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气候突发事件
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     As compared to the records of the Greenland oxygen isotopes (GISP2), the δ 18 O curve of the Guizhou stalagmite showed that the Heinrich events 1,2,3,4 and the Dansgaard Oeschger IS1~IS11 warm events had been also recorded in the growth period of the stalagmite.
     石笋氧同位素曲线还显示了HeinrichH1 ,H2 ,H3和H4的突冷事件和Dansgaard Oeschger(D O)IS1~IS1 1的暖事件旋回 ,这表明北大西洋发生的气候突发事件 ,在低纬度的贵州地区找到了印记。 大西洋环流的终止和产生 ,可以通过大气内部的动力过程 ,影响到亚洲季风控制区。
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     On Emergent Public Events
     论突发公共事件
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     Cognition to public health emergencies
     对突发事件的认识
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     the extreme climatic events are in an increase trend.
     极端气候事件增加;
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     Events
     事件
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     MAIN PALAEOCLIMATIC EVENTS IN THE QUATERNARY
     第四纪的主要气候事件
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One of the most dramatic climate change events is the Younger Dryas,a return tonear-glacial conditions during~10-11 ka BP. that punctuated the last deglaciation,It be-gan and ended with large climatic shifts that took place very abruptly and globally.Possiblemechanisms that created these abrupt climatic shifts are under intense investigation. Many ofhypothesis are summarized in this paper.Although the cause of the Younger Dryas coolingremains an enigma a general consensus seems to be emerging that,the change...

One of the most dramatic climate change events is the Younger Dryas,a return tonear-glacial conditions during~10-11 ka BP. that punctuated the last deglaciation,It be-gan and ended with large climatic shifts that took place very abruptly and globally.Possiblemechanisms that created these abrupt climatic shifts are under intense investigation. Many ofhypothesis are summarized in this paper.Although the cause of the Younger Dryas coolingremains an enigma a general consensus seems to be emerging that,the change of oeean cur-rent,together with the modification and interaction of oceanic-atmospheric system mayprobably be the key to understanding the such analogoues events of sudden climatic changes。

发生于10─11ka左右的新仙女木事件是一次全球性的气候突然变冷事件。目前的有关其成因的各种假说都不能完全解释它的形成机制,本文通过对比世界各地的有关此事件的地质记录,综合评判各种假说,目前关于此事件的成因尚未搞清。现有的知识表明,洋流的改变及与之相伴随的海一气系统的重新调整,对理解此事件及与此类似的气候突发事件具有指导意义。

On the basis of the measurement by using thermal ionization mass spectrometry U series method, the ages of the stalagmite from the Guizhou Qixing cave ranged 43 020±960~12 650±290aB.P.,corresponding to MIS2 and the late of MIS3. The oxygen isotopic variability of the stalagmite revealed that the paleoclimatic changes can be divided into several stages: in the first stage (43 000~29 600aB.P.), corresponding to the late of MIS3, the δ 18 O values were generally lower than the average, and the climate...

On the basis of the measurement by using thermal ionization mass spectrometry U series method, the ages of the stalagmite from the Guizhou Qixing cave ranged 43 020±960~12 650±290aB.P.,corresponding to MIS2 and the late of MIS3. The oxygen isotopic variability of the stalagmite revealed that the paleoclimatic changes can be divided into several stages: in the first stage (43 000~29 600aB.P.), corresponding to the late of MIS3, the δ 18 O values were generally lower than the average, and the climate was warm wet and much rainy, which was agreement with the background of the low pressure in the Qinghai Xizang Plateau and the large amount of the vapor from Bengal Bay into this areas by the driving force of the Indian monsoon; in the second stage (29 600~14 600aB.P.), corresponding to MIS2, the δ 18 O values were higher than the average, the climate was cold dry and less rainy, which was consistent to the background of the maximum stage of the last glacial period; in the third stage 14 600~ 12 650 aB.P. corresponding to the late of MIS2 and the early of MIS1, the δ 18 O values were just lower than the average, the paleoclimate was getting warm wet. As compared to the records of the Greenland oxygen isotopes (GISP2), the δ 18 O curve of the Guizhou stalagmite showed that the Heinrich events 1,2,3,4 and the Dansgaard Oeschger IS1~IS11 warm events had been also recorded in the growth period of the stalagmite. $

用热电离质谱 (TIMS) -铀系法高精度地测定了贵州七星洞石笋的年龄 ,其生长年限为 43 0 2 0± 96 0~ 1 2 6 5 0± 2 90aB .P .,相当于深海氧同位素 2阶段到 3阶段后期。石笋的生长率变化反映了当时气候从暖湿多雨和印度洋季风强劲的环境 ,逐渐转化为冷干少雨、东亚冬季风强劲的环境。石笋的氧同位素变化表明 :43 0 0 0~ 2 96 0 0aB .P .相当于深海氧同位素 3阶段后期。该阶段δ18O平均值负于全阶段的平均值 ,气候暖湿多雨 ,此青藏高原夏季出现强的低气压 ,有利于印度洋季风携带孟加拉湾大量水汽进入青藏高原 ;2 96 0 0~ 1 46 0 0aB .P .相当于深海氧同位素 2阶段 ,该阶段δ18O平均值高于全阶段的平均值 ,气候冷干少雨 ,对应于末次盛冰期 ;1 46 0 0~ 1 2 6 5 0aB .P .阶段δ18O平均值略负于全阶段的平均值 ,气候向温湿趋势发展。石笋氧同位素曲线还显示了HeinrichH1 ,H2 ,H3和H4的突冷事件和Dansgaard Oeschger(D O)IS1~IS1 1的暖事件旋回 ,这表明北大西洋发生的气...

用热电离质谱 (TIMS) -铀系法高精度地测定了贵州七星洞石笋的年龄 ,其生长年限为 43 0 2 0± 96 0~ 1 2 6 5 0± 2 90aB .P .,相当于深海氧同位素 2阶段到 3阶段后期。石笋的生长率变化反映了当时气候从暖湿多雨和印度洋季风强劲的环境 ,逐渐转化为冷干少雨、东亚冬季风强劲的环境。石笋的氧同位素变化表明 :43 0 0 0~ 2 96 0 0aB .P .相当于深海氧同位素 3阶段后期。该阶段δ18O平均值负于全阶段的平均值 ,气候暖湿多雨 ,此青藏高原夏季出现强的低气压 ,有利于印度洋季风携带孟加拉湾大量水汽进入青藏高原 ;2 96 0 0~ 1 46 0 0aB .P .相当于深海氧同位素 2阶段 ,该阶段δ18O平均值高于全阶段的平均值 ,气候冷干少雨 ,对应于末次盛冰期 ;1 46 0 0~ 1 2 6 5 0aB .P .阶段δ18O平均值略负于全阶段的平均值 ,气候向温湿趋势发展。石笋氧同位素曲线还显示了HeinrichH1 ,H2 ,H3和H4的突冷事件和Dansgaard Oeschger(D O)IS1~IS1 1的暖事件旋回 ,这表明北大西洋发生的气候突发事件 ,在低纬度的贵州地区找到了印记。大西洋环流的终止和产生 ,可以通过大气内部的动力过程 ,影响到亚洲季风控制区。对于表征全球变化的事件是否具有同时性 ,还有待我们思考和研究。

 
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