Assessment of the Hyperspectral Infrared Atmospheric Sounder (HIRAS)

The hyperspectral infrared atmospheric sounder (HIRAS), the first Chinese hyperspectral infrared instrument, was launched in 2017 on board the fourth polar orbiter of the Feng Yun 3 series, FY-3D. The instrument is a Fourier transform spectrometer with 2275 channels covering three spectral bands (65...

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Bibliographic Details
Published in:Remote sensing (Basel, Switzerland) Switzerland), 2019-12, Vol.11 (24), p.2950
Main Authors: Carminati, Fabien, Xiao, Xianjun, Lu, Qifeng, Atkinson, Nigel, Hocking, James
Format: Article
Language:English
Subjects:
Calibration
Channels
Contamination
Data assimilation
Field of view
Fourier analysis
Fourier transform spectrometers
Fourier transforms
Humidity
Infrared analysis
Infrared instruments
Meteorological satellites
Numerical prediction
Numerical weather forecasting
Quality assessment
Quality control
Software packages
Spectra
Spectral bands
Spectral resolution
Standard deviation
Trace gases
Weather forecasting
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Summary:The hyperspectral infrared atmospheric sounder (HIRAS), the first Chinese hyperspectral infrared instrument, was launched in 2017 on board the fourth polar orbiter of the Feng Yun 3 series, FY-3D. The instrument is a Fourier transform spectrometer with 2275 channels covering three spectral bands (650–1136, 1210–1750, and 2155–2550 cm−1) with 0.625 cm−1 spectral resolution. The first data quality assessment of HIRAS observations at full and normal spectral resolutions is presented. Comparisons with short-range forecasts from the Met Office numerical weather prediction (NWP) global system have revealed biases (standard deviation) generally less than 2.6 K (2 K) in the spectral regions mostly unaffected by trace gases where the confidence in the NWP model is largest. Of particular concern, HIRAS detector 3 seems to suffer from sunlight contamination of its calibration towards the end of the descending node. This, together with an obstruction of the detector field of view by an element of the platform, results in accentuated bias and noise in the observations from this detector. At normal spectral resolution, a background departure double difference analysis has been conducted between HIRAS and the NOAA-20 crosstrack infrared sounder (CrIS). The results show that HIRAS and CrIS are in good agreement with a mean difference across the three bands of −0.05 K (±0.26 K at 1σ) and 75.2% of the channels within CrIS radiometric uncertainty, noting though that HIRAS is noisier than CrIS with, on average, a standard deviation 0.34 K larger.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs11242950