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Impact of self-attraction and loading on the annual cycle in sea level

Tamisiea, M. E,; Hill, E. M.; Ponte, R. M.; Davis, J. L.; Velicogna, I.; Vinogradova, N. T.. 2010 Impact of self-attraction and loading on the annual cycle in sea level. Journal of Geophysical Research, 115. C07004. 10.1029/2009JC005687

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Abstract/Summary

The annual exchange of water between the continents and oceans is observed by GPS, gravimetry, and altimetry. However, the global average amplitude of this annual cycle (observed amplitude of similar to 8 mm) is not representative of the effects that would be observed at individual tide gauges or at ocean bottom pressure recorders because of self-attraction and loading effects (SAL). In this paper, we examine the spatial variation of sea level change caused by the three main components that load the Earth and contribute to the water cycle: hydrology (including snow), the atmosphere, and the dynamic ocean. The SAL effects cause annual amplitudes at tide gauges (modeled here with a global average of similar to 9 mm) to vary from less than 2 mm to more than 18 mm. We find a variance reduction (global average of 3 to 4%) after removing the modeled time series from a global set of tide gauges. We conclude that SAL effects are significant in places (e. g., the south central Pacific and coastal regions in Southeast Asia and west central Africa) and should be considered when interpreting these data sets and using them to constrain ocean circulation models

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2009JC005687
Programmes: Oceans 2025 > Climate, ocean circulation and sea level
ISSN: 0148-0227
Additional Information. Not used in RCUK Gateway to Research.: Tamisiea, M. E. Hill, E. M. Ponte, R. M. Davis, J. L. Velicogna, I. Vinogradova, N. T. Natural Environment Research Council ; NASA [NNX08AJ79G, NNX07AM77G] This study was funded by Natural Environment Research Council's Oceans 2025 program (MET), NASA grants NNX08AJ79G (EMH, JLD) and NNX07AM77G (EMH, RMP, JLD, NTV), NASA's Cryospheric Science Program, Solid Earth and Natural Hazards Program, Terrestrial Hydrology Program and the NSF Office of Polar Programs (IV). We would like to thank Chris Hughes for discussions and Erik Ivins and an anonymous reviewer for useful suggestions. The GLDAS/Noah data used in this study were acquired as part of the mission of NASA's Earth Science Division and archived and distributed by the Goddard Earth Sciences (GES) Data and Information Services Center (DISC). NCEP Reanalysis derived data were provided by the NOAA-ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/. Amer geophysical union Washington
Additional Keywords: SATELLITE ALTIMETRY; ICE SHEETS; WATER MASSES; EQUILIBRIUM; VARIABILITY; PRESSURE; DYNAMICS; MODELS; OCEAN LOADING
NORA Subject Terms: Marine Sciences
Date made live: 07 Apr 2011 15:17
URI: http://nora.nerc.ac.uk/id/eprint/13845

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