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BAG-1 : An Open Ocean Mesocosm Deployment December 1 st – 15 th 2011. Daniela Böttjer on behalf of the Bag-1 team University of Hawai’i: School of ocean and earth science and technology & Center for microbial oceanography: research and education.

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bag 1 an open ocean mesocosm deployment december 1 st 15 th 2011

BAG-1: An Open Ocean Mesocosm DeploymentDecember 1st – 15th 2011

Daniela Böttjer on behalf of the Bag-1 team

University of Hawai’i:

School of ocean and earth science and technology &

Center for microbial oceanography: research and education

Enhanced Ocean Upwelling Symposium November 2011

slide2

University of Hawaii

IFM GEOMAR

Oregon State University

UC Santa Cruz

  • David Karl
  • Matthew Church
  • Grieg Steward
  • Steve Poulos
  • Blake Watkins
  • Karin Björkman
  • Tara Clemente
  • Ken doggett
  • Eric Grabowski
  • Chris Schvarcz
  • ShimiRii
  • David pence
  • jenny mowatt
  • Daniela Böttjer
  • Ulf Riebesell
  • Klaus von Bröckel
  • Andrea Ludwig
  • Matthias Fischer
  • Jan Czerny
  • Jan Büdenbender
  • Detlef Hoffmann
  • Ricardo Letelier
  • Angelique White
  • Katie Watkins-Brandt
  • ZbigniewKolber
  • Sasha Tozzi

Enhanced Ocean Upwelling Symposium November 2011

outline
Outline
  • why are mesocosm studies important?
  • c-more & ifmgeomar collaboration
  • bag-1 timeline
  • bag-1 objectives
  • future bags

Enhanced Ocean Upwelling Symposium November 2011

why are mesocosm studies important
Why are mesocosm studies important ?
  • Potential drawbacks:
  • Bottle effect
  • Exclusion of rare organisms

60 000 L

1 L

20 L

Bottle Carboy Mesocosm Open ocean

Increasing volume

Enhanced Ocean Upwelling Symposium November 2011

collaboration between c more ifm geomar
collaboration between c-more & ifmgeomar
  • KOSMOS: kiel off-shore mesocosms for future ocean simulations
  • Part of a European network of mesocosm facilities (mesoaqua)
  • Prototype was designed in 2005
  • Since 2007 several full-scale field applications
  • 2011 First open ocean test off hawaii

Spitsbergen

2010

Proper Baltic

2007/2008

Bergen

2011

Hawaii

2011

Enhanced Ocean Upwelling Symposium November 2011

planning of bag 1
planning of BAG-1

Container

Shipped back

to Kiel

Arrival geomar

assemble team

Departure Return

Container

Arrival HNL

3 mesocosms

Shipped out of Kiel

Arrival

Cruise Participants

1st BAG

conference

c-more

proposal

submission

disassembling

Preparation for

container shipment

assembling of

3 mesocosms

bag-1

cruise

2004

July

2011

September

2011

November

2011

December

2011

January

2012

Enhanced Ocean Upwelling Symposium November 2011

bag 1 objectives
Bag-1 objectives

Engineering objectives

Scientific objectives

Study the effects nutrient additions on surface ocean plankton communities and processes

The successful deployment, maintenance (~10days) and recovery of 3 mesocosms in the open ocean

Image courtesy U.Riebesell

Enhanced Ocean Upwelling Symposium November 2011

engineering objectives i
Engineering Objectives I

Bag statistics

  • length: 17m
  • diameter: 2m
  • volume: 60 000L
  • material: Polyurethane
  • Frame: Fiberglass
  • + Sediment trap

Image courtesy IFM GEOMAR

Enhanced Ocean Upwelling Symposium November 2011

engineering objectives ii
Engineering Objectives II

rv ka imikaiokanaloa

Enhanced Ocean Upwelling Symposium November 2011

science objectives i
Science Objectives I

study the response of surface ocean plankton Communities to

the addition of deep-water nutrients

Ocean next to BAGs

BAG-A

BAG-B

BAG-C

Surface Seawater

only

Surface Seawater

+ Nitrate

+ Silicate

+ Trace metals

+ Vitamins

Surface Seawater

+ Nitrate

+ Phosphate

+ Silicate

+ Trace metals

+ Vitamins

Surface Seawater

Enhanced Ocean Upwelling Symposium November 2011

science objectives ii
Science Objectives II
  • Nutrients: Nitrite, nitrate, phosphate & silicate
  • Particulates: carbon, nitrogen, phosphorus &
  • silicate
  • Plankton enumeration: phyto- & zooplankton,
  • flow cytometry, viruses, dna/rna
  • Photosynthetic parameters: frrf,
  • pigments: Fluorometricchl-a, hplc
  • Gases: N2O, O2, CH4, DMS, CO2, O2/Ar
  • Rate measurements: Primary production,
  • Bacterial production, Respiration,
  • Microzooplankton grazing, Sediment fluxes

Daily sampling with depth-integrated sampler

Image courtesy EPOCA

Enhanced Ocean Upwelling Symposium November 2011

science objectives iii
Science Objectives III

Treatments for deck-board incubations

1) Surface Seawater (control)

2) Surface Seawater + N, Si, Trace metals, Vitamins

3) Surface Seawater + N, P, Si, Trace metals, Vitamins

4) Surface Seawater +ALOHA Deep water (1000m)

20L

10L

1L

small-scale

vs.

large-scale

Enhanced Ocean Upwelling Symposium November 2011

prospective
Prospective

Establish open ocean mesocsoms in hawaii for future bag expeditions

  • Future bag expeditions…
  • Deployment further offshore (station aloha)
  • Increase the number of mesocosms deployed
  • vary the type of perturbations (e.g. co2)

Thank you very much for your attention

Enhanced Ocean Upwelling Symposium November 2011