The flow of fresh groundwater may provide substantial inputs of nutrients and solutes to the oceans. However, the extent to which hydrogeological parameters control groundwater flow to the world's oceans has not been quantified systematically. Here we present a spatially resolved global model of coastal groundwater discharge to show that the contribution of fresh groundwater accounts for ~0.6% (0.004%-1.3%) of the total freshwater input and ~2% (0.003%-7.7%) of the solute input for carbon, nitrogen, silica and strontium. However, the coastal discharge of fresh groundwater and nutrients displays a high spatial variability and for an estimated 26% (0.4%-39%) of the world's estuaries, 17% (0.3%-31%) of the salt marshes and 14% (0.1-26%) of the coral reefs, the flux of terrestrial groundwater exceeds 25% of the river flux and poses a risk for pollution and eutrophication.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7062736 | PMC |
| http://dx.doi.org/10.1038/s41467-020-15064-8 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Old but not ancient: Rock-leached organic carbon drives groundwater microbiomes.
Sci Total Environ
December 2024
Aquatic Geomicrobiology, Institute of Biodiversity, Friedrich Schiller University, Jena, Germany; Cluster of Excellence Balance of the Microverse, Friedrich Schiller University Jena, Jena, Germany; German Center for Integrative Biodiversity Research (iDiv) Halle-Jena_Leipzig, Germany. Electronic address:
More than 90% of earth's microbial biomass resides in the continental subsurface, where sedimentary rocks provide the largest source of organic carbon (C). While many studies indicate microbial utilization of fossil C sources, the extent to which rock-organic C is driving microbial activities in aquifers remains largely unknown. Here we incubated oxic and anoxic groundwater with crushed carbonate rocks from the host aquifer and an outcrop rock of the unsaturated zone characterized by higher organic C content, and compared the natural abundance of radiocarbon (C) of available C pools and microbial biomarkers.
View Article and Find Full Text PDFApplying the Quadrant Method for Pumping-Trace Metal Correlations in Variable Time, Low-Data Systems.
Ground Water
December 2024
School of Geosciences, University of Oklahoma, 100 East Boyd Street, RM 710, Norman, OK, 73019.
Due to increasing global demand for fresh water, it is increasingly necessary to understand how aquifer pumping affects groundwater chemistry. However, comprehensive predictive relationships between pumping and groundwater quality have yet to be developed, as the available data, which are often collected over inconsistent time intervals, are poorly suited for long-term historical correlation studies. For example, we needed an adequate statistical method to better understand relationships between pumping rate and water quality in the City of Norman (OK, USA).
View Article and Find Full Text PDFWater-Rock Interaction and Freeze-Thaw Cycles as Drivers of Acid Rock Drainage Generation by a Rock Glacier in the European Alps.
ACS ES T Water
December 2024
Department of Ecology, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria.
Little is known to date about the processes governing natural acid rock drainage (NARD) generated by rock glaciers. We used paragneiss samples from a catchment with NARD generated by a rock glacier in the Italian Alps for long-term leaching experiments under conditions that are possible within rock glaciers. The findings clearly suggest that at a low acid neutralization capacity of the rock, the dissolution of sulfide minerals, even if they are present in trace amounts, may be the most important process that controls the groundwater acidity at 1 °C, a typical temperature of groundwater discharge from rock glaciers.
View Article and Find Full Text PDFRevealing nitrate sources seasonal difference between groundwater and surface water in China's largest fresh water lake (Poyang Lake): Insights from sources proportion, dynamic evolution and driving forces.
Sci Total Environ
December 2024
College of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Tracing the source of nitrate is the key path to solve the problem of nitrogen pollution. However, the seasonal difference of nitrate sources in groundwater and surface water and its dynamic evolution process and mechanism in large fresh water lake area are still not clear. In this study, 126 water samples were collected from groundwater and surface water in China's largest fresh water lake (Poyang Lake) region from 2022 to 2023.
View Article and Find Full Text PDFInvestigations on the saline groundwater pumping method and its impact on active saltwater intrusion on a layered aquifer system.
J Environ Manage
December 2024
Dept. of Civil Engineering, Indian Institute of Technology (IIT) Bombay, Mumbai, 400076, Maharashtra, India. Electronic address:
Active saltwater intrusion (ASWI) accelerates and intensifies salinization due to buoyancy force-induced density differences and concurrent inland fresh groundwater flow. This study investigates saline groundwater (SGW) pumping as a remediation technique for ASWI through experimental and field-scale analyses in a layered aquifer system characterised by diminishing permeability with depth. Experiments demonstrated that higher permeability layers reduced length of intrusion (Ltoe) whereas lower permeability layers restricted vertical displacement.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!