Index of /L2B

Name	Last modified	Size

Parent Directory		-
v1.0/	2026-01-07 18:16	-
v2.0/	2026-02-18 15:47	-
v3.0/	2026-02-20 08:46	-
v4.0/	2026-03-19 09:28	-
HISTORY.txt	2026-03-19 09:03	1.3K
LICENSE.txt	2026-02-10 21:13	2.3K
README.html	2026-03-19 10:19	4.9K
v4.0.zip	2026-03-19 10:15	35G

Welcome to the TU Delft Level-2B GRACE/GRACE-FO Equivalent Water Height (EWH) data repository. This archive provides versioned, uncertainty-aware gridded gravity products designed for hydrology, cryosphere, sea-level, and data-assimilation applications.

All datasets are derived from official GRACE and GRACE-FO Level-2 spherical harmonic solutions and are processed consistently to provide both signal estimates and a transparent, multi-component uncertainty decomposition.

This dataset provides gridded Equivalent Water Height (EWH), which are equivalent on land to Terrestrial Water Storage Anomalies (TWSA) from GRACE and GRACE-FO generated at TU Delft (“TUD”), filtered using the DDK{i} (i=2,...,7) decorrelation filter (Kusche et al., 2009) on a 0.5° × 0.5° global grid. Each file contains monthly fields from 2002–2020. All weighted mean and uncertainty components include gravity signal content from degree 2 to 60. Weights are computed as the normalised square inverses of open-ocean RMS using COST-G RL02.1 (Meyer, U. et al., 2025) monthly solutions as a benchmark. Coefficients C20 and C30 are already replaced using TN-14v3 (https://doi.org/10.1029/2019GL085488). The user can add the geocenter motion (TN-13) contribution (degree-1) separately, as well as remove prominent tidal components (S2, P1, S1, K1, and unmodelled R3), which can be found in the ancillary product TUD-L2B-EWH_CLIM-GRACE and for v4 in TUD-L2B-EWH_CLIM_CORR-GRACE.

The novelty in this product is the consolidation of multiple official GRACE Level-2 spherical harmonic solutions and their uncertainty propagation into a single multi-component uncertainty budget, which includes:
(1) the GIA trend (Bagge, M. et al. 2023),

(2) AOD1B (based on AOe07) (Shihora, L. et al. 2024),

(3) ensemble solution uncertainty (includes effects of parametrisation, and ocean tide models),

(4) filtering leakage (Dobslaw, H. et al. 2020), with finally

(5) degree-1 uncertainty (Swenson, S., D. Chambers, and J. Wahr, 2008).

Repository overview

v1.0/
First public release of the Level-2B EWH product.
Release date: 06 January 2026
v2.0/
Updated release including methodological improvements and corrections to the uncertainty propagation for filtering-induced leakage. Added residuals to climatological fit and propagated C20, C30 and degree-1 coefficients.
Release date: 27 January 2026
v3.0/
Updated release including "noSLR" dataset, and uncertainties in climatological fit models.
Release date: February 2026
v4.0/
1. Added fully post-processed (GIA, SLR, degree-1, aliasing removed) EWH called "ewh_mean_corr". 2. Added reconstructed geophysical climatological signal "ewh_mean_clim" in CLIM data product. 3. Added reconstructed tidal aliasing climatological signal "ewh_mean_tides" in CLIM data product. 4. Added CLIM_CORR data product containing full climatological signals as CLIM.
Recommended for new scientific use.
Release date: March 2026
CLIM/
Ancillary post-processing products, including climatological fits and aliasing-tide coefficients used to remove long-term trends, seasonal variability, and known GRACE(-FO) aliasing signals.
CLIM_LEAKAGE/
Ancillary post-processing products, including climatological fits and aliasing-tide coefficients used to remove long-term trends, seasonal variability, and known GRACE(-FO) aliasing signals related to the leaked signal.
HISTORY.txt
History of data product versions and changes/updates.
LICENSE.txt
Licensing information governing use, redistribution, and citation of the data.

Each version directory is fully self-contained and can be used independently. Users are strongly encouraged to explicitly reference the version number (e.g. v3.0 or v4.0) when using these data in scientific publications.

Index of /L2B_UNC

TUD-L2B-EWH_UNC-GRACE

Repository overview