Abstract
The difference between precipitation and evaporation has been
extensively used to characterize the water cycle’s response to global
warming. However, when it comes to the global scale, the information
provided by this metric is inconclusive. Herein, we discuss how the sum
of precipitation and evaporation could complement the assessment of
global water cycle intensification. To support our argument, we present
a brief yet robust correlation analysis of both metrics in four
reanalysis data sets (20CR v3, ERA-20C, ERA5, and NCEP/NCAR R1).
Additionally, by combining the two metrics, we investigate how well the
global water cycle fluxes are represented in the four reanalyses. Among
them, we observe four different responses to the temperature increase
between 1950-2010, with ERA5 showing the best agreement with the
intensification hypothesis. We argue that these discrepancies would
remain elusive with the traditional approach, which makes the
utilization of the sum of precipitation and evaporation a valuable
addition to our methodological toolbox for the assessment of the global
water cycle intensification.