Typhoon-Induced Variability of the Oceanic Surface Mixed Layer Observed by Argo Floats in the Western North Pacific Ocean     

《大气与海洋》2012,50(4):4-14

This study takes advantage of the newly established observational network of Argo floats to investigate the variability of the oceanic surface mixed layer (ML) in response to typhoons occurring over the period 2000–08 in the western North Pacific Ocean. After removing the background variability due to the seasonal cycle, the regionally averaged ML response is statistically analyzed as a function of the distance from the typhoon centre, the time after typhoon passage, the geographic location, the translation speed of the typhoon and the pre-existing patterns of oceanic circulation. Based on an unprecedented amount of new observational data, our analysis reveals some notable differences between ML temperature and ML depth changes induced by a typhoon, including the delayed response of ML temperature relative to ML depth, the longer restoring time of ML temperature, and the tendency of pre-existing cold-core features to favour ML cooling while warm-core features favour ML deepening.

RÉSUMÉ?[Traduit par la rédaction] La présente étude tire profit du nouveau réseau de balises d'observation Argo qui étudie la variabilité de la couche de mélange de la surface océanique en réponse aux typhons survenus durant la période 2000–2008 dans l'ouest du Pacifique Nord. Après avoir éliminé la variabilité de fond due au cycle saisonnier, nous faisons une analyse statistique de la réponse de la couche de mélange, moyennée dans une région, en fonction de la distance du centre du typhon, du temps écoulé depuis le passage du typhon, du lieu géographique, de la vitesse de déplacement du typhon et des configurations de circulation océanique préexistantes. En se basant sur une quantité sans précédent de nouvelles données d'observation, notre analyse révèle des différences notables entre les changements de température et de profondeur de la couche de mélange produits par le typhon, y compris la réponse retardée de la température de la couche de mélange par rapport à la profondeur de la couche de mélange, le temps de rétablissement plus long de la température de la couche de mélange et la tendance des caractéristiques de noyaux froids préexistantes à favoriser le refroidissement de la couche de mélange pendant que les caractéristiques de noyaux chauds favorisent l'approfondissement de la couche de mélange.  相似文献   

充电联合剖面新法在地质填图中的应用效果     

陈新奇 《中国煤炭地质》2009,(2):54-55

充电联合剖面新法是在常规联合剖面的基础上．对其装置进行改进,将无穷远极缩短至有限近源点,并设置在预计可能存在的被探测地质体附近。改进后的充电联合剖面新法要求对充电点C与测量点MN的距离进行重新计算,即求得各测点CM、CN之后,然后再计算出和测点的K^A、K^B及K^AB。系数,进而计算ρsA,ρs^B。充电联合剖面新法在昌福山、高陂两个勘探区应用实践表明,该法相对常规联合剖面,对断层及煤岩层的异常反应强烈,交点明显,位置反映准确．配合地质填图可取得较好效果。  相似文献   

Morphobathymetric analysis and evidence of submarine mass movements in the western Gulf of Taranto (Calabria margin,Ionian Sea)     

M. Rebesco  R. C. Neagu  A. Cuppari  F. Muto  D. Accettella  R. Dominici  A. Cova  C. Romano  A. Caburlotto 《International Journal of Earth Sciences》2009,98(4):791-805

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Evaluating the contribution of satellite measurements to the re-construction of three-dimensional ocean temperature fields in combination with Argo profiles     

Jian Chen  Hengqian Yan  Senliang Bao  Xindong Cui  Chengzu Bai  Huizan Wang 《海洋学报(英文版)》2022,41(2):65-79

Assimilation systems absorb both satellite measurements and Argo observations. This assimilation is essential to diagnose and evaluate the contribution from each type of data to the reconstructed analysis, allowing for better configuration of assimilation parameters. To achieve this, two comparative reconstruction schemes were designed under the optimal interpolation framework. Using a static scheme, an in situ-only field of ocean temperature was derived by correcting climatology with only Argo ...  相似文献   

延庆─怀来地区地壳细结构──利用深地震反射剖面   总被引：37，自引：13，他引：37       下载免费PDF全文

张先康  王椿镛 《地球物理学报》1996,39(3):356-364

１９９２年底在延庆－怀来地区实施了深地震反射剖面测量，目的是通过对该区地壳细结构的研究来探讨延庆－怀来盆地形成演化的机制和过程，以及与该区地震活动图像的关系．结果表明，研究区上部地壳总体上呈“透明”性质，厚２５－２６ｋｍ；下部地壳具有强烈的反射性质，厚约１４－１５ｋｍ．壳幔过渡带是由双程走时约２ｓ和厚约５－６ｋｍ的水平反射叠层所组成，莫霍界面具有深度深（约３９－４０ｋｍ）和平坦的特点。  相似文献   

赴美国康奈尔大学进行INDEPTH合作研究小结     

高锐  车敬凯  郭景如 《地球学报》1996,17(2):187-194

本文扼要地介绍了美国康奈尔大学深地层反射剖面技术特点和中美双方合作研究采用的处理流程，以及对ＩＮＤＥＰＴＨ反射地震剖面的地质解释和主要认识。文章后半部分主要介绍了美国康奈尔大学与ＩＮＤＥＰＴＨ相关的若干学术活动和他们进行大陆岩石图研究的主要方法。  相似文献   

Depth imaging of basalt flows in the Faeroe–Shetland Basin     

Moritz M. Fliedner  Robert S. White 《Geophysical Journal International》2003,152(2):353-371

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第十届大陆及其边缘的深部地震剖面国际研讨会概述     

秦义龙 《国际地震动态》2003,(6):16-21

第十届大陆及其边缘的深部地震剖面国际研讨会于2003年1月6—10日在新西兰陶波召开。文章首先简介了本次会议的概况，然后详细介绍了深部地震测深数据的处理解释新方法、经典地学断面以及与青藏高原和地震各向异性有关的报告内容，最后提出一些个人的看法。  相似文献   

Geophysical profiling across the Sulu ultra-high-pressure metamorphic belt, eastern China     

Wencai Yang   《Tectonophysics》2002,354(3-4)

The largest ultra-high pressure metamorphic (UHPM) belt in the world is located along the Dabie–Sulu region, which tectonically belongs to the east part of the central orogenic belt of China. Integrated geophysical investigations of using deep seismic reflection, MT, and geothermal observations have been carried out in the Sulu area since 1997. The results of integrated interpretation suggest the existence of three features: (1) a rift beneath the Lianshui basin by the Jiashan–Xionshui fault; (2) a special crustal pattern, called the magmatic multi-arch structure occurs beneath the northern Sulu UHPM zone; and (3) a northwest-dipping regional thrust crosses the Sulu crust, representing the intracontinental subduction of the Yangtze craton beneath the Sulu metamorphic belts after collision between the Yangtze and Sino-Korean cratons. A magmatic multi-arch structure consists of some arched reflectors that occur in both the lower and the upper crust where arched reflectors coincide with granitoid plutons. The multi-arch structures are common in eastern China where many Mesozoic granitoid plutons of different scales occur. The crustal structures in the Sulu metamorphic belts resulted from intensive dynamic processes following the Triassic collision between the Yangtze and Sino-Korean cratons. The formation and exhumation of UHPM rocks followed the collision, and then intracontinental subduction of the Yangtze craton beneath the Dabie–Sulu terranes took place in the early and middle Jurassic. In the late Jurassic, the Sulu lithosphere turned to an extensional regime, large-scale granitic intrusions occurred in eastern China; these likely resulted from lithospheric thinning and asthenospheric uplifting. The granitic intrusions came to a climax during the Cretaceous and were followed by rifting along existing faults in the early Eogene, resulting in many petroleum basins. The granitoid emplacement that generated the magmatic multi-arch structure and the rift were consequences of the lithospheric thinning process, and deep intracontinental subduction of the Yangtze craton beneath the Sulu metamorphic belt might partially contribute to the lithospheric thinning.  相似文献   

TRANSALP—Cross-line recording during the seismic reflection transect in the Eastern Alps     

Karl Millahn  Ewald Lüschen  Helmut Gebrande  TRANSALP Working Group 《Tectonophysics》2006,414(1-4):39

Cross-line recording formed a companion experiment of the TRANSALP seismic reflection transect through the Eastern Alps, conducted by partner institutions from Austria, Germany and Italy in three field campaigns in the period fall 1998 to fall 1999. Besides of the originally expected three-dimensional control for the north–south running main transect, additional information on seismic anisotropy and alternative images of crucial parts of the main transect could be gained.Conventionally processed sections along N–S running common-midpoint (CMP) binning lines confirm and strengthen the predominance of midcrustal reflective structures of the ‘Sub-Tauern-Ramp’ beneath and south of the Tauern Window. Velocity analysis of the first arrivals exhibit about 10% higher velocities in east–west propagating P-waves, compatible with texture-dominated rock anisotropy, recorded on cross-lines at the Tauern Window. Pre-stack depth migration of cross-line recordings shows dominant south dip of the Sub-Tauern-Ramp with easterly dip components and a sub-horizontal root zone of the Sub-Dolomites-Ramp.  相似文献