A.1
GRACE-FO Project Status

A.1

GRACE-FO Project Status
Orals
| Tue, 18 Oct, 09:00–15:15 (CEST)|Lecture Hall, Building H

Orals: Tue, 18 Oct, 09:00–15:15 | Lecture Hall, Building H

09:00–09:15
Welcome & Opening Remarks
09:15–09:35
|
GSTM2022-98
|
On-site presentation
|
Extending Global Mass Change Satellite Observations Into the Third Decade With GRACE-FO:Science Mission Status and Plans 
Felix Landerer, Frank Flechtner, Himanshu Save, Christopher McCullough, Christoph Dahle, Srinivas Bettadpur, Robert Gaston, and Krzysztof Snopek

The combined GRACE & GRACE-FO data records now span over 20 years and provide unique observations of monthly to decadal global mass changes and transport 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, the project team will provide the community and science team an overview and summary updates on (1) some recent science and applications highlights, (2) key data processing and calibration campaigns and results since 2021, with a particular focus on the accelerometer data, and (3) the mission plan to operate and collect high-quality science data through the intensifying solar cycle 25, aiming for continuity with future mass change missions. More detailed presentations on each topic will follow this talk, and there will be an open forum for feedback and discussions on the status, findings, and proposed plans.

How to cite: Landerer, F., Flechtner, F., Save, H., McCullough, C., Dahle, C., Bettadpur, S., Gaston, R., and Snopek, K.: Extending Global Mass Change Satellite Observations Into the Third Decade With GRACE-FO:Science Mission Status and Plans, GRACE/GRACE-FO Science Team Meeting 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-98, https://doi.org/10.5194/gstm2022-98, 2022.

09:35–09:50
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GSTM2022-108
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On-site presentation
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GRACE-FO Mission Operations Report 
Krzysztof Snopek

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

How to cite: Snopek, K.: GRACE-FO Mission Operations Report, GRACE/GRACE-FO Science Team Meeting 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-108, https://doi.org/10.5194/gstm2022-108, 2022.

09:50–10:05
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GSTM2022-106
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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 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-106, https://doi.org/10.5194/gstm2022-106, 2022.

10:05–10:20
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GSTM2022-105
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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, 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 is currently processing using software version 04. Here we present analysis of the aforementioned GRACE-FO sensor data, as well an overview of the current GRACE reprocessing, and a discussion of measurement system performance. 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.

How to cite: Mccullough, C., Bertiger, W., Blackwood, C., Byun, S., Fahnestock, E., Finch, C., Harvey, N., Landerer, F., Miller, M., Paik, M., and Volk, C.: GRACE and GRACE-FO Level-1 V04 Data Processing Status, GRACE/GRACE-FO Science Team Meeting 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-105, https://doi.org/10.5194/gstm2022-105, 2022.

10:20–10:30
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GSTM2022-100
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On-site presentation
Status of AOD1B RL07 
Linus Shihora, Zhijun Liu, 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. The most recent release is based on the global ERA5 reanalysis and ECMWF operational data together with simulations from the general ocean circulation model MPIOM consistently forced with fields of the same atmospheric data-set.

The talk focusses on the current status of the new release RL07. We present the changes made for RL07 with respect to the previous release RL06, the current status of the processing as well as the ongoing work in terms of consistency and uncertainty assessment.

How to cite: Shihora, L., Liu, Z., Balidakis, K., Dill, R., and Dobslaw, H.: Status of AOD1B RL07, GRACE/GRACE-FO Science Team Meeting 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-100, https://doi.org/10.5194/gstm2022-100, 2022.

10:30–10:45
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GSTM2022-103
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Virtual presentation
Laser Ranging Interferometer Status 
Samuel Francis, Christopher Woodruff, Robert Spero, Julie Rolla, Brent Ware, Vitali Mueller, Malte Misfeldt, Henry Wegener, Laura Mueller, Gerhard Heinzel, and Kirk McKenzie

The current status of the LRI instrument will be presented. Topics will include a look at in-orbit LRI data following a firmware update in September 2022.

How to cite: Francis, S., Woodruff, C., Spero, R., Rolla, J., Ware, B., Mueller, V., Misfeldt, M., Wegener, H., Mueller, L., Heinzel, G., and McKenzie, K.: Laser Ranging Interferometer Status, GRACE/GRACE-FO Science Team Meeting 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-103, https://doi.org/10.5194/gstm2022-103, 2022.

Coffee break
11:15–11:30
|
GSTM2022-97
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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, including gravity fields with the updated accelerometer transplant product.  Assessments of data quality and error levels, along with detailed discussions of the solution strategy will be included.  A comparison of LRI and KBR gravity fields will be provided..  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.  Preliminary results incorporating this strategy will be shown and 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 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-97, https://doi.org/10.5194/gstm2022-97, 2022.

11:30–11:45
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GSTM2022-96
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On-site presentation
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SDS Level-2/-3 GFZ 
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 alternative processing strategy which could be applied in case of an IPU failure on the GF2 satellite (where currently the redundant IPU is already running) will be presented and preliminary results of this approach will be shown.

How to cite: Dahle, C.: SDS Level-2/-3 GFZ, GRACE/GRACE-FO Science Team Meeting 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-96, https://doi.org/10.5194/gstm2022-96, 2022.

11:45–12:00
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GSTM2022-107
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On-site presentation
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SDS Level-2/-3 CSR 
Nadege Pie, Himanshu Save, Peter Nagel, Zhigui Kang, Steve Poole, Mark Tamisea, and Chaoyang Zhang

We are presenting the GRACE-FO Level-2 and Level-3 products currently produced at the CSR as part of the SDS effort. Some analysis results and comparisons are given to evaluate the quality of the products. Some on-going research work is introduced as possible avenues for future releases.

How to cite: Pie, N., Save, H., Nagel, P., Kang, Z., Poole, S., Tamisea, M., and Zhang, C.: SDS Level-2/-3 CSR, GRACE/GRACE-FO Science Team Meeting 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-107, https://doi.org/10.5194/gstm2022-107, 2022.

12:00–13:00
SDS Open Discussion (part 1)
Lunch break
14:15–15:15
SDS Open Discussion (part 2)