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Inorganic carbon and biological oceanography above a shallow oxygen minimum in the entrance to the Gulf of California in the Mexican Pacific

2010; Wiley; Volume: 55; Issue: 2 Linguagem: Inglês

10.4319/lo.2009.55.2.0481

1939-5604

Helmut Maske, Ramón Cajal Medrano, Armando Trasviña Castro, Alejandrina Jiménez Mercado, Cesar O. Almeda Jauregui, Gilberto Gaxiola Castro, José L. Ochoa,

Marine Biology and Ecology Research

Limnology and OceanographyVolume 55, Issue 2 p. 481-491 ArticleFree Access Inorganic carbon and biological oceanography above a shallow oxygen minimum in the entrance to the Gulf of California in the Mexican Pacific Helmut Maske, Corresponding Author Helmut Maske Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoCorresponding author: [email protected]Search for more papers by this authorRamón Cajal Medrano, Ramón Cajal Medrano Universidad Autónoma de Baja California, Facultad de Ciencias Marinas, Ensenada, Baja California, MexicoSearch for more papers by this authorArmando Trasviña Castro, Armando Trasviña Castro Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoSearch for more papers by this authorAlejandrina Jiménez Mercado, Alejandrina Jiménez Mercado Universidad Autónoma de Baja California, Facultad de Ciencias Marinas, Ensenada, Baja California, MexicoDeceased February 2008Search for more papers by this authorCesar O. Almeda Jauregui, Cesar O. Almeda Jauregui Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoSearch for more papers by this authorGilberto Gaxiola Castro, Gilberto Gaxiola Castro Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoSearch for more papers by this authorJosé Ochoa, José Ochoa Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoSearch for more papers by this author Helmut Maske, Corresponding Author Helmut Maske Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoCorresponding author: [email protected]Search for more papers by this authorRamón Cajal Medrano, Ramón Cajal Medrano Universidad Autónoma de Baja California, Facultad de Ciencias Marinas, Ensenada, Baja California, MexicoSearch for more papers by this authorArmando Trasviña Castro, Armando Trasviña Castro Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoSearch for more papers by this authorAlejandrina Jiménez Mercado, Alejandrina Jiménez Mercado Universidad Autónoma de Baja California, Facultad de Ciencias Marinas, Ensenada, Baja California, MexicoDeceased February 2008Search for more papers by this authorCesar O. Almeda Jauregui, Cesar O. Almeda Jauregui Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoSearch for more papers by this authorGilberto Gaxiola Castro, Gilberto Gaxiola Castro Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoSearch for more papers by this authorJosé Ochoa, José Ochoa Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, MexicoSearch for more papers by this author First published: 30 December 2009 https://doi.org/10.4319/lo.2010.55.2.0481Citations: 10 AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract The eastern Pacific intermediate oxygen minimum layer (OML) is particularly well-developed and shoals close to the Mexican coast. We obtained hydrographic profiles including oxygen concentration [O], measured dissolved inorganic carbon (DIC), continuous surface pCO2 in water and air and took biological data south of the Gulf of California in March 2005. The core of the OML, with close to zero [O] was centered around 475 m with a thickness of the core varying between 80 m and 700 m and the upper limit of the core ranging from 500 m to 80 m. At the surface [O] was close to air-saturation and showed no relation with the depth of the OML contrary to DIC and pCO2 concentrations. Below 50-m depth the changes in DIC and Apparent Oxygen Utilization (AOU) yielding a molar ratio of δDIC = 0.79 x δAOU. When the OML shoaled, surface temperature, chlorophyll concentration [CHL], and depth-integrated zooplankton increased, resulting in positive correlations among plankton biomass, pCO2, and DIC in surface waters. When [CHL] is recalculated as particulate organic carbon (POC), a linear relationship with the sum of DIC and POC is observed as expected for concomitant transport of DIC and inorganic nutrients supporting POC formation. Neglecting ventilation of carbon into the atmosphere and the production of dissolved organic carbon, the results suggested that ~16% of the carbon transported up from the OML was present in surface waters in the form of POC and the rest in inorganic form. Citing Literature Volume55, Issue2March 2010Pages 481-491 RelatedInformation