A possible relationship between the Arctic Oscillation Index and atmosphere-triggered inter-annual long-wavelength gravitational variations

A host of geophysical processes contribute to temporal variations in the low-degree zonal harmonics of the Earth’s gravity field. The present paper focuses on atmosphere-based mass redistributions using global surface pressure data from the NOAA Climate Diagnostics Center for the period 1980-2002. W...

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Bibliographic Details
Main Authors: G. Lentini, M. Maugieri, R. Devoti, R. Sabadini, ALBERTELLA, ALBERTA
Other Authors: G., Lentini, M., Maugieri, R., Devoti, Albertella, Alberta, R., Sabadini
Format: Article in Journal/Newspaper
Language:English
Published: 2006
Subjects:
Arctic
Online Access:http://hdl.handle.net/11311/645930
https://doi.org/10.1393/ncc/i2005-10193-2
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Summary:A host of geophysical processes contribute to temporal variations in the low-degree zonal harmonics of the Earth’s gravity field. The present paper focuses on atmosphere-based mass redistributions using global surface pressure data from the NOAA Climate Diagnostics Center for the period 1980-2002. We computed atmosphere-triggered temporal variations of the Earth’s low-degree zonal gravitational coefficients Jl (l = 2 : 4). Such atmosphere-triggered ΔJl(t) are compared with the Arctic Oscillation Index (AOI) and with the observed ΔJl(t) computed by the Italian Space Agency (ASI) so as to investigate a possible coupling. We show that there is a significant agreement between the AOI and atmosphere-triggered ΔJl(t), as well as a particularly interesting correlation between the winter ΔJl(t) series and the AOI active season series.

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