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Table 1 Observational data products used to characterise observational monitoring density around the globe. The decorrelation radius is also given for each variable (New et al. 2000)

From: Rapid systematic assessment of the detection and attribution of regional anthropogenic climate change

Climate variable Station density data set Decorrelation radius (km)
2 m air temperature CRU TS 3.22 (Harris et al. 2014) 1200
Precipitation CRU TS 3.22 (Harris et al. 2014) 450
Sea surface temperature HadSST3.1.1.0 (Kennedy et al. 2011a, b) 1200