NDLI: Thermal and chemical stratification of urban ponds: Are they ‘completely mixed reactors’?

Content Provider	Springer Nature Link
Author	McEnroe, N. A. Buttle, J. M. Marsalek, J. Pick, F. R. Xepoulos, M. A. Frost, P. C.
Copyright Year	2012
Abstract	We examined whether relatively small urban ponds behave as ‘completely mixed reactors’ by measuring the stability and vertical heterogeneity of water column parameters. To do this, we measured profiles of water temperature and conductivity from the pond surface to the water-sediment interface twice during summer 2009 in 45 stormwater ponds located in the residential landscape of southern Ontario. These data were used to calculate water column stability indices and examine the relative importance of temperature and conductivity in controlling water column stratification. We also measured concentrations of dissolved oxygen (DO), dissolved organic carbon (DOC), total dissolved phosphorus (TDP),total dissolved nitrogen (TDN), particulate phosphorus and nitrogen (seston P and N), chlorophyll a (Chl-a), and total suspended solids (TSS) in surface and bottom waters. Despite their shallow depth (0.50–2.8 m), most ponds were stratified on the day of sampling and had relatively stable water columns both in June and August. Temperature differences rather than conductivity differences were better related to water column stability. Despite relatively stable water columns, vertical differences were not found for most water chemistry parameters, suggesting either recent mixing or relatively slow biogeochemical processing. Top-bottom differences were observed in June and August for DO and in June for TDN, seston N and TSS, reflecting a combination of processes influencing water column chemistry.
Starting Page	327
Ending Page	339
Page Count	13
File Format	PDF
ISSN	10838155
Journal	Urban Ecosystems
Volume Number	16
Issue Number	2
e-ISSN	15731642
Language	English
Publisher	Springer US
Publisher Date	2012-09-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Urban pond Stormwater retention Nutrient chemistry Densimetric stratification RTRM Brunt-Väisälä frequency index Urban Ecology Environmental Management Ecology Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Ecology Urban Studies

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