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1.
論文 |
高, 裕也 ; 二宮, 順一 ; 森, 信人 ; Taka, Yuya ; Ninomiya, Junichi ; Mori, Nobuhito
概要:
金沢大学理工研究域環境デザイン学系<br />In this study, we evaluated the impact of climate change on explosive cyclone using the large ens
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embleclimate prediction data (d4PDF) of present climate experiment 3,000 years (60 years × 50 members) and future climate experiment 5,400 years (60 years × 90 members). Explosive cyclones were extracted from sea level pressure and examined. Although the trend of increasing explosive cyclone didn’t have statistical significance from the difference between present- and future-climate around Japan, the strongest explosive cyclone intensified in future-climate, and future change was estimated about -12 hPa. In addition, as a result of analyzing the explosive cyclone going through the coastal area of Japan, the proportion of strong explosive cyclone like the typhoon had increasing trend. 現在気候実験3,000年(60年×50メンバ)および将来気候実験5,400年(60年×90メンバ)の大規模アンサンブル気候予測データ(d4PDF)を用いて,日本海沿岸における低頻度気象災害要因の一つである爆弾低気圧に対する気候変動の影響評価を実施した.現在気候および将来気候からの爆弾低気圧抽出結果から,発生個数にはほとんど将来変化はないが,最低中心気圧の強度は将来的に増加する傾向があることがわかった.また,日本沿岸域に被害を及ぼす可能性がある爆弾低気圧について解析した結果,全体に占める台風並みに発達する爆弾低気圧の割合が増加し,特に中心気圧の強度も増加する傾向を示した.
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2.
論文 |
池上, 宙志 ; 沖津, 進 ; Ikenoue, Hiroyuki ; Okitsu, Susumu
概要:
[論文] Article
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3.
論文 |
田中, 究 ; 井上, 睦夫 ; 御園生, 淳 ; 小村, 和久
概要:
To obtain implications for the vertical water mixing within the Sea of Japan, we collected 29 water samples from 2 sites
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around the Yamato Ridge (3,685 m and 2,610 m depth), and 24 samples from coastal areas (12 sites) along the Japan Island (85-475 m depth) in May-June 2004 and 2005. ^<226>Ra (t_<1/2>=1,600 y), ^<228>Ra (5.75 y) and ^<137>Cs (30.2 y) were quantitatively coprecipitated by BaSO4 and AMP using 20-60 L of water samples, and their activities were measured by low-background y-spectrometry. From surface to the Upper Proper water (1-1,000 m), the ^<228>Ra and ^<137>Cs activities exhibit gradual decrease from 1.8-0.2 mBq/L and 1.7-0.2 mBq/L, respectively. From the gradient of ^<228>Ra activity, the vertical eddy diffusivity was calculated to be 〜6 cm^2/s around the Yamato Ridge. In the Deep Proper Water (>1,000 m), the ^<228>Ra activity keeps approximately constant (〜0.2 mBq/L). These vertical distributions are reflecting the intense vertical mixing compared with those in other oceans. For deep sites of coastal areas (>〜250 m depth), the ^<228>Ra activities of bottom waters are notably lower (〜0.5 mBq/L) than those of shallow sites (<〜250 m) (0.7-2.2 mBq/L). The exchange of radium between shallow and deep water is inhibited by the boundary layer (thermocline at 〜250 m depth).
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4.
論文 |
井上, 睦夫 ; 藤本, 賢 ; 森田, 貴己
概要:
As a result of atmospheric nuclear test explosions, the Chernobyl reactor accident, radioactive effluents from nuclear power plants, etc., and radioactive waste disposal, anthropogenic radionuclides (e.g.,Cs and iosmAg) have spread
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widely into the world's oceans, including the Sea of Japan.Therefore, around the Japanese Archipelago, radioactivity monitoring of anthropogenic radionuclides has been continually conducted since the 1950s using various marine samples. Particularly in the Sea of Japan, radioactive waste disposal by the former Soviet Union during the I 970s and I 980s became apparent in I 993. Therefore, to assess the effect of the disposal in the Sea of Japan, radioactive monitoring in deep sea environments has been conducted every year since I 996 on the R/V (Research Vessel) Soyo Maru expedition (National Research Institute of Fisheries Science), in addition to the previous conventional surface/coastal monitoring. In the present paper, we exhibit the sampling techniques for seawater (CTD-RMS), marine sediment (core samplers), biota (deep sea pods and benthos nets), and sinking particles (sediment traps) for deep-sea environmental monitoring. We also present the applications of the samples collected on the expeditions to research of geochemical cycles and of the assessment of low-level contamination caused by the Fukushima Dai-ichi Nuclear Power Plant accident (March 201 I) within the Sea of Japan.
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5.
論文 |
Nguyen, Trinh Chung ; Yuhi, Masatoshi ; Ueno, Takuya
概要:
This study examines the long-term wave data observed along the coastline of the Sea of Japan. The focus was mainly placed on the wave climate at Wajima Port, which is located on the outer coast of the Noto Peninsula in Ishikawa
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Prefecture. The wave characteristics at Wajima were first compared with those at Kanazawa, which is located relatively close (90 km) to Wajima. The wave climate at Wajima and Kanazawa indicated similar features in terms of wave height and period. The influence of Noto Peninsula was substantial only in terms of the incoming wave direction. While neither a statistically significant trend nor jump was found for the long-term variation of annual wave height at these sites, an increasing trend and an abrupt jump around 1990 have been detected in the long-term variation of wave periods at Kanazawa. The wave periods in July have significantly increased at both Wajima and Kanazawa. The wave properties were then compared with those at Rumoi and Hamada Port, which are respectively located 830 km and 510 km away from Wajima. Over a long stretch of the Sea of Japan coast covering Rumoi, Wajima, Kanazawa, and Hamada, wave climate indicated similar and significant seasonal changes. The difference in the properties of significant waves around these four sites was about 10 %. Significant wave height and period correlated very well with second order polynomials at each site. In contrast, wave directions along the coastline indicated significant differences. At Rumoi and Hamada, neither significant trends nor jumps in long-term annual wave periods were detected. The statistical test revealed that the long-term increasing trends and abrupt jumps of wave period in summer were intrinsic to the waves at Wajima and Kanazawa, located in the central coastal areas adjacent to the Sea of Japan.
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6.
論文 |
早川, 和一 ; 塚脇, 真二
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木村, 繁男 ; 中村, 浩二
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木村, 繁男 ; 塚脇, 真二 ; 松木, 篤
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塚脇, 真二
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10.
論文 |
塚脇, 真二 ; 全, 希永 ; Hang, Peou
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