The Underwater Photic Environment of a Small Arctic Lake
The underwater light field in a small arctic lake on Victoria Island, Northwest Territories, was examined. Downward radiance was found to be bimodal, with transmission peaks at 480 and 640 nanometres (nm, or .000000001 m). Upward radiance was similar near the surface, with peaks at 480 and 620 nm, b...
Published in: | ARCTIC |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Arctic Institute of North America
1990
|
Subjects: | |
Online Access: | https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64657 |
id |
ftunivcalgaryojs:oai:journalhosting.ucalgary.ca:article/64657 |
---|---|
record_format |
openpolar |
spelling |
ftunivcalgaryojs:oai:journalhosting.ucalgary.ca:article/64657 2023-05-15T14:19:13+02:00 The Underwater Photic Environment of a Small Arctic Lake Heinermann, P.H. Johnson, L. Ali, M.A. 1990-01-01 application/pdf https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64657 eng eng The Arctic Institute of North America https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64657/48571 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64657 ARCTIC; Vol. 43 No. 2 (1990): June: 99–200; 129-136 1923-1245 0004-0843 arctic limnology underwater light diurnal variation spectral quality irradiance radiance arctique limnologie lumiere sous-marine variation diurne qualité spectrale info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion research-article 1990 ftunivcalgaryojs 2022-03-22T21:21:48Z The underwater light field in a small arctic lake on Victoria Island, Northwest Territories, was examined. Downward radiance was found to be bimodal, with transmission peaks at 480 and 640 nanometres (nm, or .000000001 m). Upward radiance was similar near the surface, with peaks at 480 and 620 nm, but became unimodal with depth and shifted to 580 nm near the bottom. Diurnal variation in the underwater downward and upward irradiance of PAR (photosynthetically active radiation) was approximately two orders of magnitude. The spectral quality of light transmission also changed over this 24 hour period. Unimodal transmission of red light occurred in the early morning (1:00 and 5:00) and late evening (22:00), while bimodal transmission of blue-green and red light was observed during the day (9:00-17:30). Kd(Zm), the vertical attenuation coefficient for downward irradiance at the midpoint of the euphotic zone, was relatively insensitive to changes in solar elevation. Diurnal variation in the reflectance of PAR differed from the predicted by previous simulation models, while the inverse relationship between reflectance and the absorption coefficient was in agreement with these same models. Gilvin, humic material-dissolved iron complexes, algal fucoxanthin, chlorophyll a and tripton all contribute to the attenuation of light and are responsible for the unique underwater spectral transmission in Keyhole Lake. Article in Journal/Newspaper Arctic Arctic Arctique* Northwest Territories Victoria Island University of Calgary Journal Hosting Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Keyhole ENVELOPE(-67.338,-67.338,-68.785,-68.785) Keyhole Lake ENVELOPE(163.683,163.683,-78.133,-78.133) Lumiere ENVELOPE(-64.033,-64.033,-65.317,-65.317) Northwest Territories ARCTIC 43 2 |
institution |
Open Polar |
collection |
University of Calgary Journal Hosting |
op_collection_id |
ftunivcalgaryojs |
language |
English |
topic |
arctic limnology underwater light diurnal variation spectral quality irradiance radiance arctique limnologie lumiere sous-marine variation diurne qualité spectrale |
spellingShingle |
arctic limnology underwater light diurnal variation spectral quality irradiance radiance arctique limnologie lumiere sous-marine variation diurne qualité spectrale Heinermann, P.H. Johnson, L. Ali, M.A. The Underwater Photic Environment of a Small Arctic Lake |
topic_facet |
arctic limnology underwater light diurnal variation spectral quality irradiance radiance arctique limnologie lumiere sous-marine variation diurne qualité spectrale |
description |
The underwater light field in a small arctic lake on Victoria Island, Northwest Territories, was examined. Downward radiance was found to be bimodal, with transmission peaks at 480 and 640 nanometres (nm, or .000000001 m). Upward radiance was similar near the surface, with peaks at 480 and 620 nm, but became unimodal with depth and shifted to 580 nm near the bottom. Diurnal variation in the underwater downward and upward irradiance of PAR (photosynthetically active radiation) was approximately two orders of magnitude. The spectral quality of light transmission also changed over this 24 hour period. Unimodal transmission of red light occurred in the early morning (1:00 and 5:00) and late evening (22:00), while bimodal transmission of blue-green and red light was observed during the day (9:00-17:30). Kd(Zm), the vertical attenuation coefficient for downward irradiance at the midpoint of the euphotic zone, was relatively insensitive to changes in solar elevation. Diurnal variation in the reflectance of PAR differed from the predicted by previous simulation models, while the inverse relationship between reflectance and the absorption coefficient was in agreement with these same models. Gilvin, humic material-dissolved iron complexes, algal fucoxanthin, chlorophyll a and tripton all contribute to the attenuation of light and are responsible for the unique underwater spectral transmission in Keyhole Lake. |
format |
Article in Journal/Newspaper |
author |
Heinermann, P.H. Johnson, L. Ali, M.A. |
author_facet |
Heinermann, P.H. Johnson, L. Ali, M.A. |
author_sort |
Heinermann, P.H. |
title |
The Underwater Photic Environment of a Small Arctic Lake |
title_short |
The Underwater Photic Environment of a Small Arctic Lake |
title_full |
The Underwater Photic Environment of a Small Arctic Lake |
title_fullStr |
The Underwater Photic Environment of a Small Arctic Lake |
title_full_unstemmed |
The Underwater Photic Environment of a Small Arctic Lake |
title_sort |
underwater photic environment of a small arctic lake |
publisher |
The Arctic Institute of North America |
publishDate |
1990 |
url |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64657 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) ENVELOPE(-67.338,-67.338,-68.785,-68.785) ENVELOPE(163.683,163.683,-78.133,-78.133) ENVELOPE(-64.033,-64.033,-65.317,-65.317) |
geographic |
Arctic Arctic Lake Keyhole Keyhole Lake Lumiere Northwest Territories |
geographic_facet |
Arctic Arctic Lake Keyhole Keyhole Lake Lumiere Northwest Territories |
genre |
Arctic Arctic Arctique* Northwest Territories Victoria Island |
genre_facet |
Arctic Arctic Arctique* Northwest Territories Victoria Island |
op_source |
ARCTIC; Vol. 43 No. 2 (1990): June: 99–200; 129-136 1923-1245 0004-0843 |
op_relation |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64657/48571 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64657 |
container_title |
ARCTIC |
container_volume |
43 |
container_issue |
2 |
_version_ |
1766290815273926656 |