Simulated heat storage in a perennially ice-covered high Arctic lake: sensitivity to climate change
[1] Perennially ice-covered, meromictic lakes occur along the northern coast of Ellesmere Island in the Canadian high Arctic and have distinctive conductivity and temperature profiles. They are salinity stratified and have deep thermal maxima that persist throughout the year at temperatures up to 60...
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2008
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.3537 http://www.cen.ulaval.ca/warwickvincent/PDFfiles/230.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.595.3537 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.595.3537 2023-05-15T14:51:56+02:00 Simulated heat storage in a perennially ice-covered high Arctic lake: sensitivity to climate change Aaron C. Vincent Derek R. Mueller Warwick F. Vincent The Pennsylvania State University CiteSeerX Archives 2008 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.3537 http://www.cen.ulaval.ca/warwickvincent/PDFfiles/230.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.3537 http://www.cen.ulaval.ca/warwickvincent/PDFfiles/230.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.cen.ulaval.ca/warwickvincent/PDFfiles/230.pdf text 2008 ftciteseerx 2016-01-08T13:42:31Z [1] Perennially ice-covered, meromictic lakes occur along the northern coast of Ellesmere Island in the Canadian high Arctic and have distinctive conductivity and temperature profiles. They are salinity stratified and have deep thermal maxima that persist throughout the year at temperatures up to 60C above the winter minimum in the overlying atmosphere. Heat transfer in one of these lakes (Lake A, latitude 83.0N, longitude 75.4W) was simulated using a high spatial resolution model based on a one-dimensional heat diffusion and radiative transfer equation, which was solved through numerical integration. Boundary conditions were forced using climate data from an automated weather station installed next to the lake. There was a good fit between simulated and observed water column temperatures, including the midwater temperature maximum of 8.5C, after 63 years of heating (RMSE = 0.10C). This suggests that Lake A became ice-free in the 1940s, a known period of intense warming of the circumpolar Arctic. The model was sensitive to forcing by photosynthetically active radiation (PAR, 400–700 nm), in addition to optically related parameters such as surface reflectance, snow and ice cover, and the PAR diffuse attenuation coefficient. The unusual thermal structure is affected by stratified layers of pigmented microbial communities, which enhance the absorption of solar radiation. Simulation of ice-free summers revealed that the lake’s thermal profile would lose its characteristic shape over several decades and that ongoing climate change could reduce the thermal maximum from 8.5 to 4C within 50 years. Citation: Vincent, A. C., D. R. Mueller, and W. F. Vincent (2008), Simulated heat storage in a perennially ice-covered high Arctic Text Arctic Climate change Ellesmere Island Unknown Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Ellesmere Island Mueller ENVELOPE(55.533,55.533,-66.917,-66.917) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
[1] Perennially ice-covered, meromictic lakes occur along the northern coast of Ellesmere Island in the Canadian high Arctic and have distinctive conductivity and temperature profiles. They are salinity stratified and have deep thermal maxima that persist throughout the year at temperatures up to 60C above the winter minimum in the overlying atmosphere. Heat transfer in one of these lakes (Lake A, latitude 83.0N, longitude 75.4W) was simulated using a high spatial resolution model based on a one-dimensional heat diffusion and radiative transfer equation, which was solved through numerical integration. Boundary conditions were forced using climate data from an automated weather station installed next to the lake. There was a good fit between simulated and observed water column temperatures, including the midwater temperature maximum of 8.5C, after 63 years of heating (RMSE = 0.10C). This suggests that Lake A became ice-free in the 1940s, a known period of intense warming of the circumpolar Arctic. The model was sensitive to forcing by photosynthetically active radiation (PAR, 400–700 nm), in addition to optically related parameters such as surface reflectance, snow and ice cover, and the PAR diffuse attenuation coefficient. The unusual thermal structure is affected by stratified layers of pigmented microbial communities, which enhance the absorption of solar radiation. Simulation of ice-free summers revealed that the lake’s thermal profile would lose its characteristic shape over several decades and that ongoing climate change could reduce the thermal maximum from 8.5 to 4C within 50 years. Citation: Vincent, A. C., D. R. Mueller, and W. F. Vincent (2008), Simulated heat storage in a perennially ice-covered high Arctic |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Aaron C. Vincent Derek R. Mueller Warwick F. Vincent |
spellingShingle |
Aaron C. Vincent Derek R. Mueller Warwick F. Vincent Simulated heat storage in a perennially ice-covered high Arctic lake: sensitivity to climate change |
author_facet |
Aaron C. Vincent Derek R. Mueller Warwick F. Vincent |
author_sort |
Aaron C. Vincent |
title |
Simulated heat storage in a perennially ice-covered high Arctic lake: sensitivity to climate change |
title_short |
Simulated heat storage in a perennially ice-covered high Arctic lake: sensitivity to climate change |
title_full |
Simulated heat storage in a perennially ice-covered high Arctic lake: sensitivity to climate change |
title_fullStr |
Simulated heat storage in a perennially ice-covered high Arctic lake: sensitivity to climate change |
title_full_unstemmed |
Simulated heat storage in a perennially ice-covered high Arctic lake: sensitivity to climate change |
title_sort |
simulated heat storage in a perennially ice-covered high arctic lake: sensitivity to climate change |
publishDate |
2008 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.3537 http://www.cen.ulaval.ca/warwickvincent/PDFfiles/230.pdf |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) ENVELOPE(55.533,55.533,-66.917,-66.917) |
geographic |
Arctic Arctic Lake Ellesmere Island Mueller |
geographic_facet |
Arctic Arctic Lake Ellesmere Island Mueller |
genre |
Arctic Climate change Ellesmere Island |
genre_facet |
Arctic Climate change Ellesmere Island |
op_source |
http://www.cen.ulaval.ca/warwickvincent/PDFfiles/230.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.3537 http://www.cen.ulaval.ca/warwickvincent/PDFfiles/230.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766323078019678208 |