Technical Note: New ground-based FTIR measurements at Ile de La Réunion: observations, error analysis, and comparisons with independent data

Senten, C.; Mazière, Martine De; Dils, B.; Hermans, Christian; Kruglanski, M.; Neefs, Eddy; Scolas, F.; Vandaele, Ann Carine; Vanhaelewyn, Gauthier; Vigouroux, Corinne; Carleer, Michel; Coheur, Pierre‐François; Fally, Sophie; Barret, Brice; Baray, Jean-Luc; Delmas, R.; Leveau, Jean; Metzger, Jean‐Marc; Mahieu, Emmanuel; Boone, C. D.; Walker, Kaley A.; Bernath, P. F.; Strong, Kimberly

doi:10.5194/acp-8-3483-2008

Cited by 62 publications

(51 citation statements)

References 40 publications

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“…The measurements used in this study are performed with a Bruker 120M spectrometer. Details on the measurements can be found in Senten et al (2008) and Vigouroux et al (2012).…”

Section: Sites Descriptionmentioning

confidence: 99%

Retrieval of ammonia from ground-based FTIR solar spectra

et al. 2015

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Abstract. We present a retrieval method for ammonia (NH 3 ) total columns from ground-based Fourier transform infrared (FTIR) observations. Observations from Bremen (53.10 15 molecules cm −2 ). In conditions with high surface concentrations of ammonia, as in Bremen, it is possible to retrieve information on the vertical gradient, as two layers can be distinguished. The retrieval there is most sensitive to ammonia in the planetary boundary layer, where the trace gas concentration is highest. For conditions with low concentrations, only the total column can be retrieved. Combining the systematic and random errors we have a mean total error of 26 % for all spectra measured at Bremen (number of spectra (N) = 554), 30 % for all spectra from Lauder (N = 2412), 25 % for spectra from Réunion (N = 1262) and 34 % for spectra measured at Jungfraujoch (N = 2702). The error is dominated by the systematic uncertainties in the spectroscopy parameters. Station-specific seasonal cycles were found to be consistent with known seasonal cycles of the dominant ammonia sources in the station surroundings. The developed retrieval methodology from FTIR instruments provides a new way of obtaining highly timeresolved measurements of ammonia burdens. FTIR-NH 3 observations will be useful for understanding the dynamics of ammonia concentrations in the atmosphere and for satellite and model validation. It will also provide additional information to constrain the global ammonia budget.

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“…The measurements used in this study are performed with a Bruker 120M spectrometer. Details on the measurements can be found in Senten et al (2008) and Vigouroux et al (2012).…”

Section: Sites Descriptionmentioning

confidence: 99%

Retrieval of ammonia from ground-based FTIR solar spectra

et al. 2015

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“…The measurement site on the university campus of Saint Denis (Senten et al, 2008) is located on the remote Réunion Island in the Indian Ocean. Observed NH 3 columns (Fig.…”

Section: Ftir-nh 3 Retrievalmentioning

confidence: 99%

An evaluation of IASI-NH<sub>3</sub> with ground-based Fourier transform infrared spectroscopy measurements

et al. 2016

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Abstract. Global distributions of atmospheric ammonia (NH 3 ) measured with satellite instruments such as the Infrared Atmospheric Sounding Interferometer (IASI) contain valuable information on NH 3 concentrations and variability in regions not yet covered by ground-based instruments. Due to their large spatial coverage and (bi-)daily overpasses, the satellite observations have the potential to increase our knowledge of the distribution of NH 3 emissions and associated seasonal cycles. However the observations remain poorly validated, with only a handful of available studies often using only surface measurements without any vertical information. In this study, we present the first validation of the IASI-NH 3 product using ground-based Fourier transform infrared spectroscopy (FTIR) observations. Using a recently developed consistent retrieval strategy, NH 3 concentration profiles have been retrieved using observations from nine Network for the Detection of Atmospheric Composition Change (NDACC) stations around the world between 2008 and 2015. We demonstrate the importance of strict spatiotemporal collocation criteria for the comparison. Large differences in the regression results are observed for changing intervals of spatial criteria, mostly due to terrain characteristics and the short lifetime of NH 3 in the atmosphere. The seasonal variations of both datasets are consistent for most sites. Correlations are found to be high at sites in areas with considerable NH 3 levels, whereas correlations are lower at sites with low atmospheric NH 3 levels close to the detection limit of the IASI instrument. A combination of the observations Published by Copernicus Publications on behalf of the European Geosciences Union. These results give an improved estimate of the IASI-NH3 product performance compared to the previous upper-bound estimates (−50 to +100 %).

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“…Long-term BVOC ecosystem-scale flux measurements were performed from a 52 m high tower by the disjunct eddycovariance technique (see e.g. Spirig et al, 2005) (Senten et al, 2008;Vigouroux et al, 2009). For this work we focus on the period between June and December 2009.…”

Section: Inverse Modelling Approachmentioning

confidence: 99%

First space-based derivation of the global atmospheric methanol emission fluxes

et al. 2011

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Abstract. This study provides improved methanol emission estimates on the global scale, in particular for the largest methanol source, the terrestrial biosphere, and for biomass burning. To this purpose, one complete year of spaceborne measurements of tropospheric methanol columns retrieved for the first time by the thermal infrared sensor IASI aboard the MetOp satellite are compared with distributions calculated by the IMAGESv2 global chemistry-transport model. Two model simulations are performed using a priori biogenic methanol emissions either from the new MEGANv2.1 emission model, which is fully described in this work and is based on net ecosystem flux measurements, or from a previous parameterization based on net primary production by Jacob et al. (2005). A significantly better model performance in terms of both amplitude and seasonality is achieved through the use of MEGANv2.1 in most world regions, with respect to IASI data, and to surface-and air-based methanol measurements, even though important discrepancies over several regions are still present. As a second step of this study, we combine the MEGANv2.1 and the IASI column abundances over continents in an inverse modelling scheme based on the adjoint of the IMAGESv2 model to generate an improved global methanol emission source. The global optimized source totals 187 Tg yr −1 with a contribution of 100 Tg yr −1 from plants, only slightly lower than the a priori Correspondence to: T. Stavrakou (jenny@aeronomie.be) MEGANv2.1 value of 105 Tg yr −1 . Large decreases with respect to the MEGANv2.1 biogenic source are inferred over Amazonia (up to 55 %) and Indonesia (up to 58 %), whereas more moderate reductions are recorded in the Eastern US (20-25 %) and Central Africa (25-35 %). On the other hand, the biogenic source is found to strongly increase in the arid and semi-arid regions of Central Asia (up to a factor of 5) and Western US (factor of 2), probably due to a source of methanol specific to these ecosystems which is unaccounted for in the MEGANv2.1 inventory. The most significant error reductions achieved by the optimization concern the derived biogenic emissions over the Amazon and over the Former Soviet Union. The robustness of the derived fluxes to changes in convective updraft fluxes, in methanol removal processes, and in the choice of the biogenic a priori inventory is assessed through sensitivity inversions. Detailed comparisons of the model with a number of aircraft and surface observations of methanol, as well as new methanol measurements in Europe and in the Reunion Island show that the satellite-derived methanol emissions improve significantly the agreement with the independent data, giving thus credence to the IASI dataset.

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Technical Note: New ground-based FTIR measurements at Ile de La Réunion: observations, error analysis, and comparisons with independent data

Cited by 62 publications

References 40 publications

Retrieval of ammonia from ground-based FTIR solar spectra

Retrieval of ammonia from ground-based FTIR solar spectra

An evaluation of IASI-NH<sub>3</sub> with ground-based Fourier transform infrared spectroscopy measurements

First space-based derivation of the global atmospheric methanol emission fluxes

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Technical Note: New ground-based FTIR measurements at Ile de La Réunion: observations, error analysis, and comparisons with independent data

Cited by 62 publications

References 40 publications

Retrieval of ammonia from ground-based FTIR solar spectra

Retrieval of ammonia from ground-based FTIR solar spectra

An evaluation of IASI-NH&lt;sub&gt;3&lt;/sub&gt; with ground-based Fourier transform infrared spectroscopy measurements

First space-based derivation of the global atmospheric methanol emission fluxes

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An evaluation of IASI-NH<sub>3</sub> with ground-based Fourier transform infrared spectroscopy measurements