Preprints
https://doi.org/10.5194/tc-2022-71
https://doi.org/10.5194/tc-2022-71
 
12 Apr 2022
12 Apr 2022
Status: this preprint is currently under review for the journal TC.

Brief communication: Improving ERA5-Land soil temperature in permafrost regions using an optimized multi-layer snow scheme

Bin Cao1, Gabriele Arduini2, and Ervin Zsoter2,3 Bin Cao et al.
  • 1National Tibetan Plateau Data Center (TPDC), State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China
  • 2European Centre for Medium-Range Weather Forecasts, Reading, UK
  • 3Department of Geography and Environmental Science, University of Reading, Reading, UK

Abstract. We previously reported a notable warm bias in ERA5-Land soil temperature in permafrost regions that was supposedly being caused by an underestimation of the snow density. In this study, we implemented and evaluated a new multi-layer snow scheme in the land surface scheme of ERA5-Land, i.e., HTESSEL, with revised snow densification parametrizations. We compared permafrost soil temperatures from the numerical experiments with observations and the original ERA5-Land with a single layer snow scheme. The revised HTESSEL significantly improved the representation of soil temperature in permafrost regions compared to ERA5-Land. The daily warm bias in winter was reduced by about 0.6–3.0 °C, and the resulting modelled near-surface permafrost extent was improved (11.0–12.9 × 106 km2), comparing reasonably with observed estimates for continuous and discontinuous permafrost areas. We therefore suggest that a better-resolved snow scheme with a multi-layer snow profile should be included in next-generation reanalyses as a first step towards improving the representation of permafrost.

Bin Cao et al.

Status: open (until 07 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-71', Anonymous Referee #1, 15 Apr 2022 reply
    • AC1: 'Reply on RC1', Bin Cao, 03 May 2022 reply
  • RC2: 'Comment on tc-2022-71', Anonymous Referee #2, 07 May 2022 reply

Bin Cao et al.

Bin Cao et al.

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Latest update: 24 May 2022
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Short summary
We implemented a new multi-layer snow scheme in the land surface scheme of ERA5-Land with revised snow densification parametrizations. The revised HTESSEL improved the representation of soil temperature in permafrost regions compared to ERA5-Land, especially warm bias in winter was significantly reduced and the resulting modelled near-surface permafrost extent was improved.