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Does a general relationship exist between fluorescent dissolved organic matter and microbial respiration?-The case of the dark equatorial Atlantic Ocean

Authorsde la Fuente, P. ; Marrasé, Cèlia ; Canepa, Antonio ; Álvarez-Salgado, Xosé Antón ; Gasser, Marc ; Fajar, Noelia ; Romera-Castillo, Cristina ; Pelegrí, Josep Lluís
KeywordsWater masses
Fluorescent dissolved organic matter
Equatorial Atlantic Ocean
Issue Date2014
CitationDeep Sea Research - Part I - Oceanographic Research Papers 89: 44-55 (2014)
AbstractThe distributions of humic-like fluorescent dissolved organic matter (at excitation/emission wavelengths of 340 nm/440 nm, F(340/440)) and apparent oxygen utilization (AOU) are determined from water samples taken at 27 stations along 7.5°N, in the equatorial Atlantic Ocean. The relationship between F(340/440) and AOU is evaluated. The influence of water mass mixing is removed through multiple regressions of both F(340/440) and AOU with salinity and temperature for the ocean interior. A general and significant relationship between the residuals of F(340/440) and AOU is found for the entire water column deeper than 200 m (R2=0.79, n=360, p-value <0.001), endorsing the idea that changes in fluorescence intensity are directly related to in situ oxidation of organic matter by microbial activity in the dark equatorial Atlantic Ocean. In addition, we analyse and discuss the relationships between the residuals of F(340/440) and AOU for all individual water masses
Description12 páginas, 9 figuras, 2 tablas
Publisher version (URL)http://dx.doi.org/10.1016/j.dsr.2014.03.007
Appears in Collections:(IIM) Artículos
(ICM) Artículos
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