Preprints
https://doi.org/10.5194/essd-2021-293
https://doi.org/10.5194/essd-2021-293

  23 Sep 2021

23 Sep 2021

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

A 30 year monthly 5 km gridded surface elevation time series for the Greenland Ice Sheet from multiple satellite radar altimeters

Baojun Zhang1,, Zemin Wang1,, Jiachun An1, Tingting Liu1, and Hong Geng2 Baojun Zhang et al.
  • 1Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan, 430079, China
  • 2School of Resource and Environment Science, Wuhan University, Wuhan, 430079, China
  • These authors contributed equally to this work.

Abstract. A long-term time series of ice sheet surface elevation change (SEC) is important for study of ice sheet variation and its response to climate change. In this study, we used an updated plane-fitting least-squares regression strategy to generate a 30 year surface elevation time series for the Greenland Ice Sheet (GrIS) at monthly temporal resolution and 5 × 5 km grid spatial resolution using ERS‐1, ERS‐2, Envisat, and CryoSat‐2 satellite radar altimeter observations obtained between August 1991 and December 2020. The accuracy and reliability of the time series are effectively guaranteed by application of sophisticated corrections for intermission bias and interpolation based on empirical orthogonal function reconstruction. Validation using both airborne laser altimeter observations and the European Space Agency GrIS Climate Change Initiative (CCI) product indicated that our merged surface elevation time series is reliable. The accuracy and dispersion of errors of SECs of our results were 19.3 % and 8.9 % higher, respectively, than those of CCI SECs, and even 30.9 % and 19.0 % higher, respectively, in periods from 2006–2010 to 2010–2014. Further analysis showed that our merged time series could provide detailed insight into GrIS SEC on multiple temporal (up to 30 years) and spatial scales, thereby providing opportunity to explore potential associations between ice sheet change and climatic forcing. The merged surface elevation time series data are available at http://dx.doi.org/10.11888/Glacio.tpdc.271658 (Zhang et al., 2021).

Baojun Zhang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-293', Anonymous Referee #1, 22 Oct 2021
  • RC2: 'Comment on essd-2021-293', Anonymous Referee #2, 10 Nov 2021
  • RC3: 'Comment on essd-2021-293', Anonymous Referee #3, 16 Nov 2021

Baojun Zhang et al.

Data sets

Surface elevation time series over the Greenland Ice Sheet (1991-2020) Baojun Zhang, Zemin Wang, Jiachun An, Tingting Liu, Hong Geng https://doi.org/10.11888/Glacio.tpdc.271658

Baojun Zhang et al.

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Short summary
A long-term time series of ice sheet surface elevation change essential for assessing climate change. This study presents a 30 year monthly 5 km gridded surface elevation time series for the Greenland Ice Sheet from multiple satellite radar altimeters. The dataset can provide detailed insight into Greenland Ice Sheet surface elevation change on multiple temporal and spatial scales, thereby providing opportunity to explore potential associations between ice sheet change and climatic forcing.