Terrestrial, Atmospheric and Oceanic Sciences最新文献_第10页

Regional geoid for Nepal using Least-Squares Collocation 使用最小二乘搭配的尼泊尔区域大地水准面

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.08.23.02

Sushmita Timilsina, M. Willberg, R. Rol

引用次数: 1

Assessing the potential predictability of tropical cyclone activity in the Philippines on weekly timescales 评估菲律宾热带气旋活动在每周时间尺度上的潜在可预测性

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.08.23.03

M. Ii, Tzu‐Ting Lo, Hsiao-Chung Tsai, E. Cayanan

引用次数: 0

Impact of semi-annual ionospheric total electron content variation on station displacements using single-frequency PPP 利用单频PPP分析电离层总电子含量半年变化对台站位移的影响

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.08.31.01

T. Tseng, C. Shum, Y. Hsiao, C. Kuo, W. Yeh

{"title":"Impact of semi-annual ionospheric total electron content variation on station displacements using single-frequency PPP","authors":"T. Tseng, C. Shum, Y. Hsiao, C. Kuo, W. Yeh","doi":"10.3319/tao.2021.08.31.01","DOIUrl":"https://doi.org/10.3319/tao.2021.08.31.01","url":null,"abstract":"Global Positioning System (GPS) station displacements in this work are derived using the so-called precise point positioning (PPP) technique with low-cost singlefrequency (SF) receivers. In the SF PPP, the ionosphere delay is the largest error source if the satellite orbits and clocks are well modeled. We use two strategies to minimize the ionosphere delay for an internal comparison: (1) correction using the global ionosphere map (GIM), and (2) estimates of the ionospheric total electron content (TEC) from SF observables (SFO). The trends of the station displacements derived from these two strategies consistently present a systematic movement toward the southwest. Here the trend is referred to the slope of a linear function used to fit the displacement data. Such a systematic movement is mainly caused by the semi-annual variation of the ionospheric TEC rather than the seasonal geophysical effect and the high-order ionosphere effect, both of which only cause the station displacements ranging from a few mm to a few cm. We present a statistical analysis in terms of correlation coefficients between the semi-annual TEC variation and the station displacement. The maximum correlation coefficient is higher than 0.8 in the U component, followed by the E and N components. In addition, the impact of the semi-annual TEC variation on the station displacement is approximately 0.71, 0.45, and 0.92 m in the north (N), east (E), and height (U) for a region close to the latitude 23°N and longitude 121°E. This suggests that the semi-annual TEC variation should be considered in a time series of station displacements derived by the SF-PPP. Article history: Received 17 February 2021 Revised 12 July 2021 Accepted 31 August 2021","PeriodicalId":22259,"journal":{"name":"Terrestrial, Atmospheric and Oceanic Sciences","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69524146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relation of the western North Pacific tropical cyclone genesis number to intraseasonal oscillation intensity 北太平洋西部热带气旋成因数与季内振荡强度的关系

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.06.04.02

R. Wu, Xi Cao

{"title":"Relation of the western North Pacific tropical cyclone genesis number to intraseasonal oscillation intensity","authors":"R. Wu, Xi Cao","doi":"10.3319/tao.2021.06.04.02","DOIUrl":"https://doi.org/10.3319/tao.2021.06.04.02","url":null,"abstract":"The present study investigates the relationship of the year-to-year variations in the tropical cyclone (TC) genesis number over the western North Pacific (WNP) to the intensity of 10-20-day and 30-60-day intraseasonal oscillations (ISOs) during 1979 - 2018. It is found that the relationship between the TC genesis number and ISO intensity differs largely among the four quadrants of the WNP. The TC number in the southeast quadrant of the WNP has a close relation to the ISO intensity, but the relation is mostly weak for the TC number in the other three quadrants of the WNP. More (less) TC number in the southeast quadrant of the WNP corresponds to a stronger (weaker) ISOs. This indicates that stronger ISOs or longer active phases of the ISOs provide a favorable condition for formation of more TCs. This modulation of the ISO intensity on the TC genesis number suggests an indirect way for influence of seasonal mean background on the year-to-year variations in the WNP TC number through the ISO intensity. Further analysis suggests that this indirect way is likely a more important manner for the influence of seasonal mean background on the year-to-year variations in the genesis TC number over the WNP.","PeriodicalId":22259,"journal":{"name":"Terrestrial, Atmospheric and Oceanic Sciences","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69524247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

First record of Late Miocene Dendrophyllia de Blainville, 1830 (Scleractinia: Dendrophylliidae) in Taiwan 台湾晚中新世树突树属首次记录，1830年(核螨亚:树突树科)

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.09.13.02

L. Ribas-Deulofeu, Yen-Chun Wang, C. Lin

{"title":"First record of Late Miocene Dendrophyllia de Blainville, 1830 (Scleractinia: Dendrophylliidae) in Taiwan","authors":"L. Ribas-Deulofeu, Yen-Chun Wang, C. Lin","doi":"10.3319/tao.2021.09.13.02","DOIUrl":"https://doi.org/10.3319/tao.2021.09.13.02","url":null,"abstract":"The recently exposed outcrops along the Dahan River in Shulin, northern Taiwan revealed diverse and abundant marine fossils including molluscs, shark and ray teeth, sand dollars, and otoliths from a wide range of fish taxa. In addition, numerous small and fragile fossil scleractinians were found and identified here as Dendrophyl-lia sp., from the mainly azooxanthellate (90%) dendrophylliid family. Lithology of the outcrops are mainly composed of grey sandstones from the Tapu Formation (Late Miocene), overlying on a layer of basaltic tuff. The absolute age of the boundary be-tween the Tapu Formation and the underlying Nanchuang Formation is 8 Ma, which provides indications on the maximum age possible for the scleractinian fossils found in this study. Back then, the marine ecosystem in which the sampled Dendropyllia specimens grew was probably a turbid shallow coastal environment with muddy to sandy bottom, likely at the vicinity of a river estuary, as suggested by the combined presence of previously reported fish otoliths. To our knowledge, this is the first record of Dendrophyllia fossils from Taiwan.","PeriodicalId":22259,"journal":{"name":"Terrestrial, Atmospheric and Oceanic Sciences","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69524281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Spatial-temporal variations of Köppen climate types in China 中国Köppen气候类型的时空变化

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.10.18.01

Ting Wang, Daowei Zhou, Xiangjin Shen

{"title":"Spatial-temporal variations of Köppen climate types in China","authors":"Ting Wang, Daowei Zhou, Xiangjin Shen","doi":"10.3319/tao.2021.10.18.01","DOIUrl":"https://doi.org/10.3319/tao.2021.10.18.01","url":null,"abstract":"The classification of Köppen climate type has been widely used to identify regional climate change. This study investigated the changes of Köppen climate type over China during 1964 2015. On average, the arid climate was located in the northwest, tropical climate, temperate climate, and cold climate were distributed in the east from south to north along the latitude, and polar climate was concentrated on the Tibetan Plateau. Comparing Köppen climate types during 1964 1989 and 1990 2015, we found that cold climate with dry winter was replaced by a cold steppe climate in Northeast China and North China, warm summer was replaced by cold summer in Northeast China and the Tibetan Plateau, tundra climate was substituted by cold climate in the Tibetan Plateau, and cold climate was replaced by temperate climate in Central China and East China. Our results showed that the arid climate expanded eastward and southward, which may have resulted from a decrease in precipitation. Owing to the increase in temperature, the climate zones moved northward. This study provides valuable insights for government decision-makers in formulating crop planting systems, water resource management, and land use planning. Article history: Received 21 June 2021 Revised 15 September 2021 Accepted 18 October 2021","PeriodicalId":22259,"journal":{"name":"Terrestrial, Atmospheric and Oceanic Sciences","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69524470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

VHF scintillations and plasma drifts observed in southern Taiwan during the declining phase of solar cycle 24 台湾南部在太阳第24周期衰退期观测到的甚高频闪烁和等离子体漂移

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.09.16.02

Ya-Chih Mao, Cissi Y. Lin

引用次数: 0

A statistical study of the monsoon trough and associated tropical cyclogenesis over the western North Pacific 北太平洋西部季风槽及相关热带气旋形成的统计研究

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.12.15.02

T. Feng, Tao Zheng

引用次数: 0

Water of eastern Taiwan mud volcanoes. Part I. H, triple O, triple Sr isotopes, and trace elements of Lo-Shan mud volcano 台湾东部泥火山水。第一部分:罗山泥火山H、三O、三Sr同位素及微量元素

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.12.26.01

H. Chao, C. You, I. Lin, Hsueh-Yu Lu, Hou-Chun Liu, C. Chung

{"title":"Water of eastern Taiwan mud volcanoes. Part I. H, triple O, triple Sr isotopes, and trace elements of Lo-Shan mud volcano","authors":"H. Chao, C. You, I. Lin, Hsueh-Yu Lu, Hou-Chun Liu, C. Chung","doi":"10.3319/tao.2021.12.26.01","DOIUrl":"https://doi.org/10.3319/tao.2021.12.26.01","url":null,"abstract":"Mud volcano (MV) is one of the most important passageways for deep seated volatile materials to migrate back to Earth’s surface in sedimentary basins and subduction zones. Waters of MV fluid emitted from 18 mud pools in MV Luo-Shan (LS) in eastern Taiwan were sampled from the year 2002 to the year 2021. Major and trace components as well as H, triple O (δ18O and Δ17O) and triple Sr isotopes (87Sr/86Sr and δ88Sr) were measured. The results show that major components of water are Cl-, Na and Ca. Compared with seawater, water of MV LS reveals similar chemical characteristics with low-temperature ridge-flank hydrothermal spring and marine pore water in reducing condition. Limited spatial and temporal variation of major components as well as H, triple O and 87Sr/86Sr indicates waters emitted by mud pools come from the same source regionally. Slightly radiogenic 87Sr/86Sr at southern mud pools and before the year 2003 denotes different fluid reservoir from northern ones. Small 87Sr/86Sr variation in waters of northern mud pools indicates near surface mixing from 2 fluid reservoirs. The correlation among all components reveals sediment component addition is the major factor and evaporation is the key factor for conservative elements. In summary, waters expelled by MV LS mud pools originate from the same regional source, and their trace element composition such as Mg, K, Sr as well as 87Sr/86Sr slightly varies, depending on the location of the reservoir they are <Ac cept ed M anu scrip t> hosted. A stable source with small vibration of fluid reservoir of MV LS is indicated during the 19-years investigation period.","PeriodicalId":22259,"journal":{"name":"Terrestrial, Atmospheric and Oceanic Sciences","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69525142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Introduction to the special issue on Gravity and geoid in the Asia Pacific 《亚太地区重力与大地水准面》特刊简介

IF 0.8 4区地球科学

Terrestrial, Atmospheric and Oceanic Sciences Pub Date : 2021-01-01 DOI: 10.3319/tao.2021.12.30.01

C. Hwang, W. Shen, Xiaopeng Li, Ami Hassan Md Din

引用次数: 0