Time-variable gravity fields derived from GPS tracking of Swarm

Aleš Bezděk, Josef Sebera, J.G. de Teixeira da Encarnacao, Jaroslav Klokočnik

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)
66 Downloads (Pure)

Abstract

Since 2002 Gravity Recovery and Climate Experiment (GRACE) provides monthly gravity fields from K-band ranging (KBR) between two GRACE satellites. These KBR gravity monthlies have enabled the global observation of time-varying Earth mass signal at a regional scale (about 400 km resolution). Apart from KBR, monthly gravity solutions can be computed from onboard GPS data. The newly reprocessed GPS monthlies from 13 yr of GRACE data are shown to yield correct time-variable gravity signal (seasonality, trends, interannual variations) at a spatial resolution of 1300 km (harmonic degree 15). We show that GPS fields from new Swarm mission are of similar quality as GRACE GPS monthlies. Thus, Swarm GPS monthlies represent new and independent source of information on time-variable gravity, and, although with lower resolution and accuracy, they can be used for its monitoring, particularly if GRACE KBR/GPS data become unavailable before GRACE Follow-On is launched (2017 August).

Original languageEnglish
Article numberggw098
Pages (from-to)1665-1669
Number of pages5
JournalGeophysical Journal International
Volume205
Issue number3
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • Global change from geodesy
  • Satellite geodesy
  • Time variable gravity

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