TY  - JOUR
AU  - Mei, Fan
AU  - Wang, Jian
AU  - Comstock, Jennifer M.
AU  - Weigel, Ralf
AU  - Krämer, Martina
AU  - Mahnke, Christoph
AU  - Shilling, John E.
AU  - Schneider, Johannes
AU  - Schulz, Christiane
AU  - Long, Charles N.
AU  - Wendisch, Manfred
AU  - Machado, Luiz A. T.
AU  - Schmid, Beat
AU  - Krisna, Trismono
AU  - Pekour, Mikhail
AU  - Hubbe, John
AU  - Giez, Andreas
AU  - Weinzierl, Bernadett
AU  - Zoeger, Martin
AU  - Pöhlker, Mira L.
AU  - Schlager, Hans
AU  - Cecchini, Micael A.
AU  - Andreae, Meinrat O.
AU  - Martin, Scot T.
AU  - de Sá, Suzane S.
AU  - Fan, Jiwen
AU  - Tomlinson, Jason
AU  - Springston, Stephen
AU  - Pöschl, Ulrich
AU  - Artaxo, Paulo
AU  - Pöhlker, Christopher
AU  - Klimach, Thomas
AU  - Minikin, Andreas
AU  - Afchine, Armin
AU  - Borrmann, Stephan
TI  - Comparison of aircraft measurements during GoAmazon2014/5 and ACRIDICON-CHUVA
JO  - Atmospheric measurement techniques
VL  - 13
IS  - 2
SN  - 1867-8548
CY  - Katlenburg-Lindau
PB  - Copernicus
M1  - FZJ-2020-03171
SP  - 661 - 684
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000514113600001
DO  - DOI:10.5194/amt-13-661-2020
UR  - https://juser.fz-juelich.de/record/884279
ER  -