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Comparing Non‐Tidal Ocean Loading Around the Southern North Sea With Subdaily GPS/GLONASS Data
Author(s) -
Geng Jianghui,
Xin Shaoming,
Williams Simon D. P.,
Jiang Weiping
Publication year - 2021
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2020jb020685
Subject(s) - gnss applications , global positioning system , geodesy , glonass , remote sensing , precise point positioning , satellite , geology , real time kinematic , environmental science , computer science , physics , astronomy , telecommunications
Observing subdaily surface deformations is important to the interpretation of rapidly developing transient events. However, it is not known whether Global Navigation Satellite System (GNSS) is able to identify millimeter‐level transient displacements over various subdaily timescales. We studied non‐tidal ocean loading (NTOL) using 18 GNSS stations along the southern North Sea for November–December 2013 and compared 3‐h GPS/GLONASS displacements with NTOL predictions. It was found that they overall agreed well with a mean correlation coefficient of 0.6 and their vertical differences had an RMS of 5.7 mm, but a 10‐mm subsidence prediction for December 5th could only be marginally detected. Hence, the spatial coherence among the loading signatures at the 18 stations was harnessed to improve subdaily GNSS, and then the predicted displacements of 5–10‐mm over the subdaily timescales could be discriminated successfully. We envision that adding Galileo/BeiDou signals to GPS/GLONASS can further improve the resolution of subdaily GNSS, which can also enhance the spatial coherence of transient signals captured by regional GNSS stations.