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| Cubillos, J. C.; Wright, S. W.; Nash, G.; De Salas, M. F.; Griffiths, B.; Tilbrook, B.; Poisson, A.; Hallegraeff, G. M.. |
| We conducted a scanning electron microscopic survey of morphological variations in the calcareous nanoplankton species Emiliania huxleyi in Southern Ocean surface water samples collected along a transect from 43 to 64 degrees S and 141 to 145 degrees E during November 2001, October to February 2002/2003, 2003/2004, 2004/2005 and 2005/2006. The results were compared with historical data from a similar transect occupied in December to January 1983/1984 and January to February 1994 and 1995. While E. huxleyi was absent or extremely sparse (0.1 to 1 cells ml(-1)) south of 60 degrees S in 1983/1984 and 1994/1995, this species was consistently present at about 100 cells ml(-1) between 60 and 65 degrees S during 2002 to 2006. The extended geographic range and/or... |
| Tipo: Text |
Palavras-chave: Southern Ocean; Emiliania huxleyi; Calcite saturation state; Ocean acidification. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00236/34735/33191.pdf |
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| Terrats, L.; Claustre, H.; Cornec, M.; Mangin, A.; Neukermans, G.. |
| Coccolithophores (calcifying phytoplankton) form extensive blooms in temperate and subpolar oceans as evidenced from ocean‐color satellites. This study examines the potential to detect coccolithophore blooms with BioGeoChemical‐Argo (BGC‐Argo) floats, autonomous ocean profilers equipped with bio‐optical and physicochemical sensors. We first matched float data to ocean‐color satellite data of calcite concentration to select floats that sampled coccolithophore blooms. We identified two floats in the Southern Ocean, which measured the particulate beam attenuation coefficient (cp) in addition to two core BGC‐Argo variables, Chlorophyll‐a concentration ([Chl‐a]) and the particle backscattering coefficient (bbp). We show that coccolithophore blooms can be... |
| Tipo: Text |
Palavras-chave: Coccolithophores; Emiliania huxleyi; Bloom detection; BGC‐Argo floats; Bio‐optics; Global ocean. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00660/77209/78652.pdf |
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