Aquatic Geochemistry

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Carbon dioxide dynamics in rivers and coastal waters of the “big island” of Hawaii, USA, during baseline and heavy rain conditions
Aquatic Geochemistry - Tập 13 - Trang 1-18 - 2006
François S. Paquay, Fred T. Mackenzie, Alberto V. Borges
The distributions of the partial pressure of carbon dioxide (pCO2) and total alkalinity (TA) were examined for a 6-month period in the Wailuku and Wailoa rivers and coastal waters of Hilo Bay on the west coast of the Island of Hawaii, USA. Main results for the largest and turbulent Wailuku River show in the watershed an oversaturation in CO2 with respect to atmospheric equilibrium and a CO2 unders...... hiện toàn bộ
Chemical Analysis of Gaet’ale, a Hypersaline Pond in Danakil Depression (Ethiopia): New Record for the Most Saline Water Body on Earth
Aquatic Geochemistry - Tập 23 - Trang 109-117 - 2017
Eduardo Pérez, Yonas Chebude
The chemical analysis of the water of Gaet’ale Pond, a small water body located in Danakil Depression, Ethiopia, resulted to be the most saline water body on earth with total dissolved solids (TDS) of 433 g kg−1. The composition of the water indicates the predominance of two main salts: CaCl2 and MgCl2 at a proportion of Ca:Mg = 3.1 (w/w). Traces of K+, Na+ and NO3 − are al...... hiện toàn bộ
Arsenic in Porewaters of the Unsaturated Zone of an Argentinean Watershed: Adsorption and Competition with Carbonate as Important Processes that Regulate its Concentration
Aquatic Geochemistry - - 2015
Virginia Puccia, Fabiana Limbozzi, Marcelo Javier Avena
Desert Potholes: Ephemeral Aquatic Microsystems
Aquatic Geochemistry - - 2005
Marjorie A. Chan, Katrina Moser, Jim M. Davis, Gordon Southam, Kebbi Hughes, Tim Graham
An enigma of the Colorado Plateau high desert is the “pothole”, which ranges from shallow ephemeral puddles to deeply carved pools. The existence of prokaryotic to eukaryotic organisms within these pools is largely controlled by the presence of collected rainwater. Multivariate statistical analysis of physical and chemical limnologic data variables measured from potholes indicates spatial and temp...... hiện toàn bộ
Dolomite Versus Calcite Weathering in Hydrogeochemically Diverse Watersheds Established on Bedded Carbonates (Sava and Soča Rivers, Slovenia)
Aquatic Geochemistry - Tập 17 - Trang 357-396 - 2011
Kathryn Szramek, Lynn M. Walter, Tjaša Kanduč, Nives Ogrinc
The relative contributions of dolomite to calcite weathering related to riverine fluxes are investigated on a highly resolved spatial scale in the diverse watersheds of Slovenia, which previous work has shown have some of the highest carbonate-weathering intensities in the world and suggests that dolomite weathering is favored over limestone weathering in mixed carbonate watersheds. The forested S...... hiện toàn bộ
Influence of Diverse Urban Pressures on Water Characteristics in a Small Eastern Mediterranean Watershed
Aquatic Geochemistry - Tập 28 - Trang 111-133 - 2022
E. Maatouk, A. El Samrani, R. Sawan, R. Bou Ghosn Salameh, V. Kazpard, Z. Matar
This work focuses on the characterization of a typical coastal karst watershed by addressing its physico-chemical parameters. The concentrations of the main ions clearly indicate the dominance of Ca2+ and HCO3− with a carbonate weathering rate equivalent to 230t/Km2/year; that is a typical weathering of karst watersheds. The spatio-temporal variability of dissolved organic matter (DOM) is also ass...... hiện toàn bộ
Weathering regime associated with subsurface circulation on volcanic islands
Aquatic Geochemistry - Tập 17 - Trang 221-241 - 2011
Sétareh Rad, Karine Rivé, Claude Jean Allègre
Volcanic islands, being characterized by highly porous basaltic/andesitic lava flows and pyroclastic deposits, are subject to important chemical weathering by subsurface waters. Moreover, such subsurface weathering is impacted by hydrothermal springs in both active and non-active volcanic areas, thus increasing dissolved load concentrations. Here, we focus on the subsurface water chemistry in the ...... hiện toàn bộ
Shrinking Sphere Kinetics for Batch Dissolution of Mixed Particles of a Single Substance at High Under-Saturation: Validation with Sodium Chloride, but with Biogenic Silica in Mind
Aquatic Geochemistry - Tập 14 - Trang 359-379 - 2008
Victor W. Truesdale
The cubic equation recently derived for the increase in concentration of a solute with time, as the solid dissolves in batch according to the shrinking sphere model at high under-saturation, is extended to dissolutions of mixtures of differently sized particles. This problem needs to be solved if batch dissolutions are to play their part in the proposed amelioration of global warming and associate...... hiện toàn bộ
Geomicrobiology of Blood Falls: An Iron-Rich Saline Discharge at the Terminus of the Taylor Glacier, Antarctica
Aquatic Geochemistry - Tập 10 - Trang 199-220 - 2004
Jill A. Mikucki, Christine M. Foreman, Birgit Sattler, W. Berry Lyons, John C. Priscu
Blood Falls, a saline subglacial discharge from the Taylor Glacier, Antarctica provides an example of the diverse physical and chemical niches available for life in the polar desert of the McMurdo Dry Valleys. Geochemical analysis of Blood Falls outflow resembles concentrated seawater remnant from the Pliocene intrusion of marine waters combined with products of weathering. The result is an iron-r...... hiện toàn bộ
Light-Induced Redox Cycling of Iron: Roles for CO2 Uptake and Release by Aquatic Ecosystems
Aquatic Geochemistry - Tập 21 - Trang 65-80 - 2015
Barbara Sulzberger
The light-induced redox cycling of iron plays an important role for the formation of iron species that are available to phytoplankton. In aquatic ecosystems, siderophore-type ligands are likely to be involved in the formation of bioavailable iron via photolysis of both solution and surface Fe(III) complexes. Atmospheric waters are important “reactors” for the formation of potentially bioavailable ...... hiện toàn bộ
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