ESTIMATES OF MICRO-, NANO-, AND PICOPLANKTON CONTRIBUTIONS TO PARTICLE EXPORT IN THE NORTHEAST PACIFIC
The contributions of micro-, nano-, and picoplankton to particle export were estimated from measurements of size-fractionated particulate 234Th, organic carbon, and phytoplankton indicator pigments obtained during five cruises between 2010 and 2012 along Line P in the subarctic northeast Pacific Oce...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:theses-1359 2023-07-30T04:07:09+02:00 ESTIMATES OF MICRO-, NANO-, AND PICOPLANKTON CONTRIBUTIONS TO PARTICLE EXPORT IN THE NORTHEAST PACIFIC Mackinson, Brendan L. 2014-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/theses/357 https://doi.org/10.23860/thesis-mackinson-brendan-2014 https://digitalcommons.uri.edu/context/theses/article/1359/viewcontent/Mackinson_uri_0186M_11002.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/theses/357 doi:10.23860/thesis-mackinson-brendan-2014 https://digitalcommons.uri.edu/context/theses/article/1359/viewcontent/Mackinson_uri_0186M_11002.pdf Open Access Master's Theses text 2014 ftunivrhodeislan https://doi.org/10.23860/thesis-mackinson-brendan-2014 2023-07-17T18:53:27Z The contributions of micro-, nano-, and picoplankton to particle export were estimated from measurements of size-fractionated particulate 234Th, organic carbon, and phytoplankton indicator pigments obtained during five cruises between 2010 and 2012 along Line P in the subarctic northeast Pacific Ocean. Sinking fluxes of particulate organic carbon (POC) and indicator pigments were calculated from 234Th– 238U disequilibria and, during two cruises, measured by sediment trap at Ocean Station Papa. POC fluxes at 100 m ranged from 0.65 – 7.95 mmol m-2 d-1, similar in magnitude to previous results at Line P. Microplankton pigments dominate indicator pigment fluxes (averaging 69±19% of total pigment flux), while nanoplankton pigments comprised the majority of pigment standing stocks (averaging 64±23% of total pigment standing stock). Indicator pigment loss rates (the ratio of pigment export flux to pigment standing stock) point to preferential export of larger microplankton relative to smaller nano- and picoplankton. However, indicator pigments do not quantitatively trace particle export resulting from zooplankton grazing, which may be an important pathway for the export of small phytoplankton. These results have important implications for understanding the magnitude and mechanisms controlling the biological pump at Line P in particular, and more generally in oligotrophic gyres and high-nutrient, low-chlorophyll regions where small phytoplankton represent a major component of the autotrophic community. Text Subarctic University of Rhode Island: DigitalCommons@URI Pacific |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
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description |
The contributions of micro-, nano-, and picoplankton to particle export were estimated from measurements of size-fractionated particulate 234Th, organic carbon, and phytoplankton indicator pigments obtained during five cruises between 2010 and 2012 along Line P in the subarctic northeast Pacific Ocean. Sinking fluxes of particulate organic carbon (POC) and indicator pigments were calculated from 234Th– 238U disequilibria and, during two cruises, measured by sediment trap at Ocean Station Papa. POC fluxes at 100 m ranged from 0.65 – 7.95 mmol m-2 d-1, similar in magnitude to previous results at Line P. Microplankton pigments dominate indicator pigment fluxes (averaging 69±19% of total pigment flux), while nanoplankton pigments comprised the majority of pigment standing stocks (averaging 64±23% of total pigment standing stock). Indicator pigment loss rates (the ratio of pigment export flux to pigment standing stock) point to preferential export of larger microplankton relative to smaller nano- and picoplankton. However, indicator pigments do not quantitatively trace particle export resulting from zooplankton grazing, which may be an important pathway for the export of small phytoplankton. These results have important implications for understanding the magnitude and mechanisms controlling the biological pump at Line P in particular, and more generally in oligotrophic gyres and high-nutrient, low-chlorophyll regions where small phytoplankton represent a major component of the autotrophic community. |
format |
Text |
author |
Mackinson, Brendan L. |
spellingShingle |
Mackinson, Brendan L. ESTIMATES OF MICRO-, NANO-, AND PICOPLANKTON CONTRIBUTIONS TO PARTICLE EXPORT IN THE NORTHEAST PACIFIC |
author_facet |
Mackinson, Brendan L. |
author_sort |
Mackinson, Brendan L. |
title |
ESTIMATES OF MICRO-, NANO-, AND PICOPLANKTON CONTRIBUTIONS TO PARTICLE EXPORT IN THE NORTHEAST PACIFIC |
title_short |
ESTIMATES OF MICRO-, NANO-, AND PICOPLANKTON CONTRIBUTIONS TO PARTICLE EXPORT IN THE NORTHEAST PACIFIC |
title_full |
ESTIMATES OF MICRO-, NANO-, AND PICOPLANKTON CONTRIBUTIONS TO PARTICLE EXPORT IN THE NORTHEAST PACIFIC |
title_fullStr |
ESTIMATES OF MICRO-, NANO-, AND PICOPLANKTON CONTRIBUTIONS TO PARTICLE EXPORT IN THE NORTHEAST PACIFIC |
title_full_unstemmed |
ESTIMATES OF MICRO-, NANO-, AND PICOPLANKTON CONTRIBUTIONS TO PARTICLE EXPORT IN THE NORTHEAST PACIFIC |
title_sort |
estimates of micro-, nano-, and picoplankton contributions to particle export in the northeast pacific |
publisher |
DigitalCommons@URI |
publishDate |
2014 |
url |
https://digitalcommons.uri.edu/theses/357 https://doi.org/10.23860/thesis-mackinson-brendan-2014 https://digitalcommons.uri.edu/context/theses/article/1359/viewcontent/Mackinson_uri_0186M_11002.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Open Access Master's Theses |
op_relation |
https://digitalcommons.uri.edu/theses/357 doi:10.23860/thesis-mackinson-brendan-2014 https://digitalcommons.uri.edu/context/theses/article/1359/viewcontent/Mackinson_uri_0186M_11002.pdf |
op_doi |
https://doi.org/10.23860/thesis-mackinson-brendan-2014 |
_version_ |
1772820297064382464 |