利用地下流体氦同位素比值估算大陆壳幔热流比例   总被引：12，自引：2，他引：10  

汪洋 《地球物理学报》2000,43(6):762-770

地下流体中的氦同位素 3He来自地幔的排气作用 ,4He则是铀、钍衰变的产物 .由于铀、钍元素在大陆地壳中富集 ,4He通量与地壳热流呈正相关关系 ;同时 3He通量与地幔热流之间呈正相关 .所以地下流体的氦同位素比值 （3He / 4 He）与大陆壳幔热流比值 （qc/qm）呈反相关关系 .根据欧亚大陆和加拿大地盾的地下流体氦同位素比值数据和相应的壳幔热流比值数据 ,统计出 qc/ qm 与 3He / 4 He之间的回归关系 :qc/ qm =0 81 5- 0 30 0ln（3He / 4 He） ;此处 3He/ 4 He的单位是RA（大气的 3He/ 4 He比值 ） .有了地表热流值和壳幔热流比值即可得到地壳热流和地幔热流 .利用该公式以及热流值估算了中国主要盆地的壳幔热流值 ;根据这些数值得出的热岩石圈厚度和地壳平均生热率结果与地震学研究成果一致 .氦同位素比值是区分大陆热流中地壳热流值和地幔热流值的有用参数 .  相似文献   

胶东半岛温泉的地热特征     

金秉福  张云吉  栾光忠 《水文地质工程地质》2000,27(5):31-33,37

胶东半岛位于欧亚板块与太平洋板块边缘内侧,是地壳长期稳定缓慢隆起地段,区内地质构造发育,大部分温泉出露在背斜核部,ＮＥ、ＮＮＥ向与ＮＷ、ＮＮＷ向断裂交泯外,地热系统属中低温深循环对流型,略为偏高的大地热流是其主要热源,地表水是地下热水的补给水源,地下水通过发育在花岗岩和变质岩中的断层或断裂破碎带,下渗和深循环对流,在径流过程中不断吸取围岩热量成热水,沿断裂上升过程中,与地下浅部裂隙水混合而成为化学  相似文献   

广东三坑地热田形成条件及开发潜力分析     

叶闻文 《水文地质工程地质》2000,27(3):16-18

广东三坑地热田位于吴川－四会深大断裂带的东北侧,三坑向斜岩溶盆地内。地下热水主要赋存于ＮＥ与ＮＷ向断裂构造及其交汇部位的岩溶裂隙发育带中。根据地热地质条件及水热对流系统分析,地下热水是在水热对流系统中由深循环高温构造裂隙水与浅循环８常温岩溶水混合而成。三坑地热田热水资源具有水温适中、水量丰富、水质良好、动态稳定等特点。开发潜力很大。  相似文献   

渤海海冰特征厚度分析   总被引：8，自引：2，他引：6  

季顺迎  岳前进 《海洋学报》2000,22(6):117-123

通过海冰生消机理和数值试验,讨论了渤海海冰特征厚度的存在条件;对不同厚度的海冰表面温度、冰面热量收支、冰面下热传导和太阳辐射透射量进行了对比分析,分析了渤海海冰向特征冰厚的动态演化过程;在不同气温、风速、相对湿度和海洋热通量等气象和水文条件下,对渤海特征冰厚进行了计算;讨论了海冰生消的动态平衡过程,分析了1997/1998年冬季辽东湾JZ20-2海域实测冰厚与特征冰厚的相互关系。对渤海特征冰厚分析将有助于渤海海冰数值模拟工作的开展和对不同重现期设计冰厚的推算。  相似文献   

Numerical simulation of transport and dispersion of side-discharged sewage in tidal flow     

Liang Shuxiu  Shen Yongming  Sun Zhaochen  Ni Haoqing 《海洋学报(英文版)》2000,19(2):137-144

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Properties of flux tubes and the relation with solar irradiance variability     

M. Fligge  S. K. Solanki 《Journal of Astrophysics and Astronomy》2000,21(3-4):275-282

At the solar surface the magnetic field is bundled into discrete elements of concentrated flux, often referred to as magnetic flux tubes, which cover only a small fraction of the solar surface. Flux tubes span a whole spectrum of sizes, ranging from sunspots to features well below the best currently obtainable spatial resolution. Whereas sunspots have been well studied, our knowledge of the true brightness of small-scale magnetic features is hampered by the insufficient spatial resolution of the observations. A better understanding of the thermal and magnetic properties of these small-scale features, however, is crucial for an understanding of (climate-relevant) long-term solar irradiance variations.  相似文献   

Convection in the Earth's core driven by lateral variations in the core–mantle boundary heat flux     

Steven John Gibbons  & David Gubbins 《Geophysical Journal International》2000,142(2):631-642

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Possible magma intrusion revealed by temporal gravity, ground deformation and ground temperature observations at Mount Komagatake (Hokkaido) during the 1996–1998 crisis     

Philippe Jousset  Hitoshi Mori  Hiromu Okada 《Geophysical Journal International》2000,143(3):557-574

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Nomogram for the Height of the Daytime Mixed Layer     

Kenneth Nyrén  Sven-Erik Gryning 《Boundary-Layer Meteorology》1999,91(2):307-322

A method to construct a nomogram of the daytime mixed-layer-height evolution is presented. The nomogram will be specific for a given location and land surface type and is intended to be an easy tool to achieve a general understanding of mixed-layer behaviour. Also it is a pedagogical graphical one-pager that displays the bulk of data that controls the evolution of the mixed layer. Nomograms from northern, central and southern Europe are presented and discussed. Comparison with data from two sites shows good agreement although the nomograms overestimated the mixing height when it was low.  相似文献   

CHARACTERISTICS OF 10-DAY MEAN SURFACE SENSIBLE HEAT FLUX VARIATIONS IN THE SCS MONSOON REGION AND POSSIBLE CONNECTIONS WITH THE SCS SUMMER MONSOON ONSET^*     

Zhang Yaocun  Qian Yongfu 《Acta Meteorologica Sinica》1999,13(1):11-20

The time and space variations of the ten-day mean surface sensible heat flux have been analyzed in this paper based on the data of NCEP/NCAR from January of 1979 to December of 1995 in the South China Sea (SCS) monsoon region.It is found that large variations of the surface sensible heat flux standard deviations exist in the northwestern Indochina Peninsula and the Indian Peninsula regions,and their locations and strength change significantly during the onset period of SCS monsoon.The negative deviations appear evidently earlier in the Indocbina Peninsula than in the Indian Peninsula but the deviation strength in the Indian Peninsula is stronger than that in the Indochina Peninsula.The appearance of the zonal negative mean deviations in the southern part of the Indochina Peninsula corresponds to the date of the SCS summer monsoon onset,while the occurrence of the deviation decrease corresponds to the date of the South Asian monsoon onset.The sensible heat flux increases dekad by dekad before the onset of the summer monsoon in the Indian Peninsula and the Indochina Peninsula and decreases after the monsoon onset.Therefore,the surface sensible heat flux changes in the Indochina and the Indian Peninsula regions maybe have some connections with the SCS monsoon onset and the Indian monsoon onset,and the Indochina Peninsula maybe becomes the sensitive or key region to the SCS monsoon onset and the land maybe plays an important role in triggering summer monsoon onset.  相似文献