A.1 | GRACE-FO Project Status

A.1

GRACE-FO Project Status
Orals
| Tue, 08 Oct, 09:00–12:20 (CEST)|Lecture Hall, Building H
Orals
Tue, 09:00
The meeting will open with a GRACE-FO Project Status session consisting of the technical status of the mission and the flight segment, future science operations plans as well as information on the latest GRACE/GRACE-FO data releases from the Science Data System.

Orals: Tue, 8 Oct | Lecture Hall, Building H

09:00–09:10
Welcome & Opening Remarks
09:10–09:35
|
GSTM2024-94
|
On-site presentation
|
GRACE-FO: science results, mission status and outlook 
Felix Landerer, Frank Flechtner, Himanshu Save, Chris McCullough, Christoph Dahle, Srinivas Bettadpur, Robert Gaston, Krzystof Snopek, and John T Reager

Since 2018, the GRACE Follow-On satellite mission, a partnership between NASA (US) and GFZ (Germany), is continuing the unique essential climate data record of mass change across the Earth system initiated in 2002 by the GRACE mission (2002-2017). The combined GRACE & GRACE-FO data records now span over 22 years and provide foundational observations of monthly to decadal global mass changes and transports in the Earth system derived from temporal variations in the Earth’s gravity field. These observations have become indispensable for climate-related studies that enable process understanding of the evolving global water cycle, including ocean dynamics, polar ice mass changes, and near-surface and global ground water changes.

In this presentation, we will present recent GRACE/GRACE-FO science and applications highlights, new data processing, calibration approaches, the improvements and performance of the recently released new RL06.3 data version, and discuss the GRACE-FO mission plan to operate and collect high-quality science data through the peaking solar cycle 25, aiming for continuity with the upcoming NASA/DLR GRACE-Continuity mission, targeted to launch in late 2028.

How to cite: Landerer, F., Flechtner, F., Save, H., McCullough, C., Dahle, C., Bettadpur, S., Gaston, R., Snopek, K., and Reager, J. T.: GRACE-FO: science results, mission status and outlook, GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-94, https://doi.org/10.5194/gstm2024-94, 2024.

09:35–09:50
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GSTM2024-90
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On-site presentation
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GRACE-FO Mission Operations Report   
Krzysztof Snopek, Mona Witkowski, and Sebastian Loew

In this presentation the status of the GRACE-FO mission and the flight segment will be given.

How to cite: Snopek, K., Witkowski, M., and Loew, S.: GRACE-FO Mission Operations Report  , GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-90, https://doi.org/10.5194/gstm2024-90, 2024.

09:50–10:05
|
GSTM2024-97
|
On-site presentation
GRACE-FO: Science Operation Management Report   
Himanshu Save

A summary of operations activites will be presented with a focus on the future plans that allows for maintaining good quality of science products. 

How to cite: Save, H.: GRACE-FO: Science Operation Management Report  , GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-97, https://doi.org/10.5194/gstm2024-97, 2024.

10:05–10:25
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GSTM2024-96
|
On-site presentation
GRACE and GRACE-FO Level-1 V04 Data Processing Status 
Christopher Mccullough, William Bertiger, Carmen Blackwood, Sung Byun, Eugene Fahnestock, Christopher Finch, Nate Harvey, Felix Landerer, Mark Miller, Meegyeong Paik, Athina Peidou, and Christopher Volk

The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO), launched in May 2018, provides invaluable information about mass change in the Earth system, continuing the legacy of GRACE. Fundamental requirements for successful mass change recovery are precise orbit determination and inter-satellite ranging, determination of the relative clock alignment of the ultra-stable oscillators (USOs), precise attitude determination, and accelerometry. NASA/Caltech Jet Propulsion Laboratory is the official Level-1 data processing and analysis center and provides weekly Level-1A/B data updates. Here we present analysis of the aforementioned GRACE-FO sensor data, updates to the accelerometer transplant calibrations, as the basis for Level-2 release RL06.3, and a discussion of the overall GRACE-FO measurement system performance in light of an increasing Solar cycle 25. We also provide an update on current GRACE/GRACE-FO reprocessing efforts toward a future unified Release-07 data record.

 

The research presented in this abstract has been carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

 

©2024 California Institute of Technology. Government sponsorship acknowledged.

How to cite: Mccullough, C., Bertiger, W., Blackwood, C., Byun, S., Fahnestock, E., Finch, C., Harvey, N., Landerer, F., Miller, M., Paik, M., Peidou, A., and Volk, C.: GRACE and GRACE-FO Level-1 V04 Data Processing Status, GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-96, https://doi.org/10.5194/gstm2024-96, 2024.

10:25–10:35
|
GSTM2024-93
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On-site presentation
|
Status of AOD1B 
Linus Shihora, Kyriakos Balidakis, Robert Dill, and Henryk Dobslaw

The Atmosphere and Ocean non-tidal De-aliasing Level-1B (AOD1B) product is widely used in satellite gravimetry to correct for transient effects of atmosphere-ocean mass variability that would otherwise alias into monthly-mean global gravity fields. 
In this presentation we give a short overview of recent and upcoming technical changes to the delivery of AOD1B. This includes the introduction of change-logs to indicate changes to previously delivered AOD files as well as an outlook of future work in terms of processing stability.

How to cite: Shihora, L., Balidakis, K., Dill, R., and Dobslaw, H.: Status of AOD1B, GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-93, https://doi.org/10.5194/gstm2024-93, 2024.

Coffee break
11:05–11:25
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GSTM2024-91
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On-site presentation
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JPL GRACE and GRACE-FO Level-2 Overview 
David Wiese, Dah-Ning Yuan, Christopher McCullough, Eugene Fahnestock, Matthias Ellmer, Athina Peidou, Da Kuang, Felix Landerer, and Carmen Blackwood

This talk will provide a status update on Level-2 data processing at JPL.  Included will be an overview of data products currently delivered to the community, focusing on the newly released RL06.3 GRACE-FO fields.  Assessments of data quality and error levels, along with detailed discussions of the solution strategy will be included.  A look towards an RL07 reprocessing of GRACE and GRACE-FO will additionally be provided.  The reprocessing plans to incorporate the estimation of a full noise covariance model of the satellite observations in the gravity estimates.  LRI gravity field results consistent with RL06.3 standards will additionally be discussed.

How to cite: Wiese, D., Yuan, D.-N., McCullough, C., Fahnestock, E., Ellmer, M., Peidou, A., Kuang, D., Landerer, F., and Blackwood, C.: JPL GRACE and GRACE-FO Level-2 Overview, GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-91, https://doi.org/10.5194/gstm2024-91, 2024.

11:25–11:45
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GSTM2024-89
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On-site presentation
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GFZ GRACE and GRACE-FO Level-2/-3 Overview 
Christoph Dahle

This presentation will give an overview of GFZ's activities within the GRACE-FO Science Data System (SDS) including the current status of Level-2 and Level-3 products. Additionally, an outlook on the upcoming GFZ RL07 Level-2 time series will be provided.

How to cite: Dahle, C.: GFZ GRACE and GRACE-FO Level-2/-3 Overview, GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-89, https://doi.org/10.5194/gstm2024-89, 2024.

11:45–12:05
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GSTM2024-95
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On-site presentation
Level-2/-3 Status CSR 
Nadege Pie, Peter Nagel, Himanshu Save, Zhigui Kang, Mark Tamisiea, Steve Poole, Chaoyang Zhang, Nick Childress, Ben Krichman, Geethu Jacob, Byron Tapley, and Srinivas Bettadpur

We will present the GRACE-FO Level-2 and Level-3 products currently produced at the CSR as part of the SDS effort, in particular the changes related to the latest releases RL06.2 and RL06.3. We will provide a quality assesment of the gravity products through the usual metrics. Finally, we will offer a status report on the efforts conducted towards the RL07 reprocessing of the GRACE/GRACE-FO data and mean fields.

How to cite: Pie, N., Nagel, P., Save, H., Kang, Z., Tamisiea, M., Poole, S., Zhang, C., Childress, N., Krichman, B., Jacob, G., Tapley, B., and Bettadpur, S.: Level-2/-3 Status CSR, GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-95, https://doi.org/10.5194/gstm2024-95, 2024.

12:05–12:10
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GSTM2024-92
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On-site presentation
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Updates on TN-14 and SLR validation efforts  
Bryant Loomis, Kenny Rachlin, and Ben Griffin

We present the status of the low degree gravity coefficients C20 and C30 derived from satellite laser ranging and distributed as Technical Note 14. This includes comparisons to independent solutions, and analysis of the impacts the recently adopted time variable gravity forward modeling approach and updates to the GRACE-FO Level-2 products. We also present an update of our ongoing efforts to use the SLR-derived global terrestrial water storage anomaly as an independent assessment of the GRACE-FO Level-2 products, including the impacts of the RL06.3 solutions on this metric. 

How to cite: Loomis, B., Rachlin, K., and Griffin, B.: Updates on TN-14 and SLR validation efforts , GRACE/GRACE-FO Science Team Meeting, Potsdam, Germany, 8–10 Oct 2024, GSTM2024-92, https://doi.org/10.5194/gstm2024-92, 2024.

12:10–12:20
Q&A / Discussion