Aerosol properties over the Indian Ocean Experiment (INDOEX) campaign area retrieved from ATSR‐2

Robles-Gonzalez, Cristina; Leeuw, G. de; Decae, R.; Kuśmierczyk-Michulec, Jolanta; Stammes, P.

doi:10.1029/2005jd006184

Cited by 12 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter can nowadays be estimated by using satellites (Veihelmann et al, 2007), but the technique is still at an early stage and relies on the determination of aerosol type from these satellite data. However, even when the aerosol type is known with some degree of confidence (Robles-Gonzalez et al, 2006), the absorption properties are poorly determined. Aerosol particles usually do not have a unique chemical composition: they may be either externally mixed as individual particles of a single composition or they may be internal mixtures of two or more major constituents with their own optical characteristics, which may not be representative of the mixture.…”

Section: Introductionmentioning

confidence: 99%

Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops

et al. 2011

Self Cite

View full text Add to dashboard Cite

Abstract. Absorption photometers for real time application have been available since the 1980s, but the use of filterbased instruments to derive information on aerosol properties (absorption coefficient and black carbon, BC) is still a matter of debate. Several workshops have been conducted to investigate the performance of individual instruments over the intervening years. Two workshops with large sets of aerosol absorption photometers were conducted in 2005 and 2007. The data from these instruments were corrected using existing methods before further analysis. The intercomparison shows a large variation between the responses to absorbing aerosol particles for different types of instruments. The unit to unit variability between instruments can be up to 30% for Particle Soot Absorption Photometers (PSAPs) and Aethalometers. Multi Angle Absorption Photometers (MAAPs) showed a variability of less than 5%. Reasons for the high variability were identified to be variations in sample flow and spot size. It was observed that different flow rates influence system performance with respect to response to absorption and instrumental noise. Measurements with non absorbing particles showed that the current corrections of a cross sensitivity to particle scattering are not sufficient. Remaining cross sensitivities were found to be a function of the total particle load on the filter. The large variation between the response to absorbing aerosol particles for different types of instruments indicates that current correction functions for absorption photometers are not adequate.

show abstract

Section: Introductionmentioning

confidence: 99%

Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops

et al. 2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…The results were used to create look up tables (LUTs) containing the calculated TOA reflection. This method was extensively described in Robles‐Gonzalez et al [2006].…”

Section: Algorithm Descriptionmentioning

confidence: 99%

“…The SAFARI‐2000 area was chosen because of the availability of in situ data that can be used either for the algorithm development or for comparison with the retrieval results. To reach this goal, two aerosol types with different properties, mainly different imaginary part of the refractive index, have been implemented in our aerosol retrieval algorithms for ATSR‐2 following the work described by Robles‐Gonzalez et al [2006]. The retrieval of absorbing aerosol types renders problems because satellite sensors measure reflectance which due to absorption is reduced in the measured signal at the TOA.…”

Section: Introductionmentioning

confidence: 99%

Aerosol properties over the SAFARI‐2000 area retrieved from ATSR‐2

Robles-Gonzalez

Leeuw

2008

J. Geophys. Res.

Self Cite

View full text Add to dashboard Cite

The aerosol optical depth (AOD) at three wavelengths has been retrieved from the radiance measured at the top of the atmosphere (TOA) by the ATSR‐2 (Along Track Scanning Radiometer) during the SAFARI‐2000 (Southern African Regional Science Initiative) dry season field campaign from 1 August to 30 September 2000. Two aerosol types were implemented in the ATSR‐2 retrieval algorithm: a highly absorbing aerosol that is mainly due to biomass burning and a less absorbing mixture of biomass burning, anthropogenic and biogenic aerosols. The mixing ratio of these two aerosol types was determined by comparison of the two modeled aerosol types with the ATSR‐2 measured signal. The accuracy of the AOD values determined from the ATSR‐2 data is 0.08 ± 0.06 for August and 0.14 ± 0.13 for September, as determined from comparison with various AERONET Sun photometers located in the area. In August 2000, the highly absorbing aerosol was the major aerosol component retrieved over the North‐Western part of the SAFARI‐2000 area. AOD values of up to 0.8 and Ångström coefficients of up to 2.1 were observed. Further to the South, the less absorbing type dominated with AOD values of up to 0.3 over the central SAFARI‐2000 area. During September the meteorological situation changed and the high absorbing aerosols were observed further South, due to advective transport of aerosol over a wider area. AOD values were up to 1 with Ångström coefficients similar to those in August. Low absorbing aerosols were observed over a relatively small area. Over the Namibian and Kalahari deserts dust emissions caused high AOD values of up to 0.75 during both months.

show abstract

“…A first attempt was made over the Indian Ocean, using data from the Indian Ocean Experiment (INDOEX). The results show the variation of the mixing ratio with wind fetch over the ocean, from a single industrial aerosol class near the Indian continent to an aerosol class dominated by sea-spray aerosol near the Intertropical Convergence Zone (Robles- Gonzalez et al, 2006). In this paper we present only the spectral AOD and its validation using AERONET data.…”

Section: Tno Dual-view Algorithmmentioning

confidence: 99%

“…The dual-view algorithm has been tested for the retrieval of the AOD and theÅngström parameter over several regions by comparison with AERONET data Robles Gonzalez et al, 2000;Robles Gonzalez et al, 2006). It was developed for the ATSR-2 and has been updated for using AATSR data.…”

Section: Tno Dual-view Algorithmmentioning

confidence: 99%

Comparison of AATSR and SEVIRI aerosol retrievals over the Northern Adriatic

Thomas

Poulsen

Curier

et al. 2007

Q.J.R. Meteorol. Soc.

Self Cite

View full text Add to dashboard Cite

A case-study is presented comparing the Oxford-RAL retrieval of Aerosol and Cloud (ORAC) algorithm, applied to AATSR and Meteosat-8 SEVIRI data, and the dual-view AATSR aerosol retrieval developed at TNO. The study compares data from an AATSR overpass of the Northern Adriatic and Po Valley region on 4 September 2004, during which time there were two AERONET sunphotometer stations operating in the Venice region as part of the ADRIEX campaign.We present the results of a comparison of the optical depth determined from the two AATSR retrievals and the SEVIRI retrieval at the time of the AATSR overpass. The comparison shows that the satellite retrievals consistently overestimate the aerosol optical depth compared to the AERONET site. A possible reason for this over sea is an inability of the algorithms at present to take into account the ocean colour of coastal waters. Future improvements to the algorithms are suggested.

show abstract

Aerosol properties over the Indian Ocean Experiment (INDOEX) campaign area retrieved from ATSR‐2

Cited by 12 publications

References 42 publications

Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops

Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops

Aerosol properties over the SAFARI‐2000 area retrieved from ATSR‐2

Comparison of AATSR and SEVIRI aerosol retrievals over the Northern Adriatic

Contact Info

Product

Resources

About