Page 7 - NutrientsReadMe
P. 7
A second source of error in this dataset apparently arises from 0 and 20 m samples at a
particular location being occasionally misrecorded as the other. Surface nutrients, especially
in summer, are known to be often close to zero, and hence much lower than those at 20 m.
However, in each year a small number of stations apparently shows the reverse - with near-
zero nitrate concentrations at 20 m, but relatively high concentrations at 0 m.
After careful consideration, some of these are assumed to occur due to human errors in the
sampling/logging process and are "corrected". In 2020 an improved colour-coding system of
labelling for samples from different depths was instituted, and the number of these corrections
dropped from about 20 in each year to one or two.
Writing a log sheet. Labelling on nutrient sampling vials
