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Axisymmetric circulation driven by marginal heating in ice-covered lakes
Citation
Kirillin, GB and Forrest, AL and Graves, KE and Fischer, AM and Engelhardt, C and Laval, BE, Axisymmetric circulation driven by marginal heating in ice-covered lakes, Geophysical Research Letters, 42, (8) pp. 2893-2900. ISSN 0094-8276 (2015) [Refereed Article]
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Copyright Statement
Copyright 2015 American Geophysical Union
Abstract
Below the temperature of maximum density (TMD) in freshwater lakes, heating at the lateral margins produces gravity currents along the bottom slope, akin to katabatic winds in the atmosphere and currents on continental shelves. We describe axisymmetric basin-scale circulation driven by heat flux at the shorelines in polar Lake Kilpisjärvi. A dense underflow originating near the shore converges toward the lake center, where it produces warm upwelling and return flow across the bulk of lake water column. The return flow, being subject to Coriolis force, creates a lake-wide anticyclonic gyre with velocities of 2–4 cm s-1. While warm underflows are common on ice-covered lakes, the key finding is the basin-scale anticyclonic gyre with warm upwelling in the core. This circulation mechanism provides a key to understanding transport processes in (semi) enclosed basins subject to negative buoyancy flux due to heating (or cooling at temperatures above TMD) at their lateral boundaries.
Item Details
Item Type: | Refereed Article |
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Keywords: | Coriolis, winter limnology, gyre, ice cover |
Research Division: | Earth Sciences |
Research Group: | Physical geography and environmental geoscience |
Research Field: | Geomorphology and earth surface processes |
Objective Division: | Environmental Management |
Objective Group: | Other environmental management |
Objective Field: | Other environmental management not elsewhere classified |
UTAS Author: | Forrest, AL (Dr Alexander Forrest) |
UTAS Author: | Fischer, AM (Dr Andy Fischer) |
ID Code: | 101290 |
Year Published: | 2015 |
Web of Science® Times Cited: | 35 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2015-06-16 |
Last Modified: | 2017-10-30 |
Downloads: | 198 View Download Statistics |
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