Their term «
uncorrected instrumental biases» implies that those biases are somehow correctable, to the point of zero uncertainty, that's where they go wrong.
We argue that the abrupt temperature drop of 0.3 C in 1945 is the apparent result of
uncorrected instrumental biases in the sea surface temperature record.
We argue that the abrupt temperature drop of ~ 0.3 °C in 1945 is the apparent result of
uncorrected instrumental biases in the sea surface temperature record [since it is only apparent in SSTs].