Retrieval of CO from nadir remote-sensing measurements in the infrared by use of four different inversion algorithms

Clerbaux, Cathy; Hadji‐Lazaro, Juliette; Payan, Sébastien; Camy‐Peyret, C.; Wang, Jinxue; Edwards, D. P.; Luo, Ming

doi:10.1364/ao.41.007068

Cited by 24 publications

(23 citation statements)

References 47 publications

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“…This requires continuous and unbiased long-term data records. MOPITT initiated a record of more than 15 years, which is being continued for the next > 30 years by the IASI series of instruments, with the launch of MetOp-C currently scheduled at the end of 2018, and the IASI-New Generation instruments to be embarked on the MetOp-SG platforms (Clerbaux and Crevoisier, 2013;Crevoisier et al, 2014). A systematic processing of both data sets using the same a priori assumptions is foreseen in the framework of the EU-FP7 projects QA4ECV, and this work is paving the way for establishing such a long-term CO compatible record.…”

Section: Discussionmentioning

confidence: 99%

“…Clerbaux et al (2002) made a first comparison of the TES, MOPITT, and IASI retrieval algorithms to retrieve CO columns from a common nadir radiance data set, provided by the IMG/ADEOS thermal infrared instrument. Luo et al (2007) compared, for 2 days in September 2004, TESretrieved CO profiles adjusted to the MOPITT a priori with the MOPITT retrievals and also the adjusted TES CO profiles with the MOPITT profiles vertically smoothed by the TES averaging kernels.…”

Section: George Et Al: Long-term Co Records From Mopitt and Iasimentioning

confidence: 99%

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An examination of the long-term CO records from MOPITT and IASI: comparison of retrieval methodology

et al. 2015

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Abstract. Carbon monoxide (CO) is a key atmospheric compound that can be remotely sensed by satellite on the global scale. Fifteen years of continuous observations are now available from the MOPITT/Terra mission (2000 to present). Another 15 and more years of observations will be provided by the IASI/MetOp instrument series (2007-2023 >). In order to study long-term variability and trends, a homogeneous record is required, which is not straightforward as the retrieved quantities are instrument and processing dependent. The present study aims at evaluating the consistency between the CO products derived from the MOPITT and IASI missions, both for total columns and vertical profiles, during a 6-year overlap period (2008)(2009)(2010)(2011)(2012)(2013). The analysis is performed by first comparing the available 2013 versions of the retrieval algorithms (v5T for MOPITT and v20100815 for IASI), and second using a dedicated reprocessing of MO-PITT CO profiles and columns using the same a priori information as the IASI product. MOPITT total columns are generally slightly higher over land (bias ranging from 0 to 13 %) than IASI data. When IASI and MOPITT data are retrieved with the same a priori constraints, correlation coefficients are slightly improved. Large discrepancies (total column bias over 15 %) observed in the Northern Hemisphere during the winter months are reduced by a factor of 2 to 2.5. The detailed analysis of retrieved vertical profiles compared with collocated aircraft data from the MOZAIC-IAGOS network, illustrates the advantages and disadvantages of a constant vs. a variable a priori. On one hand, MOPITT agrees better with the aircraft profiles for observations with persisting high levels of CO throughout the year due to pollution or seasonal fire activity (because the climatology-based a priori is supposed to be closer to the real atmospheric state). On the other hand, IASI performs better when unexpected events leading to high levels of CO occur, due to a larger variability associated with the a priori.

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Section: Discussionmentioning

confidence: 99%

Section: George Et Al: Long-term Co Records From Mopitt and Iasimentioning

confidence: 99%

An examination of the long-term CO records from MOPITT and IASI: comparison of retrieval methodology

et al. 2015

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“…Validation of satellite CO retrievals with space-borne, airborne or ground-based measurements has already been performed in the frame of different exercises or campaigns (Clerbaux et al, 2002(Clerbaux et al, , 2008aEmmons et al, 2004Emmons et al, , 2007Emmons et al, , 2009Warner et al, 2007;Luo et al, 2007a and b;Yurganov et al, 2008). In this paper, we focus on the analysis of global CO distributions recently calculated from the radiance spectra recorded by the IASI instrument.…”

Section: Introductionmentioning

confidence: 99%

Carbon monoxide distributions from the IASI/METOP mission: evaluation with other space-borne remote sensors

et al. 2009

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Abstract. The Infrared Atmospheric Sounding Interferometer (IASI) onboard the MetOp satellite measures carbon monoxide (CO) on a global scale, twice a day. CO total columns and vertical profiles are retrieved in near real time from the nadir radiance spectra measured by the instrument in the thermal infrared (TIR) spectral range. This paper describes the measurement vertical sensitivity and provides a first assessment of the capabilities of IASI to measure CO distributions. On the global scale, 0.8 to 2.4 independent pieces of information are available for the retrieval. At mid latitudes, the information ranges between 1.5 and 2, which enables the lower and upper troposphere to be distinguished, especially when thermal contrast is significant. Northern Hemisphere and in the equatorial region. However when strong CO concentrations are present, such as during fire events, these discrepancies can climb as high as 17%. Instrument specifications of IASI versus other missions are also discussed.

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“…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%

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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Retrieval of CO from nadir remote-sensing measurements in the infrared by use of four different inversion algorithms

Cited by 24 publications

References 47 publications

An examination of the long-term CO records from MOPITT and IASI: comparison of retrieval methodology

An examination of the long-term CO records from MOPITT and IASI: comparison of retrieval methodology

Carbon monoxide distributions from the IASI/METOP mission: evaluation with other space-borne remote sensors

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

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