAS+: Comparison with previous gain [30 – 23/09] >

3% in band B for instrument Interruption (as

expected).

23/09 – 19/09

30/09 – 23/09

01/10 – 30/09

19 September- 03 October 2007 2/2


IDEAS+: Interesting periods where gain are very close, comparison

provides variations [02/03 Oct.] > 2% and > 1%

ABB ADF TN: reports a note with a Gain variation > 3% needs of

daily gain processing.

02/10 – 01/10

03/10 – 02/10

09/10 – 03/10

Possible Problems in V8,

also processing daily gains

Min/Mean/Max Gain Percentage Variation [June 2002 – April 2004]


The Percentage Variation Min/Max/Mean values have been reported

Min/Mean/Max Gain Percentage Variation [August 2004 – March 2012]


Some dates have been identified and mapped vs planning operations (including

interruptions, passive decontamination)

Conclusion

Conclusions:

After a passive decontamination, reduced duty cycle or an operations interruption period it seems

that the auxiliary gain file introduce radiance variation in the band-B in the period just after.

In few cases the radiance variation is > 2% without any operations interruptions.

Note: Visible spike at ~ 1380 cm-1 in gain variations plots.

For the v8 gain coverage maps are on-going.



Periods for which the gain in band B should be investigated (2002-2005)

From planning, gain availabilities and gain variations the following cases have been identified:

IFAC ISAC IDEAS+

(Potential Affected Products)

IDEAS+ Gain Variation [%]

CH4-N2O discontinuities in daily mean time-

series

Radiance vs. orbit number

[Radiance 20N-65N Band B]

Start Date Stop Date Analysis of percentage variations of two consecutive gains

2002

30-Jul. 06-Aug. Gain Variation [30 Jul – 12 Aug] > 4%

06-Sep. 08-Sep. Gain Variation [06 -12 Sept] > 2%

10-Oct. 15-Oct. Gain Variation [25 Sep – 11 Oct] > 4% (Operations Interruption) Gain Variation [10 – 15 Oct] > 3%

(21-22) Nov. 21-Nov. 26-Nov. Gain Variation [14 - 22 Nov] > 1.5% (Operations Interruption) Gain Variation [22 – 26 Nov] > 1.5%

2003

(23-25) Feb. 23-Feb. 24-Feb. Gain Variation [19 - 24 Feb] ~1% - [24 Feb – 03 Mar] < 2%

(20 Mar.-13 Apr.) 09-Apr. 15-Apr.

Gain Variation [20 - 30 Mar] < 1%

Gain Variation [30 Mar – 07 Apr] > 3.5% (Passive Decontamination) Gain Variation [12 Apr – 15 Apr] ~ 1.5%

(9-10) Sep. 08-Sep. 09-Sep. Gain Variation [28 Aug – 08 Sep] > 1%

12-Sep. 13-Sep. Gain Variation [09 Sep – 13 Sep] ~ 2%

06-Dec. 06-Dec. Gain Variation [29 Nov – 06 Dec] ~1.5% Gain Variation [06 – 12 Dec] > 2%

2004

08-Feb. 15-Feb. Gain Variation [08 – 15 Feb] > 1%

2005

07-Feb. 05-Feb. 11-Feb. Gain Variation [07 – 11 Feb] >1%

03-Jun. 22-May 23-May Gain Variation [22 May – 03 Jun] >25% (Passive Decontamination)

Periods for which the gain in band B should be investigated (2006 - 2008)


IFAC ISAC IDEAS+




series




2006

27-Mar. 28-Mar. Gain Variation [27 – 30 Mar] > 3% (Operations Interruption) 30 –Mar. 10-Apr. Gain Variation [30 Mar - 10 Apr] > 4% (Reduced Duty Cycle + Operations Interruption) 10-Apr. 13-Apr. Gain Variation [10- 21 Apr] > 2.5% (Operations Interruption)

30-Aug. 07-Sep. Gain Variation [30 Aug – 19 Sep] > 2% (Reduced Duty Cycle + Operations Interruption) 23-Nov. 28-Nov. Gain Variation [23 Nov – 01 Dec] > 2% (Reduced Duty Cycle + Operations Interruption)

(04-09) Dec. 01 Dec. 01-Dec. 08-Dec. Gain Variation [01 – 08 Dec] > 3.5 % (Reduced Duty Cycle) 2007

(27 Apr.-19 May) N/A Gain Variation [28 Apr – 04 May] <0.5 % Gain Variation [04 – 10 May] < 0.5 % Gain Variation [10 – 20 May] < 0.5 %

06-Jun. 06-Jun. Gain Variation [27 May – 06 Jun] > 3.5 % (Reduced Duty Cycle) 17 Jul. 17 Jul. Gain Variation [11 – 23 Jul] < 0.5 %

29-Sep. 30-Sep. Gain Variation [23 – 29 Sep] > 3.5 % (Operations Interruption) 02-Oct. 03-Oct. Gain Variation [02 – 03 Oct] > 2 %

(25-28) Oct. 24-Oct. 28-Oct . Gain Variation [16 – 24 Oct] ~ 1.5 % (Passive Decontamination) Gain Variation [24 – 28 Oct] > 2 %

06-Dec. 08-Dec. Gain Variation [01 – 08 Dec] > 3 % (Operations Interruption) 2008

(08-22) May ~ [10 - 20] May 18-May 22-May

Gain Variation [07 – 15 May] < 0.5 % (After Passive Decontamination) Gain Variation [15 – 18 May] < 0.5 %

Gain Variation [18 – 22 May] > 1 % (Operations Interruption)

02 Aug. N/A Gain Variation [30 Jul – 02 Aug] < 0.5 % Gain Variation [02 – 06 Aug] < 0.5 %

(14-20) Oct. ~ [15 - 20] Oct. 12-Oct. 19-Oct. Gain Variation [29 Sep – 12 Oct] > 2.5 %

Gain Variation [12 – 19 Oct] > 3.5 % (After Passive Decontamination)



IFAC ISAC IDEAS+




series




2009

(29-30) Jul. N/A Gain Variation [19 – 30 Jul] < 0.5 %

Gain Variation [30 Jul – 11 Aug] < 0.5 %

(29 Oct. - 12 Nov.)

28-Oct. 11-Nov.

04-Nov. 12-Nov.

Gain Variation [23 Oct – 11 Nov] > 1.5 % (Passive Decontamination)

23 Nov. N/A Gain Variation [12 – 23 Nov] < 1% Gain Variation [23 – 29 Nov] < 0.5%

29-Nov. 07-Dec. Gain Variation [29 Nov – 07 Dec] > 2%

07 Dec. 8 Dec. N/A Gain Variation [07 – 14 Dec] < 0.5 %

2010

(13-21) May 15 May 12- May 19- May Gain Variation [04 – 12 May] > 2 % (Passive Decontamination) Gain Variation [12 – 19 May] > 2 %

21 Jul. 14 -Jul. 21- Jul. Gain Variation [14 – 21 Jul] ~ 1.5 %

(04-21) Oct. 11- Oct. 20 -Oct.

13- Oct. 21-Oct.

Gain Variation [29 Sep – 06 Oct] < 0.5 %

Gain Variation [06 – 11 Oct] ~ 0.5 %

Gain Variation [11 – 20 Oct] ~ 2.5 % (Passive Decontamination)

28 Oct. 28 -Oct. 28- Oct. Gain Variation [20 – 28 Oct] ~ 1.2 % (Orbit Lowering Manoeuvres) Gain Variation [28 Oct – 04 Nov] < 0.5 %



IFAC ISAC IDEAS+




series




2011

(05-12) Apr 06-Apr. 07-Apr. Gain Variation [31 Mar – 07 Apr] < 0.5 % (Operations Interruption) Gain Variation [07 Apr – 14 Apr] ~ 1.5 %

14 Apr. N/A Gain Variation [14 Apr – 21 Apr] ~ 0.5 %

17 May 18 May Gain Variation [17 May – 25 May] ~ 3 % (Passive Decontamination)

Sep.-Oct. 10-Set. 21-Set. Gain Variation [08 – 15 Sep] > 2 % (Operations Interruption) Gain Variation [15 – 21 Sep] ~ 1.5 % Gain Variation [21 – 29 Sep] < 0.5 %

Sep.-Oct. 20-Oct. 27-Oct. Gain Variation [20 – 27 Oct] ~ 1.5 % (Passive Decontamination) Gain Variation [27 Oct – 03 Nov] < 0.5 %

2012

03/06-Mar N/A Gain Variation [01 – 08 Mar] < 0.5 %

V8 Gain Coverage Analysis (On-Going) Example: Year 2012

Analysis of v8 Gain Files (Daily) vs. Full Mission LØ Products


Questions ?

Thank You for your

attention


Documents

MIPAS Quality Working Group #41 ESRIN, 6-8 April … ADF coverage and variation ... 01/03 – 23/02 08/03 ... that the auxiliary gain file introduce radiance variation in the band-B