Annual variation of sea‐surface slopes over the Scotian Shelf and Grand Banks from Geosat altimetry
Annual variation of sea‐surface slopes over the Scotian Shelf and Grand Banks from Geosat altimetry
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DOI：
10.1080/07055900.1993.9649487
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发表时间：
1993-12
期刊：
影响因子：
1.2
通讯作者：
G. Han;M. Ikeda;Peter C. Smith
中科院分区：
文献类型：
--
作者：
G. Han;M. Ikeda;Peter C. Smith
Abstract The Geosat radar altimeter data from ∼60 repeat cycles of the Exact Repeat Mission (ERM) over the period November 1986 to September 1989 have been analysed to show the annual variations of the sea‐surface slopes, corrected for ocean tides, over the Scotian Shelf and the Grand Banks. A coastal tidal model developed at the Bedford Institute of Oceanography, combined with the global tidal model of Schwiderski, is employed to remove the tidal signals from the sea‐surface heights over those regions. Linear regression is used to estimate the sea‐surface slopes over the inner shelf region, the outer shelf region, or a combination of the two along the Geosat ground tracks. Harmonic analysis is applied to the time series of sea‐surface slopes to derive the annual signals, showing that amplitudes are of order of 5 × 10‐7 (5 cm/100 km) with onshore slopes positive in winter and negative in summer. The largest annual cycles occur over the outer portion of the Laurentian Channel and the southern Grand Banks. ...
