Vertical motions of tide gauge stations near the Bohai Sea and Yellow Sea     

ShouHua Liu  ChangLin Chen  KeXiu Liu  Lin Mu  Hui Wang  XinRong Wu  JianLi Zhang  XiaoFeng Duan  Jia Gao 《中国科学:地球科学(英文版)》2015,58(12):2279-2288

A modified Gauss-Markov model with weighted constraints was constructed by combining satellite altimeter and tide gauge records. Vertical motion rates of nine tide gauge stations around the Bohai Sea and Yellow Sea are estimated. This is the first time systematic estimates have been derived in this region. Downward trends were seen at the six tide gauge stations located at Tanggu, Longkou, Laohutan, Bayuquan, Xiaochangshan, and Yantai; with vertical motion rates of-1.82±0.50,-1.65±0.46,-0.88±0.42,-0.58±0.62,-0.13±0.43, and-0.01±0.43 mm/yr, respectively. Upward trends were seen at the three tide gauge stations located at Qinhuangdao, Huludao and Chengshantou; with vertical motion rates of 1.12±0.46, 0.55±0.49 and 0.26±0.44 mm/yr, respectively. There was significant subsidence in Tanggu and Longkou, and a rising trend in Qinhuangdao. According to our results, the rate of sea level rise calculated from these tide gauge records can be improved using a more accurate measurement of the land elevation accounting for lifting or subsidence. The model derived can be used to estimate vertical motions of tide gauge stations, and can be widely applied to revise the benchmark levels of tide gauges.  相似文献   

Residues and Organic Contaminants in Agricultural Soils in Intensive Agricultural Areas of Spain: A Three Years Survey          下载免费PDF全文

Juan A. Padilla‐Sánchez  Roberto Romero‐González  Patricia Plaza‐Bolaños  Antonia Garrido Frenich  José L. Martínez Vidal 《洁净——土壤、空气、水》2015,43(5):746-753

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Different Effects of a By‐product From Olive Oil Extraction on S‐Metolachlor and Bentazone Soil Fate          下载免费PDF全文

Ana I. Cañero  Lucía Cox  Alegría Cabrera  Juan Cornejo 《洁净——土壤、空气、水》2015,43(6):948-957

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CoRoT 102931335: a candidate γ Dor in an eclipsing binary     

C. Damiani  C. Maceroni  D. Cardini  J. Debosscher  L. Balaguer-Núñez  I. Ribas 《Astrophysics and Space Science》2010,328(1-2):91-96

We present an on-going study of CoRoT 102931335. Our preliminary results indicate that the target is an eclipsing binary system with an orbital period of $3{.\!\!\vphantom{0}^{\mathrm{d}}}979$ and a primary component pulsating in the frequency range 0.6–0.8 c/d. The results of a ground-based follow-up program provided four-colour Strömgren photometry and allowed us to infer the spectral class and the primary effective temperature. We devised and applied an iterative procedure to disentangle the effects of binarity from those of pulsations and could test that a detailed binary modelling is essential for the purpose. Our results suggest that the pulsating component of CoRoT 102931335 could be a γ Dor variable, a rare occurrence in an eclipsing system.  相似文献   

乌鲁木齐市土地利用供应管理系统的设计实现与特点     

张忠生  穆荣  王新军  刘永君 《国土资源信息化》2012,(2):37-38

本文结合乌鲁木齐市土地利用供应管理业务需求和特点,对供地业务和系统进行了分析、设计,并基于ArcGIS Server 9.3平台,采用J2EE架构实现了系统的功能。系统实现了与国土资源部土地市场动态监测与监管系统、乌鲁木齐市已有的建设用地预审审批系统、城镇地籍管理系统的关联,打通了业务之间的"数据链路"。通过对供地业务流程的再造,采用集中打印工作模式的设计,提高了工作效率。  相似文献   

The Time and Regime Dependencies of Sensitive Areas for Tropical Cyclone Prediction Using the CNOP Method     

ZHOU Feifan  MU Mu 《大气科学进展》2012,29(4):705-716

This study examines the time and regime dependencies of sensitive areas identified by the conditional nonlinear optimal perturbation(CNOP) method for forecasts of two typhoons.Typhoon Meari(2004) was weakly nonlinear and is herein referred to as the linear case,while Typhoon Matsa(2005) was strongly nonlinear and is herein referred to as the nonlinear case.In the linear case,the sensitive areas identified for special forecast times when the initial time was fixed resembled those identified for other forecast times.Targeted observations deployed to improve a special time forecast would thus also benefit forecasts at other times.In the nonlinear case,the similarities among the sensitive areas identified for different forecast times were more limited.The deployment of targeted observations in the nonlinear case would therefore need to be adapted to achieve large improvements for different targeted forecasts.For both cases,the closer the forecast time,the higher the similarities of the sensitive areas.When the forecast time was fixed,the sensitive areas in the linear case diverged continuously from the verification area as the forecast period lengthened,while those in the nonlinear case were always located around the initial cyclones.The deployment of targeted observations to improve a special forecast depends strongly on the time of deployment.An examination of the efficiency gained by reducing initial errors within the identified sensitive areas confirmed these results.In general,the greatest improvement in a special time forecast was obtained by identifying the sensitive areas for the corresponding forecast time period.  相似文献   

Responses of soil carbon variation to climate variability in China using the LPJ model   总被引：1，自引：1，他引：0  

Guodong Sun  Mu Mu 《Theoretical and Applied Climatology》2012,110(1-2):143-153

In this study, we explored the maximal response of soil carbon in a part of China to climate change, including variations in climatology and climate variability, under the condition of global warming. A conditional nonlinear optimal perturbation (CNOP) approach was employed to discuss the above issue using the Lund–Potsdam–Jena (LPJ) model. The variation in the soil carbon was compared with those caused by a linear temperature or precipitation perturbation. The key difference between the CNOP-type and the linear perturbations depended on whether the perturbations brought the variation in the temperature or the precipitation variability in comparison with the reference temperature or the precipitation variability. The model results demonstrated that the variations in the soil carbon resulted from the CNOP-type and linear temperature perturbations in south of the study region, which was corresponding to part of South China, had different variations. We examined three components of the soil carbon in the LPJ model: fast-decomposing soil carbon, slow-decomposing soil carbon, and litter below the ground. The variations of these components derived by the two types of temperature perturbations were different in the chosen region. The reduction in the litter below the ground may be the main cause of decreased soil carbon in arid and semi-arid regions as a result of the two types of temperature perturbations. The different impacts of the two types of temperature perturbations in the south of the study region may be mainly caused by the variations in the fast-decomposing soil carbon. The variations in the soil carbon caused by the two types of precipitation perturbations were similar. In the arid and semi-arid regions, the soil carbon increased due to the two types of precipitation perturbations. This research implies that the variation in temperature variability plays a crucial role in the variations of the soil carbon and its components in the study region.  相似文献   

A new jadeitite jade locality (Sierra del Convento, Cuba): first report and some petrological and archeological implications   总被引：1，自引：1，他引：0  

Antonio García-Casco  A. Rodríguez Vega  J. Cárdenas Párraga  M. A. Iturralde-Vinent  C. Lázaro  I. Blanco Quintero  Y. Rojas Agramonte  A. Kröner  K. Núñez Cambra  G. Millán  R. L. Torres-Roldán  S. Carrasquilla 《Contributions to Mineralogy and Petrology》2009,158(1):1-16

A new jadeitite jade locality has been discovered in the serpentinite-matrix subduction mélange of the Sierra del Convento (eastern Cuba) in a context associated with tectonic blocks of garnet-epidote amphibolite, tonalitic–trondhjemitic epidote gneiss, and blueschist. The mineral assemblages of jadeitite jade and jadeite rocks are varied and include combinations of jadeite, omphacite, albite, paragonite, analcime, clinozoisite-epidote, apatite, phlogopite, phengite, chlorite, glaucophane, titanite, rutile, zircon, and quartz formed during various stages in their P–T evolution. Field relationships are obscure, but some samples made almost exclusively of jadeite show evidence of crystallization from fluid in veins. In one of these samples studied in detail jadeite shows complex textural and chemical characteristics (including oscillatory zoning) that denote growth in a changing chemical medium. It is proposed that interaction of an Al–Na rich fluid with ultramafic rocks produced Al–Na–Mg–Ca fluids of varying composition. Episodic infiltration of these fluids, as a result of episodic opening of the veins, developed oscillatory zoning by direct precipitation from fluid and after reaction of fluid with pre-existing jadeite. The latest infiltrating fluids were richer in Mg–Ca, favouring the formation of omphacite and Mg–Ca rich jadeite in open voids and the replacement of earlier jadeite by fine-grained omphacite + jadeite at 550–560°C. This new occurrence of jadeite in Cuba opens important perspectives for archeological studies of pre-Columbian jade artifacts in the Caribbean region.  相似文献   

CO<Subscript>2</Subscript> source-sink matching in the lower 48 United States,with examples from the Texas Gulf Coast and Permian Basin     

W. A. Ambrose  C. Breton  M. H. Holtz  V. Núñez-López  S. D. Hovorka  I. J. Duncan 《Environmental Geology》2009,57(7):1537-1551

Documenting geographic distribution and spatial linkages between CO₂ sources and potential sinks in areas with significant levels of CO₂ emissions is important when considering carbon-management strategies such as geologic sequestration or enhanced oil recovery (EOR). For example, the US Gulf Coast overlies a thick succession (>6,000 m [>20,000 ft]) of highly porous and permeable sandstone formations separated by thick, regionally extensive shale aquitards. The Gulf Coast and Permian Basin also have a large potential for EOR, in which CO₂ injected into suitable oil reservoirs could be followed by long-term storage of CO₂ in nonproductive formations below reservoir intervals. For example, >6 billion barrels (Bbbl) of oil from 182 large reservoirs is technically recoverable in the Permian Basin as a result of miscible-CO₂ flooding_. The Gulf Coast also contains an additional 4.5 Bbbl of oil that could be produced by using miscible CO₂. Although the CO₂ pipeline infrastructure is well-developed in the Permian Basin, east Texas and the Texas Gulf Coast may have a greater long-term potential for deep, permanent storage of CO₂ because of thick brine-bearing formations near both major subsurface and point sources of CO₂.  相似文献   

The impact of disposal and treatment of coal mining wastes on environment and farmland   总被引：9，自引：0，他引：9  

Zhengfu Bian  Jihong Dong  Shaogang Lei  Hailong Leng  Shouguo Mu  Hui Wang 《Environmental Geology》2009,58(3):625-634

In China, coal mining wastes have traditionally been dumped in cone-shaped heaps that have the potential to pollute air, soil and water environments and landscapes through dust generation, leachate production, self-ignition and as a consequence of an absence of vegetation cover. Since 1980s, the disposal technique for coal mining wastes has been changing and in many instances the wastes are now transported directly to subsided land as a fill to enable the reuse of that land. Thus, today, both coal mining waste dumps from the past and filled subsided lands are in existence. However, the comparative impacts of these different disposal techniques on the environment and farmland productivity have not been studied in detail. Using Dongtan (DT), Nantun (NT) and Xinglongzhuang (XLZ) coal mines as examples, the components of coal mining wastes and their potential pollution contribution to soil, surface water and ground water are tested in-situ. The results show that contaminants are released after self-ignition and weathering of coal mining wastes, but they are not above the allowable environmental standards. However, despite these findings, more and closer attention needs to be paid to the mobility, transportation and accumulation of these contaminants in the environment over time.  相似文献