10 th gsics exp meeting, june 6-8 2011, geneva noaa gprc report to the gsics 10 th exp 6-8 june...
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![Page 1: 10 th GSICS EXP Meeting, June 6-8 2011, Geneva NOAA GPRC Report to the GSICS 10 th EXP 6-8 June 2011, Geneva, Switzerland](https://reader033.vdocuments.mx/reader033/viewer/2022051515/551543f655034685568b4fca/html5/thumbnails/1.jpg)
10th GSICS EXP Meeting, June 6-8 2011, Geneva
NOAA GPRC Report to the GSICS 10th EXP
6-8 June 2011, Geneva, Switzerland
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Operation Status » GEO-LEO Imager Infrared inter-calibration
New products» GOES sounder GEO-LEO inter-calibration» AVHRR vs. MODIS inter-calibration for the solar reflectance channels» MSU/AMSU» Bias monitoring Web
Emerging Capacity» GEO-GEO inter-calibration for GOES Imager and Sounder
Examples of Application» GOES-14/15 PLT» Evaluation of MBCC and Scan Mirror Emissivity» Stray Light
GEO Visible Channel Inter-Calibration
Outline
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Operation Status
GEO Imager vs. AIRS/IASI» Baseline algorithm» GOES vs. AIRS: Jan. 2007 -> current» GOES vs. IASI: Jun 2007 -> current» Other GEO vs. AIRS/IASI: Aug 2008 - > current» Back-processing with baseline algorithm is being conducted at
Univ. of Wisconsin.
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10th GSICS EXP Meeting, June 6-8 2011, Geneva 4
Product Monitoring Reveals calibration anomalies, seasonal and
long-term variations
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Recursive Filtering Removes the Outliers
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Regression with weighting of FOV_STDV Recursive removal of outliers
Stray-light?
Extreme homo scenes
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
New Products
New Products» GOES Sounder GEO-LEO inter-calibration» AVHRR vs. MODIS inter-calibration for the solar reflectance
channels» MSU/AMSU
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
GOES Sounder Correction
• GSICS GEO-LEO Operational Correction for GOES Sounder• Near real-time of daily correction• Re-analysis• Data available at NOAA GSICS server
http://gsics.nesdis.noaa.gov:8080/thredds/catalog.html
• Bias monitoring available athttps://gsics.nesdis.noaa.gov/wiki/GPRC/GeoLeo
Spatial distribution of GOES-11 Sounder vs. IASI collocation
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Re-analysis correction products for AVHRR
Provided the ATBD and the re-analysis correction for the AVHRR solar reflectance channels
• Inter-calibration with MODIS data
• From TIROS-N to NOAA-19
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By A. Heidinger and his crew
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
GEO-LEO Inter-Calibration Products
Products download server:» http://gsics.nesdis.noaa.gov:8080/thredds/catalog.html» Near Real-time Correction – update everyday» Re-analysis Correction – updated once per month
New product monitoring wiki-website:» https://gsics.nesdis.noaa.gov/wiki/GPRC/WebHome
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
LEO-LEO inter-calibration for Microwave Sounding
http://www.star.nesdis.noaa.gov/smcd/emb/mscat/mscatmain.htm
Products:» Level-1B calibration coefficients» Corrected Level-1C radiance
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By C. Zou and his crew
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Emerging Capacity:GEO-GEO Inter-Calibration
GEO-GEO inter-calibration for GOES Imager/Sounder» GOES 15 vs. GOES-13 » GOES-11 vs. GOES-13
Regular inter-calibration frequency and location » Imager: twice/hour » Sounder: once/hour
Direct inter-comparison may exaggerate calibration anomaly» MBCC (different phase angle) » Spectral response function uncertainty
Opportunity to verify the GSICS GEO-LEO correction results
GEO-GEO Spatial distribution
Imager (G15 vs. G13) Sounder (G15 vs. G13)
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
GEO-GEO Inter-Calibration
Latitudinal Tb bias (GOES15-GOES-13)Diurnal Tb bias (GOES15-GOES-13)
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
GOES-14/15 PLTImager Ch3 & Ch 6 SRF
Large Tb biases was observed at GOES-14/15 Imager water vapor channels during the PLT test periods
» 0.99 K (±0.11) for GOES14 and 2.12K(±0.11) for GOES15
Instrument vendor re-analyzed the pre-flight data and provided a new version of SRF (RevG)
» GOES Instrument performance monitoring data and the GSICS GEO-LEO collocation data used to evaluate the RevG SRF.
» RevG improves the accuracy– GOES14: 0.99K to 0.97K– GOES15: 2.12K to 0.73K
» NOAA is going to continue to shift the RevG SRF. The preliminary results:
– GOES-14 Ch3: -8.25µm– GOES-15 Ch3: -5.75µm– GOES-15 Ch6: + 0.5µm
Time-series of Tb bias to AIRS/IASI for GOES-14 Ch3 (left) and GOES-15 Ch3 (right)
Tb bias to IASI with RevE SRF (black) and RevG SRF (red). Left: GOES-14, right: GOES-15
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Mid-nigh Blackbody Calibration Correction (MBCC)
• Use of the GSICS GEO-LEO collocation data and the GOES IPM data to assess the GOES midnight blackbody calibration correction (MBCC) calibration accuracy.
• MBCC, if turned on, works efficiently to reduce the diurnal calibration variations for most GOES Imager IR channels except for Ch4 (10.7µm).
• GOES-11/12 Imager has no significant scan-angle dependent calibration residual
• Paper is ready to be submitted to IEEE on Geosciences and Remote Sensing. Diurnal cal. Variation of GOES-11 Imager.
Channel name
GOES11 - AIRS GOES12 -AIRSWinter Summer Winter Summer
Ch3 0.12 0.13 - -Ch4 - 0.49 - 0.48Ch5 0.13 -Ch6 0.04 -0.11
Mean Tb bias to AIRS around satellite midnight time with MBCC correction (MBCC onset frequency larger than 80%)
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Angular Dependence of Scan Mirror Emissivity
Little scan-angle dependence of Tb bias for GOES-11
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Stray Light
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Figure 6a: Orbit mean brightness temperature differences between GOES-11 and LEO versus GOES-11 local time (a) for channel 2 (3.9microns), (b) for channel 3 (6.7 microns), (c) for channel 4 (11 microns) and (d) for channel 5 (12 microns). The red color indicates thatdifferences are with respect to IASI and black color indicates that differences are with respect to AIRS. Zero on x-axis indicates GOES-11 localmidnight.
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Stray Light
G11 Ch2 G11 Ch3 G11 Ch4 G11 Ch5
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
GEO Visible Channel Inter-Calibration
Progresses in GOES visible calibration» Desert – Collected more data– Plan to characterize the sites with air borne instruments (AVIRIS etc.)– Implement the spatial variance threshold (D. Doelling).
» MODIS– Embedded the calibration coefficients at Level1B data since after July 2010
» DCC– Target characterization with GOME data
» Lunar
» Star18
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
GOES vs. GOME-2 Inter-calibration
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Use of Hyperspectral Data (GOME) to characterize the Impact of SRF difference, and guide the selection of DCC target
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10th GSICS EXP Meeting, June 6-8 2011, Geneva 20
All Vicarious Calibrations
Five Vicarious Calibration Methods for GOES-10 Imager
0.6000
0.7000
0.8000
0.9000
1.0000
1.1000
1.2000
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
Time (Year)
No
mal
ized
Deg
rad
atio
n
Desert MODIS Moon DCC Star M2
DCC is monthly average so it should look better
Desert has the worst seasonal variation, however star and DCC may have it, too.
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Star Calibration
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Un-normalized Star Observations
Normalized and Outlier Filtered Star Observations
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Sun-Glint Calibration – Band to Band Inter-calibration
• Mean difference is roughly 5%• This magnitude of difference is no larger than
spread seen in various AVHRR 0.65 m calibrations.• Obvious seasonality in the results – atmospheric
correction?
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3.9 m Reflectance 0.65 m Counts
Comparison to NESDIS Operational Calibration Slopes
Relationship between 3.9 m Reflectance and 0.65 m Reflectance
By A. Heidinger and his crew
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Conclusions
GEO-LEO inter-calibration» NOAA GPRC continues the non-stop routinely monitoring of the operational GEO satellites
» Almost complete the back-process of GOES-10 vs. AIRS inter-calibration
New GSICS correction Products» GEO-LEO: GOES Sounder GEO-LEO inter-calibration (Near real-time and re-analysis
corrections)
» LEO-LEO: AVHRR solar reflectance channels
New applications» GOES GEO-GEO inter-calibration
» Evaluate the new version of SRF before implementation on the satellites
» GOES Imager diurnal and scan-angle calibration evaluation
Recursive filtering can effectively remove the outliers – recommend for operational regression
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10th GSICS EXP Meeting, June 6-8 2011, Geneva
Conclusions
GOME-2 data can be used as guidance to select target in inter-calibration with MODIS.
The preliminary result of the sun-glint calibration is promising.
Use star to experience various synergetic methods of using vicarious calibration results.
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