Climate change measuring instruments are on life support | John Abraham | Environment | guardian.co.uk
Take, for instance, ocean temperatures. Measurements from as far back as the 1700s were recorded, but they were sparse in coverage. Later, more systematic measurements of ocean waters were made with canvas buckets, then insulated buckets, and then using more and more advanced systems until today, when approximately 3,000 automated floats continuously record and transmit ocean temperatures. Splicing together these records from differing technologies is challenging and often gives misinterpretations of long-term trends.