Presentation is loading. Please wait.

Presentation is loading. Please wait.

NCP ( mmol O 2 m -2 d -1 ) BP (mmol C m 2 d -1 ) NET ECOSYSTEM METABOLISM IN THE NW IBERIAN UPWELLING SYSTEM ON AN ANNUAL CYCLE C.G.Castro, Arbones B,

Similar presentations


Presentation on theme: "NCP ( mmol O 2 m -2 d -1 ) BP (mmol C m 2 d -1 ) NET ECOSYSTEM METABOLISM IN THE NW IBERIAN UPWELLING SYSTEM ON AN ANNUAL CYCLE C.G.Castro, Arbones B,"— Presentation transcript:

1 NCP ( mmol O 2 m -2 d -1 ) BP (mmol C m 2 d -1 ) NET ECOSYSTEM METABOLISM IN THE NW IBERIAN UPWELLING SYSTEM ON AN ANNUAL CYCLE C.G.Castro, Arbones B, Alvarez-Salgado XA, Alonso-Pérez F, Froján M, Zúñiga D, Teixeira IG, and Figueiras FG Instituto de Investigaciones Marinas (CSIC) The 45 th International Liège Colloquium 13 th – 17 th May 2013

2 Aristegui Arístegui et al CAIBEX: Shelf –ocean exchanges in the Canaries- Iberian Large Marine Ecosystem Background

3 Northern boundary of the Canary Current upwelling system Seasonal variation: Upwelling: April to September Downwelling: October to March MONTH Upwelling index ( ) Courtesy of RMS from PML UPWELLING Background Courtesy of RMS from PML DOWNWELLING Upwelling index (10 3 m 3 s -1 Km -1 )

4 E Background High rates of primary production during the upwelling period (2.5 g C m -2 d -1 ), dominated by large – sized diatoms (Varela et al., 1991; Teira et al., 2001; Figueiras et al., 2001; Tilstone et al., 2003) Espinoza et al. 2012

5 Objectives To study the fate of fixed carbon based on direct measurements of gross primary production, pelagic respiration and vertical export of organic matter and explore the linkage between Production / Respiration balance and size structure and composition of the microbial plankton community.

6 Methods Courtesy of RMS from PML SEAWATER SAMPLES for: -Nutrients -Size –fractionated chlorophyll (0.2, 2, & 20 µm) -Pico-, Nano- and Microplankton biomass SEAWATER SAMPLES for: -Nutrients -Size –fractionated chlorophyll (0.2, 2, & 20 µm) -Pico-, Nano- and Microplankton biomass Net Community Production (NCP) and Community Respiration (CR) by in situ 24 ligh-dark bottle oxygen incubations Net primary production by in situ 24 incubations of C14 Bacterial production by leucine uptake Vertical fluxes of organic carbon by in situ 24h deployment of a multitrap

7 Temperature (°C) Nitrate (µmol kg -1 ) Upwelling index (m 3 s -1 Km -1 ) Hydrographic conditions Results

8 Total chlorophyll a (mg m -3 ) Primary production (mg m -3 d -1 ) >20 μ m>2 μ m>0.2 μ m 57% 76% 32% Results

9 Microbial plankton biomass Integrated biomass (mg C m -2 ) Size class Contribution (%) Pico-Nano-Micro- Results

10 Production / respiration balance NCP (mmol O 2 m -3 d -1 ) CR (mmol O 2 m -3 d -1 ) BP (mg C m -3 d -1 ) Results

11 Vertical Carbon Fluxes (mg C m 2 d -1 ) Organic carbon Phytoplanktonic carbon Diatom carbon Results

12 NCP ( mmol O 2 m -2 d -1 ) BP (mmol C m 2 d -1 ) NCP ( mmol O 2 m -2 d -1 ) BP (mmol C m 2 d -1 ) Conclusions

13 NCP (g C m -2 d -1 ) Autotrophic biomass Heterotrophic biomass Conclusions

14 NCP 0.5 ±0.5 Respiration 0.5 ±0.3 Respiration 0.07 ±0.03 Carbon flux 0.29 ±0.02 DOWNWELLING SEASON 58% 50% 24% NCP 2.1 ±2.0 Respiration 0.9 ±1.0 Respiration 0.2 ±0.1 Carbon flux 0.4 ±0.2 UPWELLING SEASON aphotic zone photic zone 19% 70% 50% Conclusions g C m -2 d -1

15 Thank you for your attention


Download ppt "NCP ( mmol O 2 m -2 d -1 ) BP (mmol C m 2 d -1 ) NET ECOSYSTEM METABOLISM IN THE NW IBERIAN UPWELLING SYSTEM ON AN ANNUAL CYCLE C.G.Castro, Arbones B,"

Similar presentations


Ads by Google