60-year trends of δ18O in global precipitation reveal large scale hydroclimatic variations

摘要: Abstract Sixty years of monthly data series δ18O in precipitation revealed distinctive decadal long-term patterns and break points for the isotope composition global precipitation. Our results showed that at multi-decadal scale, displayed changes due to large-scale hydroclimate processes, particularly, from atmospheric oscillations. Break point segmented regression trend analyses air temperature influences North Atlantic Oscillation (NAO) on variability most continental stations Northern Hemisphere. Long-term trends amount Southern Hemisphere were mostly indicative regional processes driven by larger scale Pacific For oceanic island stations, variations could be described sinusoidal with a ~ 20–40 years-time cycle amplitude ~1–2‰, suggesting these have a higher sensitivity circulation. findings reveal coordinated monitoring stable isotopes precipitation, coupled basic meteorological parameters such as amount, are essential better understand impact variation local climate variability, help interpret hydroclimatic past, present future.