科学计算程序库WHIGG F90 LIB及其地学应用

WHIGG F90LIB(WFL)是一款用FORTRAN90语言编写的用于地球学科的计算程序库。应用WFL可以减少重复性编程,方便地解决科学计算中数据的预处理问题,结合多种分析方法,对科学问题进行定量分析。利用WFL在地球重力场、气候涛动和数字信号处理3个方面的应用实例,以验证WFL在科学计算中应用的有效性。     

用GPS位移资料计算应变方法的讨论

目前使用相同或类似的GPS资料求应变,不同研究者给出的结果会有显著差别。为此,对用GPS位移(或速度)资料计算应变(或应变速率)的方法进行了研讨。分析后认为,应变计算可以归结成两大类第一类是利用测点附近资料直接求微分或微分的加权平均值的直接计算法;第二类是用解析曲线拟合观测的位移,然后根据该曲线提供的总的趋势求测点的微分值的位移拟合法,这类方法在拟合中又可以分成整体拟合和分片拟合两种。应变计算应该在球面坐标系下进行,根据研究对象和要求,选择适当的方法。     

安徽齐云山丹霞地貌成因

According to the study of some local scholars (Peng Hua et al., 2000), over 400 sites of Danxia landform have been already discovered in China. Chen Guoda (1935), Zeng Zhaoxuan et al. (1978), Huang Jin et al. (1992; 1994; 1996) and Peng Hua et al. (1998; …     

Observation on height changes of chinese tide gauges by GPS

IntroductionBecause of global temperature rising and glacierthawing,the sea level has risen about 10-25 cmin the past century[1]. The sea level change isone of the main ai ms in global change monito-ring. Presently the basic tool used in sea levelmonitori…     

山东北部全新世的人地关系演变: 以海岸变迁和海盐生产为例

根据先秦考古遗址地理分布的分析和郭井子贝壳堤的发掘和调查,复原了6.5~5.0kaB.P. ,4.5~4.0kaB.P.和3.4~2.1kaB.P.的3条海岸线,它们大致与现代海岸线平行分布,年代自南向北逐渐年轻,揭示了山东北部地区全新世海侵和海退过程的主要环节,恢复了全新世海岸变迁的具体历程。对寿光大荒北央遗址出土盔形器内壁凝结物的XRF和XRD分析证明,本区沿海商周时期遗址出土的盔形器应是制盐器具,而沿海盔形器密集分布区与6.5~5.0kaB.P.的海岸线基本重合,表明商周时期海盐生产地域应在6.5~5.0kaB.P.和3.4~2.1kaB.P.的两条海岸线之间。本区的海盐生产与海岸变迁密切相关,人类适应环境和开发资源的主要手段就是从事海盐生产。在6.5~4.0kaB.P. ,人类在滨海地带有了初步的海盐生产,开始了适应环境和利用自然资源的最早尝试,在3.4~2.1kaB.P. ,人类又开始开采地下卤水生产海盐,使现今海拔9~10m以下的广阔地区成为产盐区。本区内陆的山前平原地带则是海盐的主要消费区,也是产盐区所需粮食和各种生产生活用品的供应区。这一分析对研究本区先秦时期的聚落功能演变具有重要意义,也是研究本区全新世人地关系演变的关键视角。     

林甸M S 5.1地震前地震活动图像分析和综合预报方法

通过对黑龙江亚板块及其临近区域的不同时段地震活动图像研究分析,发现了中强震前地震活动图像的一些特点,再回归到地震动力学环境中去,建立了理论解释模型和两条判据假说。以此为基础并结合近年来地震活动图像综合分析后,我们在2005年下半年黑龙江省地震趋势会商意见中提出:松嫩盆地是5级以上中强震的主要孕震区。2005年7月25日林甸Ms 5．1地震对此给予了验证。本文对此过程阐述并作进一步分析,希望这种综合预报方法对地震预报工作有所帮助。     

基于能量原理的钢筋混凝土简体结构抗震性能研究

本文通过能量法研究了钢筋混凝土简体结构的抗震性能。文中采用振型分解法按等效单自由度体系求解简体结构的滞回输入能;用pushover法分析了滞回耗能在结构层间的分布规律及结构自身的耗能能力;根据楼层滞回耗能与弹塑性层间位移的关系求出了薄弱层的弹塑性位移。对一高层钢筋混凝土框架-简体结构在7度罕遇地震下的抗震性能进行了评估,通过与非线性动力时程分析的对比,证明了方法的可行性。     

The Structure of Potential Amur Tiger (Panthera tigris altaica) Habitats and Evaluation of Its Prey in Taipingou National Reserve (China) Based on Remote Sensing Data

Izvestiya, Atmospheric and Oceanic Physics - The population of the Amur tiger (Panthera tigris altaica) in the Russian Far East is currently being restored; young individuals are being spread...     

SMAP卫星海表盐度产品的检验与校正

In this study, sea surface salinity(SSS) Level 3(L3) daily product derived from soil moisture active passive(SMAP)during the year 2016, was validated and compared with SSS daily products derived from soil Moisture and ocean salinity(SMOS) and in-situ measurements. Generally, the root mean square error(RMSE) of the daily SSS products is larger along the coastal areas and at high latitudes and is smaller in the tropical regions and open oceans. Comparisons between the two types of daily satellite SSS product revealed that the RMSE was higher in the daily SMOS product than in the SMAP, whereas the bias of the daily SMOS was observed to be less than that of the SMAP when compared with Argo floats data. In addition, the latitude-dependent bias and RMSE of the SMAP SSS were found to be primarily influenced by the precipitation and the sea surface temperature(SST). Then, a regression analysis method which has adopted the precipitation and SST data was used to correct the larger bias of the daily SMAP product. It was confirmed that the corrected daily SMAP product could be used for assimilation in high-resolution forecast models, due to the fact that it was demonstrated to be unbiased and much closer to the in-situ measurements than the original uncorrected SMAP product.     

利用GPS拖体在万山区域测量平均海面技术研究

Wanshan area has been chosen to be the specified field to calibrate and validate(Cal/Val) the HY-2 altimeter and its follow-on satellites. In March 2018, an experiment has been conducted to determine the sea surface height(SSH) under the HY-2 A ground track(Pass No. 203). A GPS towing-body(GPS-TB) was designed to measure the SSH covering an area of about 6 km×28 km wide centered on the HY-2 A altimeter satellite ground track. Three GPS reference stations, one tide gauge and a GPS buoy were placed in the research area, in order to process and resolve the kinematic solution and check the precision of the GPS-TB respectively. All the GPS data were calculated by the GAMIT/GLOBK software and TRACK module. The sea surface was determined by the GPS-TB solution and the tide gauge placed on Zhiwan Island. Then the sea surface of this area was interpolated by Arc GIS10.2 with ordinary Kriging method. The results showed that the precision of the GPS-TB is about 1.10 cm compared with the tide gauge placed nearby, which has an equivalent precision with the GPS buoy. The interpolated sea surface has a bias of –1.5–4.0 cm with standard deviation of 0.2–2.4 cm compared with the checking line. The gradient of the measured sea surface is about 1.62 cm/km along the HY-2 orbit which shows a good agreement compared with the CLS11 mean sea surface(MSS). In the Cal/Val of satellites, the sea surface between the tide gauge/GPS buoy and the footprint of altimeter can be improved by this work.