@prefix ns0: <https://gcmd.earthdata.nasa.gov/kms#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/f21311d0-6788-472b-a315-b130932435c2>
  ns0:reference [ ] ;
  ns0:altLabel [ ] ;
  skos:changeNote """2022-04-18 12:36:25.0 [tstevens]  
insert AltLabel (id: null
category: primary
text: Dual-Beam UV-Absorption Ozone Photometer
language code: en); 
insert Definition (id: null
text: The NOAA-O3 instrument consists of a mercury lamp, two sample chambers that can be periodically scrubbed of ozone, and two detectors that measure the 254-nm radiation transmitted through the chamber. The ozone absorption cross-section at this wavelength is accurately known; hence, the ozone number density can be easily calculated. Since the two absorption chambers are identical, virtually continuous measurements of ozone are made by alternating the ambient air sample and ozone scrubbed sample between the two chambers. At a one-second data collection rate, the minimum detectable concentration of ozone (one standard deviation) is 1.5 x 10 10 molecules/cm 3 (0.6ppbv at STP).
language code: en); 
""", """2022-04-18 12:35:01.0 [tstevens] Insert Concept 
add broader relation (NOAA O3 Classic [f21311d0-6788-472b-a315-b130932435c2,894377] - Photometers [f66daf4f-4d71-49a0-9d3d-205dc7f1faed,886965]); 
""" ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/f66daf4f-4d71-49a0-9d3d-205dc7f1faed> ;
  skos:prefLabel "NOAA O3 Classic"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:definition "The NOAA-O3 instrument consists of a mercury lamp, two sample chambers that can be periodically scrubbed of ozone, and two detectors that measure the 254-nm radiation transmitted through the chamber. The ozone absorption cross-section at this wavelength is accurately known; hence, the ozone number density can be easily calculated. Since the two absorption chambers are identical, virtually continuous measurements of ozone are made by alternating the ambient air sample and ozone scrubbed sample between the two chambers. At a one-second data collection rate, the minimum detectable concentration of ozone (one standard deviation) is 1.5 x 10 10 molecules/cm 3 (0.6ppbv at STP)."@en ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/f66daf4f-4d71-49a0-9d3d-205dc7f1faed>
  skos:prefLabel "Photometers"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/f21311d0-6788-472b-a315-b130932435c2> .