Box size is 111x111km, time bin is 1 month.

Thus, for each box having both CTD/Bottle and XBT data a total temperature XBT bias is defined simply as a difference between box-averaged CTD and XBT temperatures.

Averaging all box-biases within a year gives a yearly-mean total XBT temperature bias at a respective level.

The implemented bias model implies that the total XBT temperature bias is a sum of a "pure" temperature bias (depth-independent) and a bias due to the depth-variable depth error in the presence of a non-zero vertical temperature gradient.

Data:
Files tbias_xxxx.txt contain "pure" temperature bias to be substracted from the original XBT profiles.

Files depth_corr_xxxx.txt contain depth corrections to be added to the original XBT depths (original depths are those obtained from the Sippican Fall-Rate-Equation).

gouretski_tbias_t4t6.txt
gouretski_depth_corr_t4t6.txt
gouretski_tbias_t5.txt
gouretski_depth_corr_t5.txt
gouretski_tbias_t7db.txt
gouretski_depth_corr_t7db.txt

Note: Due to data limitations, corrections are defined between 1970 and 2000 for T4, T6, T7 and Deep-Blue XBT types, and between 1980 and 2000 for the T5 probes.