In:
Atmospheric Measurement Techniques, Copernicus GmbH, Vol. 11, No. 8 ( 2018-08-14), p. 4737-4756
Kurzfassung:
Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA)
was operated on board the German High Altitude and Long Range Research
Aircraft (HALO) during the PGS (POLSTRACC/GW-LCYCLE/SALSA) aircraft campaigns
in the Arctic winter 2015/2016. Research flights were conducted from 17
December 2015 until 18 March 2016 within 25–87∘ N,
80∘ W–30∘ E. From the GLORIA infrared limb-emission
measurements, two-dimensional cross sections of temperature, HNO3,
O3, ClONO2, H2O and CFC-12 are retrieved. During 15
scientific flights of the PGS campaigns the GLORIA instrument measured
more than 15 000 atmospheric profiles at high spectral resolution. Dependent on flight altitude and
tropospheric cloud cover, the profiles retrieved from the measurements typically range between 5 and
14 km, and vertical resolutions between 400 and 1000 m are achieved. The estimated total (random and
systematic) 1σ errors are in the range of 1 to 2 K for temperature and 10 % to 20 % relative
error for the discussed trace gases. Comparisons to in situ instruments deployed on board HALO have been
performed. Over all flights of this campaign the median differences and median absolute deviations between
in situ and GLORIA observations are -0.75K±0.88 K for temperature, -0.03ppbv±0.85 ppbv for
HNO3, -3.5ppbv±116.8 ppbv for O3, -15.4pptv±102.8 pptv for ClONO2, -0.13ppmv±0.63 ppmv for H2O and -19.8pptv±46.9 pptv for CFC-12. Seventy-three percent of these differences are
within twice the combined estimated errors of the cross-compared instruments.
Events with larger deviations are explained by atmospheric variability and
different sampling characteristics of the instruments. Additionally,
comparisons of GLORIA HNO3 and O3 with measurements of the
Aura Microwave Limb Sounder (MLS) instrument show highly consistent
structures in trace gas distributions and illustrate the potential of the
high-spectral-resolution limb-imaging GLORIA observations for resolving
narrow mesoscale structures in the upper troposphere and lower stratosphere
(UTLS).
Materialart:
Online-Ressource
ISSN:
1867-8548
DOI:
10.5194/amt-11-4737-2018
DOI:
10.5194/amt-11-4737-2018-supplement
Sprache:
Englisch
Verlag:
Copernicus GmbH
Publikationsdatum:
2018
ZDB Id:
2505596-3
