All issues
Volume 38 (1982 - 198･･･
- Issue 6 Pages 331-
- Issue 5 Pages 273-
- Issue 4 Pages 183-
- Issue 3 Pages 115-
- Issue 2 Pages 43-
- Issue 1 Pages 1-
Volume 38, Issue 3
Displaying 1-7 of 7 articles from this issue
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Wave Properties when the Density Interface Intersects a Sloping BottomMasaki KAWABE1982 Volume 38 Issue 3 Pages 115-124
Published: July 25, 1982
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSProperties of coastal trapped waves when the pycnocline intersects a sloping bottom are studied using a two-layer model which has slopes in both layers. In this system there is an infinite discrete sequence of modes, and four different sorts of waves exist: the barotropic Kelvin wave, the upper shelf wave, the lower shelf wave and the internal Kelvin-type wave. They all propagate with the coast to their right in the Northern Hemisphere. The upper and lower shelf waves are due to the topographic β-effect on the upper-layer and lowerlayer slopes, respectively. Their motions are dominant in the respective layers being accompanied by significant interface elevations. The properties of the upper (lower) shelf wave are almost unaffected by the existence of a lower-layer (upper-layer) slope. The motion of the internal Kelvin-type wave is confined to the region around the line where the density interface intersects the bottom slope.
The modes, except that with the fastest phase speed (the barotropic Kelvin wave), are assigned mode numbers in order of descending frequency. Characteristics of Mode 1 change with wavenumber; the upper shelf wave for small wavenumbers and the internal Kelvin-type wave for large wavenumbers (high frequencies). The higher modes of Mode 2 and above can be classified into the upper and lower shelf waves.View full abstractDownload PDF (1478K) -
Part III. Mechanism of the Nearshore Branch of the Tsushima CurrentJong-Hwan YOON1982 Volume 38 Issue 3 Pages 125-130
Published: July 25, 1982
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSBy using a two-dimensional barotropic model on a β-plane, the effect of the bottom topography on the path of the Tsushima Current is investigated. The rectangular model ocean with continental slopes has two openings: one is located at the southern boundary and the other at the eastern boundary. In a steady state, most of the water supplied into the. model ocean through the inflow opening, flows along the continental slope with the coast to the right. Continental shelf waves play an important role in the process of adjustment to a steady state. It is suggested that the nearshore branch of the Tsushima Current might be largely topographically controlled.View full abstractDownload PDF (840K) -
Satoru KANAMORI1982 Volume 38 Issue 3 Pages 131-136
Published: July 25, 1982
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSA new method for shipboard calibration of an infrared absorption carbon dioxide analyser was devised, utilizing the oxidative decomposition reaction of oxalic acid by permanganate in acid solution. With the present method, shipboard analysis of total carbon dioxide in 2ml of sea water can be carried out with an error of less than 0.5 %. Some improvements in the analyser system are also presented.View full abstractDownload PDF (829K) -
HCH (BHC) Isomers and DDT Compounds in the Western Pacific, Eastern Indian and Antarctic OceansShinsuke TANABE, Ryo TATSUKAWA, Masahide KAWANO, Hideo HIDAKA1982 Volume 38 Issue 3 Pages 137-148
Published: July 25, 1982
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSConcentrations of chlorinated hydrocarbons such as HCH isomers and DDT compounds were determined in air and surface water samples taken from the Western Pacific, Eastern Indian and Antarctic Oceans.The most interesting finding was their presence in measurable concentrations in the Antarctic Ocean.Chlorinated hydrocarbon pesticides are widely distributed in the open ocean environment over both the northern and southern hemispheres, and some characteristic distribution patterns of pesticide species in different oceanic regions were observed both in air and water samples.HCH residues found in the northern hemisphere were much higher in concentration than those in the southern hemisphere.On the other hand, higher concentrations of DDT residues were found in the tropical regions, but their levels were not so different between both the northern and southern hemispheres. HCH isomers found in the northern hemisphere had the following order of concentrations:α-HCH>γ-HCH>β-HCH, while in the southern hemisphere γ-HCH was apparently dominant. DDT compound compositions were rather uniform in all, the oceans surveyed, and more than 50% was p, p'-DDT.These facts can be explained by the world wide situation regarding pesticide use and the physicochemical properties of the pesticides such as their vapor pressures and water solubilities.In addition, the meridional circulation of the atmosphere, particularly the mass flows of the Hadley and Ferrel cells in the troposphere, also contributes to the atmospheric transport and global distribution of these pesticides.View full abstractDownload PDF (2375K) -
Shin-ichi UYE1982 Volume 38 Issue 3 Pages 149-158
Published: July 25, 1982
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSMeasurements of dry weight, carbon- and nitrogen contents together with the body length of important zooplankton from the Inland Sea of Japan were made using freshly caught specimens. The values of the former three parameters were found to be highly correlated to length, and species specific regression equations were calculated for 10 species of Copepoda (Calanus sinicus, Euchaeta plana, E. concinna, Centropages abdominalis, Sinocalanus tenellus, Acartia clausi, A. tsuensis, Tortanus forcipatus, Oithona brevicornis and O. similis), 3 species of Cladocera (Podon leuckarti, P. polyphemoides and Penilia avirostris), 1 species of each of Mysidacea (Neomysis japonica), and Natantia (Acetes japonicus), and two forms of Chaetognatha (Sagitta crassa and S. crassa f. naikaiensis).View full abstractDownload PDF (1422K) -
Kunio KUTSUWADA1982 Volume 38 Issue 3 Pages 159-171
Published: July 25, 1982
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe wind-stress field in the North Pacific Ocean during 1961-75 is computed from nearly five million ship reports. With a drag coefficient having a linear relation to wind speed, annual mean and monthly mean wind-stress fields are obtained, and their features are described.
Compared with the stress fields obtained by HELLERMAN (1967) and WYRTKI and MEYERS (1976), the eastward component of the stress in the present study is larger in magnitude and the northward one smaller in magnitude, especially in the trade wind region. Differences in the drag coefficient do not have a pronounced effect on the estimated stress field. Longperiod inter-annual variations in the wind field are the most likely cause ofthe discrepancies between the present study and those of the above authors.
The maximum of the wind-stress curl, estimated from the annual mean wind-stress fields, is as large as 1.0×10-8 dyn cm-8 around 30°N, and is larger than that estimated by EVENSON and VERONIS (1975). The discrepancy is considered to be mainly due to differences in the computed stress field itself rather than due to differences in the grid size used in the stress computations.
The Sverdrup transports integrated from the eastern boundary on the basis of the present stress field have a maximum greater than 40×1012 cm3 s-1 (Sv.) near the western boundary around 30°N. This value is closer to the observed transport of the Kuroshio than that based on Hellerman's stress field.View full abstractDownload PDF (2464K) -
Toshiyuki HIBIYA, Kinjiro KAJIURA1982 Volume 38 Issue 3 Pages 172-182
Published: July 25, 1982
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSLarge oscillations of water level in Nagasaki Bay are called Abiki and are most frequently observed in winter. The largest Abiki recorded in the past 20 years at the tide station at Nagasaki occurred on March 31, 1979. Simultaneously, a distinct atmospheric pressure disturbance of solitary type with an amplitude of about 3 mb was recorded at several neighbouring stations in Kyûshû, which indicated the pressure disturbance probably travelled eastward with an average speed of about 110kmh-1
The quantitative relation between this pressure disturbance and notable seiches observed in Nagasaki Bay is examined by means of numerical simulation, and it is confirmed that the exceptionally large range of oscillations in the bay, which reached 278 cm at the tide station, was indeed produced by this travelling pressure disturbance.
The leading part of shallow water waves induced by the atmospheric pressure disturbance was amplified up to about 10cm in amplitude, over the broad continental shelf region off China, because of near resonant coupling to the pressure disturbance. After leaving this continental shelf region, the amplified water wave converged into the shelf region (Gotô Nada) surrounded by the north-western coast of Kyûshû and the Gotô. Islands and excited eigenoscillations on the shelf. A train of waves thus: formed with a period of about 35 min entered Nagasaki Bay and was resonantly amplified at periods of 36 min and 23 min which are the eigen periods of the bay. Besides resonance, the combined effects of shoaling and reflection inside Nagasaki Bay also enhanced the amplification.View full abstractDownload PDF (3643K)
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