Assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: Implications for Arctic ice algae primary production
Primary production estimates of ice algae within the bottommost layers of the Arctic ice cover are commonly derived using irradiance measurements taken immediately below the solid ice bottom. However, radiation absorbed by ice algae is significantly affected by the high‐scattering sea ice environmen...
Published in: | Limnology and Oceanography |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2013
|
Subjects: | |
Online Access: | http://dx.doi.org/10.4319/lo.2013.58.3.0893 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2013.58.3.0893 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2013.58.3.0893 |
id |
crwiley:10.4319/lo.2013.58.3.0893 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.4319/lo.2013.58.3.0893 2024-09-15T18:11:19+00:00 Assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: Implications for Arctic ice algae primary production Ehn, Jens K. Mundy, C. J. 2013 http://dx.doi.org/10.4319/lo.2013.58.3.0893 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2013.58.3.0893 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2013.58.3.0893 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 58, issue 3, page 893-902 ISSN 0024-3590 1939-5590 journal-article 2013 crwiley https://doi.org/10.4319/lo.2013.58.3.0893 2024-07-18T04:22:32Z Primary production estimates of ice algae within the bottommost layers of the Arctic ice cover are commonly derived using irradiance measurements taken immediately below the solid ice bottom. However, radiation absorbed by ice algae is significantly affected by the high‐scattering sea ice environment they are embedded within because scattering increases the pathlength traveled by photons and therefore the probability of photon encounters with algal cells. Failing to account for this enhanced absorption may considerably affect estimates of the timing and magnitude of ice algal production. To demonstrate the effect of scattering and attenuation, multipliers for absorption amplification (Φ) and layer average opacity ( χ ) were derived from observations of chlorophyll a concentration and the vertical attenuation coefficient over the bottom 2.5 cm of landfast sea ice. Φ reached values over 19 at low chlorophyll a , but became < 2 at high biomass levels, whereas χ became larger as biomass levels increased. Using Φ to construct an apparent photosynthesis vs. irradiance relationship showed that light limitation is greatly reduced relative to the case where scattering is not considered. This highlights an important interaction not previously noted for ice algal production in their high‐scattering environment. Knowledge of this absorption amplification can help explain ice algal phenology during the spring bloom and will improve ice algal production estimates and model parameterizations. Article in Journal/Newspaper ice algae Sea ice Wiley Online Library Limnology and Oceanography 58 3 893 902 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Primary production estimates of ice algae within the bottommost layers of the Arctic ice cover are commonly derived using irradiance measurements taken immediately below the solid ice bottom. However, radiation absorbed by ice algae is significantly affected by the high‐scattering sea ice environment they are embedded within because scattering increases the pathlength traveled by photons and therefore the probability of photon encounters with algal cells. Failing to account for this enhanced absorption may considerably affect estimates of the timing and magnitude of ice algal production. To demonstrate the effect of scattering and attenuation, multipliers for absorption amplification (Φ) and layer average opacity ( χ ) were derived from observations of chlorophyll a concentration and the vertical attenuation coefficient over the bottom 2.5 cm of landfast sea ice. Φ reached values over 19 at low chlorophyll a , but became < 2 at high biomass levels, whereas χ became larger as biomass levels increased. Using Φ to construct an apparent photosynthesis vs. irradiance relationship showed that light limitation is greatly reduced relative to the case where scattering is not considered. This highlights an important interaction not previously noted for ice algal production in their high‐scattering environment. Knowledge of this absorption amplification can help explain ice algal phenology during the spring bloom and will improve ice algal production estimates and model parameterizations. |
format |
Article in Journal/Newspaper |
author |
Ehn, Jens K. Mundy, C. J. |
spellingShingle |
Ehn, Jens K. Mundy, C. J. Assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: Implications for Arctic ice algae primary production |
author_facet |
Ehn, Jens K. Mundy, C. J. |
author_sort |
Ehn, Jens K. |
title |
Assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: Implications for Arctic ice algae primary production |
title_short |
Assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: Implications for Arctic ice algae primary production |
title_full |
Assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: Implications for Arctic ice algae primary production |
title_fullStr |
Assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: Implications for Arctic ice algae primary production |
title_full_unstemmed |
Assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: Implications for Arctic ice algae primary production |
title_sort |
assessment of light absorption within highly scattering bottom sea ice from under‐ice light measurements: implications for arctic ice algae primary production |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.4319/lo.2013.58.3.0893 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2013.58.3.0893 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2013.58.3.0893 |
genre |
ice algae Sea ice |
genre_facet |
ice algae Sea ice |
op_source |
Limnology and Oceanography volume 58, issue 3, page 893-902 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2013.58.3.0893 |
container_title |
Limnology and Oceanography |
container_volume |
58 |
container_issue |
3 |
container_start_page |
893 |
op_container_end_page |
902 |
_version_ |
1810448902220939264 |