NAST-I: results from revolutionary aircraft sounding spectrometer

Smith, William L.; Larar, Allen M.; Zhou, Daniel K.; Sisko, C. A.; Li, Jun; Huang, Bormin; Howell, H. B.; Revercomb, Henry E.; Cousins, Daniel; Gazarik, Michael J.; Mooney, Dan; Mango, S.

doi:10.1117/12.366362

Cited by 32 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(9) The new physical inversion algorithm has been successfully applied to the NAST-I instrument, which is a Fourier Transform infrared spectrometer with a spectral resolution of 0.25 cm −1 and a continuous spectral coverage from 645 to 2700 cm −1 (Cousins and Smith, 1997;Smith et al, 1999Smith et al, , 2005. It would be very computationally intensive (or impractical) to include all 8632 NAST-I channels in a conventional physical inversion algorithm.…”

Section: Description Of a Physical Retrieval Algorithm Based On Pcrtmmentioning

confidence: 99%

Case-study of a principal-component-based radiative transfer forward model and retrieval algorithm using EAQUATE data

Liu

Zhou

Larar

et al. 2007

Q.J.R. Meteorol. Soc.

Self Cite

View full text Add to dashboard Cite

ABSTRACT:The objective of the paper is to apply a novel radiative transfer model and a physical retrieval algorithm to hyperspectral data taken during the European Aqua Atmospheric Thermodynamics Experiment (EAQUATE) campaign. A principal-component-based radiative transfer model (PCRTM) is used to calculate projection coefficients of the radiance spectrum onto a set of predefined empirical orthogonal functions (EOFs) and associated derivatives with respect to the state vector. Instead of fitting channel radiances, the physical retrieval algorithm iteratively fits the principal component (PC) scores or the EOF projection coefficients of the observed radiance spectrum using the PCRTM as its forward model. Since the EOFs are orthonormal to each other, only a few PC scores are needed to capture the information content of the radiance spectrum, therefore reducing the computational time needed for running both the forward model and the inversion. This paper demonstrates the application of such a physical algorithm for retrieving atmospheric temperature, moisture and ozone profiles, and surface properties such as surface skin temperature and surface emissivity. The results have been compared with those obtained with a NAST-I channel-based physical retrieval algorithm and with those obtained from collocated radiosonde and LIDAR measurements.

show abstract

Section: Description Of a Physical Retrieval Algorithm Based On Pcrtmmentioning

confidence: 99%

Case-study of a principal-component-based radiative transfer forward model and retrieval algorithm using EAQUATE data

Liu

Zhou

Larar

et al. 2007

Q.J.R. Meteorol. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…These instruments provide experimental observations needed for finalizing specifications, testing proposed designs, and developing data-processing algorithms for the Cross-track Infrared Sounder (CrIS), which will fly on NPOESS satellites. Detailed descriptions of NAST-I instrumentation, data processing methodologies, and data products can be found elsewhere (Cousins and Smith, 1997;Smith et al, 1999;Larar et al, 2002;Zhou et al, 2002;Smith et al, 2005a). Selected AIRS radiance datasets have been put through testing using the NAST-Team retrieval algorithm since AIRS data first became available in July 2002 (Smith et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Retrieval validation during the European Aqua Thermodynamic Experiment

Zhou

Smith

Cuomo

et al. 2007

Q.J.R. Meteorol. Soc.

Self Cite

View full text Add to dashboard Cite

Atmospheric and surface thermodynamic parameters retrieved with advanced hyperspectral remote sensors aboard Earth observing satellites are critical to weather prediction and scientific research. The retrieval algorithms and retrieved parameters from satellite sounders must be validated to demonstrate the capability and accuracy of both observation and data processing systems. The European Aqua Thermodynamic Experiment (EAQUATE) was conducted not only for validation of the Atmospheric InfraRed Sounder on the Aqua satellite, but also for assessment of validation systems of both ground-based and aircraft-based instruments that will be used for other satellite systems, such as the Infrared Atmospheric Sounding Interferometer on the European MetOp satellite, the Cross-track Infrared Sounder from the National Polar-orbiting Operational Environmental Satellite System (NPOESS) Preparatory Project and the continuing series of NPOESS satellites. Detailed intercomparisons were conducted and presented using different retrieval methodologies: measurements from airborne ultraspectral Fourier transform spectrometers, aircraft in situ instruments, dedicated dropsondes and radiosondes, ground-based Raman lidar, as well as the European Centre for Medium-range Weather Forecasting modelled thermal structures. The results of this study not only illustrate the quality of the measurements and retrieval products, but also demonstrate the capability of the validation systems put in place to validate current and future hyperspectral sounding instruments and their scientific products.

show abstract

“…8 -11 The National Polar-Orbiting Operational Environmental Satellite System (NPOESS) Airborne Sounder TestbedInterferometer (NAST-I) has been successfully operating on high-altitude aircraft (i.e., ER-2 and Proteus) since 1998. [12][13][14][15] The NAST-I provides high spatial linear resolution, equal to 13% of the aircraft's altitude at nadir, scanning, and high spectral resolution ͑0.25-cm Ϫ1 ͒ measurements within the spectral region 645-2700 cm Ϫ1 from the NASA ER-2 or the Northrop Grumman Proteus aircraft flown at an altitude 15-20 km. The NAST-I is designed to support the development of future satellite temperature and moisture sounders such as the Infrared Atmospheric Sounding Interferometer (IASI) on the METOP satellite (to be launched in 2006), the CrossTrack Infrared Sounder (CrIS) on the NPOESS Preparatory Project (NPP) (in 2006) and NPOESS (in 2008NPOESS (in -2010 satellites, and the Geostationary Imaging Fourier Transform Spectrometer (GIFTS) and the Hyperspectral Environmental Suite (HES) to fly on geostationary satellites (in approximately 2013).…”

Section: Introductionmentioning

confidence: 99%

Tropospheric CO observed with the NAST-I retrieval methodology, analyses, and first results

Zhou¹,

Smith

Liu³

et al. 2005

Appl. Opt.

Self Cite

View full text Add to dashboard Cite

High-resolution infrared spectra from aircraft and space-based observations contain information about tropospheric carbon monoxide (CO) as well as other trace species. A methodology for retrieving tropospheric CO from such remotely sensed spectral data has been developed for the National Polar-Orbiting Operational Environmental Satellite System's Airborne Sounder Testbed-Interferometer (NAST-I). CO profiles of the troposphere, together with its thermodynamic properties, are determined by use of a three-stage retrieval approach that combines the algorithms of physically based statistical eigenvector regression, simultaneous and iterative matrix inversion, and single-variable error-minimization CO profile matrix inverse retrieval. The NAST-I is collecting data while it is aboard high-altitude aircraft throughout many field campaigns. Detailed retrieval analyses based on the NAST-I instrument system along with retrieval results from several recent field campaigns are presented to demonstrate NAST-I CO retrieval capability.

show abstract

NAST-I: results from revolutionary aircraft sounding spectrometer

Cited by 32 publications

References 0 publications

Case-study of a principal-component-based radiative transfer forward model and retrieval algorithm using EAQUATE data

Case-study of a principal-component-based radiative transfer forward model and retrieval algorithm using EAQUATE data

Retrieval validation during the European Aqua Thermodynamic Experiment

Tropospheric CO observed with the NAST-I retrieval methodology, analyses, and first results

Contact Info

Product

Resources

About