共查询到20条相似文献，搜索用时 126 毫秒
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V. G. Eselevich V. M. Bogod I. V. Chashey M. V. Eselevich Yu. I. Yermolaev 《Geomagnetism and Aeronomy》2009,49(1):133-135
The solar sources of the magnetic storms of November 8 and 10, 2004, are analyzed. The preliminary results of such an analysis [Yermolaev et al., 2005] are critically compared with the results of the paper [Tsurutani et al., 2008], where solar flares were put in correspondence with these magnetic storms. The method for determining solar sources that cause powerful magnetospheric storms is analyzed. It has been indicated that an optimal approach consists in considering coronal mass ejections (CMEs) as storm sources and accompanying flares as additional information about the location of CME origination. 相似文献
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Studia Geophysica et Geodaetica - 相似文献
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Bruce W.MELVILLE 《国际泥沙研究》2002,(4)
1 FLOW INTENSITY, PF Local scour processes differ between clear-water (sub-threshold) and live-bed (post-threshold) conditions of sediment transport on the channel bed ahead of the bridge abutment. As described by Melville and Coleman (2000), the stage of sediment transport can be represented by the mean velocity ratio U/Uc, termed the flow intensity. For U/Uc 1, clear-water conditions pertain, while live-bed scour occurs for U/Uc > 1. The variation of local scour depth at bridge … 相似文献
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LI TieGang SUN RongTao ZHANG DeYu LIU ZhenXia LI Qing & JIANG Bo Key Laboratory of Marine Geology Environment Institute of Oceanology Chinese Academy of Sciences Qingdao China Graduate School of Chinese Academy of Sciences Beijing China School of Resources & Environment Engineering Shandong University of Technology Zibo China The First Institute of Oceanography State Oceanic Administration Qingdao China 《中国科学D辑(英文版)》2007,50(5):725-735
The evolution and variation history of the Tsushima warm current during the late Quaternary was reconstructed based on the quantitative census data of planktonic foraminiferal fauna, together with oxygen and carbon isotope records of mixed layer dweller G. ruber and thermocline dweller N. dutertrei in piston core CSH1 and core DGKS9603 collected separately from the Tsushima warm current and the Kuroshio dominated area. The result showed that the Tsushima warm current vanished in the lowstand period during 40―24 cal ka BP, while the Kuroshio still flowed across the Okinawa Trough, arousing strong upwelling in the northern Trough. Meanwhile, the influence of freshwater greatly increased in the northern Okinawa Trough, as the broad East China Sea continental shelf emerged. The freshwater reached its maximum during the last glacial maximum (LGM), when the upwelling obviously weakened for the lowest sea-level and the depression of the Kuroshio. The modern Tsushima warm current began its development since 16 cal ka BP, and the impact of the Kuroshio increased in the middle and north- ern Okinawa Trough synchronously during the deglaciation and gradually evolved as the main water source of the Tsushima current. The modern Tsushima current finally formed at about 8.5 cal ka BP, since then the circulation structure has been relatively stable. The water of the modern Tsushima cur- rent primarily came from the Kuroshio axis. A short-term wiggle of the current occurred at about 3 cal ka BP, probably for the influences from the enhancement of the winter monsoon and the depression of the Kuroshio. The cold water masses greatly strengthened during the wiggle. 相似文献
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