Journal ArticleDOI
The Effect of Submarine Groundwater Discharge on the Ocean
Reads0
Chats0
TLDR
Tracer studies reveal that submarine groundwater discharge provides globally important fluxes of nutrients, carbon, and metals to coastal waters.Abstract:
The exchange of groundwater between land and sea is a major component of the hydrological cycle. This exchange, called submarine groundwater discharge (SGD), is comprised of terrestrial water mixed with sea water that has infiltrated coastal aquifers. The composition of SGD differs from that predicted by simple mixing because biogeochemical reactions in the aquifer modify its chemistry. To emphasize the importance of mixing and chemical reaction, these coastal aquifers are called subterranean estuaries. Geologists recognize this mixing zone as a site of carbonate diagenesis and dolomite formation. Biologists have recognized that terrestrial inputs of nutrients to the coastal ocean may occur through subterranean processes. Further evidence of SGD comes from the distribution of chemical tracers in the coastal ocean. These tracers originate within coastal aquifers and reach the ocean through SGD. Tracer studies reveal that SGD provides globally important fluxes of nutrients, carbon, and metals to coastal waters.read more
Citations
More filters
Journal ArticleDOI
Seawater intrusion processes, investigation and management: Recent advances and future challenges
Adrian D. Werner,Mark Bakker,Vincent E. A. Post,Alexander Vandenbohede,Chunhui Lu,Behzad Ataie-Ashtiani,Craig T. Simmons,David Andrew Barry +7 more
TL;DR: A review of the state of the art in sea intrusion research can be found in this article, where the authors subdivide SI research into three categories: process, mea- surement, prediction and management.
Journal ArticleDOI
Estuarine and Coastal Ocean Carbon Paradox: CO2 Sinks or Sites of Terrestrial Carbon Incineration?
TL;DR: It is demonstrated here that CO2 release in estuaries is largely supported by microbial decomposition of highly productive intertidal marsh biomass, thus leading to more dissolved inorganic carbon export to the ocean.
Journal ArticleDOI
The driving forces of porewater and groundwater flow in permeable coastal sediments: a review
TL;DR: In this paper, the authors reviewed the drivers of porewater and groundwater advection in permeable shelf sediments in an attempt to bridge gaps among different disciplines studying similar problems, and identified the following driving forces: (1) terrestrial hydraulic gradients, (2) seasonal changes in the aquifer level on land moving the location of the subterranean estuary, (3) wave setup and tidal pumping, (4) water level differences across permeable barriers, (5) flow-and topography-induced pressure gradient, (6) wave pumping; ripple and other
Journal ArticleDOI
Offshore fresh groundwater reserves as a global phenomenon
TL;DR: The scope for continental shelf hydrogeology is broader and it is envisaged that it can contribute to the advancement of other scientific disciplines, in particular sedimentology and marine geochemistry.
Journal ArticleDOI
Global estimate of submarine groundwater discharge based on an observationally constrained radium isotope model
Eun Young Kwon,Guebuem Kim,François Primeau,Willard S. Moore,Hyung Mi Cho,Tim DeVries,Jorge L. Sarmiento,Matthew A. Charette,Yang-Ki Cho +8 more
TL;DR: Using an inverse model combined with a global compilation of 228Ra observations, this article showed that SGD is the dominant pathway for dissolved terrestrial materials to the global ocean, and this necessitates revisions for the budgets of chemical elements including carbon.
References
More filters
Book
Early Diagenesis: A Theoretical Approach
TL;DR: In this article, Berner developed the mathematical theory of early diagenesis, introducing a general diagenetic equation and discussing it in terms of each major diagenetics process, including diffusion, compaction, pore-water flow, burial advection, bioturbation, adsorption, radioactive decay and especially chemical and biochemical reactions.
Journal ArticleDOI
Iron deficiency limits phytoplankton growth in the north-east Pacific subarctic
TL;DR: In this article, the authors reported that the addition of nmol amounts of dissolved iron resulted in the nearly complete utilization of excess NO3, whereas in the controls, without added Fe, only 25% of the available NO3 was used.
Journal ArticleDOI
Large groundwater inputs to coastal waters revealed by 226 Ra enrichments
TL;DR: In this paper, the authors report large enrichments of 226Ra in coastal waters of the South Atlantic Bight and demonstrate that groundwater discharge is the main source of the 226Ra surplus, and conclude that the groundwater flux to these coastal waters must be about 40% of the river-water flux during the study period.
Journal ArticleDOI
Atmospheric transport of iron and its deposition in the ocean
Robert A. Duce,Neil Tindale +1 more
TL;DR: The atmospheric transport of continental weathering products is responsible for much of the mineral material and Fe entering the open ocean and is probably the dominant source of nutrient Fe in the photic zone as discussed by the authors.
Journal ArticleDOI
Estimates of Freshwater Discharge from Continents: Latitudinal and Seasonal Variations
Aiguo Dai,Kevin E. Trenberth +1 more
TL;DR: In this paper, the most accurate estimate is based on streamflow data from the world's largest 921 rivers, supplemented with estimates of discharge from unmonitored areas based on the ratios of runoff and drainage area between the un-monitored and monitored regions.
Related Papers (5)
Quantifying Submarine Groundwater Discharge in the Coastal Zone via Multiple Methods
William C. Burnett,Pradeep K. Aggarwal,Alice Aureli,Henry Bokuniewicz,Jaye E. Cable,Matthew A. Charette,Evgeny A. Kontar,Steve L. Krupa,Kshitij M. Kulkarni,A. Loveless,Willard S. Moore,June A. Oberdorfer,Joselene de Oliveira,N. Nur Ozyurt,Pavel P. Povinec,A.M.G. Privitera,Rudi Rajar,Roshan T Ramessur,Jan Scholten,Thomas Stieglitz,Makoto Taniguchi,Jeffrey V. Turner +21 more