New Zealand Journal of Marine and Freshwater Research abstracts

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Ocean-tide loading and Earth tides around New Zealand

Derek G. Goring
Roy A. Walters

National Institute of Water and Atmospheric
Research Limited
P.O. Box 8602
Christchurch, New Zealand
email: d.goring@niwa.cri.nz

Abstract  Cotidal charts of ocean-tide loading and Earth tides for the New Zealand region are presented for eight constituents (M₂, S₂, N₂, K₂, K₁, O₁, P₁, Q₁). Ocean-tide loadings were calculated by evaluating a convolution integral between tide models (global and local) and a Green’s function that describes the response of the Earth to tide loading. Earth tides were calculated from the tide-generating potential. The ocean-tide loadings are a maximum to the north of New Zealand for M₂ and N₂ and in the western Cook Strait region for S₂ and K₂. The diurnal ocean-tide loadings are dominated by amphidromes east of the Chatham Islands (K₁ and P₁) and north of Bay of Plenty (O₁ and Q₁). Diurnal Earth tides are a maximum at 45°S and vary only slightly in amplitude and phase over New Zealand; semidiurnal Earth tides increase from south to north.

Keywords  tides; ocean-tide loading; Earth tides; tidal constituents

M01001 Received 4 January 2001; accepted 25 October 2001
New Zealand Journal of Marine and Freshwater Research, 2002, Vol. 36: 299–309
0028–8330/02/3602–0299 $7.00 © The Royal Society of New Zealand 2002

PDF file of entire paper: Print-quality (7888K)

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