Presentation Abstract

More than a decade of high-resolution, full-water column data collected by profiling UW ORCA/NANOOS moorings in several Puget Sound Basins are used to investigate interannual variability of near-surface and deep water properties. Although there are no significant trends in temperature, salinity, density and dissolved oxygen spanning the last decade, measurements show steady and relatively strong trends in these variables over periods of 3 to 5 years in both South Sound near bottom waters and in south Hood Canal deep water. For example, the annual minimum density in south Hood Canal deep water increased four years in a row from 2006 to 2009, then this trend reversed for three years. In Carr Inlet the annual maximum deep temperature increased five years in a row from 2011 to 2015, with deep salinity following a similar trend. As these trends are significantly longer than expected flushing and residence times (< year), this hints at potential interannual dynamical feedbacks, longer-term system “memory”, and/or similar trends in ocean and atmospheric forcing. Using archived National Data Buoy Center, National Weather Service and UW Atmospheric Sciences data we explore and report on potential factors contributing to these trends.

Session Title

Response of Water-Column Processes and Pelagic Organisms to Long-term Change

Keywords

Puget Sound

Conference Track

SSE16: Long-Term Monitoring of Salish Sea Ecosystems

Conference Name

Salish Sea Ecosystem Conference (Seattle, WA : 2018)

Document Type

Event

SSEC Identifier

SSE16-613

Start Date

5-4-2018 4:00 PM

End Date

5-4-2018 4:15 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, 4:00 PM Apr 5th, 4:15 PM

Does Puget Sound have a long-term memory?

More than a decade of high-resolution, full-water column data collected by profiling UW ORCA/NANOOS moorings in several Puget Sound Basins are used to investigate interannual variability of near-surface and deep water properties. Although there are no significant trends in temperature, salinity, density and dissolved oxygen spanning the last decade, measurements show steady and relatively strong trends in these variables over periods of 3 to 5 years in both South Sound near bottom waters and in south Hood Canal deep water. For example, the annual minimum density in south Hood Canal deep water increased four years in a row from 2006 to 2009, then this trend reversed for three years. In Carr Inlet the annual maximum deep temperature increased five years in a row from 2011 to 2015, with deep salinity following a similar trend. As these trends are significantly longer than expected flushing and residence times (< year), this hints at potential interannual dynamical feedbacks, longer-term system “memory”, and/or similar trends in ocean and atmospheric forcing. Using archived National Data Buoy Center, National Weather Service and UW Atmospheric Sciences data we explore and report on potential factors contributing to these trends.