Water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean
18 páginas, 6 figuras, 1 tabla.-- T. S. Catalá ... et al.
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American Geophysical Union
2015
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dig-icm-es-10261-1242112019-03-26T10:11:56Z Water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean Catalá, Teresa S. Fernández-Guallart, E. Romera-Castillo, Cristina Nieto-Cid, Mar Pelejero, Carles Ortega-Retuerta, E. Marrasé, Cèlia Álvarez-Salgado, Xosé Antón 18 páginas, 6 figuras, 1 tabla.-- T. S. Catalá ... et al. 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 325 nm (a325) and the fluorescence quantum yield at 340 nm (Φ340) increased, the spectral slope over the wavelength range 275–295 nm (S275–295) and the ratio of spectral slopes over the ranges 275–295 nm and 350–400 nm (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) This study was financed by the Malaspina 2010 circumnavigation expedition (grant CSD2008–00077); T.S.C acknowledges funding through a predoctoral fellowship (reference AP2009-2138) from the Ministerio de Educación, Cultura y Deporte. C.R-C. acknowledges funding through a Beatriu de Pinos postdoctoral fellowship from the Generalitat de Catalunya. M.N.-C. was funded by the CSIC Program “Junta para la Ampliación de Estudios” cofinanced by the ESF. S.K. was supported by U.S. NSF grant OCE-1060804. E.F.G. was funded through a JAE-Pre grant from CSIC and the European Social Fund. C. M. was supported by DOREMI(CTM2012-34294) funded by the Spanish Ministry of Economy and Competitiveness. Peer reviewed 2015-10-30T12:37:24Z 2015-10-30T12:37:24Z 2015 artículo http://purl.org/coar/resource_type/c_6501 Global Biogeochemical Cycles 29(7): 917-934 (2015) 0886-6236 http://hdl.handle.net/10261/124211 10.1002/2014GB005048 1944-9224 en Publisher's version http://dx.doi.org/10.1002/2014GB005048 Sí open American Geophysical Union |
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18 páginas, 6 figuras, 1 tabla.-- T. S. Catalá ... et al. |
| format |
artículo |
| author |
Catalá, Teresa S. Fernández-Guallart, E. Romera-Castillo, Cristina Nieto-Cid, Mar Pelejero, Carles Ortega-Retuerta, E. Marrasé, Cèlia Álvarez-Salgado, Xosé Antón |
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Catalá, Teresa S. Fernández-Guallart, E. Romera-Castillo, Cristina Nieto-Cid, Mar Pelejero, Carles Ortega-Retuerta, E. Marrasé, Cèlia Álvarez-Salgado, Xosé Antón Water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean |
| author_facet |
Catalá, Teresa S. Fernández-Guallart, E. Romera-Castillo, Cristina Nieto-Cid, Mar Pelejero, Carles Ortega-Retuerta, E. Marrasé, Cèlia Álvarez-Salgado, Xosé Antón |
| author_sort |
Catalá, Teresa S. |
| title |
Water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean |
| title_short |
Water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean |
| title_full |
Water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean |
| title_fullStr |
Water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean |
| title_full_unstemmed |
Water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean |
| title_sort |
water mass age and aging driving chromophoric dissolved organic matter in the dark global ocean |
| publisher |
American Geophysical Union |
| publishDate |
2015 |
| url |
http://hdl.handle.net/10261/124211 |
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