Preprints
https://doi.org/10.5194/tc-2021-38
https://doi.org/10.5194/tc-2021-38

  03 Mar 2021

03 Mar 2021

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

Deriving Arctic 2 m air temperatures over snow and ice from satellite surface temperature measurements

Pia Nielsen-Englyst1,2, Jacob L. Høyer2, Kristine S. Madsen2, Rasmus T. Tonboe2, Gorm Dybkjær2, and Sotirios Skarpalezos2 Pia Nielsen-Englyst et al.
  • 1Technical University of Denmark (DTU), DK-2800 Kongens Lyngby, Denmark
  • 2Danish Meteorological Institute (DMI), DK-2100 Copenhagen Ø, Denmark

Abstract. The Arctic region is responding heavily to climate change, and yet, the air temperature of ice covered areas in the Arctic is heavily under-sampled when it comes to in situ measurements, resulting in large uncertainties in existing weather- and reanalysis products. This paper presents a method for estimating daily mean clear sky 2 meter air temperatures (T2m) in the Arctic from satellite observations of skin temperature, using the Arctic and Antarctic ice Surface Temperatures from thermal Infrared (AASTI) satellite dataset, providing spatially detailed observations of the Arctic. The method is based on a linear regression model, which has been tuned against in situ observations to estimate daily mean T2m based on clear sky satellite ice surface skin temperatures. The daily satellite derived T2m product includes estimated uncertainties and covers clear sky snow and ice surfaces in the Arctic region during the period 2000–2009, provided on a 0.25 degree regular latitude-longitude grid. Comparisons with independent in situ measured T2m show average biases of 0.30 °C and 0.35 °C and average root mean square errors of 3.47 °C and 3.20 °C for land ice and sea ice, respectively. The associated uncertainties are verified to be very realistic for both land ice and sea ice, using in situ observations. The reconstruction provides a much better spatial coverage than the sparse in situ observations of T2m in the Arctic, is independent of numerical weather prediction model input and it therefore provides an important supplement to simulated air temperatures to be used for assimilation or global surface temperature reconstructions. A comparison between in situ T2m versus T2m derived from satellite and ERA-Interim/ERA5 estimates shows that the T2m derived from satellite observations validate similar or better than ERA-Interim/ERA5 in the Arctic.

Pia Nielsen-Englyst et al.

Status: open (until 28 Apr 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2021-38', Emma Dodd, 09 Mar 2021 reply
  • RC2: 'Comment on tc-2021-38', Christopher J. Merchant, 23 Mar 2021 reply
  • RC3: 'Comment on tc-2021-38', Timo Vihma, 13 Apr 2021 reply

Pia Nielsen-Englyst et al.

Pia Nielsen-Englyst et al.

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Short summary
The Arctic region is responding heavily to climate change, and yet, the air temperature of Arctic, ice covered areas is heavily under-sampled when it comes to in situ measurements. This paper presents a method for estimating daily mean 2 meter air temperatures (T2m) in the Arctic from satellite observations of skin temperature, providing spatially detailed observations of the Arctic. The satellite derived T2m product covers clear sky snow and ice surfaces in the Arctic for the period 2000–2009.