基于SODA资料的南海表层风能输入的空间分布与长期趋势研究

海面风不仅是驱动上层海洋运动的主要动力, 其能量也是维持海洋表层流动的主要机械能来源。为了分析南海表层流风能输入的变化, 用SODA(Simple Ocean Data Assimilation)(1901—2010)资料估算了风向南海表层流(表层地转流+表层非地转流)的能量输入。结果表明, 风向南海表层流、表层地转流和表层非地转流输入的能量总体均呈减少趋势, 110年间分别减小了约56%、65%和49%。导致风能输入减小的最主要因素是风应力的减弱(减小了35%)。由于南海受季风系统的控制, 风向表层流及其各成分输入的能量呈现出显著的季节性变化。冬季风能输入最强, 高值区位于南海西部及北部区域, 呈一个显著的“回力镖”状结构。这些结果对深入认识南海环流具有理论意义。     

Modeling a Shore Profile Formed by Storm Cycle Impact

Oceanology - A model is developed for predicting the sand shore profile formed by storm event impact. The model takes into account the cumulative effect of elementary processes responsible for...     

Phytocenoses of the Ob Estuary and Kara Sea Shelf in the Late Spring Season

Oceanology - Based on the material obtained in the spring–summer season of 2016, the composition and quantitative distribution of phytoplankton in the Ob estuary and over the Kara Sea shelf...     

Comprehensive Geological–Geophysical and Botanic Study of the Tectonic Junction Zone between the Katun Ridge and Uimon Depression (Altai Mountains)

Izvestiya, Atmospheric and Oceanic Physics - Areas with large gradients and anomalous variations in geomagnetic and radiation fields have been revealed and mapped at the northwestern foot of the...     

Modern Geodynamics and Focal Mechanisms of Earthquakes near the Bushehr Nuclear Power Plant

Izvestiya, Atmospheric and Oceanic Physics - A method for determining the focal mechanisms of earthquakes using the S-wave polarization direction for weak close seismic events is developed based on...     

新一代区域海-气-浪耦合台风预报系统

依托国家重点基础研究（973）计划项目"上层海洋对台风的响应和调制机理研究",中国气象局上海台风研究所联合国家海洋局的相关单位,通过实施近海台风的外场观测科学试验、加强台风边界层（特别是海气相互作用）物理过程诊断分析及参数化方案等的研究,建立并改进了台风强度预报的海-气-浪耦合预报模式系统,并在此基础上发展了台风强度的集合预报技术,在历史典型台风个例和2016-2017年台汛期的业务化测试中表现出良好的预报性能。     

海洋表层沉积物中金属镉的来源解析

利用2015年8月份对长江口及其邻近海域表层沉积物的监测数据,基于主成分分析/绝对主成分分数(PCA/APCS)受体模型定量解析了重金属元素镉(Cd)的可能来源,并结合地统计学插值了Cd的源贡献量的空间分布状况,结果表明沉积物中镉污染主要存在3个可能来源,源头及贡献率分别为工业污染(18.8%)、陆地径流输入(66.0%)、生物活动等自然因素(13.6%),并且各个源头贡献量具有不同的空间分布状况,其中工业污染的高值区主要集中在靠近陆地区域,陆地径流输入的分布呈现由近岸向外海逐减降低的特征,生物活动等自然因素的高值区主要集中在远离陆地的外海区域。     

深水弯曲水道几何形态定量分析——以赤道几内亚Rio Muni盆地为例

深水水道作为深水沉积体系中重要的沉积单元之一,一直是深水沉积和地层研究的热点。基于西非几内亚湾Rio Muni盆地陆坡区的高分辨率三维地震资料,利用地震属性及参数定量分析法对第四系陆坡重力流水道的剖面和平面形态进行了研究,旨在探索深水水道内部结构的相互影响和外部因素对水道形态的控制,丰富深水沉积学理论。研究表明：坡度及距水道头部距离影响了深水水道的剖面和平面形态,随着坡度变缓,距水道头部距离越远,水道宽度越小;堤岸于中、下陆坡开始发育,水道堤岸脊的高程差及内、外弯曲带都不同程度地影响了堤岸的长度;水道的弯曲度控制着堤岸脊高程差的变化,同时作用于堤岸长度的变化;样本水道为高弯曲水道,且弯曲度受地形坡度控制。     

全新世以来苏北平原里下河南部地区的沉积记录和环境演化

通过对里下河南部泰州地区PM4剖面样品的微体古生物鉴定及粒度分析,结合AMS14C测年,探讨了该地区全新世以来沉积环境的演化。研究结果表明,全新世以来,该地区的沉积环境经历了湖相、滨海沼泽、海湾、瀉湖、湖相5个阶段。11900~4850cal.aBP：沉积物颜色为灰色-灰黑色,颗粒较细,为极正偏的尖峰态,水动力条件较弱,不含有孔虫和介形虫,为湖相沉积;4850~4250cal.aBP：水动力增强及粗颗粒沉积物增加,含有少量有孔虫,为滨海沼泽;4250~4050cal.aBP：砂质成分急剧增加,含有大量有孔虫,位于黄桥沙坝的北汊道内,为海湾沉积;4050~1850cal.aBP：粒度变细,水动力减弱,含有少量有孔虫及介形虫,为瀉湖沉积;1850~0cal.aBP：粒度变细,分选变好,水动力条件较弱,不含有孔虫,含有少量介形虫,为湖相沉积。     

Experimental Study on Sloshing Characteristics in the Elastic Tank Based on Morlet Wavelet Transform

Hydroelastic effect of sloshing is studied through an experimental investigation. Different excitation frequencies are considered with low-fill-depth and large amplitude. Morlet wavelet transform is introduced to analyze the free surface elevations and sloshing pressures. It focuses on variations and distributions of the wavelet energy in elastic tanks. The evolutions of theoretical and experimental wavelet spectra are discussed and the corresponding Fourier spectrums are compared. Afterwards, average values of the wavelet spectra are extracted to do a quantitative study at various points. From the wavelet analysis, sloshing energies are mainly distributed around the external excitation frequency and expanded to high frequencies under violent condition. In resonance, experimental wavelet energy of the elevation in elastic tanks is obviously less than that in the rigid one; for sloshing pressures, the elastic wavelet energy close to the rigid one and conspicuous impulse is observed. It recommends engineers to concern the primary natural frequency and impulsive peak pressures.