In:
Atmospheric Measurement Techniques, Copernicus GmbH, Vol. 13, No. 2 ( 2020-02-11), p. 661-684
Kurzfassung:
Abstract. The indirect effect of atmospheric aerosol particles on the
Earth's radiation balance remains one of the most uncertain components
affecting climate change throughout the industrial period. The large
uncertainty is partly due to the incomplete understanding of aerosol–cloud
interactions. One objective of the GoAmazon2014/5 and the ACRIDICON
(Aerosol, Cloud, Precipitation, and Radiation Interactions and Dynamics of
Convective Cloud Systems)-CHUVA (Cloud Processes of the Main Precipitation
Systems in Brazil) projects was to understand the influence of emissions from the tropical
megacity of Manaus (Brazil) on the surrounding atmospheric environment of
the rainforest and to investigate its role in the life cycle of convective
clouds. During one of the intensive observation periods (IOPs) in the dry
season from 1 September to 10 October 2014, comprehensive measurements of
trace gases and aerosol properties were carried out at several ground sites.
In a coordinated way, the advanced suites of sophisticated in situ
instruments were deployed aboard both the US Department of Energy
Gulfstream-1 (G1) aircraft and the German High Altitude and Long-Range
Research Aircraft (HALO) during three coordinated flights on 9 and 21 September
and 1 October. Here, we report on the comparison of measurements
collected by the two aircraft during these three flights. Such comparisons
are challenging but essential for assessing the data quality from the
individual platforms and quantifying their uncertainty sources. Similar
instruments mounted on the G1 and HALO collected vertical profile
measurements of aerosol particle number concentrations and size
distribution, cloud condensation nuclei concentrations, ozone and carbon
monoxide mixing ratios, cloud droplet size distributions, and downward solar
irradiance. We find that the above measurements from the two aircraft agreed
within the measurement uncertainties. The relative fraction of the aerosol
chemical composition measured by instruments on HALO agreed with the
corresponding G1 data, although the total mass loadings only have a good
agreement at high altitudes. Furthermore, possible causes of the
discrepancies between measurements on the G1 and HALO are examined in this
paper. Based on these results, criteria for meaningful aircraft measurement
comparisons are discussed.
Materialart:
Online-Ressource
ISSN:
1867-8548
DOI:
10.5194/amt-13-661-2020
DOI:
10.5194/amt-13-661-2020-supplement
Sprache:
Englisch
Verlag:
Copernicus GmbH
Publikationsdatum:
2020
ZDB Id:
2505596-3
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