Parameters for the depth of the ocean’s productive layer
Here we compare various parameters that are used to define the depth of the ocean’s productive layer, the euphotic zone, during the initiation of the spring phytoplankton bloom in the North Atlantic (47°N/20°W). These are (1) the compensation depth (Zc, where gross photosynthesis balances autotrophi...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-04-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1052307/full |
| _version_ | 1797853316398448640 |
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| author | John F. Marra John F. Marra W. Sean Chamberlin Carol A. Knudson W. Joseph Rhea Cheng Ho |
| author_facet | John F. Marra John F. Marra W. Sean Chamberlin Carol A. Knudson W. Joseph Rhea Cheng Ho |
| author_sort | John F. Marra |
| collection | DOAJ |
| description | Here we compare various parameters that are used to define the depth of the ocean’s productive layer, the euphotic zone, during the initiation of the spring phytoplankton bloom in the North Atlantic (47°N/20°W). These are (1) the compensation depth (Zc, where gross photosynthesis balances autotrophic respiration), (2) the depth horizon of 1% of surface photosynthetic active irradiance (Ed(0-,PAR), (3) depth horizon of 1% of surface Ed(488), and (4) the depth of the bottom of the fluorescence maximum. We also use two related parameters, the depth of the mixed layer and the ratio of integral gross production to integral respiration as a scaling factor for a proxy for the critical depth. Over the course of the observational period (25 April - 7 May, 1989), the mixed layer decreased from 162 to 20 m, and Zc decreased from 64 to 35 m. The depth of 1%Ed(0-,PAR) followed the trajectory of Zc, while Ed(488) and the depth of the bottom of the fluorescence maximum were about 10 m deeper, on average. These data support the criterion of the depth of “1%PAR” to describe the productive layer for more productive areas of the ocean. However, 1% of Ed(488) or the bottom of the fluorescence maximum could be used over a broader range of trophic conditions. |
| first_indexed | 2024-04-09T19:48:39Z |
| format | Article |
| id | doaj.art-5a68c310ce034432bf53ba656586749c |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-09T19:48:39Z |
| publishDate | 2023-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-5a68c310ce034432bf53ba656586749c2023-04-03T12:34:25ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452023-04-011010.3389/fmars.2023.10523071052307Parameters for the depth of the ocean’s productive layerJohn F. Marra0John F. Marra1W. Sean Chamberlin2Carol A. Knudson3W. Joseph Rhea4Cheng Ho5Earth and Environmental Sciences, Brooklyn College of the City University of New York, Brooklyn, NY, United StatesEarth and Environmental Sciences, Graduate Center of the City University of New York, New York, NY, United StatesEarth Sciences, Fullerton College, Fullerton, CA, United StatesLamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United StatesNaval Research Laboratory, Washington, DC, United StatesLamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United StatesHere we compare various parameters that are used to define the depth of the ocean’s productive layer, the euphotic zone, during the initiation of the spring phytoplankton bloom in the North Atlantic (47°N/20°W). These are (1) the compensation depth (Zc, where gross photosynthesis balances autotrophic respiration), (2) the depth horizon of 1% of surface photosynthetic active irradiance (Ed(0-,PAR), (3) depth horizon of 1% of surface Ed(488), and (4) the depth of the bottom of the fluorescence maximum. We also use two related parameters, the depth of the mixed layer and the ratio of integral gross production to integral respiration as a scaling factor for a proxy for the critical depth. Over the course of the observational period (25 April - 7 May, 1989), the mixed layer decreased from 162 to 20 m, and Zc decreased from 64 to 35 m. The depth of 1%Ed(0-,PAR) followed the trajectory of Zc, while Ed(488) and the depth of the bottom of the fluorescence maximum were about 10 m deeper, on average. These data support the criterion of the depth of “1%PAR” to describe the productive layer for more productive areas of the ocean. However, 1% of Ed(488) or the bottom of the fluorescence maximum could be used over a broader range of trophic conditions.https://www.frontiersin.org/articles/10.3389/fmars.2023.1052307/fullradiometerproductivityrespirationeuphotic depthPARfluorescence |
| spellingShingle | John F. Marra John F. Marra W. Sean Chamberlin Carol A. Knudson W. Joseph Rhea Cheng Ho Parameters for the depth of the ocean’s productive layer Frontiers in Marine Science radiometer productivity respiration euphotic depth PAR fluorescence |
| title | Parameters for the depth of the ocean’s productive layer |
| title_full | Parameters for the depth of the ocean’s productive layer |
| title_fullStr | Parameters for the depth of the ocean’s productive layer |
| title_full_unstemmed | Parameters for the depth of the ocean’s productive layer |
| title_short | Parameters for the depth of the ocean’s productive layer |
| title_sort | parameters for the depth of the ocean s productive layer |
| topic | radiometer productivity respiration euphotic depth PAR fluorescence |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2023.1052307/full |
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