EGU24-3945, updated on 08 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

GTWS-MLrec: global terrestrial water storage reconstruction by machine learning from 1940 to present

Jiabo Yin1, Louise Slater2, Abdou Khouakhi3, Pan Liu1, Yadu Pokhrel4, Dedi Liu1, and Pierre Gentine5
Jiabo Yin et al.
  • 1Wuhan University, Wuhan, China (
  • 2University of Oxford, Oxford, UK (
  • 3Cranfield Environment Centre, Cranfield University, Cranfield, UK (
  • 4Michigan State University, East Lansing, MI, USA (
  • 5Columbia University, New York, NY, USA (pg2328@columbia.ed)

Terrestrial water storage (TWS) includes all forms of water stored on and below the land surface, and is a key determinant of global water and energy budgets. However, TWS data from measurements by the Gravity Recovery and Climate Experiment (GRACE) satellite mission are only available from 2002, limiting global and regional understanding of the long-term trends and variabilities in the terrestrial water cycle under climate change. This study presents long-term (i.e., 1940-2022) and relatively high-resolution (i.e., 0.25°) monthly time series of TWS anomalies over the global land surface. The reconstruction is achieved by using a set of machine learning models with a large number of predictors, including climatic and hydrological variables, land use/land cover data, and vegetation indicators (e.g., leaf area index). The outcome, machine learning-reconstructed TWS estimates (i.e., GTWS-MLrec), fits well with the GRACE/GRACE-FO measurements, showing high correlation coefficients and low biases in the GRACE era. We also evaluate GTWS-MLrec with other independent products such as the land-ocean mass budget, atmospheric and terrestrial water budget in 341 large river basins, and streamflow measurements at 10,168 gauges. The results show that our proposed GTWS-MLrec performs overall as well as or is more reliable than previous TWS datasets. Moreover, our reconstructions successfully reproduce the consequences of climate variability, such as strong El Niño events. GTWS-MLrec dataset consists of three reconstructions based on JPL, CSR and GSFC mascons, three detrended and de-seasonalized reconstructions, and six global average TWS series over land areas, both with and without Greenland and Antarctica. Along with its extensive attributes, GTWS_MLrec can support a wide range of geoscience applications such as better understanding the global water budget, constraining and evaluating hydrological models, climate-carbon coupling, and water resources management.

GTWS-MLrec is available on Zenodo through

How to cite: Yin, J., Slater, L., Khouakhi, A., Liu, P., Pokhrel, Y., Liu, D., and Gentine, P.: GTWS-MLrec: global terrestrial water storage reconstruction by machine learning from 1940 to present, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-3945,, 2024.

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