Analysing Five Years of GRACE Equivalent Water Height Variations Using the Principal Component Analysis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

In this study we use 59 monthly solutions (April 2002-May 2007) of the Earth's gravity field obtained from the Gravity Recovery and Climate Experiment (GRACE) satellite mission, expressed in equivalent water height (EWH). The GRACE-derived EWH values are analysed first in terms of the secular trend and RMS-variability before applying the statistically-based Principal Component Analysis (PCA), in order to obtain the most dominant spatial and temporal variations. On a global scale, we show that only 5 modes can express more than 80% of the total variability, including all major hydrological, cryospheric and post-glacial rebound signals. As expected, globally, the most dominant temporal variation is an annual signal followed by a secular trend. Apart from these well-known signals, we show that the PCA is able to reveal other periodic and a-periodic signals.

Original languageEnglish
Title of host publicationGravity, Geoid and Earth Observation - IAG Commission 2
Subtitle of host publicationGravity Field
Pages547-555
Number of pages9
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventIAG International Symposium on "Gravity, Geoid and Earth Observation 2008" - Chania, Crete, Germany
Duration: 23 Jun 200827 Jun 2008

Publication series

NameInternational Association of Geodesy Symposia
Volume135
ISSN (Print)0939-9585

Conference

ConferenceIAG International Symposium on "Gravity, Geoid and Earth Observation 2008"
Country/TerritoryGermany
CityChania, Crete
Period23/06/0827/06/08

Keywords

  • GRACE
  • PCA
  • Spatial and temporal variation

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