Presentation Title

Attribution of corrosive bottom-water conditions to ocean acidification and other estuarine drivers in Puget Sound: an updated analysis

Session Title

Session S-04A: Frontiers of Ocean Acidification Research in the Salish Sea

Conference Track

Ocean Acidification

Conference Name

Salish Sea Ecosystem Conference (2014 : Seattle, Wash.)

Contributing Repository

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

Start Date

1-5-2014 8:30 AM

End Date

1-5-2014 10:00 AM

Abstract

Providing specific attribution of observed changes in biogeochemical signals to specific process drivers is notoriously challenging in coastal and estuarine ecosystems, with natural variability often substantially larger than an anthropogenic signal of interest, such as ocean acidification (OA). In 2010, we estimated that anthropogenic OA was responsible for 24–49% of the added corrosiveness observed in the bottom waters of southern Hood Canal, relative to conditions naturally present in CO2-rich upwelling water, with the remaining 51–74% due to respiration processes. For these purposes, “added corrosiveness” referred to the contribution of additional dissolved CO2 from uptake of anthropogenic CO2 (i.e. anthropogenic OA) or respiration within Hood Canal to undersaturation of aragonite beyond that in the upwelled source waters. Here we expand this analysis to encompass five cruise data sets for Hood Canal (2008–2011). We also determine the CO2 variability of marine source waters coming into Puget Sound using moored time-series in combination with empirical relationships developed for coastal waters, as well as the impact of different transport-time scenarios within the basin on our attribution estimates.

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.

Language

English

Format

application/pdf

Type

Text

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May 1st, 8:30 AM May 1st, 10:00 AM

Attribution of corrosive bottom-water conditions to ocean acidification and other estuarine drivers in Puget Sound: an updated analysis

Room 615-616-617

Providing specific attribution of observed changes in biogeochemical signals to specific process drivers is notoriously challenging in coastal and estuarine ecosystems, with natural variability often substantially larger than an anthropogenic signal of interest, such as ocean acidification (OA). In 2010, we estimated that anthropogenic OA was responsible for 24–49% of the added corrosiveness observed in the bottom waters of southern Hood Canal, relative to conditions naturally present in CO2-rich upwelling water, with the remaining 51–74% due to respiration processes. For these purposes, “added corrosiveness” referred to the contribution of additional dissolved CO2 from uptake of anthropogenic CO2 (i.e. anthropogenic OA) or respiration within Hood Canal to undersaturation of aragonite beyond that in the upwelled source waters. Here we expand this analysis to encompass five cruise data sets for Hood Canal (2008–2011). We also determine the CO2 variability of marine source waters coming into Puget Sound using moored time-series in combination with empirical relationships developed for coastal waters, as well as the impact of different transport-time scenarios within the basin on our attribution estimates.