Jeudi 28 janvier - Robotic biogeochemical observations in the Open Ocean
de 11:00 à 12:00
|Où ?||Salle Lyot|
Hervé Claustre, Laboratoire d'Océanographie de Villefranche-sur-Mer
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Hervé Claustre, Laboratoire d'Océanographie de Villefranche
Titre : Robotic biogeochemical observations in the Open Ocean
At the end of 2007, the international Argo program reached its initial goal of deploying more than 3000 autonomous profiling floats worldwide. They are now collecting temperature and salinity profiles every ten days (today 95% of CTD profiles are acquired by Argo floats). With a certain time lag, biogeochemical oceanography is following the footsteps of physical oceanography and is undertaking a similar technological breakthrough with the implementation of low-power biogeochemical sensors (e.g. Chla, O2, NO3, irradiance…) on these robotic platforms. Moving from the era of a dramatically under sampled ocean, these new autonomous observations open the perspective to radically increase the spatial and temporal resolutions of biogeochemical property measurements. As a consequence, a better understanding of biogeochemical processes is expected, as well as a reduction in uncertainties associated with the estimations of chemical element fluxes. The potential exploratory dimension of these robotic observations also needs to be acknowledged, especially in remote areas or for harsh sea state conditions. In this talk, I will first introduce the technology of the so-called “Bio-Argo” floats, the mature platforms of today as well as their potential improvement in the near future. I will then illustrate, through examples from literature and from research conducted by our laboratory, how Bio-Argo technology is able to help deepen our understanding of biogeochemical cycles. I will finally conclude with the perspective of developing an international Bio-Argo program that, like Argo, should provide real-time and delayed mode quality controlled data to both the operational as well as scientific communities.