Preliminary GNET-derived mass variations for Greenland
Data files
Apr 19, 2024 version files 244.30 KB
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GMB_GNET_detrended_daily_2002-2022.txt
228.55 KB
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GMB_GNET_detrended_monthly_2002-2022.txt
7.45 KB
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GMB_GRACE_GAC_DTU_052023_detrended_2002-2022.txt
5.82 KB
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README.md
2.48 KB
Abstract
Monitoring the Greenland mass balance (GMB) is crucial in the context of global sea level rise. Currently, three main methods are used to measure GMB, with the primary source of uncertainty arising from the glacial isostatic adjustment (GIA) contribution. Here, we propose a novel approach based on a simple methodology that uses the entire Greenland GNSS network (GNET) as an instrument to monitor the present-day mass changes. Our method is validated against GRACE-derived GMB, and we find a very good agreement. This leads to an independent methodology for estimating present-day mass changes from GNSS, bridging the gap between GRACE and GRACE-FO in GMB estimates.
README: Preliminary GNET-derived mass variations for Greenland
The Greenland mass balance (GBM) is an estimate of mass variations (ice melting) occurring in Greenland. GMB can be estimated with different techniques. GRACE-derived GMB is estimated from the monthly time series from the GRACE and GRACE-FO gravimetry satellites, according to the methodology from ESA CCI (Barletta et al., 2020).
The GNET-based GMB is obtained as described in "GNET derived Mass Balance and Glacial Isostatic Adjustment Constraints for Greenland" by Valentina R. Barletta, Andrea Bordoni, and Shfaqat Abbas Khan. It is based on the analysis of GNSS time series from 58 stations of the Greenland GNSS-Network (GNET) described in Khan et al. (2016), which can be found in Berg et al. (2023) https://doi.org/10.5061/dryad.9zw3r22n0
The GNET-GMB should be considered preliminary, and should not be used as it in any application. It is computed at daily and monthly resolution, with the atmosphere and oceanic contributions not removed by the gravimetry and GNSS datasets.
Description of the data and file structure
This folder contains 3 files that are used to produce Fig.1g in the manuscript
"GNET derived Mass Balance and Glacial Isostatic Adjustment Constraints for Greenland"
by Valentina R. Barletta, Andrea Bordoni, and Shfaqat Abbas Khan
- GMB_GNET_detrended_daily_2002-2022.txt It contains the detrended daily GMB derived from the rescaled uplift of the GNET stations. The file has a self-explanatory header. The columns represent: Epoch in calendar years GMB in giga tons (Gt) Associated GMB error in Gt Number of GNSS stations used to estimate the GMB
- GMB_GNET_detrended_monthly_2002-2022.txt It contains the detrended monthly GMB derived from the rescaled uplift of the GNET stations. The file has a self-explanatory header. The columns represent: Epoch in calendar years GMB in giga tons (Gt) Associated GMB error in Gt
- GMB_GRACE+GAC_DTU_052023_detrended_2002-2022.txt It contains the detrended monthly GMB derived from GRACE RL06 and GRACE-FO RL06.1 plus the GAC product. The file has a self-explanatory header. The columns represent: Epoch in calendar years GMB in giga tons (Gt) Associated GMB error in Gt
Note that all the above products contain the atmospheric and ocean contribution.