Preprints
https://doi.org/10.5194/essd-2021-341
https://doi.org/10.5194/essd-2021-341

  03 Nov 2021

03 Nov 2021

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

Observations of marine cold-air outbreaks: A comprehensive data set of airborne and dropsonde measurements from the Springtime Atmospheric Boundary Layer Experiment (STABLE)

Janosch Michaelis1, Amelie U. Schmitt2, Christof Lüpkes1, Jörg Hartmann1, Gerit Birnbaum1, and Timo Vihma3,4 Janosch Michaelis et al.
  • 1Alfred-Wegener-Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
  • 2Meteorological Institute, Center for Earth System Research and Sustainability (CEN), Universität Hamburg, Hamburg, Germany
  • 3Finnish Meteorological Institute, Helsinki, Finland
  • 4The University Centre in Svalbard, Longyearbyen, Norway

Abstract. In March 2013, the Springtime Atmospheric Boundary Layer Experiment (STABLE) was carried out in the region of Fram Strait and over Svalbard to investigate atmospheric convection and boundary layer modifications due to interactions between sea ice, atmosphere, and open water. A major goal was the observation of marine cold-air outbreaks (MCAOs), which are typically characterised by a transport of very cold air masses from the ice-covered ocean over a relatively warm water surface, and which often affect local and regional weather conditions. During STABLE, such MCAOs were observed on four days within a period of a strongly northward shifted sea ice edge north of Svalbard and thus with an unusually large Whaler's Bay Polynya. The observations mainly consisted of in situ measurements from airborne instruments and of measurements by dropsondes. Here, we present the corresponding data set from, in total, 15 aircraft vertical profiles and 22 dropsonde releases. Besides an overview on flight patterns and instrumentation, we provide a detailed presentation of the individual quality-processing mechanisms, which ensure that the data can be used, for example, for model validation. A few remarks are also given on data quality and on some characteristics of the MCAOs based on the quality-processed data. All 37 data series are published in the World Data Center PANGAEA (Lüpkes et al., 2021a, https://doi.pangaea.de/10.1594/PANGAEA.936635).

Janosch Michaelis et al.

Status: open (until 29 Dec 2021)

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  • RC1: 'Comment on essd-2021-341', Anonymous Referee #1, 02 Dec 2021 reply

Janosch Michaelis et al.

Data sets

Airborne and dropsonde measurements in MCAOs during STABLE in March 2013 Lüpkes, Christof; Hartmann, Jörg; Schmitt, Amelie U; Birnbaum, Gerit; Vihma, Timo; Michaelis, Janosch https://doi.pangaea.de/10.1594/PANGAEA.936635

Janosch Michaelis et al.

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Short summary
A major goal of the aircraft campaign Springtime Atmospheric Boundary Layer Experiment (STABLE) was to observe atmospheric conditions during marine cold-air outbreaks (MCAOs) originating from the sea ice covered Arctic ocean. Quality-controlled measurements of several meteorological variables collected during 15 vertical aircraft profiles and by 22 dropsondes are presented. The comprehensive data set may be used for validating model results to improve the understanding of future trends of MCAOs.