Resolving a persistent offshore surface temperature maximum in Lake Superior using an autonomous underwater glider
Keywords:
physical limnology, autonomous glider, thermal structure, shelf dynamics, shelf coolingAbstract
In November 2009, an autonomous underwater glider (AUG) was deployed for a period of 12 days on the Wisconsin Shelf of Lake Superior. During this period, the AUG made repeated cross-shelf transects from 3 km to 13 km offshore, making 26 cross-shelf transects in all, during which time temperature was measured. Each of these transects displayed a mid-shelf temperature maximum roughly 8 km offshore, with cooler waters both inshore and offshore of this. This is hypothesized to be due to a balance of persistent cooling at the surface and vertical mixing of cooler sub-thermocline waters offshore.
References
Auer, M. T. and Gatzke, T. L. 2004. The Spring Runoff Event, Thermal Bar Formation, and Cross Margin Transport in Lake Superior. Journal of Great Lakes Research, 30(Supplement 1): 64–81.
Austin, J. A. and Allen, J. 2011. Sensitivity of summer Lake Superior thermal structure to meteorological forcing. Limnology and Oceanography, 53(3)
Fairall, C. W., Bradley, E. F., Rogers, D. P., Edson, J. B. and Young, G. S. 1996. Bulk parameterization of air-sea fluxes for Tropical Ocean Global Atmosphere Coupled Ocean Atmosphere Response Experiment. Journal of Geophysical Research-Oceans, 101: 3747–3764.
Glenn, S., Jones, C., Twardowski, M., Bowers, L., Kerfoot, J., Kohut, J., Webb, D. and Schofield, O. 2008. Glider Observations of Sediment Resuspension in a Middle Atlantic Bight Fall Transition storm. Limnology and Oceanography, 53(5): 2180–2196.
Hodges, B. A. and Fratantoni, D. M. 2009. A thin layer of phytoplankton observed in the Phillipine Sea with a synthetic moored array of autonomous gliders. Journal of Geophysical Research- Oceans, 114: C10020
Lentz, S. J. 1992. The Surface Boundary Layer in Coastal Upwelling Regions. J. Phys. Oceanogr., 22: 1517–1539.
Perry, M. J., Sackmann, B. S., Eriksen, C. C. and Lee, C. M. 2008. Glider observations of blooms and subsurface chlorophyll maxima off the Washington coast. Limnology and Oceanography, 53(5): 2169–2179.
Pringle, J. M. 2001. Cross-shelf eddy heat transport in a wind-free coastal ocean undergoing winter time cooling. J. Geophys. Res., 106(C2): 2589
Ralph, E. A. 2002. Scales and Structures of large lake eddies. Geophysical Research Letters, 29(24) doi:10.1029/2001GL014654
Rudnick, D. L., Davis, R. E. and Eriksen, C. C. 2004. Underwater Gliders for Ocean Research. Marine Technology Society Journal, 38(2): 73–84.
Smith, R. L. 1995. “The Physical Process of Coastal Ocean Upwelling Systems”. In Upwelling in the Coastal Ocean: Modern Processes and Ancient Records, 39–64. Berlin: Wiley. . In: C.P. Summerhayes, K.-C. Emeis, M. Emeis, V. Angel, R.L. Smith, B. Zeitzschel (Eds.)
Ullman, D., Brown, J., Cornillon, P. and Mavor, T. 1998. Surface Temperature Fronts in the Great Lakes. Journal of Great Lakes Research, 24(4): 753–775.
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