Urban, N. R. Michigan Technological University, nurban@mtu.edu
Bastone, A. R. Michigan Technological University, ambaston@mtu.edu
Gatzke, T. Michigan Technological University, tlgatzke@mtu.edu
Jeong, J. Michigan Technological University, jjeong@mtu.edu
Koca, D. S. Michigan Technological University, dskoca@mtu.edu

 
THE EPISODIC NATURE OF CROSS-MARGIN TRANSPORT OF PARTICLES ACROSS THE KEWEENAW CURRENT IN L. SUPERIOR
 
A central focus of the KITES (Keweenaw Interdisciplinary Transport Experiment in Superior) project is cross margin transport of particles and dissolved constituents. It is hypothesized that the Keweenaw current, a strong coastal jet, and the thermal bar impede transport of riverine inputs to the offshore zone. It is unknown to what extent the transport that does occur is seasonal (i.e., occurring during seasons when the current and thermal bar are minimal or non-existent) or episodic. Data from the first year of field measurements show that both the nature and concentrations of particulates are different in the near- and offshore zones. Total suspended solids in the nearshore zone range from 0.2 to 1.5 mg/L while those in the offshore zone generally are less than 0.5 mg/L. The elemental composition of the suspended particles indicates that the particle sources are different during July and, to a lesser extent, during May. This seasonal variability suggests that seasonal cross-margin transport of particles is important. However, sediment trap data show that settling particles are transported episodically to the offshore zone. Both the composition and deposition rates of particles respond to episodic events.
 
Day: Thursday, Feb. 4
Time: 11:00 - 11:15am
Location: Eldorado Hotel
 
Code: SS52TH1100E