In-Orbit Measurement of the AOS (Acousto-Optical Spectrometer) Response Using Frequency Comb Signals

Mizobuchi, S.; Kikuchi, K.; Ochiai, Satoshi; Nishibori, Toshiyuki; Sano, Takeshi; Tamaki, Kenta; Ozeki, Hiroyuki

doi:10.1109/jstars.2012.2196413

Cited by 22 publications

(12 citation statements)

References 10 publications

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“…A rejection rate of an image band (β image ) was implemented considering the SBS characteristics. We employed the AOS response function improved by Mizobuchi et al (2012). The AOS response function was obtained by fitting with three Gaussian functions.…”

Section: Forward Modelmentioning

confidence: 99%

“…Uncertainty in R ANT and β image was 2 % in FWHM and ±3 dB, respectively, which are same as the error analysis for the V215 ClO by Sato et al (2012). Uncertainty in the AOS response function was set to 5 % (Mizobuchi et al, 2012 In this error analysis, the total random error includes an error due to spectrum statistical noise ( x noise ), a smoothing error ( x smooth ) and errors due to uncertainties in the atmospheric temperature and pressure profiles. x noise was calculated using…”

Section: Error Analysismentioning

confidence: 99%

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Vertical profile of δ<sup>18</sup>OOO from the middle stratosphere to lower mesosphere from SMILES spectra

et al. 2014

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Abstract.Ozone is known to have large oxygen isotopic enrichments of about 10 % in the middle stratosphere; however, there have been no reports of ozone isotopic enrichments above the middle stratosphere. We derived an enrichment δ 18 OOO in the stratosphere and the lower mesosphere from observations of the Superconducting SubmillimeterWave Limb-Emission Sounder (SMILES) onboard the International Space Station (ISS) using a retrieval algorithm optimized for the isotopic ratio. The retrieval algorithm includes (i) an a priori covariance matrix constrained by oxygen isotopic ratios in ozone, (ii) an optimization of spectral windows for ozone isotopomers and isotopologues, and (iii) common tangent height information for all windows. The δ 18 OOO by averaging the SMILES measurements at the latitude range of 20 to 40 • N from February to March in 2010 with solar zenith angle < 80 • was 13 % (at 32 km) with the systematic error of about 5 %. SMILES and past measurements were in good agreement, with δ 18 OOO increasing with altitude between 30 and 40 km. The vertical profile of δ 18 OOO obtained in this study showed an increase and a decrease with altitude in the stratosphere and mesosphere, respectively. The δ 18 OOO peak, 18 %, is found at the stratopause. The δ 18 OOO has a positive correlation with temperature in the range of 220-255 K, indicating that temperature can be a dominant factor to control the vertical profile of δ 18 OOO in the stratosphere and mesosphere. This is the first report of the observation of δ 18 OOO over a wide altitude range extending from the stratosphere to the mesosphere (28-57 km).

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Section: Forward Modelmentioning

confidence: 99%

Section: Error Analysismentioning

confidence: 99%

Vertical profile of δ<sup>18</sup>OOO from the middle stratosphere to lower mesosphere from SMILES spectra

et al. 2014

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“…The uncertainty in the spectroscopic parameters includes the target O 3 line and also other species. The uncertainty related to the SMILES instrument functions is given by the SMILES instrument team, for example, , Mizobuchi et al (2012) and Sato et al (2012). 2.…”

Section: Error Analysis Of Smiles O 3 Vertical Profilementioning

confidence: 99%

Validation of stratospheric and mesospheric ozone observed by SMILES from International Space Station

et al. 2013

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We observed ozone (O₃) in the vertical region between 250 and 0.0005 hPa (~ 12–96 km) using the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) on the Japanese Experiment Module (JEM) of the International Space Station (ISS) between 12 October 2009 and 21 April 2010. The new 4 K superconducting heterodyne receiver technology of SMILES allowed us to obtain a one order of magnitude better signal-to-noise ratio for the O₃ line observation compared to past spaceborne microwave instruments. The non-sun-synchronous orbit of the ISS allowed us to observe O₃ at various local times. We assessed the quality of the vertical profiles of O₃ in the 100–0.001 hPa (~ 16–90 km) region for the SMILES NICT Level 2 product version 2.1.5. The evaluation is based on four components: error analysis; internal comparisons of observations targeting three different instrumental setups for the same O₃ 625.371 GHz transition; internal comparisons of two different retrieval algorithms; and external comparisons for various local times with ozonesonde, satellite and balloon observations (ENVISAT/MIPAS, SCISAT/ACE-FTS, Odin/OSIRIS, Odin/SMR, Aura/MLS, TELIS). SMILES O₃ data have an estimated absolute accuracy of better than 0.3 ppmv (3%) with a vertical resolution of 3–4 km over the 60 to 8 hPa range. The random error for a single measurement is better than the estimated systematic error, being less than 1, 2, and 7%, in the 40–1, 80–0.1, and 100–0.004 hPa pressure regions, respectively. SMILES O₃ abundance was 10–20% lower than all other satellite measurements at 8–0.1 hPa due to an error arising from uncertainties of the tangent point information and the gain calibration for the intensity of the spectrum. SMILES O₃ from observation frequency Band-B had better accuracy than that from Band-A. A two month period is required to accumulate measurements covering 24 h in local time of O₃ profile. However such a dataset can also contain variation due to dynamical, seasonal, and latitudinal effects

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“…Two acousto-optical spectrometers (AOSs), called UNIT 1 and UNIT 2, were used for spectral detection. Response functions of the AOSs were measured in orbit (Mizobuchi et al, 2012). UNIT 1 of the AOS was used for ClO observations.…”

Section: T O Sato Et Al: Error Analysis and Diurnal Variation Of Smentioning

confidence: 99%

Strato-mesospheric ClO observations by SMILES: error analysis and diurnal variation

et al. 2012

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Abstract. Chlorine monoxide (ClO) is the key species for anthropogenic ozone losses in the middle atmosphere. We observed ClO diurnal variations using the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) on the International Space Station, which has a non-sunsynchronous orbit. This includes the first global observations of the ClO diurnal variation from the stratosphere up to the mesosphere. The observation of mesospheric ClO was possible due to 10-20 times better signal-to-noise (S/N) ratio of the spectra than those of past or ongoing microwave/submillimeter-wave limb-emission sounders. We performed a quantitative error analysis for the strato-and mesospheric ClO from the Level-2 research (L2r) product version 2.1.5 taking into account all possible contributions of errors, i.e. errors due to spectrum noise, smoothing, and uncertainties in radiative transfer model and instrument functions. The SMILES L2r v2.1.5 ClO data are useful over the range from 0.01 and 100 hPa with a total error estimate of 10-30 pptv (about 10 %) with averaging 100 profiles. The SMILES ClO vertical resolution is 3-5 km and 5-8 km for the stratosphere and mesosphere, respectively. The SMILES observations reproduced the diurnal variation of stratospheric ClO, with peak values at mid-

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In-Orbit Measurement of the AOS (Acousto-Optical Spectrometer) Response Using Frequency Comb Signals

Cited by 22 publications

References 10 publications

Vertical profile of δ<sup>18</sup>OOO from the middle stratosphere to lower mesosphere from SMILES spectra

Vertical profile of δ<sup>18</sup>OOO from the middle stratosphere to lower mesosphere from SMILES spectra

Validation of stratospheric and mesospheric ozone observed by SMILES from International Space Station

Strato-mesospheric ClO observations by SMILES: error analysis and diurnal variation

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In-Orbit Measurement of the AOS (Acousto-Optical Spectrometer) Response Using Frequency Comb Signals

Cited by 22 publications

References 10 publications

Vertical profile of δ&lt;sup&gt;18&lt;/sup&gt;OOO from the middle stratosphere to lower mesosphere from SMILES spectra

Vertical profile of δ&lt;sup&gt;18&lt;/sup&gt;OOO from the middle stratosphere to lower mesosphere from SMILES spectra

Validation of stratospheric and mesospheric ozone observed by SMILES from International Space Station

Strato-mesospheric ClO observations by SMILES: error analysis and diurnal variation

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Product

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Vertical profile of δ<sup>18</sup>OOO from the middle stratosphere to lower mesosphere from SMILES spectra

Vertical profile of δ<sup>18</sup>OOO from the middle stratosphere to lower mesosphere from SMILES spectra