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Preprints
https://doi.org/10.5194/essd-2019-259
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2019-259
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  02 Jun 2020

02 Jun 2020

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A revised version of this preprint is currently under review for the journal ESSD.

The Berkeley Earth Land/Ocean Temperature Record

Robert A. Rohde1 and Zeke Hausfather1,2 Robert A. Rohde and Zeke Hausfather
  • 1Berkeley Earth, Berkeley, CA 94705, USA
  • 2Breakthrough Institute, Oakland, CA 94612, USA

Abstract. A global land/ocean temperature record has been created by combining the Berkeley Earth monthly land temperature field with spatially-kriged version of the HadSST3 dataset. This combined product spans the period from 1850 to present and covers the majority of the Earth's surface: approximately 57 % in 1850, 75 % in 1880, 95 % in 1960, and 99.9 % by 2015. It includes average temperatures in 1° × 1° lat/lon grid cells for each month when available. It agrees quite well with records from Hadley's HadCRUT4, NASA's GISTEMP, NOAA's GlobalTemp, and Cowtan and Way, but provides a more spatially complete and homogeneous temperature field. Two versions of the record are provided treating areas with sea ice cover as either air temperature over sea ice or sea surface temperature under sea ice. The choice of how to assess the temperature of areas with sea ice coverage has a notable impact on global anomalies over past decades due to rapid warming of air temperatures in the Arctic. Accounting for rapid warming of Arctic air suggests ~ 0.1 °C additional global-average temperature rise since the 19th century than temperature series that do not capture the changes in the Arctic. Updated versions of this dataset will be presented each month at the Berkeley Earth website (http://berkeleyearth.org/data/), and a convenience copy of the version discussed in this paper has been archived and is freely available at https://doi.org/10.5281/zenodo.3634713 (Rohde & Hausfather, 2020).

Robert A. Rohde and Zeke Hausfather

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Robert A. Rohde and Zeke Hausfather

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Berkeley Earth Combined Land and Ocean Temperature Field, Jan 1850-Nov 2019 R. A. Rohde and Z. Hausfather https://doi.org/10.5281/zenodo.3634713

Robert A. Rohde and Zeke Hausfather

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Short summary

A global land/ocean temperature record was created by combining the Berkeley Earth monthly land temperature field with an interpolated version of the HadSST3 ocean dataset. The resulting dataset covers the period 1850 to present.

This paper describes the methods used to create that combination, and compares the results to other estimates of global temperature and the associated recent climate change, giving similar results.

A global land/ocean temperature record was created by combining the Berkeley Earth monthly land...

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