Calculate seasonal amplitude from observations

[cahartin]

HOTS BATS ESTOC Flinders Reef Iceland Irminger

[cahartin]

[kdorheim]

So far I have only taken a look at one of obs data sets, but do we want to be looking at the in situ pH, spco2 and such or the calculated values?

[kdorheim]

So far I have really only looked at HOTS data but I am thinking this is going to be an issue in other observational data sets.

Most of the variables in HOTS do not have 12 observations in each year meaning that inter-annual amplitude may be underestimated in that specific year. (With HadGem models this caused wonky kurtosis and skewness values)

For the model observations we removed these years from the distribution and the problem was solved. If we do that with the obs data we end up discarding most of the data set. Instead of having a 12 month requirement do we want to impose a 9 month or 6 month requirement?

[kdorheim]

Potential gap filling methodology papers

• http://www.pnas.org/content/106/30/12235.full (where Dore et al 2009 got the methodology from)

[kdorheim]

@cahartin the Irminger sea data set (https://www.nodc.noaa.gov/archive/arc0093/0149098/1.1/data/0-data/) includes observations at various ocean depths. The min ocean depth value is 308 dB, does that count as surface data?

[cahartin]

i think 1db~1 meter, so then this would be at 300 meters. That's odd.....

[kdorheim]

@cahartin I printed out all of the cmip, CESM, and observation time series comparison plots and saved them in the attached pdf. Please let me know if you the de-trended time series as well.

cmip_observation_comparison_plots.pdf