terra/aqua instrument calibration: sw revision 1 · 2007-12-06 · terra/aqua instrument...

48
Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant Matthews, Peter Szewczyk, Dale Walikainen, Robert Wilson CERES Science Team Meeting Williamsburg, VA May 2-4, 2006

Upload: others

Post on 11-Aug-2020

3 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

Terra/Aqua Instrument Calibration: SW Revision 1

Kory J. PriestleySusan Thomas, Denise Cooper,

Phil Hess, Grant Matthews, Peter Szewczyk,Dale Walikainen, Robert Wilson

CERES Science Team MeetingWilliamsburg, VA

May 2-4, 2006

Page 2: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Instrument Working Group Homepage

http://asd-www.larc.nasa.gov/Instrument

Page 3: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Agenda

Today’s talks are going to be primarily concerned with SW Calibrationissues… whether they impact the SW or SW/TOT channels.

- Provide a status of the BDS and ERBE Like Data Products

- Edition 3 vs. Edition2_Rev1

- Potential modifications of the Cal/Val protocol.

- Use Deep Convective Clouds vs. SWICS Lamps

- New operational constraints,

- impacts to special operations

- Detailed discussion of Edition3 algorithm modifications.

Page 4: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Questions and Comments for thought

1. In Edition3 does the Science Team want all of the CERES instrumentsplaced on the same radiometric scale?

2. Is the Science Team comfortable with using Deep Convective Clouds asa relative calibration target?

3. New operational constraints require additional justifications for fieldcampaign/intercalibration coverage requests.

Page 5: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Terra/Aqua Health & Status

With the exception of the SW channel on the CERES/Aqua FM-4 Instrument,

the CERES Terra/Aqua instruments are functioning nominally…

???FM5?

46 +

76 +

9

Collected Data(Months)

6/025/02FM3, FM4Aqua

3/0012/99FM1, FM2Terra

1/9811/97PFMTRMM

ScienceInitiationLaunchInstrumentsSpacecraft

Page 6: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Terra/Aqua Health & Status

With the exception of the SW channel on the CERES/Aqua FM-4 Instrument,

the CERES Terra/Aqua instruments are functioning nominally…

???FM5?

46 +

76 +

9

Collected Data(Months)

6/025/02FM3, FM4Aqua

3/0012/99FM1, FM2Terra

1/9811/97PFMTRMM

ScienceInitiationLaunchInstrumentsSpacecraft

20.3 Instrument Years of Data

Page 7: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

BDS and ERBE-Like Release Strategy

Edition1 - Static Algorithms and coefficients - baseline product used in cal/val protocol

Edition2 - Utilizes temporally varying coefficients to correct for traceable radiometric drift. All spectral changes are broadband and ‘gray’.

Edition3 - Release date Fall 2006. Will incorporate temporally varying spectral artifacts in the SW measurements. A complete re-analysis of Ground Calibration with additional component characterization measurements.

User Applied Revisions - Advance capabilities to the users prior to therelease of the next Edition.

Edition2 products lag Edition1 by a minimum of 4 months

Page 8: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Notification of RevisionCERES BDS (BiDirectional Scan) TerraEdition2Data Quality Summary

Investigation: CERESData Product: BiDirectional Scan [BDS]Data Set: Terra (Instruments: FM1, FM2)Data Set Version: Edition2

The purpose of this document is to inform users of the accuracy of this data product as determined by the CERES Team. This documentbriefly summarizes key validation results, provides cautions where users might easily misinterpret the data, provides links to furtherinformation about the data product, algorithms, and accuracy, gives information about planned data improvements. This document alsoautomates registration in order to keep users informed of new validation results, cautions, or improved data sets as they become available.

This document is a high-level summary and represents the minimum information needed by scientific users of this data product. It is stronglysuggested that authors, researchers, and reviewers of research papers re-check this document for the latest status before publication of anyscientific papers using this data product.

Table of Contents•Nature of the BDS Product•Updates to Current Edition•User Applied Revisions•Validation and Quality Assurance•Current Estimated Uncertainty of Data•Cautions When Using Data•Expected Reprocesings•References•Web links to Relevant information•Referencing Data in Journal Articles•Giving Data to Other Users

Page 9: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES SSF Ed2B SW TOA Flux Anomaly

Clear Ocean

Clear Desert

Page 10: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Terra SW Internal Calibration ResultsFM1 In-Flight Internal Calibration Results

-0.5-0.4-0.3-0.2-0.10.00.10.20.30.40.5

2/1/00

6/1/00

10/1/

002/1

/016/1

/01

10/1/

012/1

/026/1

/02

10/1/

022/1

/036/1

/03

10/1/

032/1

/046/1

/04

10/1/

042/1

/056/1

/05

Date

Sens

or R

espo

nse

Cha

nge,

Per

cent

SW-L1 SW-L2 SW-L3

Normalized to Start of Mission

FM2 In-Flight Internal Calibration Results

-0.5-0.4-0.3-0.2-0.10.00.10.20.30.40.5

2/1/00

6/1/00

10/1/

002/1

/016/1

/01

10/1/

012/1

/026/1

/02

10/1/

022/1

/036/1

/03

10/1/

032/1

/046/1

/04

10/1/

042/1

/056/1

/05

Date

Sens

or R

espo

nse

Cha

nge,

Per

cent

SW-L1 SW-L2 SW-L3

Normalized to Start of Mission

Page 11: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Spectral Degradation : SWICS vs. Earth Spectra

0 1 2 3 4Wavelength (micron)

0 1 2 3 4Wavelength (micron)

Spec

tral

Res

pons

e, N

orm

aliz

ed R

adia

nce

1.0

0.8

0.6

0.4

0.2

0.0

Page 12: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

LEO Missions Subject to Spectral DarkeningBandpasses of Selected Instruments

0

1

2

3

4

5

6

7

8

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Wavelength (Microns)

Ind

ex

Modis SeaWifs LandSat7 Toms SORCE-SIM SORCE SOLSTICE GOME

Page 13: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Spectral Darkening on Similar MissionsGlobal Ozone Monitoring Experiment (GOME) Spectral Darkening

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Wavelength/Radiometric Channel (um)

Rela

tive R

esp

on

se 1996

1997

1998

1999

2000

2001

Page 14: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science DirectoratePage 14

SD degradation (accumulated at a 6-monthperiod) as a function of wavelength

Faster degradation rate after fixing the SDdoor at “open position”

Yr 1

Yr 2Yr 3

Yr 4

Yr 5

Modis Solar Diffuser Spectral Degradation

Page 15: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Direct Comparison of Nadir Radiance Measurements

Two CERES instruments on a common platform allows for a uniquevalidation opportunity…..

Direct Comparison of simultaneous Nadir measurements

Each CERES/Terra instrument views nadir every 3.3 seconds

Thus, we obtain nearly simultaneous measurements of the same geo-location (Δt < 3.3 seconds)….

Spatial, angular, and temporal sampling issues are virtually eliminated.

26,000 co-located (but not independent) measurements in a given day,provides a very rigorous statistical tool.

Results can be discretized by scene type to enhance the analysis.

Page 16: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Terra Edition2 Nadir Direct Comparison

1.005

1.000

0.995

0.990

0.985

1.0151.0101.0051.0000.9950.9900.9850.980

Mar-00 Mar-01 Mar-02 Mar-03 Mar-04

All-Sky

FM1 in Xtrack

FM2 in Xtrack

All-SkyClear OceanSW2

f

SW1f

SW2f

SW1f

SW Nadir Radiances

Mar-00 Mar-01 Mar-02 Mar-03 Mar-04

FM1 in Xtrack

FM1 in RAPS

Page 17: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Terra Edition2 Nadir Direct Comparison

1.005

1.000

0.995

0.990

0.985

1.0151.0101.0051.0000.9950.9900.9850.980

Mar-00 Mar-01 Mar-02 Mar-03 Mar-04

All-Sky

FM1 in XTRACK

FM1 in RAPS

All-SkyClear OceanSW2

f

SW1f

SW2f

SW1f

SW Nadir Radiances

FM1 in Xtrack

FM1 in RAPS

Page 18: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

RAPS

Whats the difference between RAPS and FAPS?

FAPS

Page 19: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

RAPS

Whats the difference between RAPS and FAPS?

FAPS

Ground Track

Scan Plane

Page 20: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

RAPS

Whats the difference between RAPS and FAPS?

FAPS

Page 21: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

RAPS

Whats the difference between RAPS and FAPS?

FAPS

Page 22: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Terra Edition2 Nadir Direct Comparison

1.005

1.000

0.995

0.990

0.985

1.0151.0101.0051.0000.9950.9900.9850.980

Mar-00 Mar-01 Mar-02 Mar-03 Mar-04

All-Sky

FM1 in XTRACK

FM1 in RAPS

All-SkyClear OceanSW2

f

SW1f

SW2f

SW1f

SW Nadir Radiances

FM1 in Xtrack

FM1 in RAPS

Page 23: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Edition2_Rev1 Scaling Factors

1.00

1.01

1.02

1.03

Mar-00 Mar-01 Mar-02 Mar-03 Mar-04 Mar-05

All Sky Clear Ocean

1.00

1.01

1.02

1.03

Mar-00 Mar-01 Mar-02 Mar-03 Mar-04 Mar-05

All Sky Clear Ocean

1.00

1.01

1.02

1.03

Jul-02 Jan-03 Jul-03 Jan-04 Jul-04 Jan-05

All Sky Clear Ocean

1.00

1.01

1.02

1.03

Jul-02 Jan-03 Jul-03 Jan-04 Jul-04 Jan-05

All Sky Clear Ocean

Terra - FM1

Terra - FM2

Aqua - FM3

Aqua - FM4

Page 24: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

A table of Edition2_Rev1 monthly scaling factors is providedvia the CERES Data Quality Summaries…

Edition2_Rev1 SW Scaling Factors

Page 25: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Application of Edition2_Rev1 Scaling Factors

Page 26: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Application of Edition2_Rev1 Scaling Factors

30S - 30N

90S - 90N

Deseasonalized monthly anomalies in Terra FM1 and Aqua FM4 all-sky SW TOA Flux

_Rev1_Rev1

Page 27: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Edition2_Rev1 Key Assumptions

The Rev1 algorithm requires two key assumptions:

1. That the Xtrack instrument is radiometrically stable

2. The SWICS lamps provide a radiometrically stablecalibration source.

Page 28: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Operations to Characterize Spectral Darkening

EliminatedEliminatedNoXtrackNoXtrackApril

EliminatedEliminatedNoXtrackNoXtrackMarch

EliminatedEliminatedNoXtrackNoStowedFebruary

EliminatedEliminatedNoXtrackNoStowedJanuary

EliminatedEliminatedNoXtrackNoXtrackDecember

EliminatedEliminatedNoXtrackNoXtrackNovember

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

FM1 SolarCalibrations

No

No

No

No

No

Yes

Yes

Daily

Yes

FM2 SolarCalibrations

Xtrack

Xtrack

Xtrack

Xtrack3,5

Xtrack3

Xtrack

Xtrack

Xtrack

Xtrack

FM1 AzimuthGimbal

Notes:1. Short-Earth scan profile turn-around reduced 8 degrees on March 31, 2005 to both FM1 and FM2.2. Expanded solar-avoidance region criteria May 13, 2005.3. Greenland Summer Solstice Terra-Aqua Inter-Calibration, June 6- July 6, 20054. GERB Operations, June 9-30, 2005.5. Nighttime internal calibrations, July 1-7, 2005.6. Valencia Over-Flights, September 12-17, 2005.

EliminatedEliminatedXtrackOctober

EliminatedEliminatedXtrack6September

--StowedAugust

--StowedJuly

EliminatedEliminatedXtrack4June

DarkeningRate Impact

FM2 RAMDirection

FM2 SolarExposure

FM2 AzimuthGimbal

Month(2005)

NominalNominalNominalXtrack, AtrackFebruary

Reduced2Eliminated2Rotating, AtrackMay

No ChangeNominalReduced1RotatingApril

No ChangeAcceleratedAcceleratedXtrackMarch

Page 29: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

-1.28

-1.26

-1.24

-1.22

-1.20

-1.18

-1.16

-1.146/1/05

6/29/05

7/27/05

8/24/05

9/21/05

10/19/05

11/16/05

12/14/05

1/11/06

2/8/06

3/8/06

4/5/06

Date

100*(FM2-FM1)/FM1

Terra Pre and Post Stow SW Direct Compare

Terra Edition1 All-Sky Daily Direct Compare

FM2 FM1Xtrack Stow Xtrack Stow Xtrack

Page 30: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Onboard SW Calibration Philosophy

PRT PRT SUN Monitor Diode

ICSBB MAM SWICS

WindowSensor

TotalSensor

ShortwaveSensor

Field-of-ViewCoalignment

Traceability

Sources

RadiometricChannel

ValidationStudies

Page 31: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

MAM’s, SWICS, and DCC’s

Page 32: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Onboard SW Calibration EquipmentShortwave Internal Calibration Source (SWICS)

• Quartz-halogen tungsten lamp (2100, 1900, 1700 K spectrums)

• SiPd independently monitors lamp output

• Design specification is +-0.5% stability over 5-year mission

• Designed primarily to transfer Ground Calibrationmeasurements into orbit

Mirror Attenuator Mosaic (MAM)

• Solar Diffuser plate attenuates direct solar view (~5800KSpectrum)

• MAM is a Nickel substrate with Aluminum coated sphericalcavities or divots

• Provides a Relative calibration of the Shortwave channel andthe SW portion of the Total channel

• Designed to provide a long-term on-orbit SW calibration source.

• Solar Cal results to date are suspect due to large initial drift inMAM surface reflectances…

Page 33: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Solar Calibration Results

-2

-1

0

1

2

3

4

5

6

7

May-02 Nov-02 May-03 Nov-03 May-04 Nov-04Date

Sens

or R

espo

nse,

Per

cent

age

Cha

nge

FM3 SW FM3 TOT

-2

-1

0

1

2

3

4

5

6

7

May-02 Nov-02 May-03 Nov-03 May-04 Nov-04Date

Sens

or R

espo

nse,

Per

cent

age

Cha

nge

FM4 SW FM4 TOT

-2

-1

0

1

2

3

4

5

6

7

Feb-00 Aug-00 Feb-01 Aug-01 Feb-02 Aug-02 Feb-03 Aug-03 Feb-04 Aug-04Date

Sens

or R

espo

nse,

Per

cent

age

Cha

nge

FM1 SW FM1 TOT

-2

-1

0

1

2

3

4

5

6

7

Feb-00 Aug-00 Feb-01 Aug-01 Feb-02 Aug-02 Feb-03 Aug-03 Feb-04 Aug-04Date

Sens

or R

espo

nse,

Per

cent

age

Cha

nge

FM2 SW FM2 TOT

Page 34: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES TRMM/PFM Internal Calibration Results

Page 35: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Onboard SW Calibration Philosophy

PRT PRT SUN Monitor Diode

ICSBB MAM SWICS

WindowSensor

TotalSensor

ShortwaveSensor

Field-of-ViewCoalignment

Traceability

Sources

RadiometricChannel

ValidationStudies

Page 36: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Onboard SW Calibration Philosophy

PRT PRT SUN Monitor Diode

ICSBB DCC SWICS

WindowSensor

TotalSensor

ShortwaveSensor

Field-of-ViewCoalignment

Traceability

Sources

RadiometricChannel

ValidationStudies

Page 37: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

0

0.2

0.4

0.6

0.8

Jul-0

2Aug

-02

Sep-

02Oct

-02

Nov-0

2Dec

-02

Jan-

03Fe

b-03

Mar

-03

Apr-0

3May

-03

Jun-

03Ju

l-03

Aug-0

3Se

p-03

Oct-0

3Nov

-03

Dec-0

3Ja

n-04

Feb-

04Mar

-04

Apr-0

4May

-04

Jun-

04Ju

l-04

Aug-0

4Se

p-04

Oct-0

4Nov

-04

Dec-0

4Ja

n-05

Feb-

05Mar

-05

Date

Sen

sor

Resp

on

se

Ch

an

ge,

Perc

en

t

DCC Level 1 Level 2 Level 3

Aqua SW Internal and DCC Calibration Results

0

0.2

0.4

0.6

0.8

Jul-0

2Aug

-02

Sep-

02Oct

-02

Nov-0

2Dec

-02

Jan-

03Fe

b-03

Mar

-03

Apr-0

3May

-03

Jun-

03Ju

l-03

Aug-0

3Se

p-03

Oct-0

3Nov

-03

Dec-0

3Ja

n-04

Feb-

04Mar

-04

Apr-0

4May

-04

Jun-

04Ju

l-04

Aug-0

4Se

p-04

Oct-0

4Nov

-04

Dec-0

4Ja

n-05

Feb-

05Mar

-05

Date

Sen

sor

Resp

on

se

Ch

an

ge,

Perc

en

t

DCC Level 1 Level 2

Normalized to Initial Flight Calibrations

FM3

FM4

Normalized to Initial Flight Calibrations

Page 38: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Back-Up Material

Page 39: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

New Operational Constraints

Page 40: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES ES-8 Edition2_Rev1 Summary

•Cal/Val Protocol demonstrates radiometric stability of the data products through 12/2005 of….

Note: Values apply to all-sky global averages Units are in %/yr

.1.1<.1<.1.1.1<.1<.1.1.1<.1<.1WN

.25.25<.1<.1.4.3.3.2.5.4.4.2SW

.1.1<.1<.1.1.1<.1<.1.125.125.125.1LWnight

.15.15.125.125.3.3.125.125.4.4.6.3LWday

FM4FM3FM2FM1FM4FM3FM2FM1FM4FM3FM2FM1

Edition2_Rev1Edition2Edition1

Page 41: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES BDS and ERBE-Like Product Status

6/02 - 12/05YesEdition2

6/02 - 12/05YesEdition2

1/98 - 8/98 , 3/00YesEdition2

1/98 - 8/98 , 3/00YesEdition1BDSTRMM

1/98 - 8/98 , 3/00YesEdition1ERBE-Like

6/02 - present

6/02 - present

2/00 - 12/05

2/00 - present

2/00 - 12/05

2/00 - present

Months ProcessedAvailableVersionProductSpacecraft

YesEdition1ERBE-like

YesEdition1BDSAqua

YesEdition2

YesEdition1ERBE-like

YesEdition2

YesEdition1BDSTerra

Note: Red text indicates months are in final validation prior to public release.

Page 42: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Pre and Post FM2 Stow SW Direct Compare

Terra Edition1 All-Sky Daily Direct Compare

Xtrack Stow Xtrack

Page 43: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Spectral Darkening on Similar Missions

Spare NIMBUS ERB Radiometer flown on LDEFMeasured Transmittance Change of Suprasil W

4mm sample, 5 yr. exposure

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Wavelength (Microns)

Rati

o t

o W

itn

ess

Sam

ple

Page 44: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

Instrument Artifact Removal StrategyRemote sensing instruments generally exhibit time varying artifacts in their

data products. For CERES these artifacts stem from either of 2 physicalentities…..

• Radiometric Gain Change- Wavelength independent change in sensor responsivity- Corrections implemented in Count Conversion algorithm (SS1)

• Spectral Response Change- Wavelength dependent change in sensor optics- Corrections implemented in Spectral Unfiltering algorithms (SS2)

The Edition2 production strategy assumes that spectral response changes are ‘Gray’over broad spectral regions. In other words, we assume uniform spectral responsechanges in these broad regions.

Spectral Region

8-12 um-WN-<5.0 umSW

>3.0 um<3.0 umTotalLWSW

RadiometricChannel

Page 45: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

FM2 In-Flight Internal Calibration Results

-2.0-1.5-1.0-0.50.00.51.01.52.02.53.0

2/1/00

6/1/00

10/1/

002/1

/016/1

/01

10/1/

012/1

/026/1

/02

10/1/

022/1

/036/1

/03

10/1/

032/1

/046/1

/04

10/1/

042/1

/056/1

/05

Date

Sens

or R

espo

nse

Cha

nge,

Per

cent

TOTAL WN SW-L2 SW-L1 SW-L3

Normalized to Ground Calibration Data

CERES Internal Calibration Results

FM1 In-Flight Internal Calibration Results

-2.0-1.5-1.0-0.50.00.51.01.52.02.53.0

2/1/00

6/1/00

10/1/

002/1

/016/1

/01

10/1/

012/1

/026/1

/02

10/1/

022/1

/036/1

/03

10/1/

032/1

/046/1

/04

10/1/

042/1

/056/1

/05

Date

Sens

or R

espo

nse

Cha

nge,

Per

cent

TOTAL WN SW-L2 SW-L1 SW-L3

Normalized to Ground Calibration Data

FM4 In-Flight Internal Calibration Results

-5-4-3-2-1012345

6/1/02

8/1/02

10/1/

02

12/1/

022/1

/034/1

/036/1

/038/1

/03

10/1/

03

12/1/

032/1

/044/1

/046/1

/048/1

/04

10/1/

04

12/1/

042/1

/054/1

/056/1

/05

Date

Sen

sor R

espo

nse

Cha

nge,

Per

cent

TOTAL WN SW-L2 SW-L1

Normalized to Ground Calibration Data

FM3 In-Flight Internal Calibration Results

-5-4-3-2-1012345

6/1/02

8/1/02

10/1/

02

12/1/

022/1

/034/1

/036/1

/038/1

/03

10/1/

03

12/1/

032/1

/044/1

/046/1

/048/1

/04

10/1/

04

12/1/

042/1

/054/1

/056/1

/05

Date

Sens

or R

espo

nse

Cha

nge,

Per

cent

TOTAL WN SW-L2 SW-L1 SW-L3

Normalized to Ground Calibration Data

Page 46: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES Gain/Spectral Change Summary

-

-

-

-

LW/TOT

.7

.5

.4

-

SW

TOA FluxAll-Sky(W/m^2)

1.6

1.6

3.6

1.1

LWDay

.75

1.1

1.0

.65

LWNight

FM4

FM3

FM2

FM1

1.2

1.4

2.6

.45

SW/TOT

-

-

-

-

WN

-

-

.40

-

SW

ChannelSpectral Response

(%)

ChannelGain(%)

.80-.30

--.35Terra

--.40

.50

SWWNTOTSpacecraft

-.45Aqua

1. All values are maximum on-orbit changes

2. Ground to flight shifts are accounted for separately

3. SW/TOT < 3.0 microns, LW/TOT > 3.0 microns

4. TOA Flux values are all-sky global averages

Cumulative changes incorporated in Edition 2 BDS and ERBE-Like products

Page 47: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES ES-8 Edition2_Rev1 Summary

•Cal/Val Protocol demonstrates radiometric stability of the data products through 12/2005 of….

Note: Values apply to all-sky global averages Units are in %/yr

.1.1<.1<.1.1.1<.1<.1.1.1<.1<.1WN

.25.25<.1<.1.4.3.3.2.5.4.4.2SW

.1.1<.1<.1.1.1<.1<.1.125.125.125.1LWnight

.15.15.125.125.3.3.125.125.4.4.6.3LWday

FM4FM3FM2FM1FM4FM3FM2FM1FM4FM3FM2FM1

Edition2_Rev1Edition2Edition1

Page 48: Terra/Aqua Instrument Calibration: SW Revision 1 · 2007-12-06 · Terra/Aqua Instrument Calibration: SW Revision 1 Kory J. Priestley Susan Thomas, Denise Cooper, Phil Hess, Grant

NASA Langley Research Center / Science Directorate

CERES ES-8 Edition2_Rev1 Summary

•Cal/Val Protocol demonstrates radiometric stability of the data products through 12/2005 of….

Note: Values apply to all-sky global averages Units are in %/yr

.1.1<.1<.1.1.1<.1<.1.1.1<.1<.1WN

.25.25<.1<.1.4.3.3.2.5.4.4.2SW

.1.1<.1<.1.1.1<.1<.1.125.125.125.1LWnight

.15.15.125.125.3.3.125.125.4.4.6.3LWday

FM4FM3FM2FM1FM4FM3FM2FM1FM4FM3FM2FM1

Edition2_Rev1Edition2Edition1