Streaming Media
Presentation Abstract
Oceanic temperatures and currents are the primary driving factors of almost every physical phenomenon on Earth and understanding them is key to studying almost every other aspect of Earth science. Possession Sound, a fjord-type estuary system in the Salish Sea, is home not only to incredible biodiversity but also to some very complex current systems and thermoclines. A particularly intriguing part of the Possession Sound fjord system is the extreme stratification of the halocline in certain areas. One such area can be found at the mouth of the Snohomish River, where cold freshwater from ice melts flows into warmer seawater, creating a stratified but unstable water column. As a result, very intricate temperature patterns can arise in this water system. Understanding the relationship between temperature and current speed throughout the water column is crucial to understanding how many other factors influence the local water system. This study aims to examine temporal patterns in the relationship between current speed and temperature at the mouth of the Snohomish River. Temperature data is collected from the Ocean Research College Academy's CTD mooring at the Everett Marina, and current speed data is collected from their ADCP in the same location. Previous studies conducted at ORCA suggest that during most parts of the tidal cycle, temperature readings at the surface correlate strongly with tidal stages, but when the tide cycle becomes less intense and current speeds decrease, this correlation disappears. It is hypothesized that this pattern represents a decrease in thermocline stratification during periods of slower current speeds. A major drawback of the study was its very narrow scope: only one month of continuous data was included. By expanding on prior research, this study will help contribute to a more complete understanding of the water column at the mouth of the Snohomish River.
Session Title
Poster Session 3: Land - Water Connections
Conference Track
SSE14: Posters
Conference Name
Salish Sea Ecosystem Conference (2022 : Online)
Document Type
Event
SSEC Identifier
SSE-posters-70
Start Date
27-4-2022 4:00 PM
End Date
27-4-2022 4:30 PM
Type of Presentation
Poster
Genre/Form
conference proceedings; presentations (communicative events)
Contributing Repository
Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.
Subjects – Topical (LCSH)
Water temperature--Washington (State)--Snohomish River Delta; Water temperature--Washington (State)--Possession Sound; Water currents--Washington (State)--Snohomish River Delta
Geographic Coverage
Salish Sea (B.C. and Wash.); Snohomish River Delta (Wash.); Possession Sound (Wash.)
Rights
Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Type
Text
Language
English
Format
application/pdf
Included in
Fresh Water Studies Commons, Marine Biology Commons, Natural Resources and Conservation Commons, Terrestrial and Aquatic Ecology Commons
Exploring Temporal Patterns in Temperature and Current Speed at the Mouth of the Snohomish River
Oceanic temperatures and currents are the primary driving factors of almost every physical phenomenon on Earth and understanding them is key to studying almost every other aspect of Earth science. Possession Sound, a fjord-type estuary system in the Salish Sea, is home not only to incredible biodiversity but also to some very complex current systems and thermoclines. A particularly intriguing part of the Possession Sound fjord system is the extreme stratification of the halocline in certain areas. One such area can be found at the mouth of the Snohomish River, where cold freshwater from ice melts flows into warmer seawater, creating a stratified but unstable water column. As a result, very intricate temperature patterns can arise in this water system. Understanding the relationship between temperature and current speed throughout the water column is crucial to understanding how many other factors influence the local water system. This study aims to examine temporal patterns in the relationship between current speed and temperature at the mouth of the Snohomish River. Temperature data is collected from the Ocean Research College Academy's CTD mooring at the Everett Marina, and current speed data is collected from their ADCP in the same location. Previous studies conducted at ORCA suggest that during most parts of the tidal cycle, temperature readings at the surface correlate strongly with tidal stages, but when the tide cycle becomes less intense and current speeds decrease, this correlation disappears. It is hypothesized that this pattern represents a decrease in thermocline stratification during periods of slower current speeds. A major drawback of the study was its very narrow scope: only one month of continuous data was included. By expanding on prior research, this study will help contribute to a more complete understanding of the water column at the mouth of the Snohomish River.
