Los aportes de aerosoles afectan las propiedades ópticas de la materia orgánica disuelta en las aguas costeras del Mediterráneo Noroccidental

Autores/as

  • E. Denisse Sánchez-Pérez Sorbonne Universités, UPMC Univ. Paris 06 - Institut de Ciències del Mar, CSIC
  • Isabel Marín Institut de Ciències del Mar, CSIC
  • Sdena Nunes Institut de Ciències del Mar, CSIC
  • Fran L. Aparicio Institut de Ciències del Mar, CSIC
  • Laura Fernández-González Institut de Ciències del Mar, CSIC
  • Francesc Peters Institut de Ciències del Mar, CSIC
  • Mireille Pujo-Pay Sorbonne Universités, UPMC Univ. Paris 06 - CNRS
  • Pascal Conan Sorbonne Universités, UPMC Univ. Paris 06 - CNRS
  • Cèlia Marrasé Institut de Ciències del Mar, CSIC

DOI:

https://doi.org/10.3989/scimar.04318.20B

Palabras clave:

FDOM, deposición de aerosoles, DOC, mar Mediterráneo

Resumen


Los aportes atmosféricos de nutrientes orgánicos e inorgánicos al océano son importantes ya que pueden aumentar la producción biológica en aguas superficiales, especialmente en las zonas oligotróficas como el Mediterráneo. El litoral del Mediterráneo está particularmente expuesto a aportes de origen antropogénico y a deposiciones de polvo sahariano de forma más o menos regular. Durante las últimas décadas los estudios experimentales se han dedicado, sobre todo, a examinar el efecto de la entrada de nutrientes inorgánicos atmosféricos sobre la actividad microbiana. En este estudio, se realizaron experimentos con comunidades microbianas procedentes de dos zonas del Mediterráneo noroccidental. Se evaluaron los cambios en la calidad y cantidad de la materia orgánica disuelta debido a aportes atmosféricos de distinto origen y sus posteriores transformaciones mediadas por actividades microbianas. En ambos experimentos las sustancias orgánicas fluorescentes y el rendimiento cuántico de fluorescencia aumentaron después de la adición de material atmosférico. En general, estos cambios en la calidad de la materia orgánica no afectaron significativamente a los organismos procariotas. El carácter recalcitrante de la materia orgánica disuelta fluorescente (FDOM) contenida en los aerosoles se confirmó ya que la utilización de compuestos cromóforos durante el período experimental fue insignificante. Los resultados obtenidos se contextualizan en relación con una serie temporal de dos años de datos adquiridos de deposición atmosférica y análisis de agua superficial costera. La variabilidad temporal de estas dos variables mostró que tanto los aportes saharianos como antropogénicos provocaron cambios en la calidad de la materia orgánica disuelta en aguas superficiales, incrementando la fracción fluorescente. Éste aumento resultó ser mayor durante eventos de polvo sahariano que en ausencia de ellos.

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Citas

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Publicado

2016-12-30

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1.
Sánchez-Pérez ED, Marín I, Nunes S, Aparicio FL, Fernández-González L, Peters F, Pujo-Pay M, Conan P, Marrasé C. Los aportes de aerosoles afectan las propiedades ópticas de la materia orgánica disuelta en las aguas costeras del Mediterráneo Noroccidental. Sci. mar. [Internet]. 30 de diciembre de 2016 [citado 22 de julio de 2024];80(4):437-46. Disponible en: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1680

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Vol. 80 Núm. 4 (2016)

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