News

June, 2023 – New paper of Congo Basins’s freshwater resources

The newly published paper of Mohammad J. Tourian and its co-authors informs about the current availability and distribution of the Congo Basins’s freshwater resources which ensure the survival of about 120 million people.

April, 2023 – EGU

Several GlobalCDA members are off to the EGU General Assembly 2023! Join us for a chance to learn, network, and have a great time. Don’t miss out our presentations:

• Tuesday, 25.4.
  – H. M. Hasan et al. (2023): Multi-variable Pareto optimal calibration of the global hydrological model WaterGAP for 1500 major drainage basins around the globe, EGU23-11245. HS2.5.1, Poster, 10:45-12:30, Hall A / A.28
  – K. Schulze et al. (2023): Calibration of a global hydrological model while simultaneously assimilating satellite-derived total water storage anomalies and in-situ streamflow observations, EGU23-11733. HS2.5.1, Oral, 17:25-17:35, Room 2.15.
• Wednesday, 26.4.
  S.-M. Hosseini-Moghari and P. Döll (2023): Using observation data to improve simulation of man-made reservoirs in a global hydrological model, EGU23-9951. HS2.5.2, PICO, 8:30-10:15, PICO spot 4 / PICO4.7
• Thursday, 27.4.
  D. Scherer et al. (2023): IRIS: Global River Surface Slopes from ICESat-2, EGU23-8652. HS6.4, Poster, 8:30-10:15, Hall A / A.86
• Friday, 28.4.
  – H. Gerdener et al. (2023): The global land water storage data set GLWS 2.0: assimilating GRACE and GRACE-FO into a global hydrological model, EGU23-5086. G3.1, Oral, 11:15-11:25, Room 0.11/12
  – C. Schwatke et al. (2023).: High-resolution water surface slope of Polish rivers from two decades of multi-mission satellite altimetry measurements, EGU23-11956. G6.1, Oral, 15:30-15:40, Room 0.11/12.

April, 2023 – Water loss in Germany

A newly published paper shows that Germany lost about 760 million tons of water per year within the last 20 years. Scientists (including several GlobalCDA team members) used GRACE and GRACE-FollowOn satellite data to investigate the water loss.
The following figure shows the temporal variations of the total water storage over Germany, with the large seasonal variations (summer vs. winter) already removed. We can see that in particular the recend dry years affect the trend.

Press releases were published (in German) by the GFZ and the University of Bonn.

March, 2023

Mohammad Tourian will provide a talk at the 2. ICCC online Workshop on “Geodesy for Climate Research” (28.-29.3.2023) on Wednesday, 29.3.2023, at 8:00am CEST about the “Current availability and distribution of Congo Basin’s freshwater resources”. Information about registration, participation, and the whole workshop program are available on the ICCC website.

October, 2022

We thank Dr. Heye Bogena for providing a great and extremely interesting excursion for our ECRs to the Wüstebachtal research area belonging to TERENO.

July, 2022

We are excited to announce that the paper “Revising precipitation – water storages – vegetation signatures with GRACE-based data assimilation” by Helena Gerdener et al. was published in the Journal of Hydrology. It is freely accessible here until August 20.

June, 2022

Prof. Petra Döll will provide a talk about continental water on Wednesday, 29.06.2022, in Hannover, Germany, as part of the lecture series “The Changing Earth“. Registration is possible until Friday, 24.06.2022.

May, 2022

We are pleased to announce the publication of the review paper “Remote Sensing of Surface Water Dynamics in the Context of Global Change – A Review” by Patrick Sogno et al. Check it out. The full citation is available here.

We are happy to contribute to the many different conferences. Please check out our contributions. The full citations can be found here.

• 1st International Water Summit, Sde Boker, Israel
  Talk on Sun, 22 May
  – P. Döll: Global-scale quantification of drought hazards and risks: Selection of indicators for a global drought early warning system
• EGU General Assembly, Vienna, Austria (and online) – short oral presentations
  Wed, 25 May
  – 15:22 CEST: G. Guillet and T. Bolch: Probabilistic estimation of glacier surface elevation changes from DEM differentiation: a Bayesian method for outlier filtering, gap filling and uncertainty estimation with examples from High Mountain Asia (EGU22-10073) in the session CR2.2
  – 17.54 CEST: K.-H. Hsu et al.: Estimating groundwater storage changes for major river basins in France using a regional groundwater data set (EGU22-7127) in the session HS2.5.3
  Thu, 26 May
  – 10:41 CEST: J. Kusche et al.: How robust are estimates of hydrology-driven global mean sea level change based on modelling and GRACE data (EGU22-4091) in the session CL3.1.1
  Fri, 27 May
  – 8:30 CEST: D. Scherer et al.: Estimating Water Surface Slope of Rivers Using ICESat-2 Observations (EGU22-4110) in the session HS6.3
  – 9:03 CEST: K. Schulze et al.: Joint assimilation of GRACE Total Water Storage Anomalies and In-Situ Streamflow Data into a Global Hydrological Model (EGU22-5321) in the session HS2.5.1
  – 10:47 CEST: M. Hasan et al.: Improved groundwater simulations by multi-criteria calibration of a global hydrological model in the river basins of France (EGU22-7384) in the session HS8.2.11
  – 11:19 CEST: H. Gerdener et al.: Modeled water – vegetation dynamics under revision using GRACE-based data assimilation (EGU22-6981) in the session HS2.5.1
• ESA Living Planet Symposium, Bonn, Germany
  Talk on Mon, 23 May (3:10pm-3:20pm in the Plenary room)
  – J. Kusche:  Quantum Missions for Climate: Accelerating space solutions for a green future
  Posters on Thu, 26 May (5.20pm-7pm)
  – O. Elmi et al.: Spaceborne river discharge from a nonparametric stochastic quantile mapping function
  – H. Gerdener et al.: Using GRACE-based assimilation for the revision of modeled water – vegetation dynamics
  – K. Schulze et al.: Enhancing hydrological model output by joint satellite data assimilation
  – C. Schwatke et al.: DAHITI – Next generation of water level time series of inland waters
  – M. J. Tourian et al.: Estimation of inter-satellite and inter-track biases of satellite altimetry missions over lakes and reservoirs using surface area from satellite imagery
  Posters on Fri, 27 May (12:20pm-2pm)
  – O. Elmi and M. J. Tourian: Global dynamic river masks from Landsat imagery

April, 2022

We congratulate Prof. Petra Döll for receiving the German Hydrology Award 2022 from the German Hydrological Society and becoming an honorary member.

October, 2021

Helena Gerdener introduces the new 0.5° global land water storage (GLWS) data set based on GRACE and GRACE-FO data assimilation at the GRACE-FO Science Team Meeting (13.10.2021 at 6.20pm CET).

June, 2021

Prof. Jürgen Kusche provides a public talk about the GlobalCDA research unit and some results at the Geodetic Colloquium at IGG, Uni Bonn (June 10 at 16:15 CEST). Everybody is most welcome to join. Please find all relevant Zoom information at this link.

April, 2021

• 26.-30.04.2021: We are happy to contribute to the EGU online conference. Please check out our contributions. The full citations can be found here.
  Mon, 26 April
  – 15.47 CEST: S. Mayr et al.: Uncertainty Estimation for a Global Inland Surface Water Time-Series (EGU2021-6399) in the session HS3.3
  Thu, 29 April
  – 9.09 CEST: K.-H. Hsu et al.: Using high-resolution groundwater data for the validation of a global hydrological model: evaluating WaterGAP and calibration/data assimilation (C/DA) performance over France (EGU21-1317) in the session HS2.5.1
  – 9.21 CEST: K. Schulze et al.: Joint assimilation of GRACE satellite and in-situ discharge observations into a global hydrological model (EGU21-7511) in the session HS2.5.1
  – 9.28 CEST: A.T. Saraswati et al.: Surface deformations observed by GPS and its relation to groundwater variations in France (EGU21-15146) in the session G3.1

October, 2020

• 22.10.2020: We are happy that the new paper of Deggim et al. (2021) is submitted and is currently under review for the journal ESSD. The paper is a joint effort of many GlobalCDA members and introduces two public GRACE level-3 correction data sets that may be useful for hydrology data assimilation, drought assessment, climate model validation, GIA inversion, etc.

July, 2020

• 30.07.2020: The new paper of Müller-Schmied et al. (2021) is published describing the newest WaterGAP mode version 2.2d which is used by the GlobalCDA research unit.

• 30.04.2019: It is our honor that two GlobalCDA principal investigators (PI) are recipients of the EGU Division Medals of 2019. Prof. Petra Döll has been awarded the Henry Darcy Medal and Prof. Tonie van Dam has been awarded the Vening Meinesz Medal.

October, 2018

• 18.10.2018: Recipients of the EGU Division Medals of 2019
  It is our honor that two GlobalCDA principal investigators (PI) are recipients of the EGU Division Medals of 2019. Prof. Petra Döll has been awarded the Henry Darcy Medal and Prof. Tonie van Dam has been awarded the Vening Meinesz Medal. They will receive their prizes at the EGU 2019 General Assembly, which will take place in Vienna on 7–12 April 2019.

December, 2017

• 15.12.2017: Agreement of GlobalCDA Project from the DFG