RECOG RL01: correcting GRACE total water storage estimates for global lakes/reservoirs and earthquakes

Autor: Helena Gerdener, Anita Thea Saraswati, Stefan Mayr, Kerstin Schulze, Laurent Longuevergne, Tonie van Dam, Christian Schwatke, Lennart Schawohl, Denise Dettmering, Laura Ellenbeck, Simon Deggim, Igor Klein, Jürgen Kusche, Annette Eicker, Olga Engels
Přispěvatelé: University of Hamburg, Universität Bonn = University of Bonn, University of Luxembourg [Luxembourg], Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), German Aerospace Center (DLR), Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), German Research Foundation (DFG), Luxembourg National Research Fund FOR2630, University of Bonn, Technical University of Munich (TUM), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Deutsches Geodätisches Forschungsinstitut (DGFI-TUM)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
010504 meteorology & atmospheric sciences
0207 environmental engineering
02 engineering and technology
01 natural sciences
03 medical and health sciences
Data assimilation
0302 clinical medicine
Gravitational field
GRACE
GE1-350
Water cycle
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology
020701 environmental engineering
Dynamik der Landoberfläche
0105 earth and related environmental sciences
correction for localized storage changes in lakes/reservoirs
030304 developmental biology
0303 health sciences
QE1-996.5
global terrestrial water storage
Water storage
Geology
6. Clean water
ddc
Environmental sciences
GNSS applications
13. Climate action
Climatology
General Earth and Planetary Sciences
Environmental science
Satellite
Scale (map)
Surface water
030217 neurology & neurosurgery
Zdroj: Earth System Science Data, Vol 13, Pp 2227-2244 (2021)
Earth System Science Data
Earth System Science Data, 2021, 13 (5), pp.2227-2244. ⟨10.5194/essd-13-2227-2021⟩
Earth System Science Data, Copernicus Publications, 2021, 13 (5), pp.2227-2244. ⟨10.5194/essd-13-2227-2021⟩
ISSN: 1866-3516
1866-3508
DOI: 10.5194/essd-13-2227-2021⟩
Popis: Observations of changes in terrestrial water storage obtained from the satellite mission GRACE (Gravity Recovery and Climate Experiment) have frequently been used for water cycle studies and for the improvement of hydrological models by means of calibration and data assimilation. However, due to a low spatial resolution of the gravity field models spatially localized water storage changes, such as those occurring in lakes and reservoirs, cannot properly be represented in the GRACE estimates. As surface storage changes can represent a large part of total water storage, this leads to leakage effects and results in surface water signals becoming erroneously assimilated into other water storage compartments of neighboring model grid cells. As a consequence, a simple mass balance at grid/regional scale is not sufficient to deconvolve the impact of surface water on TWS. Furthermore, non-hydrology related phenomena contained in the GRACE time series, such as the mass redistribution caused by major earthquakes, hamper the use of GRACE for hydrological studies in affected regions. In this paper, we present the first release (RL01) of the global correction product RECOG (REgional COrrections for GRACE), which accounts for both the surface water (lakes & reservoirs, RECOG-LR) and earthquake effects (RECOG-EQ). RECOG-LR is computed from forward-modelling surface water volume estimates derived from satellite altimetry and (optical) remote sensing and allows both a removal of these signals from GRACE and a re-location of the mass change to its origin within the outline of the lakes/reservoirs. The earthquake correction RECOG-EQ includes both the co-seismic and post-seismic signals of two major earthquakes with magnitudes above 9 Mw. We can show that applying the correction dataset (1) reduces the GRACE signal variability by up to 75 % around major lakes and explains a large part of GRACE seasonal variations and trends, (2) avoids the introduction of spurious trends caused by leakage signals of nearby lakes when calibrating/assimilating hydrological models with GRACE, even in neighboring river basins, and (3) enables a clearer detection of hydrological droughts in areas affected by earthquakes. A first validation of the corrected GRACE time series using GPS-derived vertical station displacements shows a consistent improvement of the fit between GRACE and GNSS after applying the correction. Data are made available as open access via the Pangea database (RECOG-LR: Deggim et al. (2020a) https://doi.org/10.1594/PANGAEA.921851; RECOG-EQ: Gerdener et al. (2020b, under revision), https://doi.pangaea.de/10.1594/PANGAEA.921923).
Databáze: OpenAIRE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje