Physical and biogeochemical controls of the carbonate system of the Yucatan Shelf
Por:
Barranco, Linda M., Martín Hernández Ayón J., Pech, Daniel, Enriquez, Cecilia, Herrera, Jorge, Mariño I., Carlos Herguera J.
Publicada:
1 ene 2022
Resumen:
The dynamics and distribution of the carbonate system and the processes that regulate it over the Yucatan Shelf (YS), a region of karst geology and high productivity that is influenced by submarine groundwater discharges (SGDs) and upwelling, were explored with data from two oceanographic cruises. The first oceanographic cruise was conducted in November 2015 during the Nortes season, a period of intense northerly wind activity, and a second cruise was conducted during the rainy season in August/September 2016. Notable biogeochemical differences were present between them. At the surface, Caribbean Surface Water (CSW) predominated over the shelf in both periods. During the Nortes cruise, a surface nearshore-offshore gradient showed high dissolved inorganic carbon (DIC; ~2470 µmol kg-1) and total alkalinity (TA; ~2460 µmol kg-1) values near the coast and average pHTotal and pCO2 values of 7.42 ± 0.10 and 2206 ± 546 µatm, respectively. These geochemical characteristics were attributed to the influence of SGDs, punctuated by relatively low d13CDIC values between -4.18‰ and -2.49‰, which reflects an important oxidation of organic carbon and the dissolution of carbonate minerals. The presence of upwelled water on the eastern side of the YS showed average DIC and pHTotal values of 2260 ± 15 µmol kg-1 and 7.69 ± 0.08, respectively, which were lower than coastal values. During the rainy cruise, the advection of CSW by the Yucatan Current was traced by its thermohaline properties. However, the surface water carbonate system was relatively homogeneous, with average DIC, TA, pHTotal, and pCO2 values of 2047 ± 16 µmol kg-1, 2388 ± 11 µmol kg-1, 8.02 ± 0.02, and 440 ± 27 µatm, respectively. Lastly, the d13CDIC values during this cruise ranged from -1.21‰ to 1.25‰, which suggests that the carbonate system is mainly regulated by organic matter production and respiration. © 2022
Filiaciones:
Barranco, Linda M.:
Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Transpeninsular Tijuana-Ensenada 3917, Fraccionamiento Playitas, CP, Ensenada, Baja California 22860, Mexico
Laboratorio de Biodiversidad Marina y Cambio Climático (BIOMARCCA), El Colegio de La Frontera Sur, Campeche, 24500, Mexico
Univ Autonoma Baja California, Inst Invest Oceanol, Transpeninsular Tijuana Ensenada 3917, Ensenada 22860, Baja California, Mexico
Colegio La Frontera Sur, Lab Biodiversidad Marina & Cambio Clim BIOMARCCA, Campeche 24500, Mexico
Martín Hernández Ayón J.:
Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Transpeninsular Tijuana-Ensenada 3917, Fraccionamiento Playitas, CP, Ensenada, Baja California 22860, Mexico
Pech, Daniel:
Laboratorio de Biodiversidad Marina y Cambio Climático (BIOMARCCA), El Colegio de La Frontera Sur, Campeche, 24500, Mexico
Colegio La Frontera Sur, Lab Biodiversidad Marina & Cambio Clim BIOMARCCA, Campeche 24500, Mexico
Enriquez, Cecilia:
Facultad de Ciencias, UMDI Sisal, Universidad Nacional Autónoma de México, SisalYucatán, Mexico
Escuela Nacional de Estudios Superiores-Mérida, Universidad Nacional Autónoma de México, Carretera Mérida-Tetiz 4.5 Km, Tablaje Catastral 6998, Municipio de Ucú, CPYucatán 97357, Mexico
Univ Nacl Autonoma Mexico, Fac Ciencias, UMDI Sisal, Sisal, Yucatan, Mexico
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super Merida, Tablaje Catastral 6998,Carretera Merida Tetiz 4-5, Municipio De Ucu 97357, Yucatan, Mexico
Herrera, Jorge:
Departamento de Recursos Del Mar, CINVESTAV Mérida. Carretera Antigua a Progreso Km 6, CP, Mérida, Yucatán 97310, Mexico
CINVESTAV Merida, Dept Recursos Mar, Carretera Antiguaa Progreso Km 6, Merida 97310, Yucatan, Mexico
Mariño I.:
Facultad de Ciencias, UMDI Sisal, Universidad Nacional Autónoma de México, SisalYucatán, Mexico
Carlos Herguera J.:
Departamento de Ecología Marina, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana No. 3918, Zona Playitas, CP, Ensenada, BC 22860, Mexico
Ctr Invest Cient & Educ Super Ensenada, Dept Ecol Marina, Carretera Ensenada Tijuana 3918, Ensenada 22860, BC, Mexico
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