Current status of level 2 product of Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES)

Mitsuda, Chihiro; Suzuki, Makoto; Iwata, Yoshitaka; Manago, Naohiro; Naito, Yoko; Takahashi, C.; Imai, Koji; Nishimoto, Eriko; Hayashi, Hiroo; Shiotani, Masato; Sano, Takeshi; Takayanagi, M.; Taniguchi, Hirotomo

doi:10.1117/12.898135

Cited by 20 publications

(12 citation statements)

References 7 publications

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“…[]). The SMILES Level 2 (L2) data‐processing system [ Mitsuda et al ., ; Takahashi et al ., , ] retrieves vertical profiles of minor atmospheric constituents from the calibrated radiance observations (Level 1 data), and SMILES version 2.3 (hereafter v2.3) L2 products were released for public use in November 2012. In the extensive comparisons with existing satellite data sources, the SMILES ozone generally shows good agreements within 10% (30%) in the stratosphere (mesosphere) [ Imai et al ., ].…”

Section: Introductionmentioning

confidence: 97%

Comparison of ozone profiles between Superconducting Submillimeter‐Wave Limb‐Emission Sounder and worldwide ozonesonde measurements

et al. 2013

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[1] We compared ozone profiles measured by the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) with those taken at worldwide ozonesonde stations. To assess the quality of the SMILES version 2.3 ozone data for 16-30 km, 601 ozonesonde profiles were compared with the coincident SMILES ozone profiles. The agreement between SMILES and ozonesonde measurements was generally good within 5%-7% for 18-30 km at middle and high latitudes but degraded below 18 km. At low latitudes, however, the SMILES ozone data showed larger values (~6%-15% for 20-26 km) than those at middle and high latitudes. To explain this bias, we explored some possible issues in the ozonesonde measurement system. One possibility is due to a pressure bias in radiosonde measurements with a pressure sensor, but it would be within a few percent. We also examined an issue of the ozonesonde's response time. The response time was estimated from ozonesonde measurements with ascending and descending profiles showing clear difference, by using the time lag correction method to minimize the difference between them. Our estimation shows 28 s on average which is a similar value derived by prelaunch preparation. By applying this correction to the original profiles, we found a negative bias of the ascending ozonesonde measurement more than 7% at 20 km in the equatorial latitude where the vertical gradient of ozone is steep. The corrected ozonesonde profiles showed better agreement with the SMILES data. We suggest that the response time of ozonesondes could create a negative bias, particularly in the lower stratosphere at equatorial latitudes.

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Section: Introductionmentioning

confidence: 97%

Comparison of ozone profiles between Superconducting Submillimeter‐Wave Limb‐Emission Sounder and worldwide ozonesonde measurements

et al. 2013

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“…The Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) was attached to the Exposed Facility of the JAXA's Japanese Experiment Module (JEM) of the International Space Station (ISS) and operated between October 2009 and April 2010 (Kikuchi et al, 2010). It measured ozone profiles from 16 to 85 km during daytime and to 96 km during nighttime, 25 derived from measurements between 625 and 651 GHz using the technique described in Mitsuda et al (2011), Takahashi et al (2010), and Takahashi et al (2011). The latitudinal coverage is 38 • S and 65 • N. We use here data version 3.2, available at the Data Archives and Transmission System (DARTS) site (http://darts.isas.jaxa.jp/stp/smiles/).…”

Section: Smilesmentioning

confidence: 99%

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López‐Puertas¹

2018

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In this paper we describe the stratospheric and mesospheric ozone (version V5r_O3_m22) distributions retrieved from MIPAS observations in the three middle atmosphere modes (MA, NLC and UA) taken with an unapodized spectral resolution of 0.0625 cm −1 from 2005 until April 2012. O 3 is retrieved from microwindows in the 14.8 µm and 10 µm spectral regions and requires non-LTE modelling of the O 3 v 1 and v 3 vibrational levels. Ozone is reliably retrieved from 20 km in the MA mode (40 km for UA and NLC) up to ∼105 km during dark conditions and up to ∼95 km during illuminated conditions. 5 Daytime MIPAS O 3 has an average vertical resolution of 3-4 km below 70 km, 6-8 km at 70-80 km, 8-10 km at 80-90 km and 5-7 km at the secondary maximum (90-100 km). For nighttime conditions the vertical resolution is similar below 70 km, and better in the upper mesosphere and lower thermosphere: 4-6 km at 70-100 km, 4-5 km at the secondary maximum, and 6-8 km at 100-105 km. The noise error for daytime conditions is typically smaller than 2% below 50 km, 2-10% between 50 and 70 km, 10-20% at 70-90 km and ∼30% above 95 km. For nighttime, the noise errors are very similar below around 70 km 10 but significantly smaller above, being 10-20% at 75-95 km, 20-30% at 95-100 km and larger than 30% above 100 km. The additional major O 3 errors are the spectroscopic data uncertainties below 50 km (10-12%), and the non-LTE and temperature errors above 70 km. The validation performed suggests that the spectroscopic errors below 50 km, mainly caused by the O 3 air-broadened half-widths of the v 2 band, are overestimated. The non-LTE error (including the uncertainty of atomic oxygen at nighttime) is relevant only above ∼85 km with values of 15-20%. The temperature error varies from ∼3% up to 80 km 15 to 15-20% near 100 km. Between 50 and 70 km, the pointing and spectroscopic errors are the dominant uncertainties. The validation performed in comparisons with SABER, GOMOS, MLS, SMILES and ACE-FTS shows that MIPAS O 3 has an accuracy better than 5% at and below 50 km, with a positive bias of a few percent. In the 50-75 km region, MIPAS O 3 has a positive bias of ≈10%, which is possibly caused in part by O 3 spectroscopic errors in the 10 µm region. Between 75 and 90 km, MIPAS nighttime O 3 is in agreement with other instruments by 10%, but for daytime the agreement is slightly larger, 20 ∼10-20%. Above 90 km, MIPAS daytime O 3 is in agreement with other instruments by 10%. At nighttime, however, it shows a positive bias increasing from 10% at 90 km to 20% at 95-100 km, the latter of which is attributed to the large atomic oxygen Atmos. Meas. Tech. Discuss., https://doi.abundance used. We also present MIPAS O 3 distributions as function of altitude, latitude and time, showing the major O 3 features in the middle and upper mesosphere. In addition to the rapid diurnal variation due to photochemistry, the data also show apparent signatures of the diurnal migrating tide, both during day and nighttime, as well as the effects of the semi-annual oscillation ...

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“…[, ], and further improved by Mitsuda et al . []. The retrieval algorithm is based on the Optima Estimation Method (OEM) applied for atmospheric sounding [ Rodgers , , , ].…”

Section: Smiles Ozone Measurement and Productmentioning

confidence: 99%

“…The SMILES Level 2 (L2) data processing system [ Mitsuda et al ., ; Takahashi et al ., , ] retrieves vertical profiles of minor atmospheric constituents from the calibrated radiance observations (Level 1 data). SMILES version 2.1 (hereafter v2.1) L2 products were released for public use in March 2012.…”

Section: Introductionmentioning

confidence: 97%

Validation of ozone data from the Superconducting Submillimeter‐Wave Limb‐Emission Sounder (SMILES)

et al. 2013

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[1] The Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) onboard the International Space Station provided global measurements of ozone profiles in the middle atmosphere from 12 October 2009 to 21 April 2010. We present validation studies of the SMILES version 2.1 ozone product based on coincidence statistics with satellite observations and outputs of chemistry and transport models (CTMs). Comparisons of the stratospheric ozone with correlative data show agreements that are generally within 10%. In the mesosphere, the agreement is also good and better than 30% even at a high altitude of 73 km, and the SMILES measurements with their local time coverage also capture the diurnal variability very well. The recommended altitude range for scientific use is from 16 to 73 km. We note that the SMILES ozone values for altitude above 26 km are smaller than some of the correlative satellite datasets; conversely the SMILES values in the lower stratosphere tend to be larger than correlative data, particularly in the tropics, with less than 8% difference below~24 km. The larger values in the lower stratosphere are probably due to departure of retrieval results between two detection bands at altitudes below 28 km; it is~3% at 24 km and is increasing rapidly down below.

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Current status of level 2 product of Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES)

Cited by 20 publications

References 7 publications

Comparison of ozone profiles between Superconducting Submillimeter‐Wave Limb‐Emission Sounder and worldwide ozonesonde measurements

Comparison of ozone profiles between Superconducting Submillimeter‐Wave Limb‐Emission Sounder and worldwide ozonesonde measurements

Reply to RC2

Validation of ozone data from the Superconducting Submillimeter‐Wave Limb‐Emission Sounder (SMILES)

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