The study of ocean circulation dynamics with numerical models     

Masahiro Endoh 《Journal of Oceanography》1980,36(2):134-140

Summarized is the author's study of the ocean circulation dynamics with numerical models, for which he was honored by the Okada Prize (1979). Cited topics are formation of the western boundary current and its variation associated with imposed wind stress, some effects of a marine ridge on the boundary current, coastal upwelling circulation and coastal thermohaline front formation. Recent modelling efforts in Japan, specifically on numerical study of ocean circulation dynamics are also reviewed.  相似文献   

Diagenetic behavior of manganese in Tokyo Bay sediment     

Masahiro Sakata  Yasushi Kitano  Eiji Matsumoto 《Journal of Oceanography》1981,37(4):212-217

To understand the behavior of manganese in diagenetic processes in sediments of an enclosed bay which is similar to those of an estuary, chemical analyses have been carried out on both sediment and interstitial water of a core sample collected from Tokyo Bay. The results suggest that redistribution of manganese takes place within the sediment as a result of the dissolution of buried manganese oxides and hydroxides under reducing condition, the downward diffusion of Mn²⁺ through the interstitial water toward lower layers and then the precipitation of carbonate. The carbonate formed in the sediment contains managanese carbonate probably as a solid solution between calcitic calcium carbonate and manganese carbonate.  相似文献   

Policies governing the distribution of by-products from scientific and small-scale coastal whaling in Japan     

Aiko Endo  Masahiro Yamao 《Marine Policy》2007

The Japanese government is committed to resuming sustainable commercial whaling, both on the high seas and along the Japanese coastline. To this end scientific whaling programs are supported with public money and the byproducts of the catch are distributed to the public and utilized in a variety of ways. Here we review the policies which govern how these byproducts are disseminated within Japan, as well as how the population as a whole makes use of whale resources. Possibilities for the future, if and when the international moratorium on commercial whaling ends, are also discussed.  相似文献   

Double-celled circulation in coastal upwelling     

Masahiro Endoh 《Journal of Oceanography》1977,33(1):30-37

Simple numerical experiments on two-dimensional coastal upwelling are made with emphasis on the role of non-geostrophic solenoidal field of density in the formation of double-celled circulation and multi-celled density front. Geometry of shelf and slope is not taken into account. Existence of poleward undercurrent presumably caused by the longshore variation of the large scale pressure field is also suppressed for the sake of simplicity.The results are, (1) double-celled circulation revealed in the present experiment is closely related with the internal frictional layer, where the horizontal density gradient balances with the vertical gradient of the longshore velocity and the vertical diffusion of the vorticity. (2) density front formed by the emergence of the pycnocline to the sea surface is successively advected offshoreward by the Ekman transport. (3) the pycnocline intersecting the sea surface forms the density front which is nearly vertical on account of the small scale convection. The surface currents converge at the front and construct an anti-clockwise circulation (viewed from the lee side). (4) small coefficient of eddy viscosity and strong wind stress lead the Ekman transport unstable and form a multi-celled structure in the frontal region.  相似文献   

Reply to Bassin and McKee's comments on “Large suspended particle”     

Masahiro Kajihara  Katsuhiko Matsunaga  Yoshiaki Maita 《Journal of Oceanography》1976,32(2):93-96

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Evolutionary tracks of the terrestrial planets     

Takafumi Matsui  Yutaka Abe 《Earth, Moon, and Planets》1987,39(3):207-214

On the basis of the model proposed by Matsui and Abe, we will show that two major factors — distance from the Sun and the efficiency of retention of accretional energy — control the early evolution of the terrestrial planets. A diagram of accretional energy versus the optical depth of a proto-atmosphere provides a means to follow the evolutionary track of surface temperature of the terrestrial planets and an explanation for why the third planet in our solar system is an aqua-planet.  相似文献   

Relationships between trace element concentrations and the stable nitrogen isotope ratio in biota from Suruga Bay,Japan     

Masahiro Sakata  Ai Miwa  Satoshi Mitsunobu  Yasuhiro Senga 《Journal of Oceanography》2015,71(1):141-149

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Effects of clear-cutting,meteorological, and physiological factors on evapotranspiration in the Kamabuchi experimental watershed in northern Japan     

Tayoko Kubota  Akira Kagawa  Toshio Abe  Ikuhiro Hosoda 《水文研究》2021,35(4):e14111

This study investigated the effects of clear-cutting and the meteorological and physiological factors on forest evapotranspiration (ET), by using the water-budget method in the Kamabuchi experimental watershed (KMB; 38° 56′ 21″ N, 140° 15′ 58″ E) in northern Japan. Meteorological and discharge data collected during no-snow periods (from June to October) from 1939 were used to compare ET in three sub-watersheds: No. 1, where the forest had been left undisturbed, and No. 2 and No. 3, where Cryptomeria japonica was planted after clear-cutting. Paired watershed experiments revealed that clear-cutting caused ET to decrease by approximately 100 mm yr⁻¹, and this reduction continued for more than 20 years, even after C. japonica was planted. ET fluctuated similarly across all watersheds, regardless of clear-cutting or planting. This fluctuation is mainly caused by solar radiation and temperature. Intrinsic water-use efficiency (iWUE) calculated using δ¹³C of tree-ring cellulose in C. japonica increased due to elevated atmospheric CO₂ concentration. We estimated annual carbon fixation in a single tree as the annual net photosynthesis (A). Subsequently, transpiration (E) was calculated from the relationship between iWUE and A. The results showed that A and E per tree increased as the tree grew older; however, the trees' responses to increasing c_a suppress the increase in ET. Moreover, the fluctuation of ET from the watershed was small compared to the fluctuation of P during the observation periods because the increase and decrease in E and interception loss complemented each other.  相似文献   

Characteristic of Si:P:N ratio in bottom water in central Suo-Nada,western Seto Inland Sea   总被引：1，自引：0，他引：1  

Kazuo Abe  Mutsumi Tsujino  Norihisa Nakagawa  Katsuyuki Abo 《Journal of Oceanography》2015,71(1):53-63

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Underestimation of nutrient fluxes due to possible bacterial activity during a core incubation experiment   总被引：1，自引：0，他引：1  

Kazuo Abe  Mutsumi Tsujino  Takehiro Kazama  Norihisa Nakagawa  Katsuyuki Abo 《Journal of Oceanography》2015,71(3):263-270

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