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Sedimentary system characteristics and depositional filling model of Upper Permian——Lower Triassic in South Yellow sea Basin

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Journal of Central South University 2018年第12期25卷 2910-2928页

作者： YUAN Yong CHEN Jian-wen ZHANG Yin-g ZHANG Yu-xi LIANG Jie ZHANG Peng-hui Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology of Ministry of land and Resources Qingdao Institute of Marine Geology Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology Faculty of Earth Resources China University of Geosciences College of Oceanography Hohai University

In the South Yellow sea Basin,Mesozoic–Paleozoic marine strata are generally well developed with large thickness,and no substantial breakthroughs have been made in hydrocarbon *** research,it is believed that the Upper Permian–Lower Triassic can be regarded as a long-term base-level *** on drilling data,characteristics of the lithology–electric property combination cyclicity,and the special lithology,the long-term base-level cycle was divided into five medium-term base-level cycles(MC1–MC5).On this basis,the Permian–Triassic sedimentary systems and their filling model were analyzed in accordance with the change of base-level cycle and transition of sedimentary environment,as well as characteristics of the drilling sedimentary facies and seismic *** results show that there were six sedimentary systems(fluvial,delta,tidal flat,open platform,restricted platform,and continental shelf)developed in the Upper Permian–Lower Triassic,the sedimentary systems were distributed such that the water was deep in the northwest and shallow in the southeast,and there were two base-level cycle filling models(a relatively stable tidal flat facies and a rapidly transgressive continental shelf facies to stable platform facies)developed in the Upper Permian–Lower *** models can provide a basis for evaluation of the Mesozoic–Paleozoic hydrocarbon geology in the South Yellow sea Basin.

关键词： sequence base-level cycle sedimentary system depositional filling model Upper Permian–Lower Triassic South Yellow sea Basin

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Smart Dragon 3 Launch Vehicle System

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Aerospace China 2022年第4期23卷 3-10页

作者： ZHANG Wen LIU Jiajia LIU Wei JIN Xin Beijing institute of Astronautical systems Engineering Beijing 1000762 China Academy of Launch Vehicle Technology Beijing 100076

The Smart Dragon 3 launch vehicle is a commercial carrier rocket based on the experience with the existing solid-fuel rocket Long March I I to meet the growing market demand in China for launching commercial satelites to low and medium *** carrier rocket has the characteristics of integral rocket storage,usable for both sea-and land-based launches,rapid response and *** is a solid carrier rocket with the largest lift capacity and the largest fairing envelope successfully flown *** paper introduces the main technical index and overall scheme of the *** also introduces the main dificulties encountered in the development of the rocket focusing on the aspects of the thermal emission at sea,the"Big hood"configuration and low commercial cost,as well as the interfaces with *** is expected to provide a better commercial launch service for users through technological and economic integration.

关键词： Smart Dragon 3 scheme dificulties satellite interface lift capacity

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Pedotransfer functions for predicting bulk density of coastal soils in East China

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Pedosphere 2023年第6期33卷 849-856页

作者： Guanghui ZHENG Caixia JIAO Xianli XIE Xuefeng CUI Gang SHANG Chengyi ZHAO Rong ZENG School of Geographic Sciences Nanjing University of Information Science&TechnologyNanjing 210044China Meteorology and Climate Centre School of Mathematics and StatisticsUniversity College DublinBelfieldDublin 4Ireland institute of Soil Science Chinese Academy of ScienceNanjing 210008China School of systems Science Beijing Normal UniversityBeijing 100875China

Soil bulk density(BD) is an important physical property and an essential factor for weight-to-volume conversion. However, BD is often missing from soil databases because its direct measurement is labor-intensive, time-consuming, and sometimes impractical, particularly on a large scale. Therefore, pedotransfer functions(PTFs) have been developed over several decades to predict BD. Here, six previously revised PTFs(including five basic functions and stepwise multiple linear regression(SMLR)) and two new PTFs, partial least squares regression(PLSR) and support vector machine regression(SVMR), were used to develop BD-predicting PTFs for coastal soils in East China. Predictor variables included soil organic carbon(SOC) and particle size distribution(PSD). To compare the robustness and reliability of the PTFs used, the calibration and prediction processes were performed 1 000 times using the calibration and validation sets divided by a random sampling algorithm. The results showed that SOC was the most important predictor, and the revised PTFs performed reasonably although only SOC was included. The PSD data were useful for a better prediction of BD, and sand and clay fractions were the second and third most important properties for predicting BD. Compared to the other PTFs, the PLSR was shown to be slightly better for the study area(the average adjusted coefficient of determination for prediction was 0.581). These results suggest that PLSR with SOC and PSD data can be used to fill in the missing BD data in coastal soil databases and provide important information to estimate coastal carbon storage, which will further improve our understanding of sea-land interactions under the conditions of ongoing global warming.

关键词： partial least squares regression particle size distribution soil organic carbon stepwise multiple linear regression support vector machine regression

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Infrasound Signals in Coastal Environment at Jang Bogo Station, Terra Nova Bay, Antarctica

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International Journal of Geosciences 2022年第12期13卷 1103-1114页

作者： Masaki Kanao Takahiko Murayama Yongcheol Park Research Organization of Information and systems National Institute of Polar Research Tokyo Japan Japan Weather Association Tokyo Japan Korea Polar Research institute Incheon Republic of Korea

Infrasound signals in Antarctica reflect physical interaction in the surface environments around the recorded area. In December 2015, an infrasound array by three sensors in the detectable frequency range of 0.1 - 200 Hz, combined with one broadband barometer was deployed at Jang Bogo Station, Terra Nova Bay, Antarctica. The two years of data by the broadband barometer contain characteristic signals that caused by surface environment nearby the station, mixing with local noises such as katabatic winds. Clear continuous signals by oceanic swells (microbaroms) were recorded with a predominant frequency of around 0.2 s. Variations of frequency context and amplitudes in the Power Spectral Density were considered as affected by sea-ice dynamics surrounding the Terra Nova Bay. Monitoring of microbaroms could contribute to understanding ocean wave climate, with other oceanographic, cryospheric and geophysical data in Antarctica. Infrasound data in Terra Nova Bay might be a new proxy for estimating environmental variations affected by global warming, cryosphere dynamics, together with volcanic eruptions in Victoria land.

关键词： Infrasound Signals Antarctica Terra Nova Bay Microbaroms Surface Environment

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Stable isotopes of summer monsoonal precipitation in southern China and the moisture sources evidence from δ^18O signature

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Journal of Geographical Sciences 2008年第2期18卷 155-165页

作者： LIU Jianrong SONG Xianfang YUAN Guofu SUN Xiaomin LIU Xin WANG Zhimin WANG Shiqin Key Laboratory of Water Cycle and Related land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100039 China CERN Sub-center of Water Beijing 100101 China

Summer monsoons （South Asian monsoon, South China sea monsoon and Subtropical monsoon） are prominent features of summertime climate over southern China. Dif- ferent monsoons carry different inflow moisture into China and control the temporal and spatial distributions of precipitation. Analyses of meteorological data, particularly wind, tempera- ture and pressure anomalies are traditional methods of characterizing moisture sources and transport patterns. Here, we try to utilize the evidence from stable isotopes signatures to trace summer monsoons over southern China. Based on seven CHNIP （Chinese Network of Iso- topes in Precipitation） observatory stations located in southern China, monthly composite precipitation samples have been collected and analyzed for the composition of δ^18O during July, 2005. The results indicated that the spatial distributions of δ^18O in precipitation could properly portray the moisture sources together with their transport pathways. Moreover, the amount effect, altitude effect, temperature effect and the correlation between δ^18O vs. relative humidity were discussed.

关键词： summer monsoon precipitation δ^18O vapor inflow corridors southern China

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An Overview of Tropical Cyclone and Tropical Meteorology Research Progress

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Advances in Atmospheric Sciences 2004年第3期21卷 505-514页

作者：陈联寿罗会邦端义宏余辉 Chinese Academy of Meteorological Sciences Beijing 100081 Sun Yat-Sen University Guangzhou 510275 Shanghai Typhoon institute Shanghai 200030 Shanghai Typhoon institute Shanghai 200030here has been much progress in the study of tropical cyclones and tropical meteorology in China in the past few years. A new atmospheric field experiment of tropical cyclone landfall with the acronym of CLATEX (China Landfalling Typhoon Experiment) was implemented in July-August 2002. The boundary layer characteristics of the target typhoon Vongfong and the mesoscale structural features of other land-falling typhoons were studied. In addition typhoon track operational forecasting errors in the last decade have been reduced because the operational monitoring equipment and forecast techniques were improved. Some results from the research program on tropical cvclone landfall structure and intensity change inten-sification near coastal waters interaction between tropical cyclone and mid-latitude circulation and the interaction among different scales of motion are described in this paper. Four major meteorological scien-tific experiments in China with international cooperation were implemented in 1998: the South China Sea monsoon field experiment (SCSMEX) the Tibetan Plateau field experiment (TIPEX) the Huaihe River basin energy and water cycle experiment (HUBEX) and the South China heavy rain scientific experiment (HUAMEX). Although these field experiments have different scientific objectives they commonly relate to monsoon activities and they interact with each other. The valuable intensive observation data that were obtained have already been shared internationally. Some new findings have been published recently. Other research work in China such as the tropical air-sea interaction tropical atmospheric circulation and weather systems are reviewed in this paper as well. Some research results have shown that the rainfall anomalies for different regions in China were closely related to the stages of El Nino events.

There has been much progress in the study of tropical cyclones and tropical meteorology in China in the past few years. A new atmospheric field experiment of tropical cyclone landfall with the acronym of CLATEX (China landfalling Typhoon Experiment) was implemented in July-August 2002. The boundary layer characteristics of the target typhoon Vongfong and the mesoscale structural features of other land-falling typhoons were studied. In addition, typhoon track operational forecasting errors in the last decade have been reduced because the operational monitoring equipment and forecast techniques were improved. Some results from the research program on tropical cvclone landfall, structure and intensity change, inten-sification near coastal waters, interaction between tropical cyclone and mid-latitude circulation, and the interaction among different scales of motion are described in this paper. Four major meteorological scien-tific experiments in China with international cooperation were implemented in 1998: the South China sea monsoon field experiment (SCSMEX), the Tibetan Plateau field experiment (TIPEX), the Huaihe River basin energy and water cycle experiment (HUBEX), and the South China heavy rain scientific experiment (HUAMEX). Although these field experiments have different scientific objectives, they commonly relate to monsoon activities and they interact with each other. The valuable intensive observation data that were obtained have already been shared internationally. Some new findings have been published recently. Other research work in China, such as the tropical air-sea interaction, tropical atmospheric circulation, and weather systems, are reviewed in this paper as well. Some research results have shown that the rainfall anomalies for different regions in China were closely related to the stages of El Nino events.

关键词： tropical cyclones tropical meteorology research progress

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Migration departure strategies of shorebirds at a final pre-breeding stopover site

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Avian Research 2018年第3期9卷 188-197页

作者： Kun Tan Chi-Yeung Choi Hebo Peng David S.Melville Zhijun Ma Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering Institute of Biodiversity ScienceFudan UniversityShanghai 200433China Centre for Integrative Ecology Deakin UniversityGeelongVICAustralia NIOZ Royal Netherlands institute for sea Research Department of Coastal Systems and Utrecht UniversityP.O.Box 591790 AB Den BurgTexelThe Netherlands Global Flyway Ecology Conservation Ecology GroupGroningen Institute for Evolutionary Life Sciences(GELIFES)University of GroningenP.O.Box 111039799 CC GroningenThe Netherlands Nelson New Zealand

Background: Departure decisions and behaviors of migratory birds at stopover sites are expected to maximize fit?ness by trade?offs among avoiding predators, optimizing refueling(energy) capacity, and matching other life?history events. We predict that species with different body sizes and migratory destinations will exhibit different behaviors when departing from the same stopover site. We also predict that with strong time constraint at the final pre?breed?ing stopover site, departure decisions may be less sensitive to exogenous factors, such as wind condition, compared to other stopover or nonbreeding ***: We recorded migratory departures of four shorebird species, i.e. Eurasian Curlew(Numenius arquata), Bar?tailed Godwit(Limosa lapponica), Great Knot(Calidris tenuirostris), and Grey Plover(Pluvialis squatarola), at Yaluji?ang Estuary Wetlands in China, a final pre?breeding stopover site in the northern Yellow sea, from 2011 to 2014. We compared flock sizes, departure time and departure directions between species, and investigated the effects of tide and weather conditions(rain and ground wind speed and direction) on the departure decision of ***: We found that larger species departed in smaller flocks and were more variable in daily departure time. Departure trajectory of all four species appeared to be influenced by coastal topography. With the east–west coast?line and intertidal mudflat on the south, birds exhibited westward or eastward deflection from the shortest migra?tory routes. Bar?tailed Godwit was the only species that deviated to the southeast and did not climb over the land. Birds avoided departure during precipitation, while their departure was not related to ground wind benefit or tidal ***: Body size among species, which influences their vulnerability to predators, might be important in shaping shorebird departure strategies. Diverse departure directions could be the result of different wind use tac?tics i

关键词： Migration Departure decision Departure behavior Shorebird Stopover Wader East Asian-Australasian Flyway

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Winter Meso-Scale Shear Front in the Yellow sea and Its Sedimentary Effects

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Journal of Ocean University of China 2016年第1期15卷 50-56页

作者： GAO Fei QIAO Lulu LI Guangxue College of Marine Geosciences Ocean University of China Qingdao 266100 P. R. China Qingdao institute of Marine Geology China Geological Survey Qingdao 266071 P. R. China Key Laboratory of Submarine Geoscience and Prospecti of Ministry of Education Qingdao 266100 P. R. China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and ResourcesQingdao 266071 P. R. China

In this paper,the authors explored the presence of shear fronts between the Yellow sea Coastal Current(YSCC) and the monsoon-strengthened Yellow sea Warm Current(YSWC) in winter and their sedimentary effects within the shear zone based on a fully validated numerical *** work added the wind force to a tidal model during simulating the winter baroclinic circulation in the Yellow *** results indicate that the YSWC is significantly strengthened by wind-driven compensation due to a northeast monsoon during winter *** this warm current encounters the North Shandong-South Yellow sea coastal current,there is a strong reverse shear action between the two current systems,forming a reverse-S-shaped shear front that begins near 34?N in the south and extends to approximately 38?N,with an overall length of over 600 *** main driving force for the formation of this shear front derives from the circulation system with the reverse *** the shear zone,temperature and salinity gradients increase,flow velocities are relatively small and the flow direction on one side of the shear zone is opposite to that on the other *** vertical circulation structure is complicated,consisting of a series of meso-and small-scale anti-clockwise ***,this shear effect significantly hinders the horizontal exchange of coastal sediments carried by warm currents,resulting in fine sediments deposition due to the weak hydrodynamic regime.

关键词： the Yellow sea shear front numerical simulation sedimentary effect

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Research and compilation of the Geomorphologic Atlas of the People＇s Republic of China （1：1,000,000）

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Journal of Geographical Sciences 2011年第1期21卷 89-100页

作者： CHENG Weiming ZHOU Chenghu CHAI Huixia ZHAO Shangmin LIU Haijiang ZHOU Zengpo institute of Geographic Sciences and Natural Resources Research CAS State Key Laboratory of Resources and Environmental Information Systems Beijing 100101 China Xinjiang institute of Ecology and Geography CAS Urumqi 830011 China China National Environmental Monitoring Center Beijing 100012 China

Geomorphologic maps are one of the most fundamental materials of the natural environment. They have been widely used in scientific research,resource exploration and extraction,education and military affairs etc. An editorial committee was established in 2001 to collect materials for researching and compiling a set of new 1：1,000,000 geomorphologic atlas of China. A digital geomorphologic database was created with visual interpretation from landsat TM/ETM imageries and SRTM-DEM etc. The atlas compiled from the database was finished. The main characteristics of the atlas are as follows：Firstly,landsat TM/ETM imageries,published geomorphologic maps or sketches,geographical base maps,digital geological maps,and other thematic maps were collected,which were uniformly geometrically rectified,clipped into uniform sheets,and stored in the foundation database. Secondly,based on the legends of 15 sheets 1：1,000,000 maps published in the 1980s,a geomorphologic classification system was built by combining morphology and genesis types. The system comprised seven hierarchical layers：basic morphology,genesis,sub-genesis,morphology,micro-morphology,slope and aspect,material composition and lithology. These layers were stored in the database during visual image interpretation. About 2000 kinds of morpho-genesis and 300 kinds of morpho-structure were interpreted. Thirdly,the legend system was built,which included color,symbol bases and note bases etc.,compilation standards and procedures were developed,74 sheets of 1：1,000,000 covering all land and sea territories of China were compiled,the 1：1,000,000 geomorphologic atlas of the People＇s Republic of China was finished and published. The atlas will fill the blanks in national basic scale thematic maps,and the geomorphologic database could be applied widely in many fields in the future.

关键词： digital geomorphology geomorphologic map 1:1,000,000 geomorphologic database

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Recent Advances in Monsoon Studies in China

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Advances in Atmospheric Sciences 2015年第2期32卷 206-229页

作者： XUE Feng ZENG Qingcun HUANG Ronghui LI Chongyin LU Riyu ZHOU Tianjun institute of Atmospheric Physics Chinese Academy of Sciences

This review provides a synopsis of the major progress that has been made in monsoon studies in China and to further bridge the gap between the Chinese and international meteorological community. It consists of seven major sections. After the introduction, the second section begins with the global monsoon systems and their seasonal variation, based on some new methods proposed in recent years. Besides, some major intraseasonal features of East Asian monsoon, including the onset of South China sea summer monsoon are discussed. In the third section, we review the interactions between ENSO and the East Asian monsoon, focusing in particular on the results of Chinese meteorologists that indicate the influence of ENSO on the East Asian summer monsoon（EASM） is obviously different from that on the tropical monsoon. Besides the tropical Pacific,other ocean basins, such as the Indian Ocean and the Atlantic Ocean, are also important to the East Asian monsoon, and this topic is discussed in the fourth section. In the fifth section, we address the role of land surface processes in East Asian monsoon. For example, we describe work that has shown more snow cover in spring on the Tibetan Plateau is followed by a weakened EASM and more summer rainfall in the Yangtze River valleys. The sixth section focuses on the influence of atmospheric circulation in the Southern Hemisphere（SH） on EASM, demonstrating how the signal from the SH is likely to provide new clues for the seasonal forecasting of summer rainfall in China. Finally, in the seventh section, we concentrate on the interdecadal variations of EASM. In particular, we look at a significant interdecadal variation that occurred at the end of the 1970 s, and how our understanding of this feature could affect forecasting ability.

关键词： East Asian monsoon global monsoon system ENSO interannual variability interdecadal variability

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