Preprints
https://doi.org/10.5194/acp-2021-39
https://doi.org/10.5194/acp-2021-39

  07 Apr 2021

07 Apr 2021

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

Variability of Black Carbon mass concentration in surface snow at Svalbard

Michele Bertò1,a, David Cappelletti2,7, Elena Barbaro1,3, Cristiano Varin1, Jean-Charles Gallet4, Krzysztof Markowicz5, Anna Rozwadowska6, Mauro Mazzola7, Stefano Crocchianti2, Luisa Poto1,3, Paolo Laj8, Carlo Barbante1,3, and Andrea Spolaor1,2 Michele Bertò et al.
  • 1Ca’ Foscari University of Venice, Dept. Environmental Sciences, Informatics and Statistics, via Torino, 155 - 30172 Venice-Mestre, Italy
  • 2Università degli Studi di Perugia, Dipartimento di Chimica, Biologia e Biotecnologie, Perugia, Italy
  • 3CNR-ISP, Institute of Polar Science – National Research Council – via Torino, 155 - 30172 Venice-Mestre, Italy
  • 4Norwegian Polar Institute, Tromsø, Norway
  • 5University of Warsaw, Institute of Geophysics, Warsaw, Poland
  • 6Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland
  • 7CNR-ISP, Institute of Polar Science – National Research Council – Via Gobetti 101, Bologna
  • 8Univ. Grenoble-Alpes, CNRS, IRD, Grenoble-INP, IGE, 38000 Grenoble, France
  • anow at: Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland

Abstract. Black Carbon (BC) is a significant forcing agent in the Arctic, but substantial uncertainty remains to quantify its climate effects due to the complexity of the different mechanisms involved, in particular related to processes in the snow-pack after deposition. In this study, we provide detailed and unique information on the evolution and variability of BC content in the upper surface snow layer during the spring period in Svalbard (Ny-Ålesund). Two different snow-sampling strategies were adopted during spring 2014 and 2015, providing the refractory BC (rBC) mass concentration variability on a seasonal/daily and daily/hourly time scales. The present work aims to identify which atmospheric variables could interact and modify the mass concentration of BC in the upper snowpack, the snow layer which BC particles affects the snow albedo. Despite the low BC mass concentrations, a relatively high daily variability was observed. Atmospheric, meteorological, and snow-related physico-chemical parameters were considered in a multiple statistical model to separate the factors determining observations. Precipitation events were the main drivers of the BC variability. Snow metamorphism and activation of local sources during the snow melting periods appeared to play a non-negligible role (wind resuspension in specific Arctic areas where coal mines were present). The BC content in the snow resulted in being statistically decoupled from the atmospheric BC load.

Michele Bertò et al.

Status: open (until 02 Jun 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-39', Anonymous Referee #1, 08 Apr 2021 reply

Michele Bertò et al.

Michele Bertò et al.

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Short summary
We present the daily and seasonal variability of Black carbon in surface snow inferred from two specific experiment based on the hourly and daily time resolution sampling during the Arctic spring in Svalbard. These unique datasets give us for the first time the opportunity to evaluate the associations between the observed surface snow BC mass concentration and a set of predictors corresponding to the considered meteorological and snow physico-chemical parameters.
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