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首页> 外文期刊>Allgemeine Vermessungs-Nachrichten >Observing Ocean Mass Variability with Spring Gravimeters - Storm Surge Induced Signals on the North Sea Island Helgoland
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Observing Ocean Mass Variability with Spring Gravimeters - Storm Surge Induced Signals on the North Sea Island Helgoland

机译：春季重力观察海洋大规模变异 - 北海岛北海岛上的风暴浪涌诱导信号

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摘要

Climate change is broadly discussed due to water level rise almost worldwide. Additionally, ocean-related risks driven by atmospheric dynamics are amplified, as tidal amplitudes in coastal areas and storm surges, which threaten coastal areas and the unique Wadden Sea in the German Bight. Investigations of the oceans in general and of the North Sea particularly are done by satellite technics as altimetry and the satellite mission GRACE-FO. Terrestrial geodetic measurements are needed for corrections and validation of the results. Several methods are in use in order to measure water level variations (tide gauges) and load related deformation (GNSS). Our key question is: Are accurate continuous gravimetric observations sensitive to non-tidal oceanic loading of the sea floor? For the first time, three spring-type gravimeters were installed on the island Helgoland in the North Sea, predominantly in winter season, to observe surrounding maximal water mass variations during the winter period 2018/2019. In spite of the non-linear instrumental drift, gravity variations exceeding 100 nm/s~2* over periods of 1 -3 days could significantly be separated. Partly they are assigned to water level variations due to storm events, e. g. Zeetje (1.1.2019) and Benjamin (8.1.2019), and wind directions, accordingly. A rough modelling of the estimated corresponding water mass load with maximum water level rise of 2 m in the German Bight agree with the observed attraction effects and with the vertical displacement observed in gravity and by GNSS. We conclude that we succeeded on the island Helgoland to measure gravimetrically the non-tidal mass variations and the related crustal deformation in the North Sea. It should be further continued during winter seasons. Even more appropriate may be the installation of an iGrav superconducting gravimeter benefitting from its small, linear instrumental drift. Finally, this research will contribute to tidal and non-tidal ocean mass variability models and will support the monthly modelling of the geopotential field from the satellite mission GRACE-FO, where the so-called de-aliasing products for short-term variations in atmosphere and ocean are needed.
机译：由于水位上升几乎全球，气候变化大致讨论。此外，由大气动态驱动的海洋有关的风险被扩增，作为沿海地区和风暴潮的潮汐幅度，威胁沿海地区和德国最近的瓦登海。通常由卫星技术和北海的海洋调查，作为高度测量和卫星使命恩典 - 佛罗里达州的卫星技术。校正和验证结果需要陆地大地测量。有几种方法可以使用，以测量水位变化（潮汐仪）和载荷相关变形（GNSS）。我们的关键问题是：准确的连续重量观测对海底的非潮汐海洋装载敏感？这是第一次，三种弹簧型重力安装在北海的岛屿螺旋兰，主要是在冬季，观察2018/2019年冬季的周围最大水质变化。尽管有非线性仪器漂移，但在1-3天内超过100nm / s〜2 *的重力变化可以显着分离。部分原因是由于风暴事件而分配给水位变化，即G。 Zeetje（1.1.2019）和本杰明（8.1.2019）和风向相应地。熟悉的相应水质量负荷造型的粗略建模，德国最大水平升高为2米，同意观察到的吸引力，并且在重力和GNSS中观察到垂直位移。我们得出结论，我们成功地在岛赫尔戈尔兰岛上测量了重量体的非潮汐质量变化和北海的相关地壳变形。在冬季，它应该进一步继续。更合适的可能是IGRAV超导重量计的安装受益于其小线性仪器漂移。最后，该研究将有助于潮汐和非潮汐海洋群众变异型号，并将支持卫星使命Grace-Fo的地球势领域的月度建模，其中所谓的脱叠产品在大气中的短期变化和海洋是需要的。

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  • 来源
    《Allgemeine Vermessungs-Nachrichten》 |2020年第4期|163-173|共11页
  • 作者

    Adelheid Weise; Ludger Timmen; Zhiguo Deng; Gerald Gabriel; Christian Rothleitner; Manuel Schilling; Christian Voigt;

  • 作者单位

    LEIBNIZ UNIVERSITAET HANNOVER INSTITUT FUER ERDMESSUNG Schneiderberg 50 ∣ 30167 Hannover;

    LEIBNIZ UNIVERSITAET HANNOVER INSTITUT FUER ERDMESSUNG Schneiderberg 50 ∣ 30167 Hannover;

    HELMHOLTZ-ZENTRUM POTSDAM -DEUTSCHES GEOFORSCHUNGSZENTRUM GFZ - SPACE GEODETIC TECHNIQUES Telegrafenberg Gebäude A17 ∣14473 Potsdam;

    LEIBNIZ-INSTITUT FUER ANGEWANDTE GEOPHYSIK (LIAG) - SEKTION S1 SEISMIK & POTENZIALVERFAHREN LEIBNIZ UNIVERSITAET HANNOVER INSTITUT FUER GEOLOGIE Stilleweg 2 ∣ 30655 Hannover;

    PHYSIKALISCH-TECHNISCHE BUNDESANSTALT (PTB)-DEPARTMENT 1.1-MASS-DISSEMINATION OF THE UNIT Bundesallee 100 ∣ 38116 Braunschweig;

    LEIBNIZ UNIVERSITAET HANNOVER -INSTITUT FUER ERDMESSUNG Schneiderberg 50 ∣ 30167 Hannover;

    HELMHOLTZ-ZENTRUM POTSDAM -DEUTSCHES GEOFORSCHUNGSZENTRUM GFZ -GLOBALES GEOMONITORING U. SCHWEREFELD Telegrafenberg Gebäude A17 ∣14473 Potsdam;

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  • 正文语种 eng
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  • 关键词

    Spring gravimeter; tidal and non-tidal gravity variations; mass variability in oceans; crustal deformation; wind-driven storm surge;

    机译：弹簧重力;潮汐和非潮汐重力变化;海洋中的质量变异性;地壳变形;风暴风暴浪涌;

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