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ModelUsing real polar terrestrial gravimetry data to overcome the polar gap problem of GOCE - the gravity field model IGGT_R1C
Cite as:
Lu, Biao; Förste, Christoph; Barthelmes, Franz; Petrovic, Svetozar; Flechtner, Frank; Luo, Zhicai; Zhong, Bo; Zhou, Hao; Wang, Xiaolong; Wu, Tangting (2018): Using real polar terrestrial gravimetry data to overcome the polar gap problem of GOCE - the gravity field model IGGT_R1C. GFZ Data Services. https://doi.org/10.5880/icgem.2019.001Status
I N R E V I E W : Lu, Biao; Förste, Christoph; Barthelmes, Franz; Petrovic, Svetozar; Flechtner, Frank; Luo, Zhicai; Zhong, Bo; Zhou, Hao; Wang, Xiaolong; Wu, Tangting (2018): Using real polar terrestrial gravimetry data to overcome the polar gap problem of GOCE - the gravity field model IGGT_R1C. GFZ Data Services. https://doi.org/10.5880/icgem.2019.001
Abstract
With the successful completion of ESA's PolarGAP campaign, terrestrial gravimetry data (gravity anomalies) are now available for both polar regions. Therefore, it is now possible to overcome the GOCE polar gap by using real gravimetry data instead of some regularization methods. But terrestrial gravimetry data needs to become filtered to remove the high-frequency gravity information beyond spher. harm. degree e.g. 240 to avoid disturbing spectral leakage in the satellite-only gravity field models. For the gravity anomalies from the Arctic, we use existing global gravity field models (e.g., EGM2008) for this filtering. But for the gravity anomalies from Antarctica, we use local gravity field models based on a point mass modeling method to remove the high-frequency gravity information. After that, the boundary-value condition from Molodensky's theory is used to build the observation equations for the gravity anomalies. Finally, variance component estimation is applied to combine the normal equations from the gravity anomalies, from the GOCE GGs (e.g., IGGT_R1), from GRACE (e.g., ITSG-Grace2014s) and for Kaula's rule of thumb (higher degree/order parts) to build a global gravity field model IGGT_R1C without disturbing impact of the GOCE polar gap. This new model has been developed by German Research Centre for Geosciences (GFZ), Technical University of Berlin (TUB), Wuhan University (WHU) and Huazhong University of Science and Technology (HUST). Parameters
static model modelname IGGT_R1C
product_type gravity_field
earth_gravity_constant 0.3986004415E+15
radius 0.6378136460E+07
max_degree 240
norm fully_normalized
tide_system tide_free
errors formal
Authors
- Lu, Biao
;GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany; Department of Geodesy and Geoinformation Science, Technical University of Berlin, 10623 Berlin, Germany;School of Geodesy and Geomatics, Wuhan University, Wuhan, PR China - Förste, Christoph;GFZ German Research Centre for Geosciences, Potsdam, Germany
- Barthelmes, Franz;GFZ German Research Centre for Geosciences, Potsdam, Germany
- Petrovic, Svetozar;GFZ German Research Centre for Geosciences, Potsdam, Germany
- Flechtner, Frank;GFZ German Research Centre for Geosciences, Potsdam, Germany
- Luo, Zhicai;Institute of Geophysics, Huazhong University of Science and Technology, Wuhan, PR China
- Zhong, Bo;School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, PR China
- Zhou, Hao;Huazhong University of Science and Technology, Wuhan, PR China
- Wang, Xiaolong;School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, PR China
- Wu, Tangting;School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, PR China
Contact
- Lu, Biao (PhD student) ; GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany; Department of Geodesy and Geoinformation Science, Technical University of Berlin, 10623 Berlin, Germany; School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, People’s Republic of China; ➦
Contributors
Ince, Elmas Sinem; Reißland, SvenKeywords
IGGT_R1C, GOCE, GRACE, Polar Gravity Anomalies, Kaula Rule, geodesy, geophysicsGCMD Science Keywords
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