A comparison of correction factors for the systematic gauge-measurement errors to improve the global land precipitation estimate

Precipitation gauges are critical for assessing precipitation measurements at regional and global scales often used to adjust estimates from other instruments such as satellites. However, gauge-measured is affected by gauge-undercatch that larger solid precipitation. In the present work, two popular correction factors (CFs) were compared: one utilizes a dynamic model in Global Climatology Centre (GPCC) Monitoring product employs fixed monthly climatologies Project (GPCP) product. How choice of CFs impacts total was quantified over land seasonal, annual, regional, scales. The also compared function environmental variables their development near-surface air temperature, relative humidity, wind speed. Results showed annual estimate (with no correction) can be biased ? 9.61% (excluding Antarctica), although it varied depending on season (from 6.80% boreal summer more than 12.33% winter), method correction. Interannual variations large, so use climatology requires caution. Given magnitudes differences, choosing appropriate has important implications refining water energy budget calculations.