{"type": "FeatureCollection", "features": [{"id": "10261/401848", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:24:42Z", "type": "Journal Article", "created": "2025-07-11", "title": "Characterization of filter photometer artifacts in soot and dust measurements \u2013 laboratory and ambient experiments using a traceably calibrated aerosol absorption reference", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>Abstract. A novel reference absorption instrument based on photothermal interferometry \u2013 the dual-wavelength photothermal aerosol absorption monitor PTAAM-2\u03bb \u2013 and scattering measurements are used to characterize filter photometer artifacts in measurements of absorption coefficients of soot- and dust-dominated aerosol samples within laboratory and ambient campaigns. We provide, for different aerosol types, reference values of the multiple-scattering parameter, quantifying the artifact introduced by the interaction between the light, the particles, and the filter. The Aethalometer AE33 and the Continuous Light Absorption Photometer (CLAP) were characterized during a laboratory campaign where different soot and mineral dust samples were measured. Furthermore, ambient measurements during a campaign in Granada, Spain, were used to characterize the AE33 and MAAP (Multiangle Absorption Photometer), a pseudo-reference absorption instrument. The laboratory campaign showed significant wavelength dependence of the calibration parameter, the multiple-scattering parameter C. The C of the AE33 at 450 and 808\u2009nm was 4.08 and 3.95 and 6.25 and 5.27 for propane soot and diesel soot, respectively. For the CLAP, the C was 5.10 and 4.26 and 6.79 and 5.80 for propane and diesel soot, respectively. For the different mineral dust samples analyzed in the laboratory, the C at 450\u2009nm ranged between 2.74 and 3.03 for the AE33 and between 2.50 and 2.80 for the CLAP. The ambient measurements at Granada showed an overall C of 4.72 at 450\u2009nm and of 3.90 at 808\u2009nm for the AE33. The results for both the AE33 and the CLAP show a dependence with the particle size, with fine particles having the highest C values and with the C being reduced and leveling off for larger particles. Both the laboratory and the ambient measurements of the AE33 showed overlapping results. The cross-sensitivity to scattering was smaller for the CLAP than for the AE33. The values of the cross-sensitivity parameter ms at 450 and 808\u2009nm were 3.0\u2009% and 1.5\u2009% for the AE33 and 2.4\u2009% and 0.9\u2009% for the CLAP. The intercomparison of the MAAP with the PTAAM-2\u03bb during the ambient campaign in Granada showed that the MAAP overestimates the absorption coefficients for 47\u2009% at 637\u2009nm and features a cross-sensitivity to scattering of 2.4\u2009%.</p></article>", "keywords": ["Make cities and human settlements inclusive", " safe", " resilient and sustainable", "Take urgent action to combat climate change and its impacts", "Build resilient infrastructure", " promote inclusive and sustainable industrialization and foster innovation", "Earthwork. Foundations", "TA715-787", "Environmental engineering", "http://metadata.un.org/sdg/13", "http://metadata.un.org/sdg/3", "TA170-171", "Aerosol absorption", "http://metadata.un.org/sdg/11", "http://metadata.un.org/sdg/9", "Ensure healthy lives and promote well-being for all at all ages"]}, "links": [{"href": "https://amt.copernicus.org/articles/18/3073/2025/amt-18-3073-2025.pdf"}, {"href": "https://doi.org/10261/401848"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Atmospheric%20Measurement%20Techniques", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10261/401848", "name": "item", "description": "10261/401848", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10261/401848"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2025-02-24T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Aerosol+absorption&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Aerosol+absorption&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Aerosol+absorption&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Aerosol+absorption&offset=1", "hreflang": "en-US"}], "numberMatched": 1, "numberReturned": 1, "distributedFeatures": [], "timeStamp": "2026-07-26T21:14:37.706876Z"}