Infrared dust spectral signatures from AIRS

DeSouza‐Machado, Sergio; Strow, L. Larrabee; Hannon, S.; Motteler, Howard E.

doi:10.1029/2005gl024364

Cited by 99 publications

(101 citation statements)

References 22 publications

(34 reference statements)

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“…The 10-12 µm band, which is sensitive to differences in the mineralogical composition amongst sources, is relevant to the retrieval of various spaceborne sensors, including IASI, AIRS and MODIS (De Souza Machado et al, 2006;Hudson et al, 2008a;Klüser et al, 2011;Laskina et al, 2012). Some of the discrepancies between our values and the OPAC database are, at least partially, due to differences in the optical constants of the individual minerals.…”

Section: Final Remarks Conclusion and Perspectivesmentioning

confidence: 85%

Mapping the physico-chemical properties of mineral dust in western Africa: mineralogical composition

et al. 2014

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Abstract. In the last few years, several ground-based and airborne field campaigns have allowed the exploration of the properties and impacts of mineral dust in western Africa, one of the major emission and transport areas worldwide. In this paper, we explore the synthesis of these observations to provide a large-scale quantitative view of the mineralogical composition and its variability according to source region and time after transport.This work reveals that mineral dust in western Africa is a mixture of clays, quartz, iron and titanium oxides, representing at least 92 % of the dust mass. Calcite ranged between 0.3 and 8.4 % of the dust mass, depending on the origin. Our data do not show a systematic dependence of the dust mineralogical composition on origin; this is to be the case as, in most of the instances, the data represent the composition of the atmospheric burden after 1-2 days after emission, when air masses mix and give rise to a more uniform dust load. This has implications for the representation of the mineral dust composition in regional and global circulation models and in satellite retrievals.Iron oxides account for 58 ± 7 % of the mass of elemental Fe and for between 2 and 5 % of the dust mass. Most of them are composed of goethite, representing between 52 and 78 % of the iron oxide mass. We estimate that titanium oxides account for 1-2 % of the dust mass, depending on whether the dust is of Saharan or Sahelian origin.The mineralogical composition is a critical parameter for estimating the radiative and biogeochemical impact of mineral dust. The results regarding dust composition have been used to estimate the optical properties as well as the iron fractional solubility of Saharan and Sahelian dust.Data presented in this paper are provided in numerical form upon email request while they are being turned into a public database, the Dust-Mapped Archived Properties (DUST-MAP), which is an open repository for compositional data from other source regions in Africa and worldwide.

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Section: Final Remarks Conclusion and Perspectivesmentioning

confidence: 85%

Mapping the physico-chemical properties of mineral dust in western Africa: mineralogical composition

et al. 2014

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“…These types of observations allow for characterization of aerosol ICT at night or at much finer temporal resolutions during the day (Pierangelo et al, 2004;DeSouza-Machado et al, 2006;Peyridieu et al, 2010;DeSouza-Machado et al, 2010;Knapp et al, 2002;Prados et al, 2007;Thieuleux et al, 2005;. However, geostationary measurements have been underused for studying aerosol ICT.…”

Section: Quantifying Aerosol Loadingmentioning

confidence: 99%

Satellite perspective of aerosol intercontinental transport: From qualitative tracking to quantitative characterization

Remer

Kahn

et al. 2013

Atmospheric Research

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Evidence of aerosol intercontinental transport (ICT) is both widespread and compelling. Model simulations suggest that ICT could significantly affect regional air quality and climate, but the broad inter-model spread of results underscores a need of constraining model simulations with measurements. Satellites have inherent advantages over in situ measurements to characterize aerosol ICT, because of their spatial and temporal coverage. Significant progress in satellite remote sensing of aerosol properties during the Earth Observing System (EOS) era offers the opportunity to increase quantitative characterization and estimates of aerosol ICT beyond the capability of pre-EOS era satellites that could only qualitatively track aerosol plumes. EOS satellites also observe emission strengths and injection heights of some aerosols, aerosol precursors, and aerosol-related gases, which can help characterize aerosol ICT. We review how the current generation of satellite measurements have been used to (1) characterize the evolution of aerosol plumes (e.g., both horizontal and vertical transport, and properties) on an episodic basis, (2) understand the seasonal and inter-annual variations of aerosol ICT and their control factors, (3) estimate the export and import fluxes of aerosols, and (4) evaluate and constrain model simulations. Substantial effort is needed to further explore an integrated approach using measurements from on-orbit satellites (e.g., A-Train synergy) for observational characterization and model constraint of aerosol intercontinental transport and to develop advanced sensors for future missions.

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“…for the detection of ice (Kahn et al, 2003), ash (Carn et al, 2005) and sand (DeSouza-Machado et al, 2006) but also for weak absorbing trace gases, such as sulfur dioxide (SO 2 ) (Clarisse et al, 2008) and ammonia (NH 3 ) . The use of BTDs on hyperspectral measurements has the advantage of being able to largely avoid contamination with (other) trace gases.…”

Section: Feature Detectionmentioning

confidence: 99%

A unified approach to infrared aerosol remote sensing and type specification

et al. 2013

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Atmospheric aerosols impact air quality and global climate. Space based measurements are the best way to observe their spatial and temporal distributions, and can also be used to gain better understanding of their chemical, physical and optical properties. Aerosol composition is the key parameter affecting the refractive index, which determines how much radiation is scattered and absorbed. Composition of aerosols is unfortunately not measured by state of the art satellite remote sounders. Here we use high resolution infrared measurements for aerosol type differentiation, exploiting, in that part of spectrum, the dependency of their refractive index on wavelength. We review existing detection methods and present a unified detection method based on linear discrimination analysis. We demonstrate this method on measurements of the Infrared Atmospheric Sounding Interferometer (IASI) and five different aerosol types, namely volcanic ash, windblown sand, sulfuric acid droplets, ammonium sulfate and smoke particles. We compare these with traditional MODIS AOD measurements. The detection of the last three types is unprecedented in the infrared in nadir mode, but is very promising, especially for sulfuric acid droplets which are detected in the lower troposphere and up to 6 months after injection in the upper troposphere/lower stratosphere

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Infrared dust spectral signatures from AIRS

Cited by 99 publications

References 22 publications

Mapping the physico-chemical properties of mineral dust in western Africa: mineralogical composition

Mapping the physico-chemical properties of mineral dust in western Africa: mineralogical composition

Satellite perspective of aerosol intercontinental transport: From qualitative tracking to quantitative characterization

A unified approach to infrared aerosol remote sensing and type specification

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