搜索结果: 136-150 共查到“知识库 海洋地球物理学”相关记录618条 . 查询时间(1.324 秒)
Observing Biogeochemical Cycles at Global Scales with Profiling Floats and Gliders: Prospects for a Global Array
Biogeochemical Cycles Global Scales
2015/7/6
Chemical and biological sensor technologies have advanced rapidly in the past five years. Sensors that require low power and operate for multiple years are now available for oxygen, nitrate, and a var...
Ocean data assimilation has matured to the point that observations are now routinely combined with model forecasts to produce a variety of ocean products. Approaches to ocean data assimilation vary wi...
Oceanographers today are more aware than ever of the importance of ocean science, particularly for understanding global issues such as climate change and the repercussions of fishing on ecosystems. No...
Stability and consistency of nonhydrostatic free-surface models using the semi-implicit
theta-method stability accuracy artificial damping free surface nonhydrostatic pressure ocean modeling
2015/6/30
The -method is a popular semi-implicit finite-difference method for simulating free-surface flows. Problem stiffness, arising because of the presence of both fast and slow timescale processes, is eas...
ANALYSIS OF THE SHORELINE POSITION EXTRACTED FROM LANDSAT TM AND ETM+ IMAGERY
Shoreline position Landsat imagery
2015/5/7
A statistical analysis of the results obtained by the tool SELI (Shoreline Extraction from Landsat Imagery) is made in order to characterise the medium and long term period changes occurring on beac...
海洋CSEM探测海底天然气水合物的有效异常研究
海洋CSEM 有效异常 归一化
2015/3/10
鉴于海洋CSEM响应对海底地层的电性变化比较灵敏,故可以依据水合物储层和围岩沉积层的CSEM响应差异,确定海底天然气水合物储层的分布范围。在考虑噪声情况下,通过建立一维含水合物储层模型,正演计算获得CSEM响应,进而求得有效异常、综合分析有效异常与发射频率及收发距的关系。研究表明,电磁响应的有效异常可用于确定合适的勘探频率,并由此获得相应的归一化振幅比和相位差曲线,利用有效异常对水合物储层电阻率变...
南海北部深水盆地流体活动系统及其成藏意义
流体运移 天然气水合物 南海北部
2014/12/31
根据高精度的3D和2D地震资料,对南海北部深水盆地的流体活动系统的类型、影响因素和它们之间的演化关系进行了研究.南海北部深水区存在着包括:泥火山、泥底辟、气烟囱、管状通道、多边形断层和构造断层等多种类型的流体活动系统.根据地震反射特征,可以把它们划分为断层有关的流体活动系统和柱状流体活动系统两大类.研究发现研究区内的流体活动系统主要受构造和沉积两方面的影响.并且,气烟囱、泥底辟和泥火山存在着单向演...
南黄海盆地基底及海相中、古生界地层分布特征
海相中 古生界盆地 基底结构 残留厚度
2014/12/31
南黄海盆地是大型海相中、古生界和陆相中、新生界两期叠合型盆地,本文根据最新地震资料结合钻井资料及与海陆地质资料的对比研究对盆地内地震层序进行了划分,得到了陆相中、新生界盆地基底即中、古生界海相盆地的顶界埋深、三叠系和上二叠统的残留厚度,推断了陆相层基底地层分布,并根据磁力异常资料推测了海相中、古生界盆地结晶基底埋深,推断了海相中、古生界整体残留情况.下三叠统青龙组和上二叠大隆及龙潭组在南黄海盆地南...
马尼拉海沟北段俯冲带输入板块的不均一性
输入板块 增生楔 多道地震
2014/12/31
本文整合了横跨马尼拉海沟北段的21条多道地震层位信息、海底地形以及天然地震数据,分析了研究区内的输入板块性质差异及其对增生楔变形和地震活动性的影响.研究发现,沿马尼拉海沟北段的输入板块在地壳性质、基底起伏和沉积物厚度上存在明显的自北向南的差异:(1)最北段基底埋深大,上覆沉积物厚,地壳厚度较薄,地壳性质可能为初始南海洋壳或者圈闭的菲律宾海洋壳;(2)中段基底埋深浅,上覆沉积物薄,地壳厚度大,地壳属...
我国海洋地学编图现状、计划与主要进展
地质学编图 编图计划 主要进展
2014/12/31
我国海洋地质地球物理工作起步晚,整体调查程度较低,进一步加强我国海洋地学编图显得十分必要.我国实施的"海洋地质保障工程",将分"中国海陆"、"中国海及邻域"和"中国各海区"三个层次来进行地学编图.第一层次编制了空间重力异常图、布格重力异常图、磁力异常图、地震层析成像图、莫霍面深度图、地质图、大地构造格架图和大地构造格架演化图等8种图件.编图反映出中国海陆重力异常是"线性异常带纵横交错,块状异常区坐...
一种新型海底沉积物声学原位测量系统的研制及应用
海底沉积物 声学参数 原位测量系统
2015/7/7
为了能够精确地测量海底表层沉积物的声学参数, 自主研制了一种新型海底沉积物声学原位测量系统, 与国内外传统的声学原位测量系统相比, 该系统能够实时显示声波波形, 调整测量参数, 其工作方式除了站位式测量之外, 还实现了拖行式连续测量, 极大地提高了工作效率.根据前期海试情况, 对海底仪器结构进行了重新设计, 使之可以同时测量海底沉积物及海底海水的声学参数, 同时建立了双向数字信道, 解决了测量过程...
Widespread variability in overnight patterns of ecosystem respiration linked to gradients in dissolved organic matter, residence time, and productivity in a global set of lakes
The ecological system lakes
2014/10/16
Widespread variability in overnight patterns of ecosystem respiration linked to gradients in dissolved organic matter, residence time, and productivity in a global set of lakes。
Nutrient availability affects the response of juvenile corals and the endosymbionts to ocean acidification
ocean acidification Juvenile coral
2014/10/16
The interactive effects of nutrient availability and ocean acidification on coral calcification were investigated
using post-settlement juvenile corals of Acropora digitifera cultured in nutrient-suf...
Stratification and horizontal exchange in Lake Victoria, East Africa
Stratification horizontal exchange Lake Victoria East Africa
2014/10/16
We characterize stratification patterns over diel, seasonal, and annual time scales in inshore and offshore regions of Lake Victoria, East Africa; determine conditions leading to horizontal exchanges;...
Nitrogen fixation and dissimilatory nitrate reduction to ammonium (DNRA) support nitrogen dynamics in Texas estuaries
Nitrogen fi xation dissimilatory nitrate
2014/4/30
We conducted continuous-flow experiments on intact sediment cores from Laguna Madre, Sabine Lake, East
Matagorda Bay, and Nueces Estuary to evaluate internal nitrogen (N) sources, sinks, and re...