Buckets to blame for wartime temperature blip

"Prior to the war, UK and US fleets had contributed roughly equally to the global temperature record. From 1942 to 1945, UK ships, previously an important gatherer of sea water temperatures, were mobilised on the front and contributed just 5% of measurements. Measurements taken from US ships made up 80%.

The key, then, is how each nation took its measurements. UK ships tended to throw a bucket overboard and lift it on deck to take the water's temperature. US ships by and large would sample water drawn into the the engine room before it was used to cool the machinery."

http://environment.newscientist.com/article/dn14006-buckets-to-blame-for-wartime-temperature-blip.html?DCMP=ILC-hmts&nsref=news7_head_dn14006