The MOPITT version 4 CO product: Algorithm enhancements, validation, and long‐term stability

Deeter, M. N.; Edwards, D. P.; Gille, J. C.; Emmons, L. K.; Francis, Gene; Ho, Shu‐Peng; Mao, D.; Masters, Dallas; Worden, H. M.; Drummond, J. R.; Novelli, P. C.

doi:10.1029/2009jd013005

Cited by 155 publications

(207 citation statements)

References 30 publications

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“…CO total columns from the MOPITT multispectral retrievals combining TIR and NIR channels are very similar to the TIR-only results, but are not directly comparable to any of the other instruments. MOPITT V3 and V4 CO profiles and columns were validated with respect to NOAA aircraft in situ CO profile measurements (Emmons et al, 2009;Deeter et al, 2010) and we show a similar comparison for the MOPITT V5T total column with respect to validation data in Fig. 1, along with the latest comparison for V4.…”

Section: Mopittmentioning

confidence: 67%

Decadal record of satellite carbon monoxide observations

et al. 2013

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Abstract. Atmospheric carbon monoxide (CO) distributions are controlled by anthropogenic emissions, biomass burning, transport and oxidation by reaction with the hydroxyl radical (OH). Quantifying trends in CO is therefore important for understanding changes related to all of these contributions. Here we present a comprehensive record of satellite observations from 2000 through 2011 of total column CO using the available measurements from nadir-viewing thermal infrared instruments: MOPITT, AIRS, TES and IASI. We examine trends for CO in the Northern and Southern Hemispheres along with regional trends for Eastern China, Eastern USA, Europe and India. We find that all the satellite observations are consistent with a modest decreasing trend ∼ −1 % yr −1 in total column CO over the Northern Hemisphere for this time period and a less significant, but still decreasing trend in the Southern Hemisphere. Although decreasing trends in the United States and Europe have been observed from surface CO measurements, we also find a decrease in CO over E. China that, to our knowledge, has not been reported previously. Some of the interannual variability in the observations can be explained by global fire emissions, but the overall decrease needs further study to understand the implications for changes in anthropogenic emissions.

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Section: Mopittmentioning

confidence: 67%

Decadal record of satellite carbon monoxide observations

et al. 2013

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“…The fixed S a matrix allows for a 30 % variability in each retrieved layer. The off-diagonal elements which define the correlations between the different layers are consistent with a short vertical correlation length which limits the spread of information from one layer to another (Deeter et al, 2010). On the contrary, the IASI a priori consists on a single profile, and a fixed S a matrix, built from a climatology that uses LMDz-INCA model outputs, MOZAIC aircraft data and ACE-FTS satellite profiles Invariant, mean of the ensemble of profiles used to build S a A priori var-cov matrix Invariant fractional VMR variability of 30 % with vertical correlation over 100 hPa scale heights to the middle troposphere, and then smoothly decreases to 40 ppbv from 7 km up to 18 km.…”

Section: Retrieved Co Productsmentioning

confidence: 97%

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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“…Retrieval errors are estimated to be about 10 % for each retrieval, with regional biases of a few parts per billion. The MOPITT retrievals suffer from a time-varying bias in Version 4 (Deeter et al, 2010), as in Version 3 (Yurganov et al, 2008;Emmons et al, 2009;Drummond et al, 2009). This positive bias drifts by about 0.5 ppbv yr −1 , on average at 700 hPa, in Version 4 (Deeter et al, 2010).…”

Section: Mopitt-v4 Co Retrieved Mixing Ratiosmentioning

confidence: 99%

The formaldehyde budget as seen by a global-scale multi-constraint and multi-species inversion system

et al. 2012

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Abstract. For the first time, carbon monoxide (CO) and formaldehyde (HCHO) satellite retrievals are used together with methane (CH 4 ) and methyl choloroform (CH 3 CCl 3 or MCF) surface measurements in an advanced inversion system. The CO and HCHO are respectively from the MO-PITT and OMI instruments. The multi-species and multisatellite dataset inversion is done for the 2005-2010 period. The robustness of our results is evaluated by comparing our posterior-modeled concentrations with several sets of independent measurements of atmospheric mixing ratios. The inversion leads to significant changes from the prior to the posterior, in terms of magnitude and seasonality of the CO and CH 4 surface fluxes and of the HCHO production by nonmethane volatile organic compounds (NMVOC). The latter is significantly decreased, indicating an overestimation of the biogenic NMVOC emissions, such as isoprene, in the GEIA inventory. CO and CH 4 surface emissions are increased by the inversion, from 1037 to 1394 TgCO and from 489 to 529 TgCH 4 on average for the 2005-2010 period. CH 4 emissions present significant interannual variability and a joint CO-CH 4 fluxes analysis reveals that tropical biomass burning probably played a role in the recent increase of atmospheric methane.

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The MOPITT version 4 CO product: Algorithm enhancements, validation, and long‐term stability

Cited by 155 publications

References 30 publications

Decadal record of satellite carbon monoxide observations

Decadal record of satellite carbon monoxide observations

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

The formaldehyde budget as seen by a global-scale multi-constraint and multi-species inversion system

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