Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/316437
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Water mass age and ageing driving chromophoric dissolved organic matter in the dark global ocean |
Autor: | Catalá, Teresa S. CSIC ORCID; Reche, Isabel; Álvarez-Rodríguez, Marta CSIC ORCID; Khatiwala, S.; Guallart, Elisa; Benítez-Barrios, Verónica María; Fuentes-Lema, A.; Romera-Castillo, Cristina CSIC ORCID; Nieto-Cid, Mar CSIC ORCID; Pelejero, E.; Fraile-Nuez, Eugenio; Ortega-Retuerta, Eva; Marrasé, Cèlia CSIC ORCID; Álvarez-Salgado, Xosé Antón CSIC ORCID | Palabras clave: | Centro Oceanográfico de A Coruña Medio Marino water mass age chromophoric Dissolved organic matter dark global ocean |
Fecha de publicación: | 2-jun-2015 | Citación: | Global Biogeochemical Cycles, 29. 2015: 1-18 | Resumen: | The omnipresence of chromophoric dissolved organic matter (CDOM) in the open ocean enables its use as a tracer for biochemical processes throughout the global overturning circulation. We made an inventory of CDOM optical properties, ideal water age (τ), and apparent oxygen utilization (AOU) along the Atlantic, Indian, and Pacific Ocean waters sampled during the Malaspina 2010 expedition. A water mass analysis was applied to obtain intrinsic, hereinafter archetypal, values of τ, AOU, oxygen utilization rate (OUR), and CDOM absorption coefficients, spectral slopes and quantum yield for each one of the 22 water types intercepted during this circumnavigation. Archetypal values of AOU and OUR have been used to trace the differential influence of water mass aging and aging rates, respectively, on CDOM variables. Whereas the absorption coefficient at 325nm (a325) and the fluorescence quantum yield at 340nm (Φ340) increased, the spectral slope over the wavelength range 275–295nm (S275–295) and the ratio of spectral slopes over the ranges 275–295nm and 350–400nm (SR) decreased significantly with water mass aging (AOU). Combination of the slope of the linear regression between archetypal AOU and a325 with the estimated global OUR allowed us to obtain a CDOM turnover time of 634 ± 120 years, which exceeds the flushing time of the dark ocean (>200 m) by 46%. This positive relationship supports the assumption of in situ production and accumulation of CDOM as a by-product of microbial metabolism as water masses turn older. Furthermore, our data evidence that global-scale CDOM quantity (a325) is more dependent on aging (AOU), whereas CDOM quality (S275–295, SR, Φ340) is more dependent on aging rate (OUR). | Descripción: | Research article | URI: | http://hdl.handle.net/10261/316437 | DOI: | 10.1002/2014GB005048 | ISSN: | 0886-6236 |
Aparece en las colecciones: | (IEO) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Catala et al_GBC_2015.pdf | 1,9 MB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
48
checked on 18-abr-2024
WEB OF SCIENCETM
Citations
46
checked on 22-feb-2024
Page view(s)
36
checked on 23-abr-2024
Download(s)
22
checked on 23-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Este item está licenciado bajo una Licencia Creative Commons