@misc{10481/57398,
year = {2019},
month = {6},
url = {http://hdl.handle.net/10481/57398},
abstract = {The global distribution of chromophoric dissolved organic matter (CDOM) in the euphotic
 layer of the Atlantic, Indian, and Pacific oceans (between 35 N and 40 S) was
 analyzed by absorption spectroscopy during the Malaspina 2010 circumnavigation.
 Absorption coefficients at 254 nm (a254) and 325 nm (a325), indices (a254/a365) and
 spectral slopes (between 275 and 295 nm, S275--295) were calculated from the
 dissolved fraction of the UV absorption spectra to describe the amount and quality
 of CDOM. Generalized Additive Models (GAMs) were applied to evaluate the relevance
 of physical and biogeochemical drivers for the variability of CDOM. Besides the low
 CDOM values, a first division of our data following the Longhurst’s biogeographic
 classification showed significant differences in CDOM levels among provinces. The
 lowest values of a254 and a325 were found in the oligotrophic gyres, particularly in the
 Indian Ocean, and the highest in the upwelling areas, particularly in the Equatorial Pacific.
 Opposite distributions were obtained for S275--295 and a254/a365, indicative of higher
 photobleaching in the gyres. The
 GAM analysis also shows that a254/a365 and S275--295 exhibited inverse relationships with solar radiation, indicating that the biological production of CDOM counteracts
 photodegradation as solar radiation increases. In summary, whereas photobleaching
 dictates the vertical distribution of CDOM, Chl a explains the CDOM differences
 among the photic layer of the tropical and subtropical ocean provinces visited during
 the circumnavigation.},
organization = {This study was funded by the Ingenio-Consolider project
Malaspina 2010 Circumnavigation Expedition (MICINN
CSD2008-00077). FI and JO were supported by a fellowship from
the “Junta para la Ampliación de Estudios” (JAE-preDOC and
JAE-postDOC programs 2011, respectively) from the CSIC.},
publisher = {Frontiers Media},
keywords = {chromophoric dissolved organic matter},
keywords = {Absorption spectroscopy},
keywords = {euphotic layer},
keywords = {tropical and subtropical ocean},
keywords = {biogeographic provinces},
title = {Patterns and Drivers of UV Absorbing Chromophoric Dissolved Organic Matter in the Euphotic Layer of the Open Ocean},
doi = {10.3389/fmars.2019.00320},
author = {Iuculano, Francesca and Alverez Salgado, Xose Anton and Otero, Jaime and Serrano Catalá, Teresa and Sobrino, Cristina and Duarte, Carlos and Agusti, Susana},
}