Skip to main content

ESA Data Ontology

Search from vocabulary

Content language

Concept information

Instruments > In Situ/Laboratory Instruments > Spectrometers/Radiometers > SpEx

Preferred term

SpEx  

Definition

  • We introduce a new instrument for the measure-ment of in situ ambient aerosol extinction over the 300–700 nm wavelength range, the spectral aerosol extinction(SpEx) instrument. This measurement capability is envi-sioned to complement existing in situ instrumentation, al-lowing for simultaneous measurement of the evolution ofaerosol optical, chemical, and physical characteristics in theambient environment. In this work, a detailed description ofthe instrument is provided along with characterization testsperformed in the laboratory. Measured spectra of NO2andpolystyrene latex spheres (PSLs) agreed well with theoreti-cal calculations. Good agreement was also found with simul-taneous aerosol extinction measurements at 450, 530, and630 nm using CAPS PMex instruments in a series of 22 testsincluding nonabsorbing compounds, dusts, soot, and blackand brown carbon analogs. SpEx measurements are expectedto help identify the presence of ambient brown carbon dueto its 300 nm lower wavelength limit compared to measure-ments limited to longer UV and visible wavelengths. Ex-tinction spectra obtained with SpEx contain more informa-tion than can be conveyed by a simple power law fit (typ-ically represented by Ångström exponents). Planned futureimprovements aim to lower detection limits and ruggedizethe instrument for mobile operation (en)

Broader concept

Change note

  • 2020-04-14 15:30:51.0 [tstevens] Insert Concept add broader relation (SpEx [337c284f-3158-48e5-8050-5d2744ba77a7,559945] - Spectrometers/Radiometers [ecd58f82-8f96-45e1-9547-dd4a02291bd9,546159]);
  • 2020-04-14 15:31:53.0 [tstevens] insert AltLabel (id: null category: primary text: Spectral Aerosol Extinction language code: en); insert Definition (id: null text: We introduce a new instrument for the measure-ment of in situ ambient aerosol extinction over the 300–700 nm wavelength range, the spectral aerosol extinction(SpEx) instrument. This measurement capability is envi-sioned to complement existing in situ instrumentation, al-lowing for simultaneous measurement of the evolution ofaerosol optical, chemical, and physical characteristics in theambient environment. In this work, a detailed description ofthe instrument is provided along with characterization testsperformed in the laboratory. Measured spectra of NO2andpolystyrene latex spheres (PSLs) agreed well with theoreti-cal calculations. Good agreement was also found with simul-taneous aerosol extinction measurements at 450, 530, and630 nm using CAPS PMex instruments in a series of 22 testsincluding nonabsorbing compounds, dusts, soot, and blackand brown carbon analogs. SpEx measurements are expectedto help identify the presence of ambient brown carbon dueto its 300 nm lower wavelength limit compared to measure-ments limited to longer UV and visible wavelengths. Ex-tinction spectra obtained with SpEx contain more informa-tion than can be conveyed by a simple power law fit (typ-ically represented by Ångström exponents). Planned futureimprovements aim to lower detection limits and ruggedizethe instrument for mobile operation language code: en);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/337c284f-3158-48e5-8050-5d2744ba77a7

Download this concept:

RDF/XML TURTLE JSON-LD Last modified 12/6/20