Drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the Nordic Seas
Spring phytoplankton blooms in the Nordic Seas contribute a large proportion of global primary production, and their timing and magnitude heavily impacts higher trophic levels. Two key drivers of bloom development, stratification and irradiance, vary seasonally and with latitude. In this study, spri...
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ftunivbergen:oai:bora.uib.no:1956/18088 2023-05-15T17:24:19+02:00 Drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the Nordic Seas Tessin, Elinor 2018-06-20T22:00:12Z application/pdf https://hdl.handle.net/1956/18088 eng eng The University of Bergen https://hdl.handle.net/1956/18088 Copyright the Author. All rights reserved Spring bloom phenology Phytoplankton ocean color Algeoppblomstringer Fenologi Planteplankton De Nordiske Hav https://data.ub.uio.no/realfagstermer/c032042 https://data.ub.uio.no/realfagstermer/c012754 https://data.ub.uio.no/realfagstermer/c005111 https://data.ub.uio.no/realfagstermer/c010560 751999 Master thesis 2018 ftunivbergen 2023-03-14T17:40:10Z Spring phytoplankton blooms in the Nordic Seas contribute a large proportion of global primary production, and their timing and magnitude heavily impacts higher trophic levels. Two key drivers of bloom development, stratification and irradiance, vary seasonally and with latitude. In this study, spring blooms along a latitudinal gradient in the Nordic Seas were observed in ocean color measurements and simulated in an idealized water column model with irradiance and vertical mixing (largely controlled by density stratification) as its main drivers. In both ocean color observations and simulations, a delay in spring bloom onset was observed south of 75°N. Phytoplankton dynamics in the idealized water column model were shown to be highly sensitive to turbulent diffusivity, a measure of vertical mixing highly dependent on stratification. Within a range of turbulent diffusivity, increased turbulent diffusivity led to delayed blooms with higher growth rates and magnitudes. At higher rates of mixing, population growth could not be sustained at the level required for a bloom, resulting instead in steady lowlevel phytoplankton concentrations. These results suggest that latitudinal variation in bloom timing can to a large degree be explained by latitudinal gradients of density stratification and irradiance. Master's Thesis in Biology MAMN-BIO BIO399 Master Thesis Nordic Seas University of Bergen: Bergen Open Research Archive (BORA-UiB) |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Spring bloom phenology Phytoplankton ocean color Algeoppblomstringer Fenologi Planteplankton De Nordiske Hav https://data.ub.uio.no/realfagstermer/c032042 https://data.ub.uio.no/realfagstermer/c012754 https://data.ub.uio.no/realfagstermer/c005111 https://data.ub.uio.no/realfagstermer/c010560 751999 |
spellingShingle |
Spring bloom phenology Phytoplankton ocean color Algeoppblomstringer Fenologi Planteplankton De Nordiske Hav https://data.ub.uio.no/realfagstermer/c032042 https://data.ub.uio.no/realfagstermer/c012754 https://data.ub.uio.no/realfagstermer/c005111 https://data.ub.uio.no/realfagstermer/c010560 751999 Tessin, Elinor Drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the Nordic Seas |
topic_facet |
Spring bloom phenology Phytoplankton ocean color Algeoppblomstringer Fenologi Planteplankton De Nordiske Hav https://data.ub.uio.no/realfagstermer/c032042 https://data.ub.uio.no/realfagstermer/c012754 https://data.ub.uio.no/realfagstermer/c005111 https://data.ub.uio.no/realfagstermer/c010560 751999 |
description |
Spring phytoplankton blooms in the Nordic Seas contribute a large proportion of global primary production, and their timing and magnitude heavily impacts higher trophic levels. Two key drivers of bloom development, stratification and irradiance, vary seasonally and with latitude. In this study, spring blooms along a latitudinal gradient in the Nordic Seas were observed in ocean color measurements and simulated in an idealized water column model with irradiance and vertical mixing (largely controlled by density stratification) as its main drivers. In both ocean color observations and simulations, a delay in spring bloom onset was observed south of 75°N. Phytoplankton dynamics in the idealized water column model were shown to be highly sensitive to turbulent diffusivity, a measure of vertical mixing highly dependent on stratification. Within a range of turbulent diffusivity, increased turbulent diffusivity led to delayed blooms with higher growth rates and magnitudes. At higher rates of mixing, population growth could not be sustained at the level required for a bloom, resulting instead in steady lowlevel phytoplankton concentrations. These results suggest that latitudinal variation in bloom timing can to a large degree be explained by latitudinal gradients of density stratification and irradiance. Master's Thesis in Biology MAMN-BIO BIO399 |
format |
Master Thesis |
author |
Tessin, Elinor |
author_facet |
Tessin, Elinor |
author_sort |
Tessin, Elinor |
title |
Drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the Nordic Seas |
title_short |
Drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the Nordic Seas |
title_full |
Drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the Nordic Seas |
title_fullStr |
Drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the Nordic Seas |
title_full_unstemmed |
Drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the Nordic Seas |
title_sort |
drivers of spatial variability in spring bloom onset and magnitude along a latitudinal gradient in the nordic seas |
publisher |
The University of Bergen |
publishDate |
2018 |
url |
https://hdl.handle.net/1956/18088 |
genre |
Nordic Seas |
genre_facet |
Nordic Seas |
op_relation |
https://hdl.handle.net/1956/18088 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766115278720073728 |