So #GSTM18 came to an end. I've seen a lot of great talks, and I keep being amazed that after all those years, there is still so much to learn from GRACE data. Let's hope for the best, next week when the redundant unit on GFO2 is switched on.
November 7, 2024 at 3:38 PM
So #GSTM18 came to an end. I've seen a lot of great talks, and I keep being amazed that after all those years, there is still so much to learn from GRACE data. Let's hope for the best, next week when the redundant unit on GFO2 is switched on.
Oceanographic ocean bottom pressure signals are low in amplitude, quick but large in extent. Jennifer Bonin shows that GRACE can inform the dealiasing background model at submonthly scales. #GSTM18
November 7, 2024 at 3:38 PM
Oceanographic ocean bottom pressure signals are low in amplitude, quick but large in extent. Jennifer Bonin shows that GRACE can inform the dealiasing background model at submonthly scales. #GSTM18
Jordan Meyer shows that GRACE is picking up transport changes in the meridional overturning circulation by comparing with data form the RAPID ocean bottom pressure array. #GSTM18
November 7, 2024 at 3:38 PM
Jordan Meyer shows that GRACE is picking up transport changes in the meridional overturning circulation by comparing with data form the RAPID ocean bottom pressure array. #GSTM18
Extracting ocean mass from GRACE is not as trivial as it appears. Uncertainties in GIA modelling introduce large errors. Furthermore, care must be taking to correctly restore the dealising product as incorrectly doing so makes your trend too large. Bernd Uebbing #GSTM18
November 7, 2024 at 3:38 PM
Extracting ocean mass from GRACE is not as trivial as it appears. Uncertainties in GIA modelling introduce large errors. Furthermore, care must be taking to correctly restore the dealising product as incorrectly doing so makes your trend too large. Bernd Uebbing #GSTM18
Daily variations of the *time derivative* from the new ITSG-GRACE2018 release show that it is picking up submonthly signals also seen by reanalysis models. @annette_ei
#GSTM18
#GSTM18
November 7, 2024 at 3:48 PM
Daily variations of the *time derivative* from the new ITSG-GRACE2018 release show that it is picking up submonthly signals also seen by reanalysis models. @annette_ei
#GSTM18
#GSTM18
GRACE data supports the hypothesis that during wet periods in South Sudan, aquifers in the northern Dakhla subbasin are partly replenished by subsurface flow forced by increased levels in e.g. lake Nasser. #GSTM18 Talk by Himanshu Save on behalf of Karem Abdelmohsen
November 7, 2024 at 3:48 PM
GRACE data supports the hypothesis that during wet periods in South Sudan, aquifers in the northern Dakhla subbasin are partly replenished by subsurface flow forced by increased levels in e.g. lake Nasser. #GSTM18 Talk by Himanshu Save on behalf of Karem Abdelmohsen
Laura Jensen explains the challenges of comparing coupled climate models with GRACE. Where are the hydrological drying and wettening hotspots where the models see similar signals as GRACE? #GSTM18 @annette_ei
November 7, 2024 at 3:48 PM
Laura Jensen explains the challenges of comparing coupled climate models with GRACE. Where are the hydrological drying and wettening hotspots where the models see similar signals as GRACE? #GSTM18 @annette_ei
Groundwater extraction causes subsidence overlaid on a smaller elastic uplift. @susannawerth shows that during the recent drought in the Central Valley the groundwater change from InSar and GRACE is roughly consistent but elastic loading methods do create differences. #GSTM18
November 7, 2024 at 3:48 PM
Groundwater extraction causes subsidence overlaid on a smaller elastic uplift. @susannawerth shows that during the recent drought in the Central Valley the groundwater change from InSar and GRACE is roughly consistent but elastic loading methods do create differences. #GSTM18
Assimilation of GRACE into hydrological models may not only help in seeing droughts which are missed by the model, but also aid in evaluating false positives in the models. Ongoing work from @HGerdener presented by @engels_olga #GSTM18
November 7, 2024 at 3:48 PM
Assimilation of GRACE into hydrological models may not only help in seeing droughts which are missed by the model, but also aid in evaluating false positives in the models. Ongoing work from @HGerdener presented by @engels_olga #GSTM18
Considering a catchment, one may wonder how much water is potentially available for draining through river-runoff. Comparing GRACE derived total water storage with river discharge observations gives a rough estimate of ~1800 km^3 for the Amazon basin. Nico Sneeuw #GSTM18
November 7, 2024 at 3:48 PM
Considering a catchment, one may wonder how much water is potentially available for draining through river-runoff. Comparing GRACE derived total water storage with river discharge observations gives a rough estimate of ~1800 km^3 for the Amazon basin. Nico Sneeuw #GSTM18
Mascons solutions usually require model corrections from Glacial Isostatic Adjustment(GIA), and model surface loads. @engels_olga shows that the underlying GIA may be also estimated using a 'patch' approach @remriva #GSTM18
November 7, 2024 at 3:48 PM
Mascons solutions usually require model corrections from Glacial Isostatic Adjustment(GIA), and model surface loads. @engels_olga shows that the underlying GIA may be also estimated using a 'patch' approach @remriva #GSTM18
Erik Ivins suggests that GRACE may provide clues on deep Earthquakes and therefore water in the mantle. GRACE appears to show some post-seismic signal from the deep 2013 earthquake in the Sea of Okhotsk, but location of anomalies are somewhat shifted. #GSTM18
November 7, 2024 at 3:48 PM
Erik Ivins suggests that GRACE may provide clues on deep Earthquakes and therefore water in the mantle. GRACE appears to show some post-seismic signal from the deep 2013 earthquake in the Sea of Okhotsk, but location of anomalies are somewhat shifted. #GSTM18
Shin-Chan Han explains that post-seismic relaxation after the 2009 Samoa Earthquake increased the subsidence rate in American Samoa up to 5 times the global sea level rate. Viscosity of the post-seismic model has been constrained with GRACE and GPS data. #GSTM18
November 7, 2024 at 3:48 PM
Shin-Chan Han explains that post-seismic relaxation after the 2009 Samoa Earthquake increased the subsidence rate in American Samoa up to 5 times the global sea level rate. Viscosity of the post-seismic model has been constrained with GRACE and GPS data. #GSTM18
Realistically incorporating dealiasing model error in the gravity field retrieval may actually help in extracting more information from the LRI. #GSTM18 Talk by Andreas Kvas
November 7, 2024 at 3:48 PM
Realistically incorporating dealiasing model error in the gravity field retrieval may actually help in extracting more information from the LRI. #GSTM18 Talk by Andreas Kvas
An ongoing challenge is the realistic representation of the errors introduced by tides, and the dealiasing/background models in the inversion schemes. Torsten Mayer-Gürr shows that actual GRACE residuals can now be well explained by a closed-loop simulator. #GSTM18
November 7, 2024 at 3:48 PM
An ongoing challenge is the realistic representation of the errors introduced by tides, and the dealiasing/background models in the inversion schemes. Torsten Mayer-Gürr shows that actual GRACE residuals can now be well explained by a closed-loop simulator. #GSTM18
Over the course of a day, the groundtrack of GRACE still allows swaths of mascons to be updated. Himanshu Save shows how this can be used to create daily gravity solutions featuring submonthly ocean and flooding features. #GSTM18
November 7, 2024 at 3:48 PM
Over the course of a day, the groundtrack of GRACE still allows swaths of mascons to be updated. Himanshu Save shows how this can be used to create daily gravity solutions featuring submonthly ocean and flooding features. #GSTM18
Although varying GRACE solutions are based on the same data, some of the differences can be modelled as noise and combining them may yield better gravity fields. Ulrich Meyer presents combinations strategies in the framework of the @ISSIBern Cost-G initiative #GSTM18
November 7, 2024 at 3:48 PM
Although varying GRACE solutions are based on the same data, some of the differences can be modelled as noise and combining them may yield better gravity fields. Ulrich Meyer presents combinations strategies in the framework of the @ISSIBern Cost-G initiative #GSTM18
Jean-Michel Lemoine shares an empirical 4-parameter model which links temperature changes to accelerometer biases. FYI the newest CNES/GRGS release has number RL04, so don't confuse this with the RL04 from the official processing centers #GSTM18
November 7, 2024 at 3:48 PM
Jean-Michel Lemoine shares an empirical 4-parameter model which links temperature changes to accelerometer biases. FYI the newest CNES/GRGS release has number RL04, so don't confuse this with the RL04 from the official processing centers #GSTM18
Saniya Behzadpour gives an insight into the es ITSG-grace2018 gravity solutions, reduced ocean noise likely due to coestimation of ocean tides and antenna phase center modelling #GSTM18
November 7, 2024 at 3:48 PM
Saniya Behzadpour gives an insight into the es ITSG-grace2018 gravity solutions, reduced ocean noise likely due to coestimation of ocean tides and antenna phase center modelling #GSTM18
Since 2011, the thermal regulation in GRACE has been switched off to increase the mission lifetime. Himanshu Save shows that this changes the estimated accelerometer scale factors after 2011. #GSTM18
November 7, 2024 at 3:48 PM
Since 2011, the thermal regulation in GRACE has been switched off to increase the mission lifetime. Himanshu Save shows that this changes the estimated accelerometer scale factors after 2011. #GSTM18
Accelerometer series from GRACE sometimes show spurious non-linear temperature dependencies. Rebecca McGirr from @anuearthscience that empirical mode decomposition may aid in removing some of these effects. #GSTM18 @P_Tregoning_ANU
November 7, 2024 at 3:48 PM
Accelerometer series from GRACE sometimes show spurious non-linear temperature dependencies. Rebecca McGirr from @anuearthscience that empirical mode decomposition may aid in removing some of these effects. #GSTM18 @P_Tregoning_ANU
LRI has much lower noise in the high frequencies, so this may open up some new applications relative to the microwave instrument #GSTM18
November 7, 2024 at 3:48 PM
LRI has much lower noise in the high frequencies, so this may open up some new applications relative to the microwave instrument #GSTM18