Spatial statistics of hydrography and water chemistry in a eutrophic boreal lake based on sounding and water samples

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Lepparanta , M , Lewis , J E , Heini , A & Arvola , L 2018 , ' Spatial statistics of hydrography and water chemistry in a eutrophic boreal lake based on sounding and water samples ' , Environmental Monitoring and Assessment , vol. 190 , no. 7 , 378 . https://doi.org/10.1007/s10661-018-6742-z

Title: Spatial statistics of hydrography and water chemistry in a eutrophic boreal lake based on sounding and water samples
Author: Lepparanta, Matti; Lewis, John E.; Heini, Anniina; Arvola, Lauri
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Lammi Biological Station
Date: 2018-07
Language: eng
Number of pages: 15
Belongs to series: Environmental Monitoring and Assessment
ISSN: 0167-6369
URI: http://hdl.handle.net/10138/302491
Abstract: Spatial variability, an essential characteristic of lake ecosystems, has often been neglected in field research and monitoring. In this study, we apply spatial statistical methods for the key physics and chemistry variables and chlorophyll a over eight sampling dates in two consecutive years in a large (area 103 km(2)) eutrophic boreal lake in southern Finland. In the four summer sampling dates, the water body was vertically and horizontally heterogenic except with color and DOC, in the two winter ice-covered dates DO was vertically stratified, while in the two autumn dates, no significant spatial differences in any of the measured variables were found. Chlorophyll a concentration was one order of magnitude lower under the ice cover than in open water. The Moran statistic for spatial correlation was significant for chlorophyll a and NO2+NO3-N in all summer situations and for dissolved oxygen and pH in three cases. In summer, the mass centers of the chemicals were within 1.5 km from the geometric center of the lake, and the 2nd moment radius ranged in 3.7-4.1 km respective to 3.9 km for the homogeneous situation. The lateral length scales of the studied variables were 1.5-2.5 km, about 1 km longer in the surface layer. The detected spatial "noise" strongly suggests that besides vertical variation also the horizontal variation in eutrophic lakes, in particular, should be considered when the ecosystems are monitored.
Subject: Eutrophic lake
Spatial variability
Ecosystem response
Water quality
Lake monitoring
SOUTHERN FINLAND
ECOSYSTEM METABOLISM
PHYTOPLANKTON
QUALITY
PHOSPHORUS
COMMUNITY
PAAJARVI
PLANKTON
1172 Environmental sciences
1181 Ecology, evolutionary biology
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