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首页> 外文会议>2014 IEEE/OES Baltic International Symposium : Measuring and modeling of multi-scale interactions in the marine environment: Book of abstracts >Correcting tide gauge series due to land uplift and differences between national height systems of the baltic sea countries
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Correcting tide gauge series due to land uplift and differences between national height systems of the baltic sea countries

机译：纠正由于陆地隆起和波罗的海国家的国家高度系统之间的差异而引起的潮汐量表系列

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Different types of tide gauges (TG) are used to monitor sea level dynamics around the Baltic Sea. They are usually connected to national levelling network and several of them are linked into regional networks (e.g. Baltic Operational Oceanographic System). The sea level readings are used for nautical navigation, modelling and forecasting of sea level changes. Long-term and historical sea level series are also useful in studying regional land uplift/subsidence or calibrating satellite altimetry data. Both tasks require precise knowledge of interconnections between height systems of countries surrounding the same sea. Presently, however, six different height reference systems are in official use in the Baltic Sea countries. Even though all these systems are based on mean sea level (MSL) observations averaged over different time-periods, but different reference TG and tidal systems have been adopted for national height systems. The differences of national height systems between the countries around the Baltic Sea can reach up to 20 cm. Overlooking this yields undesirable systematic biases between regional TG data. Additionally, the entire Fennoscandia is affected by apparent land uplift at the velocity rate up to +9 mm/year, primarily due to the viscoelastic response of the solid Earth resulting from the de-glaciation of the Pleistocene ice-sheets. Over a time span this causes notable distortions of height system realisations even within a country. Therefore, the land uplift corrections should be also taken into account in sea level series, which are used for modelling and forecasting of sea level changes. A case study in West-Estonian Archipelago involves a recently developed land uplift model EST2013LU, which is based on four repeated high-precision levelling data from 1933 to 2010. Also connections between levelling network and TG series are analysed. The results reveal that discrepancies due to obsoleteness of the heights in the national height system may - ause discrepancies in series of nearby located tide gauges up to 7 cm.
机译：不同类型的潮汐仪（TG）用于监测波罗的海周围的海平面动态。它们通常连接到国家水准测量网络，其中一些连接到区域网络（例如，波罗的海操作海洋学系统）。海平面读数用于航海，海平面变化的建模和预测。长期和历史海平面序列对于研究区域陆地隆起/沉降或校准卫星测高数据也很有用。两项任务都需要精确了解围绕同一海洋的国家的高度系统之间的相互联系。但是，目前，波罗的海国家正式使用了六个不同的高度参考系统。即使所有这些系统都是基于在不同时间段内平均的平均海平面（MSL）观测值，但是国家高度系统仍采用了不同的参考TG和潮汐系统。波罗的海周围国家之间的国家高度系统的差异可以达到20厘米。忽略这一点会在区域TG数据之间产生不良的系统偏差。此外，整个芬诺斯坎迪亚州受到表层土地隆升的影响，速率高达+9毫米/年，这主要是由于更新世冰盖冰川消融导致的固体地球的粘弹性响应。在一段时间内，即使在一个国家内，这也会导致高度系统实现的明显失真。因此，在海平面系列中也应考虑到陆地隆升的校正，这些校正用于海平面变化的建模和预测。西爱沙尼亚群岛的一个案例研究涉及最近开发的陆地隆升模型EST2013LU，该模型基于1933年至2010年的四个重复的高精度水准测量数据。还分析了水准测量网络与TG系列之间的联系。结果表明，由于国家身高系统中的高度过时而导致的差异可能会-导致一系列位于7厘米附近的潮汐仪出现差异。

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