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  Measurement of NOx and NOy with a thermal dissociation cavity ring-down spectrometer (TD-CRDS): instrument characterisation and first deployment

Friedrich, N., Tadic, I., Schuladen, J., Brooks, J., Darbyshire, E., Drewnick, F., et al. (2020). Measurement of NOx and NOy with a thermal dissociation cavity ring-down spectrometer (TD-CRDS): instrument characterisation and first deployment. Atmospheric Measurement Techniques, 13(10), 5739-5761. doi:10.5194/amt-13-5739-2020.

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 Urheber:
Friedrich, Nils1, Autor           
Tadic, Ivan1, Autor           
Schuladen, Jan1, Autor           
Brooks, James, Autor
Darbyshire, Eoghan, Autor
Drewnick, Frank2, Autor           
Fischer, Horst1, Autor           
Lelieveld, Jos1, Autor           
Crowley, John N.1, Autor           
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
2Particle Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              

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 Zusammenfassung: We present a newly constructed, two-channel ther-
mal dissociation cavity ring-down spectrometer (TD-CRDS)
for the measurement of NOx (NO + NO2), NOy (NOx
+
HNO3
+RO2NO2
+2N2O5 etc.), NOz (NOy
−NOx) and par-
ticulate nitrate (pNit). NOy-containing trace gases are de-
tected as NO2 by the CRDS at 405 nm following sampling
through inlets at ambient temperature (NOx) or at 850

C
(NOy). In both cases, O3 was added to the air sample di-
rectly upstream of the cavities to convert NO (either am-
bient or formed in the 850

C oven) to NO2. An activated
carbon denuder was used to remove gas-phase components
of NOy when sampling pNit. Detection limits, defined as
the 2σ precision for 1 min averaging, are 40 pptv for both
NOx and NOy. The total measurement uncertainties (at 50 %
relative humidity, RH) in the NOx and NOy channels are
11%+10 pptv and 16%+14 pptv for NOz respectively. Ther-
mograms of various trace gases of the NOz family confirm
stoichiometric conversion to NO2 (and/or NO) at the oven
temperature and rule out significant interferences from NH3
detection (< 2 %) or radical recombination reactions under
ambient conditions. While fulfilling the requirement of high
particle transmission (> 80 % between 30 and 400 nm) and
essentially complete removal of reactive nitrogen under dry
conditions (> 99 %), the denuder suffered from NOx break-
through and memory effects (i.e. release of stored NOy) un-
der humid conditions, which may potentially bias measure-
ments of particle nitrate.
Summertime NOx measurements obtained from a ship
sailing through the Red Sea, Indian Ocean and Arabian Gulf
(NOx levels from < 20 pptv to 25 ppbv) were in excellent
agreement with those taken by a chemiluminescence detec-
tor of NO and NO2. A data set obtained locally under vastly
different conditions (urban location in winter) revealed large
diel variations in the NOz to NOy ratio which could be at-
tributed to the impact of local emissions by road traffic.

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Sprache(n): eng - English
 Datum: 2020-10-29
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.5194/amt-13-5739-2020
 Art des Abschluß: -

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Titel: Atmospheric Measurement Techniques
  Kurztitel : AMT
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Göttingen : European Geosciences Union, Copernicus
Seiten: - Band / Heft: 13 (10) Artikelnummer: - Start- / Endseite: 5739 - 5761 Identifikator: ISSN: 1867-1381
CoNE: https://pure.mpg.de/cone/journals/resource/1867-1381