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Expand Up @@ -226,12 +226,12 @@ Assessment of Nutrient Supply by a Tidal Jet in the Northern Strait of Georgia B
Cluster Analysis of Biophysical Dynamics
========================================
A cluster-based tool for model analysis and evaluation was developed and used to
A cluster-based tool for model analysis and evaluation was developed and used to
determine biophysical dynamics of the system in:
Jarníková, T., Olson, E. M., Allen, S. E., Ianson, D., and Suchy, K. D., **2021**.
A Clustering Approach to Determine Biophysical Provinces and Physical Drivers of
Productivity Dynamics in a Complex Coastal Sea.
Jarníková, T., Olson, E. M., Allen, S. E., Ianson, D., and Suchy, K. D., **2021**.
A Clustering Approach to Determine Biophysical Provinces and Physical Drivers of
Productivity Dynamics in a Complex Coastal Sea.
*Ocean Sci. Discuss.*, 1-36.
`https://doi.org/10.5194/os-2021-66`_
Expand All @@ -241,30 +241,30 @@ Productivity Dynamics in a Complex Coastal Sea.
@article{Jarnikova-etal-2021,
author = "Jarníková, T., Olson, E. M., Allen, S. E., Ianson, D., and Suchy, K. D.",
title = "A clustering approach to determine biophysical provinces and physical
title = "A clustering approach to determine biophysical provinces and physical
drivers of productivity dynamics in a complex coastal sea",
journal = "Ocean Sci. Discuss.",
year = "2021",
url = "https://doi.org/10.5194/os-2021-66",
abstract = "The balance between ocean mixing and stratification influences
primary productivity through light limitation and nutrient supply in the
euphotic ocean. Here, we apply a hierarchical clustering algorithm
(Ward's method) to four factors relating to stratification and depth-integrated
phytoplankton biomass extracted from a biophysical regional ocean model of the
Salish Sea to assess spatial co-occurrence. Running the clustering algorithm on
four years of model output, we identify distinct regions of the model domain that
exhibit contrasting wind and freshwater input dynamics, as well as regions of
varying watercolumn-averaged vertical eddy diffusivity and halocline depth regimes.
The spatial regionalizations in physical variables are similar in all four
analyzed years. We also find distinct interannually consistent biological zones.
In the Northern Strait of Georgia and Juan de Fuca Strait, a deeper winter
halocline and episodic summer mixing coincide with higher summer diatom abundance,
while in the Fraser River stratified Central Strait of Georgia, shallower
haloclines and stronger summer stratification coincide with summer flagellate
abundance. Cluster based model results and evaluation suggest that the
Juan de Fuca Strait supports more biomass than previously thought. Our approach
elucidates probable physical mechanisms controlling phytoplankton abundance and
composition. It also demonstrates a simple, powerful technique for finding
abstract = "The balance between ocean mixing and stratification influences
primary productivity through light limitation and nutrient supply in the
euphotic ocean. Here, we apply a hierarchical clustering algorithm
(Ward's method) to four factors relating to stratification and depth-integrated
phytoplankton biomass extracted from a biophysical regional ocean model of the
Salish Sea to assess spatial co-occurrence. Running the clustering algorithm on
four years of model output, we identify distinct regions of the model domain that
exhibit contrasting wind and freshwater input dynamics, as well as regions of
varying watercolumn-averaged vertical eddy diffusivity and halocline depth regimes.
The spatial regionalizations in physical variables are similar in all four
analyzed years. We also find distinct interannually consistent biological zones.
In the Northern Strait of Georgia and Juan de Fuca Strait, a deeper winter
halocline and episodic summer mixing coincide with higher summer diatom abundance,
while in the Fraser River stratified Central Strait of Georgia, shallower
haloclines and stronger summer stratification coincide with summer flagellate
abundance. Cluster based model results and evaluation suggest that the
Juan de Fuca Strait supports more biomass than previously thought. Our approach
elucidates probable physical mechanisms controlling phytoplankton abundance and
composition. It also demonstrates a simple, powerful technique for finding
structure in large datasets and determining boundaries of biophysical provinces.",
doi = "10.5194/os-2021-66",
}
Expand All @@ -273,7 +273,7 @@ Productivity Dynamics in a Complex Coastal Sea.
SKOG, The Carbonate Chemistry Component of SalishSeaCast
========================================================
The three-dimensional carbonate chemistry model was developed and used to determine
The three-dimensional carbonate chemistry model was developed and used to determine
the anthropogenic increase in Salish Sea coastal carbon content in:
Jarníková T., Ianson D., Allen S.E., Shao A.E., Olson E.M.. **2022**.
Expand Down Expand Up @@ -320,3 +320,61 @@ Across a Sensitive Coastal System.
saturation state regime shift.",
doi = "10.1029/2021GB007024",
}
Zooplankton Spatial Distribution and Model Evaluation
=====================================================
SalishSeaCast was used to examine zooplankton dynamics in the Salish Sea and zooplankton
model classes were evaluated against a transboundary observation dataset in:
Suchy, K. D., Olson, E. M., Allen, S. E., Galbraith, M., Herrmann, B., Keister, J.E.,
Perry, R.I., Sastri, A. R., Young, K., **2023**.
Seasonal and regional variability of model-based zooplankton biomass in the Salish Sea and
evaluation against observations.
*Progress in Oceanography*, 219, 103171.
`https://doi.org/10.1016/j.pocean.2023.103171`_
.. _https://doi.org/10.1016/j.pocean.2023.103171: https://doi.org/10.1016/j.pocean.2023.103171
.. code-block:: tex
@article{Suchy-etal-2023,
author = "Suchy, K. D., Olson, E. M., Allen, S. E., Galbraith, M., Herrmann, B.,
Keister, J.E., Perry, R.I., Sastri, A. R., Young, K.",
title = "Seasonal and regional variability of model-based zooplankton biomass
in the Salish Sea and evaluation against observations",
journal = "Progress in Oceanography",
year = "2023",
volume = "219",
pages = "103171",
issn = "0079-6611",
url = "https://doi.org/10.1016/j.pocean.2023.103171",
keywords = "Zooplankton, Salish Sea, Biogeochemical model, Model evaluation,
Transboundary studies, Strait of Georgia, Puget Sound",
abstract = "We used a three-dimensional coupled biophysical model to examine
zooplankton dynamics in the Salish Sea, NE Pacific. First, we evaluated the two
zooplankton classes of the SalishSeaCast model using a transboundary zooplankton
dataset comprised of observation data from the Canadian and United States waters
of the Salish Sea from 2015 to 2019. Model zooplankton classes correspond to
micro- and meso-zooplankton whose biomass is tightly coupled to phytoplankton
through modelled food web dynamics (Z1) and mesozooplankton with life cycle-based
seasonal grazing impacts (Z2). Overall, the model effectively captured seasonal
patterns in observed biomass, although with slightly higher biomass estimates for
both Z1 and Z2 (Bias = 0.10 and 0.08 g C m−2, respectively). Model fit varied
regionally, with a weaker model fit being observed in nearshore regions.
In addition, an autumn peak in Z2 was observed in the model, but not in the
observations, suggesting some seasonal variations in model fit. Following the model
evaluation, we used the model to determine seasonal and regional patterns of
zooplankton grazing. Seasonally, the main peak in modelled zooplankton biomass
increased in April or May in most of the regions defined within the Salish Sea and
was driven by grazing on diatoms. Regionally, depth-integrated zooplankton biomass
was consistently highest in areas adjacent to regions of strong tidal mixing.
In addition, model-based zooplankton grazing was highest in the tidally mixed
regions where phytoplankton biomass was high due to advection into the region
despite low primary productivity. Our model-based results provide an opportunity
to examine bottom-up food web processes at spatio-temporal scales not achievable
with in situ sampling and help to elucidate key drivers of lower trophic level
dynamics within the Salish Sea."
doi = "10.1016/j.pocean.2023.103171",
}

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