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Clear evidence for the impact of wildfire smoke on cirrus formation

Authors

Ansmann,  Albert
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ohneiser,  Kevin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Engelmann,  Ronny
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Seifert,  Patric
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mamouri,  Rodanthi-Elisavet
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ene,  Dragos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nisantzi,  Argyro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Ansmann, A., Ohneiser, K., Engelmann, R., Seifert, P., Mamouri, R.-E., Ene, D., Nisantzi, A. (2023): Clear evidence for the impact of wildfire smoke on cirrus formation, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0554


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016966
Abstract
From 27 October to 1 November 2020 we observed aged wildfire smoke layers from 10-11.5 km height with a multiwavelength Raman lidar at Limassol, Cyprus, continuously over 6 days. Aged smoke particles consist mainly of organic material. On all days, ice nucleation occurred just above the base of the smoke layer at temperatures around -50°C. The ice crystals grew fast and formed strong virga in clean air below the smoke layers. The observed smoke and cirrus features clearly indicates where the ice nucleation occurred. During the MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) expedition the German icebreaker Polarstern with a multiwavelength Raman lidar aboard drifted through the pack ice at latitudes from 85°-88.5°N from October 2019 to March 2020. During this period a wildfire smoke layer originating from record-breaking Siberian fires in the summer of 2019 and cirrus layers were continuously observed with the our lidar and a cloud radar of the ARM mobile facility in the upper troposphere and lower stratosphere (UTLS) from 7-17 km height. In this smoke layer, the evolution of more than 50 cirrus systems were monitored in the North Pole region within this 6-month period. We will discuss ice nucleation processes over Cyprus and the North Pole region. In the case of MOSAiC, the discussion is based on derived smoke ice nucleating particle concentrations and ice crystal number concentrations obtained from the combined lidar-radar studies.