Influence analysis of Arctic tide gauges using leverages

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Abstract

Reconstructions of historical sea level in the Arctic Ocean are fraught with difficulties related to lack of data, uneven distribution of tide gauges and seasonal ice cover. Considering the period from 1950 to the present, we attempt to identify conspicuous tide gauges in an automated way, using the statistical leverage of each individual gauge. This may be of help in determining appropriate procedures for data preprocessing, of particular importance for the Arctic area as the GIA is hard to constrain and many gauges are located on rivers. We use a model based on empirical orthogonal functions from a calibration period, in this preliminary case Drakkar ocean model data, which are forced using historical tide gauge data from the PSMSL database. The resulting leverage for each tide gauge may indicate that it represents a distinct mode of variability, or that its time series is perturbed in a way inappropriate for the reconstruction so that it should be removed from the reconstruction model altogether. Therefore, the characteristics of the high-leverage gauges are examined in detail.
Original languageEnglish
Article numberEGU2014-14548-1
JournalGeophysical Research Abstracts
Volume16
Number of pages1
ISSN1607-7962
Publication statusPublished - 2014
EventEuropean Geosciences Union General Assembly 2014 - Vienna, Austria
Duration: 27 Apr 20142 May 2014

Conference

ConferenceEuropean Geosciences Union General Assembly 2014
CountryAustria
CityVienna
Period27/04/201402/05/2014

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