Turbulence and stratification in priest pot, a productive pond in a sheltered environment

Folkard, Andrew M., Sherborne, Amy J. and Coates, Michael 2007, Turbulence and stratification in priest pot, a productive pond in a sheltered environment, Limnology, vol. 8, no. 2, pp. 113-120, doi: 10.1007/s10201-007-0207-3.

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Title Turbulence and stratification in priest pot, a productive pond in a sheltered environment
Author(s) Folkard, Andrew M.
Sherborne, Amy J.
Coates, Michael
Journal name Limnology
Volume number 8
Issue number 2
Start page 113
End page 120
Publisher Springer Japan KK
Place of publication Tokyo, Japan
Publication date 2007-08
ISSN 1439-8621
Keyword(s) stratification
meteorological forcing
thermal microstructure
Summary Priest Pot is an example of the abundant ponds that, collectively, contribute crucially to species diversity. Despite extensive biological study, little has been reported about the physical framework that supports its ecological richness. This article elucidates the physical character of Priest Pot’s water column and thus that of similar water bodies. Vertical thermal microstructure profiles were recorded during summer 2003 and analyzed alongside concurrent meteorological data. During summer stratification, the thermal structure appeared to be dominated by surface heat fluxes. Surface wind stress, limited by sheltering vegetation, caused turbulent overturns once a surface mixed layer was present but appeared to contribute little to setting up the thermal structure. Variations in full-depth mean stratification occurred predominantly over seasonal and ∼5-day time scales, the passage of atmospheric pressure systems being posited as the cause of the latter. In the uppermost ∼0.5 m, where the stratification varied at subdaily time scales, turbulence was active (sensu Ivey and Imberger 1991) when this layer was mixed, with dissipation values ε ∼ 10−8 m2 s−3 and vertical diffusivity KZ = 10−4 — 10−6 m2 s−1. Where the water column was stratified, turbulence was strongly damped by both buoyancy and viscosity, and KZ was an order of magnitude smaller. Vertical transport in the mixed layer occurred via many small overturns (Thorpe scale r.m.s. and maximum values were typically 0.02 m and 0.10 m, respectively), and seston were fully mixed through the water column.
Notes Published online: July 7, 2007
Language eng
DOI 10.1007/s10201-007-0207-3
Field of Research 059999 Environmental Sciences not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ┬ęThe Japanese Society of Limnology, 2007
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007622

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