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| Trull, Tw; Bray, Sg; Manganini, Sj; Honjo, S; Francois, R. |
| Sediment trap moorings were deployed from September 21, 1997 through February 21, 1998 at three locations south of Australia along 140degreesE: at similar to47degreesS in the central Subantarctic Zone (SAZ) with traps at 1060, 2050, and 3850 m depth, at similar to51degreesS in the Subantarctic Front with one trap at 3080 m, and at similar to54degreesS in the Polar Frontal Zone (PFZ) with traps at 830 and 1580 m. Particle fluxes were high at all the sites (18-32 g m(-2) yr(-1) total mass and 0.5-1.4 g organic carbon m(-2) yr(-1) at similar to1000 m, assuming minimal flux outside the sampled summer period). These values are similar to other Southern Ocean results and to the median estimated for the global ocean by Lampitt and Antia [1997], and emphasize that... |
| Tipo: Text |
Palavras-chave: Carbon cycling; Global Change: Biogeochemical processes; Oceanography: Biological and Chemical: Biogeochemical cycles; Oceanography: General. |
| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/00221/33211/31697.pdf |
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| Findlay, Helen S.; Gibson, Georgina; Kedra, Monika; Morata, Nathalie; Orchowska, Monika; Pavlov, Alexey K.; Reigstad, Marit; Silyakova, Anna; Tremblay, Jean-eric; Walczowski, Waldemar; Weydmann, Agata; Logvinova, Christie. |
| The Arctic Ocean is one of the fastest changing oceans, plays an important role in global carbon cycling and yet is a particularly challenging ocean to study. Hence, observations tend to be relatively sparse in both space and time. How the Arctic functions, geophysically, but also ecologically, can have significant consequences for the internal cycling of carbon, and subsequently influence carbon export, atmospheric CO2 uptake and food chain productivity. Here we assess the major carbon pools and associated processes, specifically summarizing the current knowledge of each of these processes in terms of data availability and ranges of rates and values for four geophysical Arctic Ocean domains originally described by Carmack & Wassmann (2006): inflow... |
| Tipo: Text |
Palavras-chave: Sea ice; Climate change; Ecosystem function; Carbon cycling. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00617/72889/71907.pdf |
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| Skinner, L.; Mccave, I. N.; Carter, L.; Fallon, S.; Scrivner, A. E.; Primeau, F.. |
| It has been proposed that the ventilation of the deep Pacific carbon pool was not significantly reduced during the last glacial period, posing a problem for canonical theories of glacial-interglacial CO2 change. However, using radiocarbon dates of marine tephra deposited off New Zealand, we show that deep(>2000 m) and shallow sub-surface ocean-atmosphere C-14 age offsets (i.e. 'reservoir-' or 'ventilation' ages) in the southwest Pacific increased by similar to 1089 and 337 yrs respectively, reaching similar to 2689 and similar to 1037 yrs during the late glacial. A comparison with other radiocarbon data from the southern high-latitudes suggests that broadly similar changes were experienced right across the Southern Ocean. If, like today, the Southern... |
| Tipo: Text |
Palavras-chave: Radiocarbon; Ocean ventilation; Carbon cycling; Palaeoceanography. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00352/46279/46041.pdf |
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| Xue, Liang; Gao, Libao; Cai, Wei-jun; Yu, Weidong; Wei, Meng. |
| Using observational data collected south of Tasmania during 14 austral summer cruises during 1993-2011, we examined the response of sea surface fugacity of carbon dioxide (fCO(2)) to the Southern Annular Mode (SAM) shift, which occurred around 2000. In the southern part of the Southern Ocean (SO) or the Polar Zone (PZ) and the Polar Frontal Zone (PFZ), fCO(2) increased faster at the sea surface than in the atmosphere before the SAM shift, but not after the shift. In the northern part of the SO or the Subantarctic Zone (SAZ), however, surface fCO(2) increased faster than atmospheric fCO(2) both before and after the shift. The SAM shift had an important influence on the surface fCO(2) trend in the PZ and PFZ but not in the SAZ, which we attribute to... |
| Tipo: Text |
Palavras-chave: Southern Ocean; Southern Annular Mode shift; Carbon cycling; Upwelling; South of Tasmania. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00292/40369/38947.pdf |
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| Salemi,Luiz Felippe; Lins,Silvia Rafaela Machado; Ravagnani,Elizabethe de Campos; Magioli,Marcelo; Martinez,Melissa Gaste; Guerra,Fernando; Vidas,Natassia Bonini; Fransozi,Aline; Ferraz,Silvio Frosini de Barros; Martinelli,Luiz Antonio. |
| Abstract In this article, by using carbon stable isotopes, we assessed the past and present land use influences that riparian areas are subject within agricultural landscapes. Emphasis is given to the understanding of the effects of the 2012 Brazilian Forest Act on such areas. We selected five riparian areas within a highly C4 dominated agricultural landscape. Three of them had 30 meters native riparian forest buffer (NRFB) and two of them had 8 meter and no NRFB. We used three 100 meter-transects located 5, 15 and 30 meters relative to stream channel to obtain soil samples (0 - 10 cm). All riparian areas presented soil carbon isotopic signatures that are not C3 (native forests) irrespective of having or not 30 meters NRFB. Two cases presenting less than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Watershed; Soil degradation; Organic matter; Sediment; Carbon cycling. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000200210 |
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