Analysis of the main source regions of moisture transport events with the new ESA CCI/CM‐SAF total column water vapour climate data record (v2)

This study makes use of the new Total Column Vater Vapour Data Record (CDR-2 (v2)) —developed by European Space Agency (ESA) in coordination with Satellite Application Facility on Climate Monitoring (CM SAF)— to analyse adequacy integrated vertical water vapour column (IWV) data provided Centre for Medium-Range Weather Forecasts (ECMWF) ERA5 and ERA-Interim reanalyses regions critical interest moisture transport mechanisms. information is initialization models —both Eulerian Lagrangian— used main mechanisms predict future evolution events. Particularly, almost 40000 atmospheric river (AR) nocturnal low-level jet (NLLJ) events identified a global scale between 2002 2017, have been variability cited CDR-2, both terms bias observed values IWV during each particular event, daily temporal correlation fields. Although some notable discrepancies are reported tropical rainforest regions, it that high ARs NLLJs, degree agreement CDR-2 high. The generally low, fields above 0.8 most areas. appears show slightly better performance than when resolving column, greater similarity mid-latitudes compared regions. probability density functions constructed event-to-event basis reinforce these ideas. We conclude here presented evaluations using serve strengthen avaliable evidence ECMWF can be safely initializations Lagrangian dispersion tracer simulations —commonly analysis advection mechanisms— vast majority LLJs. They also detection source-sink hydrological cycle