Presentation Abstract

Salish Sea Model Ecosystem - Lower Trophic (SMELT) is a three-dimensional biogeochemical model coupled to a NEMO-based physical model of the Salish Sea, run operationally at UBC as part of the SalishSeaCast system. In this presentation, we will first establish the model's skill at reproducing nitrate concentrations by comparison with data from the Pacific Salmon Foundation’s citizen science program and Institute of Ocean Sciences repeat surveys. We will then discuss episodic nitrate supply to the surface waters of the northwest Strait of Georgia. This phenomenon is evident as a region of elevated mean (March-November) and standard deviation (April-September) of surface nitrate stretching from Discovery Passage to Baynes Sound in a monthly climatology based on simulations from fall 2014 to present. We will analyze the relative contributions of southward advection of nitrate supplied through tidally-enhanced mixing in Discovery Passage and of local upwelling. This assessment will be based on analysis of SalishSeaCast simulations as well as additional numerical tracer experiments. We will discuss the importance of the phenomenon as a source of nutrients to the euphotic zone, fueling primary production in the northern Strait of Georgia.

Session Title

Modeling Change in the Transboundary Salish Sea

Keywords

Modelling, Phytoplankton, Nitrate

Conference Track

SSE15: Data and Information Management

Conference Name

Salish Sea Ecosystem Conference (Seattle, WA : 2018)

Document Type

Event

SSEC Identifier

SSE15-650

Start Date

5-4-2018 1:30 PM

End Date

5-4-2018 1:45 PM

Type of Presentation

Oral

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Geographic Coverage

Salish Sea (B.C. and Wash.)

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Type

text

Language

English

Format

application/pdf

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Apr 5th, 1:30 PM Apr 5th, 1:45 PM

Salish Sea model ecosystem - lower trophic: episodic nutrient supply in the northern Strait of Georgia

Salish Sea Model Ecosystem - Lower Trophic (SMELT) is a three-dimensional biogeochemical model coupled to a NEMO-based physical model of the Salish Sea, run operationally at UBC as part of the SalishSeaCast system. In this presentation, we will first establish the model's skill at reproducing nitrate concentrations by comparison with data from the Pacific Salmon Foundation’s citizen science program and Institute of Ocean Sciences repeat surveys. We will then discuss episodic nitrate supply to the surface waters of the northwest Strait of Georgia. This phenomenon is evident as a region of elevated mean (March-November) and standard deviation (April-September) of surface nitrate stretching from Discovery Passage to Baynes Sound in a monthly climatology based on simulations from fall 2014 to present. We will analyze the relative contributions of southward advection of nitrate supplied through tidally-enhanced mixing in Discovery Passage and of local upwelling. This assessment will be based on analysis of SalishSeaCast simulations as well as additional numerical tracer experiments. We will discuss the importance of the phenomenon as a source of nutrients to the euphotic zone, fueling primary production in the northern Strait of Georgia.