http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Jiwen Teng (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
Why is the number of superplumes so limited?
Xiong Xiong,Uk Han,Rongshan Fu,Jiwen Teng 한국지질과학협의회 2002 Geosciences Journal Vol.6 No.2
Numerical simulation shows that the hot plumescan be formed by the self-accelerated process if local thermal per-turbation is present. Since the local thermal perturbation mayexist extensively near the CMB and the transition zone around670 km, the number of the hot plumes should be great. The coldplume seems to be originated by the subduction slabs. Because thesubduction belts distribute extensively on the Earths surface, thenumber of the cold plume should be also great. However, theobserved number of the superplumes is much less than the sup-posed ones. A simple 2D model of whole mantle convection isdesigned to investigate the interaction between plumes and ther-mal anomalies. The hot thermal anomalies (HTA) are imposed atCMB and a depth of about 670 km discontinuity, corresponding totwo plausible locations of the hot plumes origination. And, the coldthermal anomalies (CTA) are imposed near the surface and670 km discontinuity, corresponding to the subducted slabs andpossible accumulation of slabs at 670 km discontinuity. Thenumerical results show that the fixed HTA does not originate anew plume. It draws the hot plume to move towards itself and sta-bilizes the plume at its own position. The imposed free HTA movestowards the hot plume, and finally merge with the plume. The sit-uation for the CTA is similar to that for the hot one. From thenumerical results, we can reach the following conclusions. It isvery dificult for the HTA/CTA to originate a new hot/cold plumein a convective flow field. The boundary instability is suppressedby the developed plumes. Instead of originating new hot/coldplumes, the HTA/CTA interact with the plumes to form hugesuperplumes. This might be one reason for the question, why thenumber of the superplumes is so limited.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
