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Simulating the palaeorecord of northern European lakes using a coupled lake-catchment model

Vassiljev, Jüri LU (1997) In LUNDQUA Thesis 41.
Abstract
A coupled lake-catchment model was developed to examine the controls on lake-level changes in currently overflowing lakes during Holocene. The lake energy-balance is simulated as the one-dimensional vertical heat transfer by eddy diffusion and convective mixing. The accumulation and ablation of lake ice, and snow cover on the ice, is simulated thermodynamically. The lake water-balance is given by the balance between precipitation over the lake, evaporation from the water surface, catchment runoff, and lake outflow. Runoff is calculated using a one-dimensional, two layer soil covered by vegetation and a snowpack. Snow accumulation and ablation are controlled by air temperature. Outflow is controlled by the outlet size and outflow velocity,... (More)
A coupled lake-catchment model was developed to examine the controls on lake-level changes in currently overflowing lakes during Holocene. The lake energy-balance is simulated as the one-dimensional vertical heat transfer by eddy diffusion and convective mixing. The accumulation and ablation of lake ice, and snow cover on the ice, is simulated thermodynamically. The lake water-balance is given by the balance between precipitation over the lake, evaporation from the water surface, catchment runoff, and lake outflow. Runoff is calculated using a one-dimensional, two layer soil covered by vegetation and a snowpack. Snow accumulation and ablation are controlled by air temperature. Outflow is controlled by the outlet size and outflow velocity, using the Manning equation. The coupled model was validated for Lake Bysjön (southern Sweden) and Lakes Karujärv and Viljandi (Estonia). The simulated monthly lake level matched observations of lake-level changes between 1944-1956 at Lake Viljandi (r=0.78), between 1976-1987 at Lake Karujärv (r=0.78) and between 1973-1977 at Lake Bysjön (r=0.7).



The model was used to examine lake-level sensitivity to changes in individual climatic parameters. Changes in radiation, temperature, vapour pressure and wind strength produce lake-level changes of <0.5 m. Changes in mean annual and winter precipitation produce changes an order of magnitude larger. The lake-level sensitivity to precipitation changes is greatest when winter temperatures were higher than present. The magnitude of the response to a specific climatic change is strongly affected by the ratio of the lake area to the catchment area. (Less)
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author
opponent
  • Dr Evans, Samuel, Soil Survey & Land Research Centre, Cranfield University, Bedfordshire, MK45 4TD, UK
organization
publishing date
type
Thesis
publication status
published
subject
keywords
climatology, cartography, pedology, geomorphology, Physical geography, northern Europe, catchment geometry, Holocene, overflow lakes, climate change, Water- and energy-balance modelling, lake-level changes, Fysisk geografi, geomorfologi, marklära, kartografi, klimatologi, Geophysics, physical oceanography, meteorology, Geofysik, fysisk oceanografi, meteorologi
in
LUNDQUA Thesis
volume
41
pages
19 pages
publisher
Department of Quaternary Geology, Lund University
defense location
Zoologiska institutionens högtidssal, Helgonavägen 3
defense date
1997-05-29 10:15
external identifiers
  • other:ISRN: SE-LUNBDS/NBGK-97/41+19p
  • scopus:0031424449
ISSN
0281-3033
language
English
LU publication?
yes
id
118e1cb4-8227-47a3-8091-dfdedad8ea88 (old id 29347)
date added to LUP
2007-06-13 13:42:21
date last changed
2017-07-30 04:26:22
@phdthesis{118e1cb4-8227-47a3-8091-dfdedad8ea88,
  abstract     = {A coupled lake-catchment model was developed to examine the controls on lake-level changes in currently overflowing lakes during Holocene. The lake energy-balance is simulated as the one-dimensional vertical heat transfer by eddy diffusion and convective mixing. The accumulation and ablation of lake ice, and snow cover on the ice, is simulated thermodynamically. The lake water-balance is given by the balance between precipitation over the lake, evaporation from the water surface, catchment runoff, and lake outflow. Runoff is calculated using a one-dimensional, two layer soil covered by vegetation and a snowpack. Snow accumulation and ablation are controlled by air temperature. Outflow is controlled by the outlet size and outflow velocity, using the Manning equation. The coupled model was validated for Lake Bysjön (southern Sweden) and Lakes Karujärv and Viljandi (Estonia). The simulated monthly lake level matched observations of lake-level changes between 1944-1956 at Lake Viljandi (r=0.78), between 1976-1987 at Lake Karujärv (r=0.78) and between 1973-1977 at Lake Bysjön (r=0.7).<br/><br>
<br/><br>
The model was used to examine lake-level sensitivity to changes in individual climatic parameters. Changes in radiation, temperature, vapour pressure and wind strength produce lake-level changes of &lt;0.5 m. Changes in mean annual and winter precipitation produce changes an order of magnitude larger. The lake-level sensitivity to precipitation changes is greatest when winter temperatures were higher than present. The magnitude of the response to a specific climatic change is strongly affected by the ratio of the lake area to the catchment area.},
  author       = {Vassiljev, Jüri},
  issn         = {0281-3033},
  keyword      = {climatology,cartography,pedology,geomorphology,Physical geography,northern Europe,catchment geometry,Holocene,overflow lakes,climate change,Water- and energy-balance modelling,lake-level changes,Fysisk geografi,geomorfologi,marklära,kartografi,klimatologi,Geophysics,physical oceanography,meteorology,Geofysik,fysisk oceanografi,meteorologi},
  language     = {eng},
  pages        = {19},
  publisher    = {Department of Quaternary Geology, Lund University},
  school       = {Lund University},
  series       = {LUNDQUA Thesis},
  title        = {Simulating the palaeorecord of northern European lakes using a coupled lake-catchment model},
  volume       = {41},
  year         = {1997},
}