River-discharge effects on United States Atlantic and Gulf coast sea-level changes.
River-discharge effects on United States Atlantic and Gulf coast sea-level changes.
复制标题
DOI：
10.1073/pnas.1805428115
复制
发表时间：
2018-07-24
影响因子：
11.1
通讯作者：
Lentz SJ
中科院分区：
文献类型：
--
作者：
Piecuch CG;Bittermann K;Kemp AC;Ponte RM;Little CM;Engelhart SE;Lentz SJ
河流流量对沿海海洋环流产生重要影响，但作为历史沿海海平面变化和未来沿海洪水风险的驱动因素却被忽视。我们探讨观测到的河流流量和海平面之间的关系，在美国大西洋和墨西哥湾沿岸的年际和更长的时间。我们制定了一个理论，预测观测到的河流流量和海平面之间的对应关系，展示了这两个变量之间的因果关系。我们的研究结果突出了沿海海平面的一个重要但被忽视的驱动因素，表明需要（1）提高沿海地区遥感和建模的分辨率，以及（2）在气候模型中纳入现实的河流径流变化。确定造成沿海海平面历史变化的物理过程对于预测未来的影响非常重要。最近的研究试图了解美国大西洋和墨西哥湾沿岸海平面年际至数十年变化的驱动因素。海洋动力学、陆地水储存、垂直陆地运动和陆地冰的融化被强调为这些时间尺度上沿着这一人口密集海岸海平面变化的重要机制。虽然已知对沿海海洋环流有重要的控制作用，但在最近关于海平面变化驱动因素的讨论中，没有提到可变的河流流量。我们更新了20世纪70年代的计算结果，比较了1910-2017年期间缅因州湾、中大西洋湾、南大西洋湾和墨西哥湾沿着的河流流量和沿海海平面数据。我们发现，河流流量和海平面的变化显着相关（），如海平面上升0.01和0.08厘米之间的1年河流流量增加，取决于地区。我们制定了一个理论，描述了河流流量和盐地海平面变化之间的关系（即，与盐度有关的海平面变化）作为河流流量、地球自转和密度分层的函数。这一理论正确地预测了观测到的增量海平面变化每单位河流流量异常的顺序，建议的因果关系。我们的研究结果对遥感，气候建模，解释共同时代代理海平面重建，并预测沿海洪水风险的影响。
River discharge exerts an important influence on coastal ocean circulation but has been overlooked as a driver of historical coastal sea-level change and future coastal flood risk. We explore the relation between observed river discharge and sea level on the United States Atlantic and Gulf coasts over interannual and longer periods. We formulate a theory that predicts the observed correspondence between river discharge and sea level, demonstrating a causal relation between the two variables. Our results highlight a significant but overlooked driver of coastal sea level, indicating the need for (1) improved resolution in remote sensing and modeling of the coastal zone and (2) inclusion of realistic river runoff variability in climate models. Identifying physical processes responsible for historical coastal sea-level changes is important for anticipating future impacts. Recent studies sought to understand the drivers of interannual to multidecadal sea-level changes on the United States Atlantic and Gulf coasts. Ocean dynamics, terrestrial water storage, vertical land motion, and melting of land ice were highlighted as important mechanisms of sea-level change along this densely populated coast on these time scales. While known to exert an important control on coastal ocean circulation, variable river discharge has been absent from recent discussions of drivers of sea-level change. We update calculations from the 1970s, comparing annual river-discharge and coastal sea-level data along the Gulf of Maine, Mid-Atlantic Bight, South Atlantic Bight, and Gulf of Mexico during 1910–2017. We show that river-discharge and sea-level changes are significantly correlated (), such that sea level rises between 0.01 and 0.08 cm for a 1 annual river-discharge increase, depending on region. We formulate a theory that describes the relation between river-discharge and halosteric sea-level changes (i.e., changes in sea level related to salinity) as a function of river discharge, Earth’s rotation, and density stratification. This theory correctly predicts the order of observed increment sea-level change per unit river-discharge anomaly, suggesting a causal relation. Our results have implications for remote sensing, climate modeling, interpreting Common Era proxy sea-level reconstructions, and projecting coastal flood risk.
登录
查看更多内容
影响因子：
3.6
作者：
Chant, Robert J.;Glenn, Scott M.;Schofield, Oscar
通讯作者：
Schofield, Oscar
影响因子：
3.5
作者：
Landerer, Felix W.;Jungclaus, Johann H.;Marotzke, Jochem
通讯作者：
Marotzke, Jochem
影响因子：
5.2
作者：
Calafat, F. M.;Chambers, D. P.
通讯作者：
Chambers, D. P.
DOI：
10.1029/jb091ib09p09081
发表时间：
1986-08-10
期刊：
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS
影响因子：
--
作者：
CHELTON, DB;ENFIELD, DB
通讯作者：
ENFIELD, DB
影响因子：
--
作者：
Holgate, Simon J.;Matthews, Andrew;Pugh, Jeff
通讯作者：
Pugh, Jeff