How representative are FLUXNET measurements of surface fluxes during temperature extremes

摘要: Abstract. In response to a warming climate, temperature extremes are changing in many regions of the world. Therefore, understanding how fluxes sensible heat, latent heat and net ecosystem exchange respond contribute these changes is important. We examined 216 sites from open access Tier 1 FLUXNET2015 free fair-use La Thuile data sets, focussing only on observed (non-gap-filled) data periods. examined the availability exchange observations coincident time with measured temperature for all temperatures, separately upper lower tail temperature distribution, expressed this as measurement ratio. We showed that ratios both fluxes are generally (0.79 0.73 respectively) than temperature measurements, ratio exchange measurements appreciably (0.42). However, sites do exist a high proportion fluxes, mostly over the United States, Europe Australia. Few have high of measured at distribution very cold (e.g. Alaska, Russia) or warm regions (e.g. Central America majority Mediterranean region), many of world's coldest hottest not represented freely available FLUXNET all India, Gulf Greenland and Antarctica). some provide extreme temperatures, suggesting an opportunity community share strategies increase tails the temperature distribution. also highlight wide discrepancy between the measurement across related actual temperature rainfall regimes site, which we cannot explain. Our analysis provides guidance help select eddy covariance for researchers interested understanding and/or modelling responses to temperature extremes.