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2024/08/30/paper-1-draft-plots-ctd #23

Open utterances-bot opened 2 weeks ago

utterances-bot commented 2 weeks ago

Paper 1 Draft Plots (Continued) | Dakota’s Research Blog

Goals From Last Meeting: Work on integrating new KC data + Ecology historical into LO - README + Parker review. Follow up with Metro Vancouver. Contact Christopher Krembs (Ecology) for data discussion. Homeworks! Further investigate trends using different statistical methods (e.g., bootstrapping). Continue to investigate correlations with Skagit flow and other environmental variables (ref. Banas MacCready Long Live the Kings report). Start thinking about Parker’s website update on trends. List of Paper 1 potential discussion topics. Paper 1 draft plot updates. CID uniqueness bug fix. Completed Goals: Paper draft plot updates - time series averages, modern trends vs. historic trends, surface DO saturation vs. deep DO, and seasonal skagit flow

https://dakotamm.github.io/2024/08/30/paper-1-draft-plots-ctd.html

parkermac commented 2 weeks ago

Nice work. For Fig. 8 does "surface saturation" mean that you took to potential temperature and salinity of the deep water, calculated to DO saturation value for it, and then calculated the trend of that?

dakotamm commented 1 week ago

Hi Parker! I'm calculating surface saturation using the potential temperature and salinity for the SURFACE water, calculating the DO saturation value, and then calculating the trend! Would you recommend using the dep water instead?

parkermac commented 1 week ago

I would recommend using the potential temperature and salinity of the deep water. The idea is that you assume the water parcel at some point was in contact with the atmosphere, and that it came into equilibrium with the atmosphere in terms of oxygen concentration. Since the atmosphere has a lot (20%) of oxygen, the value in seawater is always limited by saturation (instead of being limited by the concentration in the atmosphere). Then we assume that the water got advected to some depth, and along the way its oxygen was used up a bit by respiration, but it maintained the same potential temperature and salinity. We sometimes call the difference between the saturation DO and the actual DO the "apparent oxygen utilization". In any case, you should be using the deep water values to calculate saturation DO when comparing to the actual deep water DO.

On Tue, Sep 3, 2024 at 10:12 AM Dakota Mascarenas @.***> wrote:

Hi Parker! I'm calculating surface saturation using the potential temperature and salinity for the SURFACE water, calculating the DO saturation value, and then calculating the trend! Would you recommend using the dep water instead?

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Parker MacCready

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Research Professor, School of Oceanography I live and work on the land and waters of the Squaxin Island Tribe. Email: p @.>.@. (do not use @.** except for UW email) URL: faculty.washington.edu/pmacc LiveOcean Daily Forecasts http://faculty.washington.edu/pmacc/LO/LiveOcean.html Cell: (360) 359-1936, Office: (206) 685-9588 pronouns: he/him*