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Objective analysis for tides in a closed basin
OLR (1985)32 (9)
A. PhysicalOceanography
727
AI50. Tides and sea level
Eighty-eight percent of the sea level variability in North Inlet is due to semidiurnal (75%) and diurnal 03%) tidal components. Meteorologically induced variations occur on time scales from 2 to 14 days, account for 4% of the overall variance, and are likely to be of ecological significance. The seasonal cycle (September high, February low), is related to the water temperature cycle and accounts for 7% of the sea level variance. Skidaway Inst. of Oceanogr., Savannah, GA 31406, USA.
85:4943 Godin, Gabriel, 1985. Modification of river tides by the discharge. J. WatWay Port coast. Ocean Engng, Am. Soc. cir. Engrs, 111(2):257-274.
85:4947 Woodworth, P.L., 1985. A world-wide search for the l l-yr solar cycle in mean sea-level records. Geophys. Jl R. astr. Soc, 80(3):743-755.
The effect of increased discharge is evaluated quantitatively by gaging the signal recorded at upstream stations against a reference station; this process is repeated for progressively larger values of the discharge. Upstream, the tidal range is reduced by increased discharge; the arrival time of low water is accelerated, while high water is retarded. Changes in range and in time may be represented by simple regression relations. Downstream an increased discharge decreases the effective friction during flood and increases it during ebb; low water is retarded and high water is accelerated. 2936 Axles Mews, Mississauga, ON L5N 2N2, Canada.
In Europe an amplitude of 10-15 mm is observed with a phase relative to the sunspot cycle similar to that expected as a response to forcing from previously reported solar cycles in sea-level air pressure and winds. At the highest European latitudes the MSL solar cycle is in antiphase to the sunspot cycle; at mid-latitudes it changes to being approximately in phase. Elsewhere in the world there is no convincing evidence for an 1 l-yr component in MSL records. Inst. of Oceanogr. Sci., Bidston Observ., Birkenhead, Merseyside L43 7RA, UK.
85:4944 Krohn, Joachim, 1984. A global ocean tide model for the M 2 tide with refined grid-resolution in shelf areas. Mitt. Inst. Meeresk. Univ. Hamb., 27:79209.
AI60. Waves, oscillations
85:4942 Wenno, L.F. and J.J. Anderson, 1984. Evidence for tidal upwelling across the sill of Ambon Bay [Indonesia]. Mar. Res. Indonesia, 23:13-20. Ambon Res. Sta., Natl. Inst. of Oceanogr., Ambon, Indonesia.
The model uses a variable grid size to accommodate coastal areas; a coarse mesh of 4 ° (zonal and meridional) covers the deep ocean and is successively refined up to 0.5 ° in shelf areas. Model results are discussed as are problems involved in grid refinement and coupling mechanisms between meshes. (msg) 85:4945 Sanchez, B.V., D.B. Rao and P.G. Wolfson, 1985. Objective analysis for tides in a closed basin. Mar. Geod~ 9(1):71-91. Earth Survey Applications Div., Goddard Space Flight Center, Greenbelt, MD, USA. 85:4946 Schwing, F.B., BjOrn Kjerfve and J.E. Sneed, 1983. Sea level oscillations in a salt marsh lagoon system, North Inlet, South Carolina. An. Inst. Cienc. Mar Limnol., Univ. nac. auttn. Mdx., 10(1):231-236.
85:4948 Alpers, Werner, 1985. Theory of radar imaging of internal waves. Nature, Lond., 314(6008):245-247. Radar images taken over ocean areas, in particular those obtained by SAR onboard Seasat in 1978, sometimes show features that seem to be surface manifestations of oceanic internal waves. Presented here is a theory explaining the large radar signatures of internal waves in which the imaging is attributed to variations in the short-scale surface roughness induced by current variations associated with internal waves. Max-Planck-Inst. fur Meteorol, Bundesstrasse 55, 2000 Hamburg 13, FRG. 85:4949 Barnier, Bernard, 1984. Influence of a mid--ocean ridge on wind--driven barotropic Rossby waves. J. phys. Oceanogr., 14(12): 1930-1936. High-frequency forcings (about 10-day period) excite basin-size topographic Rossby-modes propagating westward along the f/h contours. Lowfrequency forcings (several-week period) excite Rossby-modes relative to each half basin, but modified by the bottom slope. At very low-frequencies (several-month period), Rossby wave re-
A. PhysicalOceanography
727
AI50. Tides and sea level
Eighty-eight percent of the sea level variability in North Inlet is due to semidiurnal (75%) and diurnal 03%) tidal components. Meteorologically induced variations occur on time scales from 2 to 14 days, account for 4% of the overall variance, and are likely to be of ecological significance. The seasonal cycle (September high, February low), is related to the water temperature cycle and accounts for 7% of the sea level variance. Skidaway Inst. of Oceanogr., Savannah, GA 31406, USA.
85:4943 Godin, Gabriel, 1985. Modification of river tides by the discharge. J. WatWay Port coast. Ocean Engng, Am. Soc. cir. Engrs, 111(2):257-274.
85:4947 Woodworth, P.L., 1985. A world-wide search for the l l-yr solar cycle in mean sea-level records. Geophys. Jl R. astr. Soc, 80(3):743-755.
The effect of increased discharge is evaluated quantitatively by gaging the signal recorded at upstream stations against a reference station; this process is repeated for progressively larger values of the discharge. Upstream, the tidal range is reduced by increased discharge; the arrival time of low water is accelerated, while high water is retarded. Changes in range and in time may be represented by simple regression relations. Downstream an increased discharge decreases the effective friction during flood and increases it during ebb; low water is retarded and high water is accelerated. 2936 Axles Mews, Mississauga, ON L5N 2N2, Canada.
In Europe an amplitude of 10-15 mm is observed with a phase relative to the sunspot cycle similar to that expected as a response to forcing from previously reported solar cycles in sea-level air pressure and winds. At the highest European latitudes the MSL solar cycle is in antiphase to the sunspot cycle; at mid-latitudes it changes to being approximately in phase. Elsewhere in the world there is no convincing evidence for an 1 l-yr component in MSL records. Inst. of Oceanogr. Sci., Bidston Observ., Birkenhead, Merseyside L43 7RA, UK.
85:4944 Krohn, Joachim, 1984. A global ocean tide model for the M 2 tide with refined grid-resolution in shelf areas. Mitt. Inst. Meeresk. Univ. Hamb., 27:79209.
AI60. Waves, oscillations
85:4942 Wenno, L.F. and J.J. Anderson, 1984. Evidence for tidal upwelling across the sill of Ambon Bay [Indonesia]. Mar. Res. Indonesia, 23:13-20. Ambon Res. Sta., Natl. Inst. of Oceanogr., Ambon, Indonesia.
The model uses a variable grid size to accommodate coastal areas; a coarse mesh of 4 ° (zonal and meridional) covers the deep ocean and is successively refined up to 0.5 ° in shelf areas. Model results are discussed as are problems involved in grid refinement and coupling mechanisms between meshes. (msg) 85:4945 Sanchez, B.V., D.B. Rao and P.G. Wolfson, 1985. Objective analysis for tides in a closed basin. Mar. Geod~ 9(1):71-91. Earth Survey Applications Div., Goddard Space Flight Center, Greenbelt, MD, USA. 85:4946 Schwing, F.B., BjOrn Kjerfve and J.E. Sneed, 1983. Sea level oscillations in a salt marsh lagoon system, North Inlet, South Carolina. An. Inst. Cienc. Mar Limnol., Univ. nac. auttn. Mdx., 10(1):231-236.
85:4948 Alpers, Werner, 1985. Theory of radar imaging of internal waves. Nature, Lond., 314(6008):245-247. Radar images taken over ocean areas, in particular those obtained by SAR onboard Seasat in 1978, sometimes show features that seem to be surface manifestations of oceanic internal waves. Presented here is a theory explaining the large radar signatures of internal waves in which the imaging is attributed to variations in the short-scale surface roughness induced by current variations associated with internal waves. Max-Planck-Inst. fur Meteorol, Bundesstrasse 55, 2000 Hamburg 13, FRG. 85:4949 Barnier, Bernard, 1984. Influence of a mid--ocean ridge on wind--driven barotropic Rossby waves. J. phys. Oceanogr., 14(12): 1930-1936. High-frequency forcings (about 10-day period) excite basin-size topographic Rossby-modes propagating westward along the f/h contours. Lowfrequency forcings (several-week period) excite Rossby-modes relative to each half basin, but modified by the bottom slope. At very low-frequencies (several-month period), Rossby wave re-