Thermodynamic properties of snow cover on sea ice during the austral summer in Prydz Bay,East Antarctica     

HAN Hongwei  CHENG Peng  LI Zhijun  LEI Ruibo  LU Peng 《极地研究(英文版)》2014,(1):10-16

The thermodynamic properties of snow cover on sea ice play a key role in the ice-ocean-atmosphere system and have been a focus of recent scientific research. In this study, we investigated the thermodynamic properties of snow cover on sea ice in the Nella Fjord, Prydz Bay, East Antarctica(69°20′S, 76°07′E), near the Chinese Antarctic Zhongshan Station. Our observations were carried out during the 29th Chinese National Antarctic Research Expedition. We found that the vertical temperature profile of snow cover changed considerably in response to changes in air temperature and solar radiation during the summer. Associated with the changes in the temperature profile were fluctuations in the temperature gradient within the upper 10 cm of the snow cover. Results of previous research have shown that the thermal conductivity of snow is strongly correlated with snow density. To calculate the thermal conductivity in this study, we measured densities in three snow pits. The calculated thermal conductivity ranged from 0.258–0.569 W?m-1?K-1. We present these datasets to show how involved parameters changed, and to contribute to a better understanding of melting processes in the snow cover on sea ice.  相似文献   

Spatial heterogeneity of soil mineral oxide components in depression between karst hills,Southwest China   总被引：3，自引：0，他引：3  

Hu Du  Kelin Wang  Wanxia Peng  Fuping Zeng  Tongqing Song  Hao Zhang  Shiyang Lu 《中国地理科学(英文版)》2014,24(2):163-179

In karst regions,the spatial heterogeneity of soil mineral oxides and environmental variables is still not clear.We investigated the spatial heterogeneity of SiO2,Al2O3,Fe2O3,CaO,MgO,P2O5,K2O,and MnO contents in the soils of slope land,plantation forest,secondary forest,and primary forest,as well as their relationships with environmental variables in a karst region of Southwest China.Geostatistics,principal component analysis(PCA),and canonical correlation analysis(CCA)were applied to analyze the field data.The results show that SiO2was the predominant mineral in the soils(45.02%–67.33%),followed by Al2O3and Fe2O3.Most soil mineral oxide components had a strong spatial dependence,except for CaO,MgO,and P2O5in the plantation forest,MgO and P2O5in the secondary forest,and CaO in the slope land.Dimensionality reduction in PCA was not appropriate due to the strong spatial heterogeneity in the ecosystems.Soil mineral oxide components,the main factors in all ecosystems,had greater influences on vegetation than those of conventional soil properties.There were close relationships between soil mineral oxide components and vegetation,topography,and conventional soil properties.Mineral oxide components affected species diversity,organic matter and nitrogen levels.  相似文献   

一种基于Storm编程模型的迭代Topology方案     

杜政颉  王鹏黄焱  郎福通 《成都信息工程学院学报》2014,(1):47-51

为解决Storm编程模型无法处理具有迭代结构的应用程序的问题,从迭代结构程序的特点出发,在Storm编程模型的基础上通过增加Receiver、IBolt、Checker组件组建迭代Topology,设计了一种可以处理迭代结构的编程模型,分析了这种模型实现原理,对这种模型的新增组件和其对应的应用程序接口进行介绍和分析,同时,在Storm系统架构基础上设计了一种迭代Topology的实现方案,描述了这种实现方式下解决具有迭代结构程序的具体过程,最后使用这种模型模拟实现K-Means算法,实例论证这种迭代模型的可行性。  相似文献   

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陈鹏  陈家君 《大地测量与地球动力学》2014,34(2):105-110

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田英国  郝金明  刘伟平  于合理  王鸿  杨剑伟 《大地测量与地球动力学》2014,34(1):157-160

???????GNSS??????????????????????????????????????????????α?????????????????????????????????ò????????????????????????????????????????????????Ч???????α????????????????????????????з??????????????ù?????????????? ??I_i-1????I_i?????????????в?????????????????????????????÷???????Ч???  相似文献   

GPU accelerated marine data visualization method   总被引：1，自引：0，他引：1  

Bo Li  Ge Chen  Fenglin Tian  Baomin Shao  Pengbo Ji 《中国海洋大学学报(英文版)》2014,13(6):964-970

The study of marine data visualization is of great value. Marine data, due to its large scale, random variation and multiresolution in nature, are hard to be visualized and analyzed. Nowadays, constructing an ocean model and visualizing model results have become some of the most important research topics of ‘Digital Ocean'. In this paper, a spherical ray casting method is developed to improve the traditional ray-casting algorithm and to make efficient use of GPUs. Aiming at the ocean current data, a 3D view-dependent line integral convolution method is used, in which the spatial frequency is adapted according to the distance from a camera. The study is based on a 3D virtual reality and visualization engine, namely the VV-Ocean. Some interactive operations are also provided to highlight the interesting structures and the characteristics of volumetric data. Finally, the marine data gathered in the East China Sea are displayed and analyzed. The results show that the method meets the requirements of real-time and interactive rendering.  相似文献   

Phylogenetic analysis of epibacterial communities on the surfaces of four red macroalgae   总被引：1，自引：0，他引：1  

Hongqing Wu  Min Liu  Wuchang Zhang  Tian Xiao 《中国海洋大学学报(英文版)》2014,13(6):1025-1032

Macroalgal surfaces are prone to being attached by bacteria. Epibacterial community structures on marine macroalgae are host-specific but temporally and spatially variable. In this study, we investigated the structure of epibacterial communities on the surfaces of four red macroalgae, Gracilaria lemaneiformis, Gloiopeltis furcata, Mazzaella sp. and Porphyra yezoensis, by analyzing the sequences of 16 S r RNA gene libraries. Healthy individuals of all macroalgae species were collected in winter from a farm at Dalian, China. The results showed that the epibacterial communities were mainly dominated by α-Proteobacteria, γ-Proteobacteria and Bacteroidetes. Deinococcus-Thermus, Spirochaetes and ε-Proteobacteria were also found. The majority of cloned sequences shared the greatest similarity to those of culturable organisms. A large portion of sequences from the α-Proteobacteria homed in Roseobacter clade, i.e., genera Ahrensia, Roseovarius, Litoreibacter, Octadecabacter, Thaiassobacter and Sulfitobacter, while members of Bacteroidetes mainly belonged to family Flavobacteriaceae. The cloned sequences could be separated into 66 OTUs at 0.01 distance value, and rare common OTUs were found among libraries. At genus level, Pseudoalteromonas dominated Gr. lemaneiformis and Gl. furcata libraries, accounting for 72.2% and 47.3%, respectively. Sulfitobacter dominated P. yezoensis library, accounting for 35.4%. A previously undefined cluster within Deinococcus-Thermus dominated Mazzaella sp. library, accounting for 24.6% of the all. These results indicated that a broad range of bacteria inhabited the surfaces of these macroalgae.  相似文献   

Extracting the subsonic anti-symmetric lamb wave from a submerged thin spherical shell backscattering through iterative time reversal     

Xiaotao Yu  Linhui Peng  Gaokun Yu 《中国海洋大学学报(英文版)》2014,13(4):589-596

The extraction of the weakly excited anti-symmetric Lamb wave from a submerged thin spherical shell backscattering is very difficult if the carrier frequency of the incident short tone burst is not at its frequency of greatest enhancement. Based on a single channel iterative time reversal technique, a method for isolating the subsonic anti-symmetric Lamb wave is proposed in this paper. The approach does not depend on the form function of a thin shell and any other priori knowledge, and it is also robust in the presence of some stochastic noise. Both theoretical and numerical results show that the subsonic anti-symmetric Lamb wave can be identified, even when the carrier frequency of the incident short tone burst is away from the frequency of greatest enhancement. The phenomenon may also be observed even in the case that the subsonic anti-symmetric Lamb wave is submerged in the noise, other than the case with the Signal to Noise Ratio being less than 10 dB, when the amplitude of the noise is comparable with the specular wave. In this paper, each iteration process contains a traditional transmission and time reversal transmission steps. The two steps can automatically compensate the time delay of the subsonic anti-symmetric Lamb wave relative to the specular wave and within-mode dispersion in the forward wave propagation.  相似文献   

基于空间综合分析的长株潭城市群结构评价与优化策略     

潘悦  韩瑞  庞添  冯婷 《地理信息世界》2022,29(1):17-22

长株潭城市群空间特征及优化策略可作为我国多中心城市群空间优化的典型样本之一.本文运用多维度空间分析方法,对长株潭城市群空间展开现状测度与评价,尊重城市群阶段特征,选取针对性指标对比反映空间内在特征.在采用核密度法分析2013年和2017年湖南省152个区县第二产业与就业指标的空间变化后,得出长株潭城市群已初步形成空间—...  相似文献