1 / 13

Juan Carlos Miquel & Beat Gasser IAEA Marine Environment Laboratory Monaco

Carbon export in contrasting environments in the SE Pacific: a dual approach using drifting traps and 238 U: 234 Th disequilibria. Juan Carlos Miquel & Beat Gasser IAEA Marine Environment Laboratory Monaco. Figure 1 : Location of stations and transect during the BIOSOPE cruise

lan
Download Presentation

Juan Carlos Miquel & Beat Gasser IAEA Marine Environment Laboratory Monaco

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Carbon export in contrasting environments in the SE Pacific: a dual approach using drifting traps and 238U:234Th disequilibria Juan Carlos Miquel & Beat Gasser IAEA Marine Environment Laboratory Monaco

  2. Figure 1 : Location of stations and transect during the BIOSOPE cruise short stations (6 hours) long stations at a fixed location (~ 3 days) studies of specific sites (~ 6 jours)

  3. Trap sampling: 9 stations 3 sta:48,24,48 hrs 3 days 3 days 3 days 3 sta:48,24,48 hrs Figure 1 : Location of stations and transect during the BIOSOPE cruise short stations (6 hours) long stations at a fixed location (~ 3 days) studies of specific sites (~ 6 jours)

  4. Trap sampling • Drifting array • Two depth: 150, 300 m • Samples preserved: formaldehyde • Trap model: Technicap PPS3/PPS5 • Time resolution: 24 hrs Analysis • Th-234,  counting • C/N, C.org, C.inorg • Pigments HPLC (LOV) • Lipid biomarkers • Opal (COM)

  5. If: Flux PPS3 PPS5 (mg m-2 d-1) (mg d-1) (mg d-1) 5-10 0.75-1.25 5-10 100-200 12.5-25 100-200 • 62.5 500

  6. SAP sampling: 9 profiles Figure 1 : Location of stations and transect during the BIOSOPE cruise short stations (6 hours) long stations at a fixed location (~ 3 days) studies of specific sites (~ 6 jours)

  7. particles > 70 m particles > 0.7 m dissolved, cartridges A & B

  8. 238U (4.49 109 y) 234U (2.48 105 y) 234Pa (1.18 mn) 234Th (24.1 d) 230Th (8.0 104 y) 226Ra (1622 y) Uranium-238 natural decay series

  9. y = 28.2 x r2 = 0.60

  10. SAP profiles • One hour pumping (min.) • 600-900 l • 10 depths: 2, (25), 50, 75, 100, 125, 150, (175), 200, 300 m • Steady-state modelling Analysis >70 m particles • Th-234,  counting • C.org 0.7-70 m particles • Th-234,  counting • C/N, C.org, C.inorg • Pigments HPLC (LOV) • Lipid biomarkers at 3 depths: 50, 100, 300 m (and/or max. Chl.a) dissolved • Th-234,  counting (sampling for U-238)

More Related