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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Investigation of Fennoscandian glacial isostatic adjustment using modern sea level records
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Investigation of Fennoscandian glacial isostatic adjustment using modern sea level records

机译：利用现代海平面记录调查芬斯堪的纳维亚冰川等静压

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We present a new method for determining the rates from a network of regional tide gauge data. The method involves using a model for the sea level observations (annual averages of relative sea level) that explicitly includes a term for the interannual sealevel variations, which are assumed to be constant for all sites in the network. The resulting simultaneous analysis of all the sea level observations yields sea level rates which are biased by the unknown temporal slope of the interannual variations. By differencing sea level rate estimates with respect to one site, "site-referenced" sea level rates are calculated which are free from this bias. The differencing procedure also removes any signal due to a common sea level rate, such as might be associated with eustatic sea level rise. The resulting site-referenced sea level rates therefore in principle reflect only the relative vertical crustal motions of the tide gauge sites with respect to the geoid. These site-referenced sea level rates represent a potentially more accurate data set than have previously been used for sea level studies. WE have used these rates to investigate glacial isostatic adjustment (GIA) in Fennoscandia. Specifically, we have used the site-referenced sea level rates within the Baltic Sea to estimate adjustments to the ice history and Earth model which are used to calculate vertical rates of adjustment due to GIA, a method never before used for Fennoscandia. The parameters selected were lithospheric thickness, the viscosities of (assumed isoviscous) upper and lower mantles, and a Fennoscandian ice thickness scaling parameter. We present the results of this estimation procedure for a specific test ice model. We also find evidence that the sea level record for the site nearest the center of uplift, Furuogrund, may be contaminated by systematic errors of unknown origin. Data from this site have previously been used to determine a rate for the maximum uplift that we find is perhaps 1 mm yr~(-1), or approx 10%, too large.
机译：我们提出了一种从区域潮汐仪数据网络中确定水价的新方法。该方法涉及使用模型进行海平面观测（相对海平面的年度平均值），该模型明确包含年际海平面变化的术语，该假设对于网络中的所有站点都是恒定的。对所有海平面观测结果进行的同时分析得出的海平面变化率受到年际变化的未知时间斜率的影响。通过对一个站点的海平面速率估计值进行差异，可以计算出不受该偏差影响的“站点参考”海平面速率。差分程序还消除了由于共同的海平面速率而引起的任何信号，例如可能与欣喜的海平面上升相关。因此，所得到的以地点为基准的海平面速率原则上仅反映潮汐仪地点相对于大地水准面的相对垂直地壳运动。这些以地点为基准的海平面速率比以前用于海平面研究的数据集可能更准确。我们已使用这些比率研究芬诺斯堪迪亚的冰川等静压调整（GIA）。具体而言，我们已使用波罗的海内以地点为基准的海平面速率来估计对冰历史和地球模型的调整，这些调整用于计算由于GIA而导致的垂直调整速率，而GIA是芬诺斯堪的亚以前从未使用过的方法。选择的参数是岩石圈厚度，上地幔和下地幔的粘度（假定等粘度），以及芬诺斯堪的亚冰厚度缩放参数。我们介绍了针对特定测试冰模型的估算程序的结果。我们还发现有证据表明，离隆升中心最近的站点Furuogrund的海平面记录可能被未知来源的系统误差所污染。以前曾使用该站点的数据来确定最大隆升的速率，我们发现该速率可能是1 mm yr〜（-1），或大约10％，太大。

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