Orbital modulation of subtropical versus subantarctic moisture sources in the southeast Pacific mid-latitudes.

ABSTRACT: Reconstructing rainfall variability and moisture sources is a critical aspect to understand past and future hydroclimate dynamics. Here, we use changes in the deuterium content of land-plant leaf waxes from two marine sediment cores located off Chile to reconstruct changes in rainfall amount and variation in moisture sources over the last ~50 ka. The records indicate increased moisture in central Chile during precession maxima, but an obliquity modulation is evident in southern Chile. While the southern westerly winds are the dominant factor of precipitation in southern Chile by bringing moisture and perturbations from the extratropics, the subtropics represent an additional moisture source during precession maxima due to a stronger subtropical jet increasing moisture transport from the tr

SUBMITTER: Kaiser J 

PROVIDER: S-EPMC11362560 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature