Intercomparisons of trace gases profiles from the Odin/SMR and Aura/MLS limb sounders

Barret, Brice; Ricaud, P.; Santee, M. L.; Attié, Jean-Luc; Urban, Joachim; Flochmoën, É. Le; Berthet, Gwenaël; Murtagh, Donal; Eriksson, Patrick; Jones, A.; Noë, J. de La; Dupuy, É.; Froidevaux, L.; Livesey, N. J.; Waters, J. W.; Filipiak, M. J.

doi:10.1029/2006jd007305

Cited by 37 publications

(67 citation statements)

References 26 publications

(43 reference statements)

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“…The SMR CO measurements and data analysis methodology were described in detail by Dupuy et al (2004). Early qualitative comparisons with ACE-FTS were published by Jin et al (2005), whilst a detailed comparison of SMR/Odin with Aura/MLS can be found in Barret et al (2006).…”

Section: Smr/odinmentioning

confidence: 99%

“…Note that the upper limit altitude of the MOZAIC measurement is often close to, or at the same altitude, as the ACE-FTS lowest measured altitude. estimated at better than 25 ppbv in the stratosphere increasing up to 1-2 ppmv at ∼80 km (Barret et al, 2006). The SMR CO measurements and data analysis methodology were described in detail by Dupuy et al (2004).…”

Section: Smr/odinmentioning

confidence: 99%

“…Intercomparison experiments are needed to validate the CO products obtained by different remote sounding instruments (Clerbaux et al, 2002;Emmons et al, 2004;Jin et al, 2005;Sussmann and Buchwitz, 2005;Dils et al, 2006;Barret et al, 2006;Luo et al, 2007a;Pumphrey et al, 2007;Warner et al, 2007;Rinsland et al, 2008). As the ACE mission approached its first public data release, a comprehensive exercise was undertaken to validate the retrieved profiles with the other datasets available.…”

Section: Introductionmentioning

confidence: 99%

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CO measurements from the ACE-FTS satellite instrument: data analysis and validation using ground-based, airborne and spaceborne observations

et al. 2008

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Published by Copernicus Publications on behalf of the European Geosciences Union. constructed from averaged ACE-FTS data over China and completed with TES data over the 5 same area below 6 km. The vertical sensitivity of each CO sounding type of instrument is also 6 reported on the right-hand side of this plot. MW and TIR refer to millimeter-wave and 7 thermal infrared spectral regions, respectively. 8 Fig. 1. Schematic plot of a standard atmospheric CO profile, with the different sources of production (blue) and destruction/sinks (red) as a function of altitude. The CO profile was constructed from averaged ACE-FTS data over China and completed with TES data over the same area below 6 km. The vertical sensitivity of each CO sounding type of instrument is also reported on the right-hand side of this plot. MW and TIR refer to millimeter-wave and thermal infrared spectral regions, respectively.Abstract. The Atmospheric Chemistry Experiment (ACE) mission was launched in August 2003 to sound the atmosphere by solar occultation. Carbon monoxide (CO), a good tracer of pollution plumes and atmospheric dynamics, is one of the key species provided by the primary instrument, the ACE-Fourier Transform Spectrometer (ACE-FTS). This instrument performs measurements in both the CO 1-0 and 2-0 ro-vibrational bands, from which vertically resolved CO concentration profiles are retrieved, from the mid-troposphere to the thermosphere. This paper presents an updated description of the ACE-FTS version 2.2 CO data product, along with a comprehensive validation of these profiles using available observations (February 2004 to December 2006. We have compared the CO partial columns with ground-based measurements using Fourier transform infrared spectroscopy and millimeter wave radiometry, and the volume mixing ratio profiles with airborne (both high-altitude balloon flight and airplane) observations. CO satellite observations provided by nadir-looking instruments (MOPITT and TES) as well as limb-viewing remote sensors (MIPAS, SMR and MLS) were also compared with the ACE-FTS CO products. We show that the ACE-FTS measurements provide CO profiles with small retrieval errors (better than 5% from the upper troposphere to 40 km, and better than 10% above). These observations agree well with the correlative measurements, considering the rather loose coincidence criteria in some cases. Based on the validation exercise we assess the following uncertainties to the ACE-FTS measurement data: better than 15% in the upper troposphere (8-12 km), than 30% in the lower stratosphere (12-30 km), and than 25% from 30 to 100 km.

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Section: Smr/odinmentioning

confidence: 99%

Section: Smr/odinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CO measurements from the ACE-FTS satellite instrument: data analysis and validation using ground-based, airborne and spaceborne observations

et al. 2008

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“…The Aura-MLS ozone version 1.5 dataset was compared with numerous correlative datasets (including SAGE II, HALOE, POAM III and the previous data version (v2.1) of ACE-FTS O 3 ) in the early validation study of and with Odin/SMR (Bordeaux version 222 processor) by Barret et al (2006). An overall agreement of 5-10% was found throughout the stratosphere, with Aura-MLS biased high in the lower stratosphere but low in the upper stratosphere.…”

Section: Aura-mlsmentioning

confidence: 99%

Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Dupuy¹,

Walker²,

Kar³

et al. 2009

Atmos. Chem. Phys.

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Abstract. This paper presents extensive bias determination analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare the latest ozone data products from ACE-FTS and ACE-MAESTRO with coincident observations from nearly 20 satellite-borne, airborne, balloonborne and ground-based instruments, by analysing volume mixing ratio profiles and partial column densities. The ACE-FTS version 2.2 Ozone Update product reports more ozone than most correlative measurements from the upper troposphere to the lower mesosphere. At altitude levels from 16 to 44 km, the average values of the mean relative differences are nearly all within +1 to +8%. At higher altitudes (45-60 km), the ACE-FTS ozone amounts are significantly larger than those of the comparison instruments, with mean relative differences of up to +40% (about +20% on average). For the ACE-MAESTRO version 1.2 ozone data product, mean relative differences are within ±10% (average values within ±6%) between 18 and 40 km for both the sunrise and sunset measurements. At higher altitudes (∼35-55 km), systematic biases of opposite sign are found between the ACE-MAESTRO sunrise and sunset observations. While ozone amounts derived from the ACE-MAESTRO sunrise occultation data are often smaller than the coincident observations (with mean relative differences down to −10%), the sunset occultation profiles for ACE-MAESTRO show results that are qualitatively similar to ACE-FTS, indicating a large positive bias (mean relative differences within +10 to +30%) in the 45-55 km altitude range. In contrast, there is no significant systematic difference in bias found for the ACE-FTS sunrise and sunset measurements.

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“…Most of the measurements have been validated (e.g. Barret et al, 2006). The present study is based upon the retrievals of the 502.296-GHz N 2 O line measured by Odin/SMR using the Optimal Estimation Method (Rodgers, 2000 , 2006).…”

Section: Introductionmentioning

confidence: 99%

Impact of land convection on troposphere-stratosphere exchange in the tropics

et al. 2007

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Abstract. The mechanism of troposphere-stratosphere exchange in the tropics was investigated from space-borne observations of the horizontal distributions of troposphericorigin long-lived species, nitrous oxide (N 2 O), methane (CH 4 The vertical resolution of the satellite measurements ranges from 2 to 4 km. The analysis has been performed on isentropic surfaces: 400 K (lower stratosphere) for all the species and 360 K (upper troposphere) only for CO. At 400 K (and 360 K for CO), all gases show significant longitudinal variations with peak-to-trough values of ∼5-11 ppbv for N 2 O, 0.07-0.13 ppmv for CH 4 , and ∼10 ppbv for CO (∼40 ppbv at 360 K). The maximum amounts are primarily located over Africa and, depending on the species, secondary more or less pronounced maxima are reported above northern South America and South-East Asia. The lower stratosphere over the Western Pacific deep convective region where the outgoing longwave radiation is the lowest, the tropopause the highest and the coldest, appears as a region of minimum concentration of tropospheric trace species. The possible impact on trace gas concentration at the tropopause of the inhomogeneous distribution and intensity of the sources, mostly continental, of the horizontal and vertical transports in the troposphere, and of cross-tropopause transport was explored with the MOCAGE Chemistry Transport Model. In the Correspondence to: P. Ricaud (philippe.ricaud@aero.obs-mip.fr) simulations, significant longitudinal variations were found on the medium-lived CO (2-month lifetime) with peak-totrough value of ∼20 ppbv at 360 K and ∼10 ppbv at 400 K, slightly weaker than observations. However, the CH 4 (8-10 year lifetime) and N 2 O (130-year lifetime) longitudinal variations are significantly weaker than observed: peak-totrough values of ∼0.02 ppmv for CH 4 and 1-2 ppbv for N 2 O at 400 K. The large longitudinal contrast of N 2 O and CH 4 concentrations reported by the space-borne instruments at the tropopause and in the lower stratosphere not captured by the model thus requires another explanation. The suggestion is of strong overshooting over land convective regions, particularly Africa, very consistent with the space-borne Tropical Rainfall Measuring Mission (TRMM) radar maximum overshooting features over the same region during the same season. Compared to observations, the MOCAGE model forced by ECMWF analyses is found to ignore these fast local uplifts, but to overestimate the average uniform vertical transport in the UTLS at all longitudes in the tropics.)

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Intercomparisons of trace gases profiles from the Odin/SMR and Aura/MLS limb sounders

Cited by 37 publications

References 26 publications

CO measurements from the ACE-FTS satellite instrument: data analysis and validation using ground-based, airborne and spaceborne observations

CO measurements from the ACE-FTS satellite instrument: data analysis and validation using ground-based, airborne and spaceborne observations

Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Impact of land convection on troposphere-stratosphere exchange in the tropics

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