Combined effects of the Pacific Decadal Oscillation and El Nino-Southern Oscillation on global land dry-wet changes.

ABSTRACT: The effects of natural variability, especially El Niño-Southern Oscillation (ENSO) effects, have been the focus of several recent studies on the change of drought patterns with climate change. The interannual relationship between ENSO and the global climate is not stationary and can be modulated by the Pacific Decadal Oscillation (PDO). However, the global land distribution of the dry-wet changes associated with the combination of ENSO and the PDO remains unclear. In the present study, this is investigated using a revised Palmer Drought Severity Index dataset (sc_PDSI_pm). We find that the effect of ENSO on dry-wet changes varies with the PDO phase. When in phase with the PDO, ENSO-induced dry-wet changes are magnified with respect to the canonical pattern. When out of phase, these dry-wet

SUBMITTER: Wang S 

PROVIDER: S-EPMC4200402 | biostudies-literature | 2014 Oct

REPOSITORIES: biostudies-literature