04 Jan 2022

04 Jan 2022

Review status: this preprint is currently under review for the journal ESSD.

EUREC4A observations from the SAFIRE ATR42 aircraft

Sandrine Bony1, Marie Lothon2, Julien Delanoë3, Pierre Coutris4, Jean-Claude Etienne5, Franziska Aemisegger6, Anna Lea Albright1, Thierry André8, Hubert Bellec8, Alexandre Baron7, Jean-François Bourdinot8, Pierre-Etienne Brilouet2,5, Aurélien Bourdon8, Jean-Christophe Canonici8, Christophe Caudoux3, Patrick Chazette7, Michel Cluzeau8, Céline Cornet9, Jean-Philippe Desbios8, Dominique Duchanoy8, Cyrille Flamant10, Benjamin Fildier11, Christophe Gourbeyre4, Laurent Guiraud8, Tetyana Jiang8, Claude Lainard8, Christophe Le Gac3, Christian Lendroit8, Julien Lernould8, Thierry Perrin8, Frédéric Pouvesle8, Pascal Richard5, Nicolas Rochetin11, Kevin Salaün8, Alfons Schwarzenboeck4, Guillaume Seurat8, Bjorn Stevens12, Julien Totems7, Ludovic Touzé-Peiffer1, Gilles Vergez8, Jessica Vial1, Leonie Villiger6, and Raphaela Vogel1 Sandrine Bony et al.
  • 1LMD/IPSL, Sorbonne Université, CNRS, Paris, France
  • 2Laboratoire d’Aérologie, University of Toulouse, CNRS, Toulouse, France
  • 3LATMOS/IPSL, Université Paris-Saclay, UVSQ, Guyancourt, France
  • 4LAMP, Université Clermont Auvergne, CNRS, Clermont-Ferrand, France
  • 5CNRM, University of Toulouse, Météo-France, CNRS, Toulouse, France
  • 6Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
  • 7LSCE/IPSL, CNRS-CEA-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France
  • 8SAFIRE, Météo-France, CNRS, CNES, Cugnaux, France
  • 9LOA, Université de Lille, CNRS, Lille, France
  • 10LATMOS/IPSL, Sorbonne Université, CNRS, Paris, France
  • 11LMD/IPSL, École Normale Supérieure, CNRS, Paris, France
  • 12Max Planck Institute for Meteorology, Hamburg, Germany

Abstract. As part of the EUREC4A (Elucidating the role of cloud-circulation coupling in climate) field campaign, which took place in January and February 2020 over the western tropical Atlantic near Barbados, the French SAFIRE ATR42 research aircraft conducted 19 flights in the lower troposphere. Each flight followed a common flight pattern that sampled the atmosphere around the cloud-base level, at different heights of the subcloud layer, near the sea surface and in the lower free troposphere. The aircraft's payload included a backscatter lidar and a Doppler cloud radar that were both horizontally oriented, a Doppler cloud radar looking upward, microphysical probes, a cavity ring-down spectrometer for water isotopes, a multiwavelength radiometer, a visible camera and multiple meteorological sensors, including fast rate sensors for turbulence measurements. With this instrumentation, the ATR characterized the macrophysical and microphysical properties of trade-wind clouds together with their thermodynamical, turbulent and radiative environment. This paper presents the airborne operations, the flight segmentation, the instrumentation, the data processing and the EUREC4A datasets produced from the ATR measurements. It shows that the ATR measurements of humidity, wind and cloud-base cloud fraction measured with different techniques and samplings are internally consistent, that meteorological measurements are consistent with estimates from dropsondes launched from an overflying aircraft (HALO), and that water isotopic measurements are well correlated with data from the Barbados Cloud Observatory. This consistency demonstrates the robustness of the ATR measurements of humidity, wind, cloud-base cloud fraction and water isotopic composition during EUREC4A. It also confirms that through their repeated flight patterns, the ATR and HALO measurements provided a statistically consistent sampling of trade-wind clouds and of their environment. The ATR datasets are freely available at the locations specified in Table 11.

Sandrine Bony et al.

Status: open (until 01 Mar 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Sandrine Bony et al.

Data sets

SAFIRE ATR42 - EUREC4A: GOES satellite movies for ATR flights Fildier, B., Touzé-Peiffer, L., & Schulz, H.

SAFIRE ATR42 - EUREC4A: ALiAS aerosol products data Chazette, P.

SAFIRE ATR42 - EUREC4A: ALiAS cloud products data Chazette, P.

SAFIRE ATR42 - EUREC4A: SAFIRE-TURB dataset Lothon, M., & Brilouet, P.-E.

SAFIRE ATR42 - EUREC4A: ALiAS basic data Chazette, P.

SAFIRE ATR42 - EUREC4A: PICARRO dataset Aemisegger, F., Dütsch, M., Rösch, M., & Villiger, L.

SAFIRE ATR42 - EUREC4A: BASTALIAS L2 dataset Chazette, P., Bony, S., & Delanoë, J.

SAFIRE ATR42 - EUREC4A: RASTA L2 dataset Caudoux, C., Bony, S., & Delanoë, J.

SAFIRE ATR42 - EUREC4A: BASTA L2 dataset Le Gac, C., Bony, S., & Delanoë, J.

SAFIRE ATR42 - EUREC4A: PMA/CDP-2 dataset Coutris, P., & Schwarzenboeck, A.

SAFIRE ATR42 - EUREC4A: UHSAS dataset Coutris, P., & Ehses, G.

SAFIRE ATR42 - EUREC4A: PMA/CloudComposite dataset Coutris, P.

SAFIRE ATR42 - EUREC4A: PMA/2D-S dataset Coutris, P., & Schwarzenboeck, A.




SAFIRE ATR42 - EUREC4A: SAFIRE-CORE dataset CNRM/TRAMM, SAFIRE, & Laboratoire d'Aérologie

SAFIRE ATR42 - EUREC4A: Flights segments Bony, S., Brilouet, P.-E., & Aemisegger, F.

Sandrine Bony et al.


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Short summary
The French ATR42 research aircraft took part in the international field campaign EUREC4A that took place in 2020 over the tropical Atlantic east of Barbados. We present the extensive instrumentation of the aircraft, the research flights and the different measurements. We show that the ATR measurements of humidity, wind, aerosols and cloudiness in the lower atmosphere are robust and consistent with each other. They will make it possible to advance the understanding of cloud-climate interactions.