Award Abstract #0125301
Collaborative Research: Biogeochemical Cycling of Particulate and Dissolved Organic Matter in the Arctic Ocean Using Molecular Markers

NSF Org:	ARC Arctic Sciences Division
Initial Amendment Date:	January 7, 2002
Latest Amendment Date:	December 13, 2005
Award Number:	0125301
Award Instrument:	Continuing grant
Program Manager:	Neil R. Swanberg ARC Arctic Sciences Division OPP Office of Polar Programs
Start Date:	January 1, 2002
Expires:	December 31, 2007 (Estimated)
Awarded Amount to Date:	$483464
Investigator(s):	Ronald Benner benner@biol.sc.edu (Principal Investigator)
Sponsor:	University South Carolina Research Foundation 901 Sumter Street Columbia, SC 29208 803/777-7093
NSF Program(s):	ARCTIC SYSTEM SCIENCE PROGRAM, ARCTIC RESRCH SUPPRT & LOGISTI
Field Application(s):
Program Reference Code(s):	OTHR, EGCH, 9150, 5219, 1079, 0000
Program Element Code(s):	5219, 5205

ABSTRACT

The project combines field and experimental approaches to investigate the sources,

transformations, transport, and fates of dissolved, particulate and sedimentary organic matter in the

Beaufort and Chukchi Seas. This project will take advantage of the specificity that molecular organic

markers of organisms and their processes can provide to understand how the Western Arctic shelves

produce, metabolize and sequester carbon, a question central for the SBI program. The proposed studies

are closely linked with proposed research in other SBI phase II projects as well as international programs to

give an integrated, pan-Arctic view of C and N cycling. The proposed research is directed by the

following central hypotheses: 1) On time scales of physical transport across the shelf-basin boundary and interior ocean (years to decades), terrestrial organic matter contains specific, conservative biomarkers that trace riverine discharge; 2) Biological processing in shelf waters dictates the molecular signatures of organic matter deposited in sediments and exported to the Basin; 3) Episodic marine primary production fuels benthic production.

PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

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Benner, R., B. Benitez-Nelson, K. Kaiser, and R. M. W. Amon.  "Export of young terrigenous dissolved organic matter from rivers to the Arctic Ocean.,"  Geophysical Research Letters,  v.31,  2004,  p. L05305.

Cooper, L.W., R. Benner, J.W. McClelland, B.J. Peterson, R.M. Holmes, P.A. Raymond, D.A. Hansell, J.M. Grebmeier, and L.A. Codispotti..  "Linkages among runoff, dissolved organic carbon, and the stable oxygen isotope composition of seawater and other water mass indicators in the Arctic Ocean.,"  J. Geophys. Res.,  v.110,  2005,  p. 1.

J. Davis and R. Benner.  "Seasonal trends in the abundance and chemical composition of particulate and dissolved organic matter in the Chukchi/Beaufort Seas and Western Canada Basin.,"  Deep-Sea Research,  v.52,  2005,  p. 3396.

Jenny Davis and Ronald Benner.  "Quantitative estimates of labile and semi-labile dissolved organic carbon in the western Arctic Ocean: A molecular approach,"  Limnology and Oceanography,  v.52,  2007,  p. 2434.

Overpeck J. T. and 23 co-authors.  "Arctic system on trajectory to new, seasonally ice-free state,"  EOS,  v.86,  2005,  p. 309.


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