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苏门答腊附近大气准双周振荡的可能维持机制 总被引:6,自引:0,他引:6
海洋大陆上空常年有对流存在, 特别是苏门答腊地区, 由于地形对气流的阻挡, 形成很强的对流中心[1]. 很多学者指出, 亚洲季风区对流首先在中南半岛上空活跃是冬季位于苏门答腊的热带对流沿大陆桥移动的结果[2~5], 强调了苏门答腊地区的对流活动在亚洲夏季风建立中的重要性. 自从在热带地区发现低频振荡[6]后, 研究表明热带大气低频活动有准双周QBWO (Quasi-Biweekly Oscillation)和准40 d MJO (Madden-Julian Oscillation)两个主要频带, 其中 QBWO在夏季风的建立过程中起到了主要作用[7~11]. 但目前对QBWO的认识并不如MJO那样深入, 特别是对其维持机制的认识. 本文利用气候平均(1980~ 2001年)TBB和NCEP/NCAR逐日再分析资料, 分析了季节转换时期(3~5月)苏门答腊附近对流QBWO及与热带印度洋低层环流的关系, 并对QBWO的可能维持机制进行讨论. ......... 相似文献
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一只幼狮正向另一只幼狮挥动右“拳”,对方闪身躲避。这一对居住在肯尼亚同一群体的两岁幼狮果真是在打架?它们尽管粗鲁咆哮,但没有龇牙咧嘴,它们的动作缺少攻击性而更具“芭蕾”风韵,它们其实是假打真玩。印度尼西亚苏门答腊岛森林中的猩猩用双脚钩住树枝,倒挂着身子喝水,不知道这只“猴子”是不是在“捞月”?但是可以肯定,它知道倒挂戏水,边玩边喝,其乐无穷。 相似文献
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Possible maintaining mechanism of climatological atmospheric quasi-biweekly oscillation around Sumatra 总被引:3,自引:0,他引:3
WENMin ZHANGRenhe 《科学通报(英文版)》2005,50(10):1054-1056
There are convective activities over the maritime continent during a whole year, especially over Sumatra, a vigorous center of convection due to the blocking of the surface topography. Many researchers have pointed out that the first commencement of the monsoonal convection over Indo-China peninsula is the result of the northward propagation of tropical convection over Sumatra along the“land bridge”, emphasizing the importance of the convective activities over Sumatra in the process of Asiansummer monsoon (ASM) onset. 相似文献
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LIU Ning CHEN QiFu NIU FengLin CHEN Yong 《科学通报(英文版)》2007,52(14):1986-1991
The Sumatra-Andaman earthquake on December 26, 2004 is the first well recorded gigantic earthquake (moment magnitude MW 9.3) by modern broadband seismic and Global Positioning System networks. The rich seismic and geodetic recordings have documented unprecedented details about the earthquake rupture, coseismic and postseismic deformations. This is a report of detailed images of the rupture process using the first-arriving compressional waves recorded by the China National Digital Seismic Network (CNDSN). An improved imaging condition was employed to account for the sparse distribution of the CNDSN stations. The resulting images are consistent with the major rupture features reported by previous seismic and geodetic studies. It is found that the earthquake rupture initiated at offshore of northwestern Sumatra and propagated in the north northwest direction at a speed of 2.7 ± 0.2 km/s. The rupture continued for at least 420 s and extended about 1200-1300 km along the Andaman trough with two bursts of seismic energy. 相似文献
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世纪海啸:那场人类的劫难2004年12月26日,发生在印度尼西亚苏门答腊岛海域的9级大地震及引发的海啸,夺去了 相似文献
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据媒体报道,俄罗斯科学家最近指出,大地震具有明显的周期性,而在期末地震活动会加强。例如,20世纪所有4次特大地震都发生在一个很短的时期内:1952年堪察加发生9.0级地震,1957年阿拉斯加安德烈亚诺夫群岛发生9.1级地震,1960年智利发生9.5级地震,1964年阿拉斯加威廉王子海峡发生9.2级地震。科学家认为,单独的个体不太可能具有这种密集性。 相似文献
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