Development and evaluation of the interferometric monitor for greenhouse gases: a high-throughput Fourier-transform infrared radiometer for nadir Earth observation

Kobayashi, H.; Shimota, Akiro; Kondo, Kayoko; Okumura, Eisuke; Kameda, Y.; Shimoda, Haruhisa; Ogawa, T.

doi:10.1364/ao.38.006801

Cited by 60 publications

(43 citation statements)

References 8 publications

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“…Correspondence to: C. Frankenberg (cfranken@iup.uni-heidelberg.de) shuttles in 1981, 1984(Reichle Jr. et al, 1999 and by the Interferometric Monitor for Greenhouse gases (IMG) onboard ADEOS from August 1996 to June 1997 (Kobayashi et al, 1999). MOPITT onboard EOS-TERRA since 1999 (Deeter et al, 2003) is still in orbit measuring global CO abundances using the gas correlation technique in the thermal infrared.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of CO from SCIAMACHY onboard ENVISAT: detection of strongly polluted areas and seasonal patterns in global CO abundances

2005

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Abstract. SCIAMACHY onboard the European environmental research satellite ENVISAT is an UV/visible/nearinfrared spectrometer providing 3 near infrared channels covering wavelengths from 1-1.75 µm, 1.94-2.04 µm and 2.26-2.38 µm with moderate spectral resolution (0.22-1.5 nm). From their structured absorption in these spectral regions, we can quantitatively determine the total column densities of the greenhouse gases CO 2 , CH 4 , N 2 O and H 2 O as well as of CO. A modified DOAS algorithm based on optimal estimation (IMAP-DOAS) has been developed at the University of Heidelberg to account for the peculiarities of these absorbers. CO is a relatively weak absorber whose spectral signature is overlapped by strong CH 4 and H 2 O absorptions. Hence, retrieval of CO from SCIAMACHY spectra (within 2.26-2.38 µm) is a challenging task. Therefore, the calibration of the raw spectra with respect to dark current issues and nonlinearity were analysed in detail and substantially improved to enable reasonable retrieval of CO. This paper focusses on first results of the CO retrieval where various sources like biomass burning events and their seasonal variability can be clearly identified.

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Section: Introductionmentioning

confidence: 99%

Retrieval of CO from SCIAMACHY onboard ENVISAT: detection of strongly polluted areas and seasonal patterns in global CO abundances

2005

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“…The first global maps of CH 4 columns have been retrieved from IMG/ADEOS thermal infrared (TIR) nadir spectra (Kobayashi et al, 1999). The results show qualitatively the expected variability, for example the NorthSouth hemispheric gradient .…”

Section: Introductionmentioning

confidence: 83%

Validation of ENVISAT/SCIAMACHY columnar methane by solar FTIR spectrometry at the Ground-Truthing Station Zugspitze

et al. 2005

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Abstract. Methane total-vertical column retrievals from ground-based solar FTIR measurements at the Permanent Ground-Truthing Station Zugspitze (47.42 • N, 10.98 • E, 2964 m a.s.l.), Germany are used to validate column averaged methane retrieved from ENVISAT/SCIAMACHY spectra by WFM-DOAS (WFMD) version 0.4 and 0.41 for 153 days in 2003. Smoothing errors are estimated to be below 0.10% for FTIR and 0.14% for SCIAMACHY-WFMD retrievals and can be neglected for the assessment of observed bias and day-to-day-scatter. In order to minimize the altitude-difference effect, dry-air column averaged mixing ratios (XCH 4 ) have been utilized. From the FTIRtime series of XCH 4 an atmospheric day-to-day variability of 1% was found, and a sinusoidal annual cycle with a ≈1.6% amplitude. To obtain the WFMD bias, a polynomial fitted to the FTIR series was used as a reference. The result is WFMD v0.4/FTIR=1.008±0.019 and WFMD v0.41/FTIR=1.058±0.008. WFMD v0.41 was significantly improved by a time-dependent bias correction. It can still not capture the natural day-to-day variability, i.e., the standard deviation calculated from the daily-mean values is 2.4% using averages within a 2000-km radius, and 2.7% for a 1000-km radius. These numbers are dominated by a residual timedependent bias in the order of 3%/month. The latter can be reduced, e.g., from 2.4% to 1.6% as shown by an empirical time-dependent bias correction. Standard deviations of the daily means, calculated from the individual measurements of each day, are excluding time-dependent biases, thus showing the potential precision of WFMD daily means, i.e., 0.3% for a 2000-km selection radius, and 0.6% for a 1000-km selection radius. Therefore, the annual cycle as well as possibly the day-to-day variability could be captured under the prerequisite of further advanced time-dependent bias corrections, or the use of other channels, where the icing issue is less prominent.

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“…The Interferometric Monitor for Greenhouse gases (IMG) (Kobayashi et al, 1999a) launched aboard ADEOS in August 1996 was the first high resolution nadir infrared instrument allowing the simultaneous measurement from space of a series of trace gases: H 2 O, CO 2 , N 2 O, CH 4 , CFCs, O 3 , and CO. Unfortunately, in June 1997, the ADEOS satellite ceased to collect and transmit data due to a power failure in its solar panel.…”

Section: Introductionmentioning

confidence: 99%

“…IMG was a nadir-viewing Fourier transform interferometer that recorded the thermal emission of the Earth-atmosphere system between 600 and 3030 cm −1 , with a maximum optical path difference (MOPD) of 10 cm (Kobayashi et al, 1999a). The footprint on the ground was 8 km×8 km, in three spectral bands (band 1 from 2387 to 3030 cm −1 , band 2 from 2000 to 2500 cm −1 , and band 3 from 600 to 2000 cm −1 ), corresponding to three different detectors and three geographically adjacent footprints.…”

Section: Introductionmentioning

confidence: 99%

Trace gas measurements from infrared satellite for chemistry and climate applications

et al. 2003

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Abstract. Space-borne thermal infrared instruments working in the nadir geometry are providing spectroscopic measurements of species that impact on the chemical composition of the atmosphere and on the climate forcing: H 2 O, CO 2 , N 2 O, CH 4 , CFCs, O 3 , and CO. The atmospheric abundances obtained from the analysis of IMG/ADEOS measurements are discussed in order to demonstrate the potential scientific return to be expected from future missions using advanced infrared nadir sounders. Some strengths and limitations of passive infrared remote sensing from space are illustrated.

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Development and evaluation of the interferometric monitor for greenhouse gases: a high-throughput Fourier-transform infrared radiometer for nadir Earth observation

Cited by 60 publications

References 8 publications

Retrieval of CO from SCIAMACHY onboard ENVISAT: detection of strongly polluted areas and seasonal patterns in global CO abundances

Retrieval of CO from SCIAMACHY onboard ENVISAT: detection of strongly polluted areas and seasonal patterns in global CO abundances

Validation of ENVISAT/SCIAMACHY columnar methane by solar FTIR spectrometry at the Ground-Truthing Station Zugspitze

Trace gas measurements from infrared satellite for chemistry and climate applications

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