Past and future polar amplification of climate change: climate model intercomparisons and ice-core constraints   总被引：1，自引：0，他引：1  

V. Masson-Delmotte  M. Kageyama  P. Braconnot  S. Charbit  G. Krinner  C. Ritz  E. Guilyardi  J. Jouzel  A. Abe-Ouchi  M. Crucifix  R. M. Gladstone  C. D. Hewitt  A. Kitoh  A. N. LeGrande  O. Marti  U. Merkel  T. Motoi  R. Ohgaito  B. Otto-Bliesner  W. R. Peltier  I. Ross  P. J. Valdes  G. Vettoretti  S. L. Weber  F. Wolk  Y. Yu 《Climate Dynamics》2006,27(4):437-440

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Luminescence investigation of loess and tephra from Halfway House section, Central Alaska     

Marie Auclair  Michel Lamothe  France Lagroix  Subir K. Banerjee 《Quaternary Geochronology》2007,2(1-4):34-38

Infrared stimulated luminescence (IRSL) properties of the Old Crow tephra and bracketing loess from the Halfway House site in Central Alaska are investigated in order to test newly developed techniques, including SAR and recently proposed fading corrections. Loess samples investigated show a standard growth of luminescence with regenerative dose while the tephra sample is less sensitive by an order of magnitude and saturates at lower dose. The growth curves obtained using multiple-aliquots regeneration (MAR) saturate at a higher value than those with the single-aliquot regeneration (SAR) protocol. Fading rate determinations for these samples are shown to be imprecise and no noticeable difference was observed between loess and tephra materials. Anomalous fading corrections using an average g value of 5% are applied to the natural test dose signal intensity using the dose rate correction (DRC) method. IRSL ages obtained for loess are in agreement with the expected age while the tephra age is lower than expected, suggesting the measured fading rate is underestimated for this material.  相似文献   

云南澜沧-耿马Ms7.6地震的完全库仑破裂应力变化与后续地震的动态、静态应力触发   总被引：1，自引：0，他引：1  

吴小平  虎雄林  Michel Bouchon  黄雍  胡家富  解朝娣  王绍晋  胡毅力 《中国科学D辑》2007,37(6):746-752

计算和研究了1988年云南澜沧-耿马Ms7.6地震产生的完全库仑破裂应力变化的时空演化图像, 对继澜沧地震13 min后发生的耿马M7.2地震的应力触发问题进行了分析, 同时也对澜沧-耿马地震后24 d内发生的Ms5.0~6.9后续强余震的应力触发问题进行了探讨. 结果显示, 澜沧地震断层破裂产生的完全库仑破裂应力变化空间分布图像具有很强的非对称性, 正值的动态和静态库仑破裂应力变化区域均具有与强余震分布位置吻合较好的现象. 耿马Ms7.2地震受到了澜沧Ms7.6地震产生动态和静态库仑破裂应力的触发作用; 绝大多数后续强余震受到了动、静态库仑破裂应力的综合触发作用.  相似文献   

Luminescence dating of a gigantic palaeolandslide in the Gobi-Altay mountains, Mongolia     

S. Balescu  J-F. Ritz  M. Lamothe  M. Auclair  M. Todbileg 《Quaternary Geochronology》2007,2(1-4):290-295

In an attempt to date a palaeolandslide that took place along the Baga Bogd Massif, in Mongolia, the infrared stimulated luminescence (IRSL) method has been applied to lacustrine silty sediments directly overlying the landslide mass. The IRSL age estimates obtained on alkali feldspar grains (>40 μm) and polymineral fine grains (4–11 μm) provide a minimum age for the landslide event. The IRSL ages on alkali feldspars corrected for long-term fading using the protocol of Mejdahl (1988, 1989) suggest that the palaeolandslide occurred at the beginning of the Last Interglacial. These are in good agreement with the ¹⁰Be cosmogenic dates obtained on faulted and abandoned alluvial fans in the Gobi-Altay mountains. This study demonstrates for the first time that the IRSL dating method can successfully be applied for establishing landslide chronologies.  相似文献   

Correcting superconducting gravity time-series using rainfall modelling at the Vienna and Membach stations and application to Earth tide analysis     

Bruno Meurers  Michel Van Camp  Toon Petermans 《Journal of Geodesy》2007,81(11):703-712

We demonstrate the possibility to improve the signal-to-noise ratio of superconducting gravity time-series by correcting for local hydrological effects. Short-term atmospheric events associated with heavy rain induce step-like gravity signals that deteriorate the frequency spectrum estimates. Based on 4D modeling constrained by high temporal resolution rain gauge data, rainfall admittances for the Vienna and Membach superconducting gravity stations are calculated. This allows routine correction for Newtonian rain water effects, which reduces the standard deviation of residuals after tidal parameter adjustment by 10%. It also improves the correction of steps of instrumental origin when they coincide with step-like water mass signals.  相似文献   

The Visible Solar Spectral Irradiance from 350 to 850 nm As Measured by the SOLSPEC Spectrometer During the ATLAS I Mission     

Gérard Thuillier  Michel Hersé  Paul C. Simon  Dietrich Labs  Holger Mandel  Didier Gillotay  Thomas Foujols 《Solar physics》1998,177(1-2):41-61

The SOLSPEC instrument has been built to carry out solar spectral irradiance measurements from 200 to 3000 nm. It consists of three spectrometers designed to measure the solar spectral irradiance in ultraviolet, visible, and infrared domains. It flew with the ATLAS I mission in March 1992. This paper is dedicated to the visible part of the solar spectrum. Comparisons with recent data are shown and differences below 450 nm are discussed.  相似文献   

Magnetostratigraphy of the lower Triassic volcanics from deep drill SG6 in western Siberia: evidence for long-lasting Permo–Triassic volcanic activity     

Michel Westphal  Evgueni L. Gurevitch  Boris V. Samsonov  Hugues Feinberg  & Jean Pierre Pozzi 《Geophysical Journal International》1998,134(1):254-266

The deep drill hole SG6 in western Siberia (66°N, 78.5°E) penetrated 1.1  km of lower Triassic basalts, which are possibly an extension of the central Siberian Permo– Triassic flood basalt province. About 300 samples of these basalts were progressively demagnetized and measured. Principal component analysis often shows multiple magnetizations carried by haematite and magnetite. The corrected mean inclinations are +77° and −77° for the haematite component. A magnetostratigraphic scale was derived and showed a N–R–N–R–N succession. This is quite different from the Noril'sk and Taimyr typical polarity scale, R–N.
  The basalts found in the SG6 deep drill hole are slightly younger than those of central Siberia and Taimyr. They correspond to middle–upper Induan age, whereas the Noril'sk and Taimyr sections correspond to an uppermost Permian and lower Induan age. Altogether they indicate that, after a high output rate of volcanic material near the Permo–Triassic boundary, this activity slowed down drastically on the Siberian platform and Taimyr, but persisted for several million years in western Siberia.  相似文献   

Possible mechanisms causing failure of Thellier palaeointensity experiments in some basalts     

Andrei A. Kosterov  & Michel Prévot 《Geophysical Journal International》1998,134(2):554-572

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Interpretation of cosmogenic nuclides in meteorites on the basis of accelerator experiments and physical model calculations     

R. Michel  S. Neumann 《Journal of Earth System Science》1998,107(4):441-457

Cosmogenic nuclides in extraterrestrial matter provide a wealth of information on the exposure and collision histories of small objects in space and on the history of the solar and galactic cosmic radiation. The interpretation of the observed abundances of cosmogenic nuclides requires detailed and accurate knowledge of their production rates. Accelerator experiments provide a quantitative basis and the ground truth for modeling cosmogenic nuclide production by measurements of the relevant cross sections and by realistic simulations of the interaction of galactic protons with meteoroids under completely controlled conditions, respectively. We review the establishment of physical model calculations of cosmogenic nuclide production in extraterrestrial matter on the basis of such accelerator experiments and exemplify this approach by presenting new experimental and theoretical results for the cosmogenic nuclide⁴⁴Ti. The model calculations describe all aspects of cosmogenic nuclide production and allow the determination of long-term solar and galactic cosmic ray spectra and a consistent interpretation of cosmogenic nuclides in extraterrestrial matter.  相似文献   

A Note on Extension Variances in IR2     

Chadœuf  Joël  Moran  Chris  Goulard  Michel 《Mathematical Geosciences》1998,30(6):575-587

Matheron (1971) proposed an approximation of the extension variance in IR. We propose in this note an extension of this formula in IR ² , based on a MacLaurin formula. Its application is shown in an example, the estimation of the maximum depressional storage of a soil surface.  相似文献