IASI Principle Component Analysis, IASI and AIRS Regression - - PowerPoint PPT Presentation

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IASI Principle Component Analysis, IASI and AIRS Regression - - PowerPoint PPT Presentation

Feb 11, 2024 185 likes •700 views

IASI Principle Component Analysis, IASI and AIRS Regression Retrieval Comparisons and Update on Radiance Climatology Dataset Mitchell D. Goldberg Zhaohui Cheng Lihang Zhou Chris Barnet NOAA/NESDIS AIRS Science Team October 9, 2007 IASI PCA

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IASI Principle Component Analysis, IASI and AIRS Regression Retrieval Comparisons and Update on Radiance Climatology Dataset

Mitchell D. Goldberg Zhaohui Cheng Lihang Zhou Chris Barnet NOAA/NESDIS AIRS Science Team October 9, 2007

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IASI PCA Motivation

  • IASI PCA Regression
  • Data Compression
  • Noise Estimation
  • Detection of Anomalies
  • Assimilation of Reconstructed Radiances
  • Assimilation of PCs
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Spectral Coverage of Thermal Sounders (Example BT’s for AIRS, IASI, & CrIS)

AIRS, 2378 Channels CrIS 1305 IASI, 8461 Channels CO2 CO2 O3 CO CH4

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Instrument Noise, NEΔT at 250 K (Interferometers Noise Is Apodized)

CO2 CO2 CH4 CO

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Generation of EOFs

  • 3 bands together
  • Separate Bands

– 645- 1210 cm-1 – 1210 – 2000 – 2000 - 2760

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IASI and AIRS Regression Temperature Retrieval Accuracy

Independent dataset (ocean only)

IASI AIRS

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IASI and AIRS Regression Moisture Retrieval Accuracy

Independent dataset (ocean only)

IASI AIRS

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IASI AIRS

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AIRS Regression Retrieval― Temperature Profile (opr coef vs exp)

Independent dataset (ocean only)

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AIRS Regression Retrieval― Temperature Profile (opr vs exp)

Independent dataset (ocean only)

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Generation of AIRS Radiance Dataset for Climate Studies

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Applications of Mapped Spectrally Resolved Radiances

  • Compare radiances

with simulated radiances from model analyses

  • Compare different

years to see how the

  • utgoing infrared

radiances have changed.

NCEP – ECMWF Above 500 mb H20

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Water – Upper Troposphere

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Radiance Climate Dataset detected jump in ECMWF moisture analysis after update to their adaptive bias tuning

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270 mb

Observed AIRS minus ECMWF Simulated AIRS for Upper Trop. Water Vapor 2003 2005 2004 AIRS assimilated operationally 2004 2004 2004 2004 2005 2004 AIRS assimilated operationally 2005 2004 2004 2004 2004 2004 2005 2004 AIRS assimilated operationally 2005 2004

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270 mb

Observed AIRS minus NCEP Simulated AIRS for Upper Trop. Water Vapor 2003 2004 2005 AIRS assimilated operationally

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520 mb

AIRS assimilated operationally 2005 2004

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520 mb

AIRS assimilated operationally

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Consistent with Sept 03,04,05 270 mb

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GDAS consistent with Sept 05 270 mb

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520 mb Consistent with Sept 03,04,05

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Summary

  • Continue IASI PCA research
  • Compare IASI and AIRS retrievals
  • Complete 2003-2007 AIRS radiance

climate dataset.

  • Begin generating IASI radiance climate

dataset.

  • IASI level 2 product will be operational at

NESDIS in June 2008

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Summary

  • IASI and AIRS are critical for satellite

intercalibration/characterization of other key observing systems (e.g International Geostationary satellites)

  • New WMO Global Space-based

Intercalibration System (GSICS) led by NESDIS

  • Establish stability of IASI using AIRS
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Organizations contributing to GSICS

  • NOAA
  • NIST
  • NASA
  • EUMETSAT
  • CNES
  • CMA
  • JMA
  • KMA

GSICS current focus is on the intercalibration of operational satellites, and makes use of key research instruments such as AIRS and MODIS to intercalibration the operational instruments