Sea-level rise and warming mediate coastal groundwater discharge in the Arctic
Sea-level rise and warming mediate coastal groundwater discharge in the Arctic
复制标题
海平面上升和变暖调节北极沿海地下水排放
DOI：
10.1088/1748-9326/ac6085
复制
发表时间：
2022
影响因子：
6.7
通讯作者：
Kurylyk, Barret L.
中科院分区：
文献类型：
--
作者：
Guimond, Julia A.;Mohammed, Aaron A.;Walvoord, Michelle A.;Bense, Victor F.;Kurylyk, Barret L.
地下水排放是淡水和相关溶质输送到海洋的一个重要机制。多年冻土环境传统上被认为是水文地质不活跃的，但随着气候变化和多年冻土融化的加速，地下水流动路径正在激活并打开与沿海地区的地下连接。虽然变暖有可能增加陆地与海洋的连通性，但海平面变化有可能改变陆地与海洋的水力梯度，并加强沿海永久冻土的融化，从而产生复杂的相互作用，这将决定未来沿着北极海岸线的地下水排放动态。在这里，我们使用一个最近开发的冻土水文模型，模拟变密度地下水流和盐度依赖的冻融，调查海平面变化和陆地和海洋变暖的幅度，空间分布和沿海地下水排放的盐度的影响。结果表明，随着气候变化，排放量会增加和减少，这取决于变暖和海平面变化的速度。在高变暖和低海平面上升的情况下，结果显示，到2100年，沿海地下水排放量将增加58%，这是由于形成了一个永久冻土层上的含水层，增加了向沿海地区的淡水输送。随着海平面上升速度的加快，由于海平面上升降低了陆海水力梯度，由于变暖而增加的排放量减少到21%。在较低的变暖情景下，未建立永久冻土层上地下水流量，排放量在1980年至2100年期间减少了26%，高海平面上升情景下仅增加了8%。因此，变暖率较高、海平面变化率较低的地区（如加拿大北方努纳武特）的排放量将比变暖率较低、海平面变化率较高的地区增加得更多。排放的规模、位置和盐度对沿海地区的生态系统功能、水质和碳动态具有重要影响。
Groundwater discharge is an important mechanism through which fresh water and associated solutes are delivered to the ocean. Permafrost environments have traditionally been considered hydrogeologically inactive, yet with accelerated climate change and permafrost thaw, groundwater flow paths are activating and opening subsurface connections to the coastal zone. While warming has the potential to increase land-sea connectivity, sea-level change has the potential to alter land-sea hydraulic gradients and enhance coastal permafrost thaw, resulting in a complex interplay that will govern future groundwater discharge dynamics along Arctic coastlines. Here, we use a recently developed permafrost hydrological model that simulates variable-density groundwater flow and salinity-dependent freeze-thaw to investigate the impacts of sea-level change and land and ocean warming on the magnitude, spatial distribution, and salinity of coastal groundwater discharge. Results project both an increase and decrease in discharge with climate change depending on the rate of warming and sea-level change. Under high warming and low sea-level rise scenarios, results show up to a 58% increase in coastal groundwater discharge by 2100 due to the formation of a supra-permafrost aquifer that enhances freshwater delivery to the coastal zone. With higher rates of sea-level rise, the increase in discharge due to warming is reduced to 21% as sea-level rise decreased land-sea hydraulic gradients. Under lower warming scenarios for which supra-permafrost groundwater flow was not established, discharge decreased by up to 26% between 1980 and 2100 for high sea-level rise scenarios and increased only 8% under low sea-level rise scenarios. Thus, regions with higher warming rates and lower rates of sea-level change (eg northern Nunavut, Canada) will experience a greater increase in discharge than regions with lower warming rates and higher rates of sea-level change. The magnitude, location and salinity of discharge have important implications for ecosystem function, water quality, and carbon dynamics in coastal zones.
登录
查看更多内容
影响因子：
11.4
作者：
N. Dimova;A. Paytan;J. Kessler;K. Sparrow;Fenix Garcia‐Tigreros Kodovska;A. Lecher;Joseph Murray;S. Tulaczyk
通讯作者：
N. Dimova;A. Paytan;J. Kessler;K. Sparrow;Fenix Garcia‐Tigreros Kodovska;A. Lecher;Joseph Murray;S. Tulaczyk
模拟受永久冻土影响的地下水系统中的反应性溶质运移
影响因子：
5.4
作者：
A. Mohammed;V. Bense;B. Kurylyk;R. Jamieson;L. Johnston;Amy Jackson
通讯作者：
Amy Jackson
盐水入侵加剧了沿海永久冻土融化
影响因子：
5.2
作者：
Guimond, Julia A.;Mohammed, Aaron A.;Walvoord, Michelle A.;Bense, Victor F.;Kurylyk, Barret L.
通讯作者：
Kurylyk, Barret L.
影响因子：
25.2
作者：
I. Haigh;Mark D. Pickering;J. Green;B. Arbic;A. Arns;S. Dangendorf;D. Hill;K. Horsburgh;T. Howard;D. Idier;D. Jay;Leon Jänicke;S. Lee;Malte Müller;M. Schindelegger;S. Talke;S. Wilmes;P. Woodworth
通讯作者：
I. Haigh;Mark D. Pickering;J. Green;B. Arbic;A. Arns;S. Dangendorf;D. Hill;K. Horsburgh;T. Howard;D. Idier;D. Jay;Leon Jänicke;S. Lee;Malte Müller;M. Schindelegger;S. Talke;S. Wilmes;P. Woodworth
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
T. James;J. Henton;L. Leonard;A. Darlington;D. Forbes;M. Craymer
通讯作者：
M. Craymer