Studies for the Odin sub-millimetre radiometer. II. Retrieval methodology

Baron, Philippe; Ricaud, P.; Noë, J. de La; Eriksson, Patrick; Merino, F.; Ridal, Martin; Murtagh, Donal

doi:10.1139/p01-150

Cited by 40 publications

(35 citation statements)

References 3 publications

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“…The time period 2002 shows up to 50 % smaller mixing ratios compared to OSO. One reason for the observed difference between the OSO and MIPAS (12 + 13) mesospheric CO datasets can be due to baseline features seen in the OSO spectra before February 2004.…”

Section: Discussionmentioning

confidence: 94%

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Six years of mesospheric CO estimated from ground-based frequency-switched microwave radiometry at 57° N compared with satellite instruments

et al. 2012

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Abstract. Measurements of mesospheric carbon monoxide, CO, provide important information about the dynamics in the mesosphere region since CO has a long lifetime at these altitudes. Ground-based measurements of mesospheric CO made at the Onsala Space Observatory, OSO, (57 • N, 12 • E) are presented. The dataset covers the period 2002-2008 and is hence uniquely long for ground-based observations. The simple and stable 115 GHz frequency-switched radiometer, calibration method, retrieval procedure and error characterization are described. A comparison between our measurements and co-located CO measurements from the satellite sensors ACE-FTS on Scisat (v2.2), MLS on Aura (v3-3), MIPAS on Envisat (V3O CO 12 + 13 and V4O CO 200) and SMR on Odin (v225 and v021) is carried out. Our instrument, OSO, and the four satellite instruments show the same general variation of the vertical distribution of mesospheric CO in both the annual cycle and in shorter time period events, with high CO mixing ratios during winter and very low amounts during summer in the observed 55-100 km altitude range.

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Section: Discussionmentioning

confidence: 94%

“…A row in the AVK matrix can be regarded as a smoothing function (averaging kernel) describing the vertical resolution of the retrievals. The area of this smoothing function is called the measurement response and gives a rough indication of the contribution of the measurement to the retrieved value (Baron et al, 2002).…”

Section: Terminologymentioning

confidence: 99%

Six years of mesospheric CO estimated from ground-based frequency-switched microwave radiometry at 57° N compared with satellite instruments

et al. 2012

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“…The value of this sum is generally referred to as the measurement response (Baron et al, 2002;Rodgers, 2004) and is shown by the black line in Fig. 3c.…”

Section: Results Of the Retrievalsmentioning

confidence: 99%

Atmospheric ozone above Troll station, Antarctica observed by a ground based microwave radiometer

Daae

Straub

Espy

et al. 2014

Earth Syst. Sci. Data

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Abstract. This paper describes the stratospheric and mesospheric ozone profiles retrieved from spectral measurements of the 249.96 GHz O 3 line, using the British Antarctic Survey's ground-based Microwave Radiometer at Troll (BAS-MRT), Antarctica (72• 01 S, 02• 32 E, 62• Mlat). The instrument operated at Troll from February 2008 through January 2010, and hourly averaged spectra were used to retrieve approximately 20 ozone profiles per day. The ozone profiles cover the pressure range from 3 hPa to 0.02 hPa (approximately 38 to 72 km) which includes the topside of the stratospheric ozone layer and the peak of the tertiary maximum. Comparing the retrieved ozone volume mixing ratio (vmr) values to Aura/MLS and SD-WACCM shows no significant bias to within the instrumental uncertainties. The long-term variations (> 20 days) between MLS and SD-WACCM agree well with BAS-MRT at all altitudes with significant correlation coefficients of at least 0.9 (0.7 with SD-WACCM) in the upper stratosphere and middle mesosphere. A weaker correlation is found for the long-term variations in summer when most of the vmr values are below the random noise level of Aura/MLS. The correlation of short-term variations (< 20 days) between MLS and BAS-MRT agree well at all altitudes with significant correlation coefficients of at least 0.7 in the upper stratosphere and middle mesosphere. The ozone profiles retrieved at Troll, Antarctica extend the sparse data coverage of middle atmospheric ozone above Antarctica, where, due to the dynamic nature of the ozone concentrations, systematic observations with a high temporal resolution are desirable. The O 3 profiles presented here are stored at the UK's Polar Data Centre (http://doi.org/nc3) and are available for public scientific use.

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“…This figure also shows measurement response m and averaging kernel A. Details on m are explained by Baron et al (2002), and we simplified them as…”

Section: Methods Of Error Calculationmentioning

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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Studies for the Odin sub-millimetre radiometer. II. Retrieval methodology

Cited by 40 publications

References 3 publications

Six years of mesospheric CO estimated from ground-based frequency-switched microwave radiometry at 57° N compared with satellite instruments

Six years of mesospheric CO estimated from ground-based frequency-switched microwave radiometry at 57° N compared with satellite instruments

Atmospheric ozone above Troll station, Antarctica observed by a ground based microwave radiometer

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

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