Crustal uplift and sea level rise in northern Cascadia from GPS, absolute gravity, and tide gauge data
Crustal uplift and sea level rise in northern Cascadia from GPS, absolute gravity, and tide gauge data
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根据 GPS、绝对重力和潮汐计数据得出的卡斯卡迪亚北部地壳抬升和海平面上升
DOI：
10.1029/2007gl030283
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发表时间：
2007
影响因子：
5.2
通讯作者：
H. Dragert
中科院分区：
文献类型：
--
作者：
Stephane Mazzotti;Anthony Lambert;N. Courtier;L. Nykolaishen;H. Dragert
我们结合联合收割机的数据，从9个GPS，绝对重力，验潮站，以估计海平面上升，垂直运动和固体地球过程之间的关系在太平洋西北部。全球定位系统垂直速度（ITRF 2000）和绝对重力率有很好的相关性，梯度为0.2 ± 0.1 μGal mm−1，但显示出0.53 ± 0.30 μGal yr−1（2.2 ± 1.3 mm yr−1）的显著偏移（95%置信度）。验潮仪和GPS数据表明，东北太平洋区域海平面上升1.7 ± 0.5毫米/年，与ITRF 2000对齐，或不太可能的区域海平面下降-0.5 ± 0.5毫米/年，与绝对重力对齐。虽然我们不能排除GPS参考框架对准中的偏差，但我们的结果表明，来自未知近地表或深层来源的长周期质量增加可能存在绝对重力偏差。这种质量增加对重力、垂直运动和海平面的影响仍有待确定。
We combine data from nine GPS, absolute gravity, and tide gauge stations to estimate the relation between sea‐level rise, vertical motion, and solid Earth processes in the Pacific Northwest. GPS vertical velocities (in ITRF2000) and absolute gravity rates are well correlated, with a gradient of 0.2 ± 0.1 μGal mm−1, but show a significant offset of 0.53 ± 0.30 μGal yr−1 (2.2 ± 1.3 mm yr−1) (95% confidence). Tide gauge and GPS data indicate a northeast Pacific regional sea‐level rise of 1.7 ± 0.5 mm yr−1, aligned to ITRF2000, or an unlikely regional sea‐level fall of −0.5 ± 0.5 mm yr−1, aligned to absolute gravity. Although we cannot rule out a bias in the GPS reference‐frame alignment, our results suggest a possible absolute gravity bias by a long‐period mass increase from an unknown near‐surface or deep‐seated source. The impact of such a mass increase on gravity, vertical motion, and sea level remains to be defined.