Preprints
https://doi.org/10.5194/wcd-2021-22
https://doi.org/10.5194/wcd-2021-22

  10 May 2021

10 May 2021

Review status: this preprint was under review for the journal WCD but the revision was not accepted.

A 25-year climatology of low-tropospheric temperature and humidity inversions for contrasting synoptic regimes at Neumayer Station, Antarctica

Tiago Silva1,2 and Elisabeth Schlosser1,3 Tiago Silva and Elisabeth Schlosser
  • 1Department of Atmospheric and Cryospheric Sciences, University of Innsbruck, Innsbruck, Austria
  • 2Department of Geography and Regional Science, University of Graz, Graz, Austria
  • 3Austrian Polar Research Institute, Vienna, Austria

Abstract. A 25-year set of daily radiosonde data was used to investigate temperature and humidity inversions at Neumayer Station, coastal Dronning Maud Land, Antarctica. For the first time, inversions were studied differentiating between different synoptic conditions and different height levels. It was shown that, generally, inversions occurred on the majority (78 %) of the days, with simultaneous occurrence of humidity and temperature inversions being observed on approximately two thirds of all days. Multiple inversions are common in all seasons for both weather conditions, however, typically occur more frequently under cyclonic conditions. The seasonality of inversion occurrence and features, i.e. inversions strength, depth and vertical gradients, was analysed statistically. Different formation mechanisms depending on inversion levels and prevailing weather situations are related to typical annual courses of certain inversion features. Winter maxima were found for the features that are mostly connected to the temperature close to the surface, which is mainly a result of the negative energy balance, thus influencing surface-based inversions. At the second level, both temperature and humidity inversions are often caused by advection of comparably warm and moist air masses related to the passage of cyclones and their frontal systems. Thus maxima in several inversion features are found in spring and fall, when cyclonic activity is strongest. Monthly mean profiles of humidity and temperature inversions reveal that elevated inversions are often obscured in average profiles due to large variations in inversion height and depth.

Tiago Silva and Elisabeth Schlosser

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wcd-2021-22', Anonymous Referee #1, 11 May 2021
    • CC1: 'Reply on RC1', Elisabeth Schlosser, 11 May 2021
    • AC1: 'Reply on RC1', Tiago Silva, 20 Aug 2021
  • RC2: 'Comment on wcd-2021-22', Anonymous Referee #2, 13 Jul 2021
    • AC2: 'Reply on RC2', Tiago Silva, 20 Aug 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wcd-2021-22', Anonymous Referee #1, 11 May 2021
    • CC1: 'Reply on RC1', Elisabeth Schlosser, 11 May 2021
    • AC1: 'Reply on RC1', Tiago Silva, 20 Aug 2021
  • RC2: 'Comment on wcd-2021-22', Anonymous Referee #2, 13 Jul 2021
    • AC2: 'Reply on RC2', Tiago Silva, 20 Aug 2021

Tiago Silva and Elisabeth Schlosser

Tiago Silva and Elisabeth Schlosser

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Short summary
For the first time, a 25-yr climatology of temperature and humidity inversions for Neumayer Station, Antarctica, was presented that takes into account different levels of inversion occurrence and different weather situations. Distinct differences in inversion features and formation mechanisms were found depending on inversion level and weather situation. These findings will increase our understanding of the polar boundary layer and improve the current paleoclimatic interpretation of ice cores.