Zobrazeno 1 - 10
of 48
pro vyhledávání: '"J. Cavagna"'
Autor:
A. J. Cavagna, F. Fripiat, M. Elskens, P. Mangion, L. Chirurgien, I. Closset, M. Lasbleiz, L. Florez-Leiva, D. Cardinal, K. Leblanc, C. Fernandez, D. Lefèvre, L. Oriol, S. Blain, B. Quéguiner, F. Dehairs
Publikováno v:
Biogeosciences, Vol 12, Iss 21, Pp 6515-6528 (2015)
Although the Southern Ocean is considered a high-nutrient, low-chlorophyll (HNLC) area, massive and recurrent blooms are observed over and downstream of the Kerguelen Plateau. This mosaic of blooms is triggered by a higher iron supply resulting from
Externí odkaz:
https://doaj.org/article/79888a2791ab4bebba71a56c23e453fe
Autor:
F. Planchon, D. Ballas, A.-J. Cavagna, A. R. Bowie, D. Davies, T. Trull, E. C. Laurenceau-Cornec, P. Van Der Merwe, F. Dehairs
Publikováno v:
Biogeosciences, Vol 12, Iss 12, Pp 3831-3848 (2015)
This study examined upper-ocean particulate organic carbon (POC) export using the 234Th approach as part of the second KErguelen Ocean and Plateau compared Study expedition (KEOPS2). Our aim was to characterize the spatial and the temporal variabilit
Externí odkaz:
https://doaj.org/article/1f94a6d06f9948e589e5e46230816e58
Autor:
F. Dehairs, F. Fripiat, A.-J. Cavagna, T. W. Trull, C. Fernandez, D. Davies, A. Roukaerts, D. Fonseca Batista, F. Planchon, M. Elskens
Publikováno v:
Biogeosciences, Vol 12, Iss 5, Pp 1459-1482 (2015)
This paper presents whole water column data for nitrate N, O isotopic composition for the Kerguelen Plateau area and the basin extending east of Heard Island, aiming at understanding the N-cycling in this naturally iron fertilized area that is charac
Externí odkaz:
https://doaj.org/article/91e07c796f424137b737dd9039a085de
Autor:
S. H. M. Jacquet, F. Dehairs, D. Lefèvre, A. J. Cavagna, F. Planchon, U. Christaki, L. Monin, L. André, I. Closset, D. Cardinal
Publikováno v:
Biogeosciences, Vol 12, Iss 6, Pp 1713-1731 (2015)
We report on the zonal variability of mesopelagic particulate organic carbon remineralization and deep carbon transfer potential during the Kerguelen Ocean and Plateau compared Study 2 expedition (KEOPS 2; October–November 2011) in an area of the p
Externí odkaz:
https://doaj.org/article/8871e1616c6347a5ac9c7cf105b3dbb8
Autor:
T. W. Trull, D. M. Davies, F. Dehairs, A.-J. Cavagna, M. Lasbleiz, E. C. Laurenceau-Cornec, F. d'Ovidio, F. Planchon, K. Leblanc, B. Quéguiner, S. Blain
Publikováno v:
Biogeosciences, Vol 12, Iss 4, Pp 1029-1056 (2015)
We examined phytoplankton community responses to natural iron fertilisation at 32 sites over and downstream from the Kerguelen Plateau in the Southern Ocean during the austral spring bloom in October–November 2011. The community structure was estim
Externí odkaz:
https://doaj.org/article/f87893b7016141e79814e45242e8c3e9
Autor:
E. C. Laurenceau-Cornec, T. W. Trull, D. M. Davies, S. G. Bray, J. Doran, F. Planchon, F. Carlotti, M.-P. Jouandet, A.-J. Cavagna, A. M. Waite, S. Blain
Publikováno v:
Biogeosciences, Vol 12, Iss 4, Pp 1007-1027 (2015)
The first KErguelen Ocean and Plateau compared Study (KEOPS1), conducted in the naturally iron-fertilised Kerguelen bloom, demonstrated that fecal material was the main pathway for exporting carbon to the deep ocean during summer (January–February
Externí odkaz:
https://doaj.org/article/402b550670b94cbe944059ac0df609ca
Autor:
I. Closset, M. Lasbleiz, K. Leblanc, B. Quéguiner, A.-J. Cavagna, M. Elskens, J. Navez, D. Cardinal
Publikováno v:
Biogeosciences, Vol 11, Iss 20, Pp 5827-5846 (2014)
A massive diatom bloom is observed each year in the surface waters of the naturally Fe-fertilized Kerguelen Plateau (Southern Ocean). We measured biogenic silica production and dissolution fluxes (ρSi and ρDiss, respectively) in the mixed layer in
Externí odkaz:
https://doaj.org/article/ea8d7b05019d4d66ab3dae87808b7253
Autor:
A.-J. Cavagna, F. Dehairs, S. Bouillon, V. Woule-Ebongué, F. Planchon, B. Delille, I. Bouloubassi
Publikováno v:
Biogeosciences, Vol 10, Iss 4, Pp 2787-2801 (2013)
The combination of concentrations and δ13C signatures of Particulate Organic Carbon (POC) and sterols provides a powerful approach to study ecological and environmental changes in both the modern and ancient ocean. We applied this tool to study the
Externí odkaz:
https://doaj.org/article/2582b62beadd411f8bb62116d2b114c7
Publikováno v:
Biogeosciences, Vol 10, Iss 2, Pp 803-820 (2013)
As part of the GEOTRACES Bonus-GoodHope (BGH) expedition (January–March 2008) in the Atlantic sector of the Southern Ocean, particulate organic carbon (POC) export was examined from the surface to the mesopelagic twilight zone using water column di
Externí odkaz:
https://doaj.org/article/d1a11737917f400fabb0c84865fb3020
Publikováno v:
Biogeosciences, Vol 9, Iss 7, Pp 2443-2457 (2012)
Southern Ocean biogeochemical processes have an impact on global marine primary production and global elemental cycling, e.g. by likely controlling glacial-interglacial pCO2 variation. In this context, the natural silicon isotopic composition (δ30Si
Externí odkaz:
https://doaj.org/article/dafb18f6a2314abaa94fc61090e5bb4f