Cullen, J. T. Rutgers University-Institute of Marine and Coastal Sciences, cullen@imcs.rutgers.edu
Grzymski, J. T. Rutgers University-Institute of Marine and Coastal Sciences, joeg@imcs.rutgers.edu
Sherrell, R. M. Rutgers University-Institute of Marine and Coastal Sciences, sherrell@imcs.rutgers.edu
Schofield, O. Rutgers University-Institute of Marine and Coastal Sciences, oscar@imcs.rutgers.edu
Glenn, S. Rutgers University-Institute of Marine and Coastal Sciences, glenn@imcs.rutgers.edu

 
ESTIMATING SUSPENDED PARTICULATE MASS AND PARTICULATE ORGANIC CARBON FROM IN SITU OPTICAL DATA IN A COASTAL UPWELLING SYSTEM ON THE NEW JERSEY SHELF
 
Algorithms relating beam attenuation coefficient (beam-c) to suspended particulate matter (SPM) and particulate organic carbon (POC) loads have been developed for waters whose optical properties are dominated by biota (case I waters). These algorithms tend to be less robust when applied to coastal areas where suspended particulate matter composition is complicated by riverine and sedimentary organic/inorganic particle sources (case II waters). In an effort to assess the utility of such relationships for inner shelf waters we measured in situ beam attenuation coefficients with a Sea Tech transmissometer (10cm pathlength; 660nm) in concert with a WetLabs AC-9 (650nm) and collected samples for SPM and POC analyses as part of the NOPP program off the southern New Jersey coast during episodic upwelling events in July 1998. During this time the inherent optical properties of the water were highly variable. Surface water (1-5m) regressions of beam-c (660nm) against SPM and POC were robust and yielded slopes of 0.455 L/mg.m (r^2= 0.718) and 0.0028 L/ug.m (r^2= 0.955), respectively. Regression of attenuation at 650nm against SPM and POC yielded slopes of 0.402 L/mg.m (r^2=0.770) and 0.0023 L/ug.m (r^2=0.837). These relationships demonstrate the potential for deriving high resolution distributions of POC from in situ optical measurements for inner shelf waters during periods of dynamic physical and biological activity.
 
Day: Friday, Feb. 5
Time: 11:15 - 11:30am
Location: Hilton of Santa Fe
 
Code: SS12FR1115H