Dandonneau Yves auteur aut IRD Le Bouteiller Aubert auteur aut IRD text journalArticle eng text/pdf reformatted digital access A system (LET GO) is described that enables measurements of primary production at sea after in situ incubation, with 14C being injected at depth immediately after enclosure of the sample. Each incubation cell, about 200 ml, is made of two transparent plexiglass cups facing each other. Mechanical energy to operate the system is provided by the tension of the nylon line between the drifting buoy, which holds the experimental equipment, and a weight at the bottom : when the line is strained, the two cups enclose the water sample, and the 14C is delivered by a syringe. Absence of metallic or rubber parts ensures that toxicity effects are minimized and that reliable results can be expected. Furthermore, in situ incubations can start 1 or 2 min after arrival on station, leaving the research vessel and winches available for other tasks. These points make it possible to make in situ 14C incubations during most oceanographic cruises and to increase greatly the acquisition rate of primary production data. The LET GO device has been tested in parallel with the conventional technique. Both techniques showed similar vertical patterns. Carbon fixation measured with the LET GO, however, was greater by a factor 1.3. (Résumé d'auteur) specialized PRODUCTION PRIMAIRE APPAREIL DE MESURE TECHNIQUE ANALYSE DE DONNEES INCUBATION SYSTEME LET GO NOUVELLE CALEDONIE 032TECHNO 39 5 795-803 1992 0146-6291 https://www.documentation.ird.fr/hor/fdi:39868 0146-6291 [F B39868] https://www.documentation.ird.fr/hor/fdi:39868 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/39868.pdf IRD - Base Horizon / Pleins textes 1994-08-05 2015-07-02 fdi:39868 fre