12 May 2021

12 May 2021

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

JOANNE : Joint dropsonde Observations of the Atmosphere in tropical North atlaNtic meso-scale Environments

Geet George1, Bjorn Stevens1, Sandrine Bony2, Robert Pincus3,4, Chris Fairall4, Hauke Schulz1, Tobias Kölling1, Quinn T. Kalen5,, Marcus Klingebiel6,, Heike Konow7,, Ashley Lundry5,, Marc Prange8,9,, and Jule Radtke8,9, Geet George et al.
  • 1Max Planck Institute for Meteorology, Hamburg, Germany
  • 2LMD/IPSL, Sorbonne University, CNRS, Paris, France
  • 3Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
  • 4NOAA Physical Sciences Laboratory, Boulder, Colorado, USA
  • 5NOAA Aircraft Operation Center, Lakeland, Florida, USA
  • 6Institute for Meteorology, University Leipzig, Leipzig, Germany
  • 7Meteorological Institute, Universität Hamburg, Hamburg, Germany
  • 8Meteorological Institute, Center for Earth System Research and Sustainability, Universität Hamburg, Hamburg, Germany
  • 9International Max Planck Research School on Earth System Modelling, Max Planck Institute for Meteorology, Hamburg, Germany
  • These authors contributed equally to this work.

Abstract. As part of the EUREC4A field campaign which took place over the tropical North Atlantic during January–February 2020, 1216 dropsondes from the HALO and WP-3D aircraft were deployed through 26 flights to characterize the thermodynamic and dynamic environment of clouds in the trade-wind regions. We present JOANNE (Joint dropsonde Observations of the Atmosphere in tropical North atlaNtic meso-scale Environments), the dataset that contains these dropsonde measurements and the products derived from them. Along with the raw measurement profiles and basic post-processing of pressure, temperature, relative humidity and horizontal winds, the dataset also includes a homogenized and gridded data set with 10 m vertical spacing. The gridded data are used as a basis for deriving diagnostics of the area-averaged meso-scale circulation properties such as divergence, vorticity, vertical velocity and gradient terms, making use of sondes dropped at regular intervals along a circular flight path. 85 such circles, ~222 km in diameter, were flown during EUREC4A. We describe the sampling strategy for dropsonde measurements during EUREC4A, the quality control for the data, the methods of estimation of additional products from the measurements and the different post-processed levels of the dataset. The dataset is publicly available ( as is the software used to create it (

Geet George et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-162', Anonymous Referee #1, 26 May 2021
  • RC2: 'Comment on essd-2021-162', Anonymous Referee #2, 09 Jun 2021
  • AC1: 'Response to reviewers' comments on essd-2021-162', Geet George, 11 Aug 2021

Geet George et al.

Data sets

JOANNE : Joint dropsonde Observations of the Atmosphere in tropical North atlaNtic meso-scale Environments Geet George, Bjorn Stevens, Sandrine Bony, Robert Pincus, Chris Fairall, Hauke Schulz, Tobias Kölling, Quinn T. Kalen, Marcus Klingebiel, Heike Konow, Ashley Lundry, Marc Prange, Jule Radtke

Model code and software

JOANNE (Joint dropsonde Observations of the Atmosphere in tropical North atlaNtic meso-scale Environments) software (Version v1.0.0) Geet George

Geet George et al.


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Short summary
Dropsondes measure atmospheric parameters such as temperature, pressure, humidity and horizontal winds. The EUREC4A field campaign deployed 1216 dropsondes during January–February, 2020 in the north Atlantic trade-wind region in order to characterize the thermodynamic and the dynamic structure of the atmosphere, primarily at horizontal scales of ~200 km. We present JOANNE, the dataset that provides these dropsonde measurements and thereby a rich characterization of the trade-wind atmosphere.