Vertical chemical profiles collected across haloclines in the water column of the Ox Bel Ha cave network within the coastal aquifer of the Yucatan Peninsula in January 2015 and January 2016

Online link https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P9N4H6Y4/CenoteBang_OPP-gechem-data_2015-2016_meta.faq.html
Description Natural cave passages penetrating a coastal aquifer in the Yucatan Peninsula (Mexico) were accessed to test the hypothesis that chemoclines associated with salinity gradients (haloclines) within the flooded cave networks of the karst subterranean estuary are sites of methane oxidation. Two field trips were carried out to the fully-submerged cave system located 6.6 km inland from the coastline in January 2015 and January 2016. Vertical chemical profiles across the water column haloclines were obtained using the OctoPiPi (OPP), a high-resolution water sampler built by the U.S. Geological Survey (USGS). The sampling efforts resulted in cm-scale profiles of major ions (e.g., chloride and sulfate), as well as concentrations and stable carbon isotopic values of methane, dissolved organic carbon (DOC), and dissolved inorganic carbon (DIC). Field activities were carried out by the USGS Coastal and Marine Geology Program in conjunction with Texas A&M University at Galveston [More]
Originators Brankovits, David and Pohlman, John W.
Field activities 2016-003-FA

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Browse graphic of the conceptual model of the karst subterranean estuary in an unconfined coastal aquifer setting (top). Mixing between freshwater and marine-derived saline groundwater occurs within the aquifer’s porous geologic setting, including its sinkholes and cave conduits. Mixing zones were accessed through flooded cave networks to obtain high-resolution vertical profiles of chemical parameters (bottom box). Samples were collected with 12-cm spacing in (a) January 2015 and (b) January 2016, as well as with the 2.5-cm spacing (c) in January 2016. The blue line is the sulfate to chloride ratio (0.0515) of the regional seawater.
Browse graphic of the conceptual model of the karst subterranean estuary in an unconfined coastal aquifer setting (top). Mixing between freshwater and marine-derived saline groundwater occurs within the aquifer’s porous geologic setting, including its sinkholes and cave conduits. Mixing zones were accessed through flooded cave networks to obtain high-resolution vertical profiles of chemical parameters (bottom box). Samples were collected with 12-cm spacing in (a) January 2015 and (b) January 2016, as well as with the 2.5-cm spacing (c) in January 2016. The blue line is the sulfate to chloride ratio (0.0515) of the regional seawater.