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1.
2.
Hasegawa Takuya Nagano Akira Matsumoto Hiroyuki Ariyoshi Keisuke Wakita Masahide 《Marine Geophysical Researches》2019,40(4):513-514
Marine Geophysical Research - In the original publication, the Fig. 2 was published incorrectly. The correct version (Fig. 2) is given in this correction. The original article has been... 相似文献
3.
The distribution of Fe3+ and Ga3+ between the two tetrahedral sites in three synthetic melilites has been studied by using 57Fe Mössbauer spectroscopy. In the melilite, (Ca2Ga2SiO7)50 (Ca2Fe3+GaSiO7)50 (mol %), the distribution of Fe3+ and Ga3+ in T1 and T2 sites is apparently random, which can be explained in terms of the electrostatic valence rule. However in the melilites, (Ca2MgSi2O7)52 (Ca2Fe3+GaSiO7)42 (Ca2Ga2SiO7)6 and (Ca2MgSi2O7)62 (Ca2Fe3+GaSiO7)36 (Ca2Ga2SiO7)2 (mol %), Fe3+ shows preference for the more ionic T1 site and Ga3+ for the more covalent T2 site. If the electronegativity of Ga3+ is assumed to be larger than that of Fe3+, the mode of distribution of Fe3+ and Ga3+ can be explained in terms of our previous hypothesis that a large electronegativity induces a stronger preference for the more covalent T2 site. 相似文献
4.
Isamu Hattori 《Mathematical Geology》1985,17(2):167-175
A micropaleontologic assemblage zone is defined by occurrence of some characteristic species among many coeval species. When number of assemblage-defining species and total number of species observed are designated as Aand N,respectively, the ratio, A/N,is strongly dependent on duration of the assemblage. Theoretical consideration on the basis of a micropaleontologic cohort model shows that, when origination rate and extinction rate of species are obtained, the most reasonable ratio (A/N) and duration of the assemblage can be determined. The probabilistic model described in this paper provides a theoretical relation between the ratio and the duration. Inaccuracy in correlating micropaleontologic data to certain assemblage zones established can not be avoided because of many natural sorting and artificial biases. Ambiguity arising when data with a small number of characteristic species are correlated with a certain assemblage is numerically estimated. 相似文献
5.
Volume transports proceeding to the Kuroshio Extension region and recirculating in the Shikoku Basin 总被引:4,自引:1,他引:3
Akira Nagano Kaoru Ichikawa Hiroshi Ichikawa Masanori Konda Kiyoshi Murakami 《Journal of Oceanography》2013,69(3):285-293
The volume transport of the Kuroshio, the western boundary current of the North Pacific subtropical gyre, varies vigorously due to merging of disturbances propagating from the entire North Pacific. Taking into account the recirculation in the Shikoku Basin by the zonal observation line at 30°N to the west of the Izu–Ogasawara Ridge, we estimated the volume transport in the top 1,000 m layer toward the Kuroshio Extension region. The volume transport of the local recirculation gyre in the Shikoku Basin increases associated with the westward extension of the gyre, particularly in the period of the large meandering path of the Kuroshio south of Japan. Meanwhile, most of the transport variations toward the Kuroshio Extension region correspond to those of the Kuroshio transport on the continental slope south of Japan, which vary independently of those of the recirculation gyre. 相似文献
6.
Large ageostrophic currents in the abyssal layer southeast of Kyushu, Japan, by direct measurement of LADCP 总被引:1,自引:1,他引:0
Akira Nagano Kaoru Ichikawa Hiroshi Ichikawa Yasushi Yoshikawa Kiyoshi Murakami 《Journal of Oceanography》2013,69(2):259-268
With full-depth LADCP velocity data collected in a wide area southeast of Kyushu, Japan, large velocity currents, occasionally exceeding 15 cm s?1, were observed in a thick, 500–1,500 m, near-homogeneous density layer below approximately 3,000 m depth around the steep topographies. The currents were found not to flow along the topographic contours, and to be strongly ageostrophic. The directions of the bottom-layer currents are rather related with phase of the semi-diurnal tides, suggesting deeply intruded internal tides generated at the steep topographies. 相似文献
7.
Applying segment-wise altimetry-based gravest empirical mode method to expendable bathythermograph temperature, Argo salinity, and altimetric sea surface height data in March, June, and November from San Francisco to near Japan (30° N, 145° E) via Honolulu, we estimated the component of the heat transport variation caused by change in the southward interior geostrophic flow of the North Pacific subtropical gyre in the top 700 m layer during 1993–2012. The volume transport-weighted temperature (TI) is strongly dependent on the season. The anomaly of TI from the mean seasonal variation, whose standard deviation is 0.14°C, was revealed to be caused mainly by change in the volume transport in a potential density layer of 25.0?25.5σ??. The anomaly of TI was observed to vary on a decadal or shorter, i.e., quasi-decadal (QD), timescale. The QD-scale variation of TI had peaks in 1998 and 2007, equivalent to the reduction in the net heat transport by 6 and 10 TW, respectively, approximately 1 year before those of sea surface temperature (SST) in the warm pool region, east of the Philippines. This suggests that variation in TI affects the warm pool SST through modification of the heat balance owing to the entrainment of southward transported water into the mixed layer. 相似文献
8.
Direct Measurements of Deep Currents in the Northern Japan Sea 总被引:5,自引:0,他引:5
Masaki Takematsu Zentaro Nagano Alexander G. Ostrovski Kuu Kim Yuri Volkov 《Journal of Oceanography》1999,55(2):207-216
Long-term current measurements by means of subsurface moorings were made for the first time at seven sites in the Japan Basin,
the northern part of the Japan Sea. The objective was to directly explore the velocity field in the highly homogeneous deep
water mass (the Japan Sea Proper Water) that occupies depths below 500 m. On each mooring three current meters were equipped
at an approximately equal distance below about 1000 m depth. Duration of the measurements was 1 to 3 years depending on specific
site. This paper describes the basic data set from the moored measurements. It is found that the deep water of the Japan Basin
is very energetic with eddies and vertically coherent currents of the order of 0.1 m/s. Surprisingly, the currents and eddies
exhibit strong seasonal dependence even in the deepest layers of the Basin. The observed new current features are discussed
in comparison with conventional deep circulation pictures derived from hydrographic data.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
9.
Yutaka Nagata Junichi Takeuchi Makoto Uchida Isamu Ishikura Yoshitaka Morikawa Takashi Koike 《Journal of Oceanography》1999,55(3):407-416
The Kuroshio flows very close to Cape Shionomisaki when it takes a straight path. The detailed observations of the Kuroshio were made both on board the R/V Seisui-maru of Mie University and on board the R/V Wakayama of the Wakayama Prefectural Fisheries Experimental Station on June 11–14, 1996. It was confirmed that the current zone of the Kuroshio touches the coast and bottom slope just off Cape Shionomiaki, and that the coastal water to the east of the cape was completely separated from that to the west. The relatively high sea level difference between Kushimoto and Uragami could be caused by this separation of the coastal waters when the Kuroshio takes a straight path. This flow is rather curious, as the geostrophic flow, which has a barotropic nature and touches the bottom, would be constrained to follow bottom contours due to the vorticity conservation law. The reason why the Kuroshio leaves the bottom slope to the east of Cape Shionomisaki is attributed to the high curvature of the bottom contours there: if the current were to follow the contours, the centrifugal term in the equation of motion would become large and comparablee to the Coriolis (or pressure gradient) term, and the geostrophic balance would be destroyed. This creates a current-shadow zone just to the east of the cape. As the reason why the current zone of the Kuroshio intrudes into the coastal region to the west of the cape, it is suggested that the Kii Bifurcation Current off the southwest coast of the Kii Peninsula, which is usually found when the Kuroshio takes the straight path, has the effect of drawing the Kuroshio water into the coastal region. The sea level difference between Kushimoto and Uragami is often used to monitor the flow pattern of the Kuroshio near the Kii Peninsula. It should be noted that Uragami is located in the current shadow zone, while Kushimoto lies in the region where the offshore Kuroshio water intrudes into the coastal region. The resulting large sea level difference indicates that the Kuroshio is flowing along the straight path. 相似文献
10.
N. Hayashida M. Nagano D. Nishikawa H. Ohoka N. Sakaki M. Sasaki M. Takeda M. Teshima R. Torii T. Yamamoto S. Yoshida K. Honda N. Kawasumi I. Tsushima N. Inoue E. Kusano K. Shinozaki N. Souma K. Kadota F. Kakimoto K. Kamata S. Kawaguchi Y. Kawasaki H. Kitamura Y. Matsubara K. Murakami Y. Uchihori H. Yoshii 《Astroparticle Physics》1999,10(4):125-311
Anisotropy in the arrival directions of cosmic rays with energies above 1017 eV is studied using data from the Akeno 20 km2 array and the Akeno Giant Air Shower Array (AGASA), using a total of about 114 000 showers observed over 11 years. In the first harmonic analysis, we have found a strong anisotropy of 4% around 1018 eV, corresponding to a chance probability of 0.2% after taking the number of independent trials into account. with two-dimensional analysis in right ascension and declination, this anisotropy is interpreted as an excess of showers near the directions of the Galactic Center and the Cygnus region. 相似文献