Results 141 to 150 of about 63,064 (168)

Nitrogen transformations within a tropical subterranean estuary

Marine Chemistry, 2014
A detailed geochemical groundwater survey was conducted within a carbonate sand subterranean estuary (STE) system on the tropical island of Rarotonga, Cook Islands, to identify N sources and transformation along the groundwater flow paths. There were two distinct sources of N to the STE: (1) local organic material which produced NI-Et in the anoxic ...
Bradley D. Eyre, Kevin M. Befus, Douglas Tait   +2 more
exaly   +5 more sources

Methane oxidation dynamics in a karst subterranean estuary

Geochimica Et Cosmochimica Acta, 2020
Abstract Chemical gradients between fresh, brackish and saline waters shape biogeochemical reactions and organic matter transformation within subterranean estuaries. In the Yucatan Peninsula’s karst subterranean estuary (KSE), methane and dissolved organic matter generated during the anaerobic decomposition of tropical forest vegetation are ...
David Brankovits, John W Pohlman
exaly   +3 more sources

Hydrologic Controls of Methane Dynamics in Karst Subterranean Estuaries [PDF]

Global Biogeochemical Cycles, 2018
Abstract Karst subterranean estuaries (KSEs) extend into carbonate platforms along 12% of all coastlines. A recent study has shown that microbial methane (CH 4 ) consumption is an important component of the carbon cycle and food web dynamics within flooded caves that ...
David Brankovits, Neil K. Ganju, John W Pohlman   +2 more
exaly   +3 more sources

Seasonality of major redox constituents in a shallow subterranean estuary

Geochimica Et Cosmochimica Acta, 2018
Abstract The subterranean estuary (STE), the subsurface mixing zone of outflowing fresh groundwater and infiltrating seawater, is an area of extensive geochemical reactions that determine the composition of groundwater that flows into coastal environments. This study examined the porewater composition of a shallow STE (
Aaron J Beck
exaly   +4 more sources

Effects of multi-constituent tides on a subterranean estuary

Advances in Water Resources, 2019
Subterranean estuary, as a saltwater-freshwater mixing zone in a coastal aquifer, is significantly affected by tides. While many studies have been conducted to examine the effects of tides on groundwater dynamics in subterranean estuaries in relation to submarine groundwater discharge and seawater intrusion, the focus of the investigation, particularly
Xiayang Yu, Pei Xin, Shen S.J. Wang, Chengji Shen, Ling Li   +4 more
openaire   +4 more sources

New perspectives on radium behavior within a subterranean estuary [PDF]

Marine Chemistry, 2008
Over the past decade, radium isotopes have been frequently applied as tracers of submarine groundwater discharge (SGD). The unique radium signature of SGD is acquired within the subterranean estuary, a mixing zone between fresh groundwater and seawater in coastal aquifers, yet little is known about what controls Ra cycling in this system.
Meagan Eagle Gonneea, Henrietta Dulai, Matthew A Charette   +2 more
exaly   +3 more sources

Fingering Flow in the Subterranean Estuary under Tidal Influence

2023
In a coastal aquifer under tidal influence, seawater recirculates beneath the intertidal zone along the classical saltwater wedge (SW). The recirculating seawater on top of the saltwater wedge is called upper saline plume (USP). In between the USP and SW, a freshwater discharge tube (FDT) prevails.
Rezwana Binte Delwar, Nele Grünenbaum, Janek Greskowiak, Gudrun Massmann   +3 more
openaire   +1 more source

Distribution of anaerobic ammonia-oxidizing bacteria in a subterranean estuary

Marine Chemistry, 2012
The traditional paradigm that rivers and terrestrial run-off are the major contributors of nutrients to coastal waters has been challenged by observations that nutrient fluxes originating from coastal aquifer subterranean estuaries can equal or even exceed that of other terrestrial sources.
Sáenz, J.P., Hopmans, E.C., Rogers, D., Henderson, P.B., Charette, M.A., Schouten, S., Casciotti, K.L., Sinninghe Damsté, J.S., Eglinton, T.I.   +8 more
openaire   +2 more sources

Global coastal groundwater and subterranean estuary nutrients

2023
These data were compiled from original and published datasets of coastal groundwater / subterranean estuary research efforts along global coastline (sites within 1km of shoreline). The dataset includes sampling site names, locations, original sample information, sample depth, temperature, salinity, dissolved nitrogen concentrations, and dissolved ...
Wilson, Stephanie, Moody, Amy, Mckenzie, Tristan, Cardenas, M Bayani, Luijendijk, Elco, Sawyer, Audrey, Wilson, Alicia, Michael, Holly, Bochao, Xu, Knee, Karen, Cho, Hyung-Mi, Weinstein, Yishai, Paytan, Adina, Moosdorf, Nils, Chen, Chen-Tung Arthur, Beck, Melanie, Lopez, Cody, Murgulet, Dorina, Kim, Guebuem, Charette, Matt, Waska, Hannelore, Ibánhez, J Severino, Chaillou, Gwénaëlle, Oehler, Till, Onodera, Shin-Ichi, Saito, Mitsuyo, Rodellas, Valenti, Dimova, Natasha, Montiel, Daniel, Dulai, Henrietta, Du, Jinzhou, Petermann, Eric, Chen, Xiaogang, Davis, Kay, Lamontagne, Sebastien, Sugimoto, Ryo, Wang, Guizhi, Torres, Américo, Demir, Cansu, Bristol, Emily, Connolly, Craig, Mcclelland, Jim, Silva, Brenno Januario, Tait, Douglas, Kumar, Bsk, Viswanadham, R, Sarma, Vedula, Silva-Filho, Emmanoel Vieira, Shiller, Alan, Lecher, Alanna, Tamborski, Joe, Bokuniewicz, Henry, Rocha, Carlos, Reckhardt, Anja, Böttcher, Michael Ernst, Jiang, Shan, Stieglitz, Thomas, Charbonnier, Céline, Anschutz, Pierre, Hernandez-Terrones, Laura, Babu, Suresh, Szymczycha, Beata, Sadat-Noori, Mahmood, Niencheski, Luis Felipe Hax, Null, Kimberly, Tobias, Craig, Song, Bongkeun, Anderson, Iris, Santos, Isaac   +68 more
openaire   +2 more sources

Numerical analysis of the abiotic formation and distribution of the “iron curtain” in subterranean estuaries

Environmental Modelling & Software
Precipitation of Fe (hydr)oxides (such as Fe(OH)) in subterranean estuaries can form a low-permeable zone, referred to as the “iron curtain”, of which the genesis, distribution, and influencing factors remain unclear. This study investigated the abiotic formation of iron curtains under variable seawater and freshwater conditions using the numerical ...
Tao Wang, Chenming Zhang, Ye Ma, Harald Hofmann, Congrui Li, Zicheng Zhao   +5 more
openaire   +3 more sources