Nature - USA (2019-07-18)

Letter reSeArCH

100 101 102 103 104 105

Random and ship-level errors for averaged SST differences (

oC

2 )

10 -4

10 -3

10 -2

10 -1

100

101

Number of averaged measurements

rnd

(^2) = 0.86
shp
(^2) = 0.38 x = 0.57
rnd
(^2) = 0.42
shp
(^2) = 0.80 x = 0.65
Empirical estimates (ref.10)
Empirical estimates (This study)
̃ ̃
̃ ̃
Extended Data Fig. 10 | Partitioning of random and systematic errors.
Updating the methodology for identifying nationality allows more groups
of SSTs to be compared, and leads to minor changes in estimated random
and systematic errors. Shown are fits according to equation (6) in ref.^10 ,
depending on random measurement error (σrnd^2 ), systematic ship-level
error (σshp^2 ), and the scaling relationship between the number of
measurements and ships (x). Fits are performed using logarithms, and
shading indicates 2 s.d. in logarithmic space.