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  • 1
    Publication Date: 2021-05-19
    Description: Se realizaron cinco muestreos entre enero de 2007 y junio de 2008 a la zona costera del municipio Playa, con el fin de evaluar los contenidos de los compuestos del ciclo del carbono. Los parámetros estudiados en la matriz agua fueron carbón orgánico, pH, alcalinidad total, alcalinidad al carbonato, dióxido de carbono total, dióxido de carbono libre, presión parcial de CO2, y contenidos de bicarbonato y carbonato. Los compuestos de carbono orgánico e inorgánico tuvieron una distribución muy heterogénea, los valores de pH (8,24±0,22) y alcalinidad total (2523±119 μmol/kg) indican que el área tiene un comportamiento alcalino, estos montos fueron similares a los encontrados en aguas de la plataforma marina cubanos y superiores a los consignados para el ambiente oceánico. El bicarbonato constituye el 77 % del carbono inorgánico total.
    Description: Five samplings were carried out between January 2007 and June 2008 in the coastal zone of Playa Municipality, with the purpose of evaluating the contents of carbon cycle compounds. The studied water matrix parameters were organic carbon, pH, total alkalinity, carbonate alkalinity, total carbon dioxide, free carbon dioxide, partial CO2 pressure, and bicarbonate and carbonate contents. Organic and inorganic carbon compounds presented a very heterogeneous distribution; pH values (8,24±0,22) and total alkalinity (2523±119 μmol/kg) indicate that the area has an alkaline behavior. These values were similar to those found in waters of the Cuban marine shelf, and higher than those registered for the oceanic environment. Bicarbonate ions constitute 77% of the total inorganic carbon.
    Description: Published
    Description: Cambio climático, Climate Change
    Keywords: Carbon dioxide ; Alkalinity ; Carbon cycle ; Carbon dioxide ; Alkalinity ; Carbon cycle
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 2
    Publication Date: 2022-05-26
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Nature Communications 9 (2018): 121, doi:10.1038/s41467-017-02504-1.
    Description: Sediments in deep ocean trenches may contain crucial information on past earthquake history and constitute important sites of carbon burial. Here we present 14C data on bulk organic carbon (OC) and its thermal decomposition fractions produced by ramped pyrolysis/oxidation for a core retrieved from the 〉7.5 km-deep Japan Trench. High-resolution 14C measurements, coupled with distinctive thermogram characteristics of OC, reveal hemipelagic sedimentation interrupted by episodic deposition of pre-aged OC in the trench. Low δ13C values and diverse 14C ages of thermal fractions imply that the latter material originates from the adjacent margin, and the co-occurrence of pre-aged OC with intervals corresponding to known earthquake events implies tectonically triggered, gravity-flow-driven supply. We show that 14C ages of thermal fractions can yield valuable chronological constraints on sedimentary sequences. Our findings shed new light on links between tectonically driven sedimentological processes and marine carbon cycling, with implications for carbon dynamics in hadal environments.
    Description: This study is supported by Doc.Mobility Fellowship (P1EZP2_159064) (R.B.) from the Swiss National Science Foundation (SNSF). This work is also supported by SNF “CAPS-LOCK” project 200021_140850 (T.I.E.), by SNSF grant (133481) (M.S.), and Austrian Science Foundation (P 29678-N28) (M.S.).
    Keywords: Carbon cycle ; Sedimentology
    Repository Name: Woods Hole Open Access Server
    Type: Article
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