Mass balance of the Greenland ice sheet from GRACE and surface mass balance modelling

Nichol, Janet, Zou, Fang, Tenzer, Robert and Fok, Hok Sum (2020) Mass balance of the Greenland ice sheet from GRACE and surface mass balance modelling. Water, 12 (7). a1847. ISSN 0310-0367

[img] PDF - Accepted Version
Available under License Creative Commons Attribution.

Download (948kB)

Abstract

The Greenland Ice Sheet (GrIS) is losing mass at a rate that represents a major contribution to global sea-level rise in recent decades. In this study, we used GRACE data to retrieve the time series variations of the GrIS from April 2002 to June 2017. We also estimate the mass balance from the RACMO2.3 and ice discharge data in order to obtain a comparative analysis and cross-validation. A detailed analysis of long-term trend, seasonal and inter-annual changes of the GrIS is implemented by GRACE and surface mass balance (SMB) modeling. The results indicate a decrease of -267.77±8.68 Gt/yr of the GrIS over the 16-year period. There is a rapid decline from 2002-2008, which even accelerated from 2009 to 2012, before declining relatively slowly from 2013 to 2017. The mass change inland is significantly smaller than that detected along coastal regions, especially in southeastern, southwestern, and northwestern regions. The mass balance estimates from GRACE and SMB-D are highly consistent. The ice discharge manifests itself mostly as a long-term trend, whereas seasonal mass variations are largely attributed to surface mass processes. The GrIS mass changes are mostly attributed to mass loss during summer. Summer mass changes are highly correlated with climate changes.

Item Type: Article
Keywords: GRACE, Greenland, glacier melting, climate change
Schools and Departments: School of Global Studies > Geography
Related URLs:
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 29 Jun 2020 18:42
Last Modified: 30 Jun 2020 07:00
URI: http://sro.sussex.ac.uk/id/eprint/92203

View download statistics for this item

📧 Request an update