CCPortal
DOI10.1029/2019JC015656
Sea Level, Tidal, and River Flow Trends in the Lower Columbia River Estuary, 1853–present
Talke S.A.; Mahedy A.; Jay D.A.; Lau P.; Hilley C.; Hudson A.
发表日期2020
ISSN21699275
卷号125期号:3
英文摘要Few tidal records are available pre-1900 for the Pacific Ocean. We improve data coverage by recovering historical tabulations and digitizing analog tide rolls from Astoria, Oregon, for 1853–1876. Nearly 13,500 overlapping images of tides from 1855–1870 were digitized at a 6 min resolution using a line-finding algorithm. Available hourly and high/low tabulations were also digitized, as were nearby hourly records from 1933 to 1943. Uncertainty was assessed by evaluating manual staff measurements, historical documents, and leveling surveys. Results suggest that uncertainty in mean sea level varies from ±0.07 m (early 1850s) to ±0.03 m (1867–1876) and is driven primarily by datum and benchmark uncertainty, rather than measurement precision, data reduction procedures, or hydrodynamic changes. We also corrected an up-to 0.05 m error in the 1925–1960 tidal datum at Astoria. Harmonic analysis shows that major tidal constituents increased by up to 7% between 1855 and 2018. Mean tidal range increased by 0.1 m (5%), with more change occurring in July (0.17 m larger) than winter (0.07 m larger). By contrast, sea level increased most in winter and least in spring/summer. Tidally based estimates of river discharge suggest that these observations are caused by a ~50% reduction in peak spring discharge and a 30–60% increase in winter discharge. No evidence of altered upwelling is found. Overall, Astoria relative sea level (RSL) increased by 0.06 m ± 0.04 m since the 1858–1876 epoch or, after accounting for vertical land motion, 0.11 ± 0.09 m. Consistent with GNSS measurements, RSL has dropped near the estuary mouth since 1905, indicating a strong tectonic influence. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词data archeology; estuaries; river flow; sea level rise; tides; vertical land motion
语种英语
来源期刊Journal of Geophysical Research: Oceans
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/186937
作者单位Civil and Environmental Engineering Department, California Polytechnic State University, San Luis Obispo, CA, United States; Civil and Environmental Engineering Department, Portland State University, Portland, OR, United States
推荐引用方式
GB/T 7714
Talke S.A.,Mahedy A.,Jay D.A.,等. Sea Level, Tidal, and River Flow Trends in the Lower Columbia River Estuary, 1853–present[J],2020,125(3).
APA Talke S.A.,Mahedy A.,Jay D.A.,Lau P.,Hilley C.,&Hudson A..(2020).Sea Level, Tidal, and River Flow Trends in the Lower Columbia River Estuary, 1853–present.Journal of Geophysical Research: Oceans,125(3).
MLA Talke S.A.,et al."Sea Level, Tidal, and River Flow Trends in the Lower Columbia River Estuary, 1853–present".Journal of Geophysical Research: Oceans 125.3(2020).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Talke S.A.]的文章
[Mahedy A.]的文章
[Jay D.A.]的文章
百度学术
百度学术中相似的文章
[Talke S.A.]的文章
[Mahedy A.]的文章
[Jay D.A.]的文章
必应学术
必应学术中相似的文章
[Talke S.A.]的文章
[Mahedy A.]的文章
[Jay D.A.]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。