Another question, Dara. Exactly what time period do you use for your Darwin and Tahiti data? I'm a bit worried because of how the red line shoots down at the right end here:



If you look at the air pressure data files you sent me, the Darwin file ends like this:

~~~~
2012 6.0 7.2 6.3 10.7 11.3 13.3 12.8 14.0 12.2 10.8 9.3 7.7
2013 5.8 7.2 7.2 9.7 10.8 11.2 12.5 13.1 11.6 10.7 7.7 7.7
2014 5.0 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9
2015 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9 -99.9
~~~~

while Tahiti ends like this:

~~~~
2012 12.4 12.3 10.8 12.2 12.6 13.2 13.5 14.9 15.0 14.1 12.8 10.0
2013 10.0 11.0 13.2 12.1 13.5 14.1 14.7 14.7 14.6 13.3 -99.9 -99.9
~~~~

The number -99.9 means "no data". But if you don't stop your data analysis in October 2013, you'll get some large negative values for the air pressure!