U.S. JGOFS
Synthesis & Modeling Project
   
George Jackson
Adrian Burd

Co-Investigators:
Martin Angel
Richard Lampitt
Understanding the carbon flows between the euphotic zone and 1000m depth

NSF

PROJECT DESCRIPTION: This work will develop a more detailed understanding of carbon flows below the euphotic zone. The 100-1000m depth region is important to study because large amounts of organic matter enter this region as particles settling out of the euphotic zone, but only small amounts exit by falling through the lower depth limit. In particular we will incorporate the role of organisms so as to be able to describe the carbon flows between different groups of animals and bacteria. Preliminary models suggest that the timing and magnitude of seasonal productivity can dramatically affect the amount of material that passes through on its way to the ocean floor. We plan to use data from several study areas including the sites of the JGOFS field programs starting with that of the North Atlantic Bloom Experiment.

This project should stimulate further studies of the sub-euphotic zone by highlighting the important processes determining the fate of oceanic primary production. The results should help the development of better global models of the carbon cycle.

 

DATA: Vertical Particle Flux Model with Predator-Prey Interactions
PUBLICATIONS:

Jackson, G. A., and A. B. Burd. 2002. A model for the distribution of particle flux in the mid-water column controlled by subsurface biotic interactions. Deep-Sea Research II 49: 193-217.

Burd, A. B., and G. A. Jackson. 2002. Modeling steady state particle size spectra. Environ. Sci. Technol. 36: 323-327.

Boyd, P. W., G. A. Jackson, and A. M. Waite. 2002. Are mesoscale perturbation experiments in polar waters prone to physical artefacts? Evidence from algal aggregation modelling studies. Geophys. Res. Let. 29: 10.1029/2001GL014210

Jackson, G. A. 2002. Collecting the garbage of the sea: the role of aggregation in ocean carbon transport. US JGOFS Newsletter 11 (4): 1-3, 10.

Burd, A. B., and G. A. Jackson. 2002. Illuminating the twilight zone: the effects of biological activity on midwater particle flux. US JGOFS Newletter 12 (1): 5-6.

Stemmann, L., G. A. Jackson, and D. Ianson. 2004. A vertical model of particle size distributions and fluxes in the midwater column that includes biological and physical processes. I. Model formulation. Deep-Sea Res. I, 51: 865--884

Stemmann, L., G. A. Jackson, and G. Gorsky. 2004. A vertical model of particle size distributions and fluxes in the midwater column that includes biological and physical processes. II. Application to a three year survey in the NW Mediterranean Sea. Deep-Sea Res. I 51: 885-908.

Burd, A. B., G. A. Jackson, R. S. Lampitt, and M. Follows. 2002. Shining a light on the ocean's twilight zone. EOS. 83 (49): 573

Jackson, G. A., and T. Kiørboe. 2004. Zooplankton use of chemodetection to find and eat particles. Mar. Ecol. Prog. Ser. 269: 153--162.

Ianson, D., G. A. Jackson, R. Lampitt, M. Angel, and A. B. Burd. The effect of net avoidance on estimates of diel vertical migration. Limnol. Oceanogr. Accepted, June 2004.

Visser, A. W., and G. A. Jackson. Characteristics of the chemical plume behind a sinking particle in a turbulent water column. Mar. Ecol. Prog. Ser. Accepted, July 2004.

RELATED PROJECTS: Jackson  "Development of upper-ocean aggregation models useful for interpreting and predicting carbon fluxes"

Ducklow; Roman; Jackson "Collaborative research: Ecosystem structure, biogeochemical fluxes and vulnerability to climate change perturbations"

 

INVESTIGATOR 
INFORMATION:
George A. Jackson
Department of Oceanography
Texas A&M University
College Station, TX 77843
tel: (979) 845-0405
fax: (979) 845-8219
gjackson@ocean.tamu.edu
http://oceanography.tamu.edu/~ecomodel/People/George/george.html

Adrian Burd
Department of Marine Sciences
University of Georgia
Athens, GA 30602-3636
tel: (706) 542-1604
fax: (706) 542-5888
htt p://alpha.marsci.uga.edu/Department_page/Profiles/aburd.htm

Martin Angel
George Deacon Division for Ocean Processes
Southampton Oceanography Center
University of Southampton
European Way
Southampton, SO14 3ZH
United Kingdom
tel: +44 0 23 8059 6666
m.v.angel@soc.soton.ac.uk

Richard Lampitt
George Deacon Division for Ocean Processes
Southampton Oceanography Center
University of Southampton
European Way
Southampton, SO14 3ZH
United Kingdom
tel: +44 0 23 8059 6347/6348
fax: +44 0 23 8059 6247
r.lampitt@soc.soton.ac.uk
http://www.soc.soton.ac.uk/GDD/midbio/Rsl_web1.htm