The Atlantic Multidecadal Variability Phase Dependence of Teleconnection between the North Atlantic Oscillation in February and the Tibetan Plateau in March
نویسندگان
چکیده
Abstract The Tibetan Plateau (TP), referred to as the “Asian water tower,” contains one of largest land ice masses on Earth. local glacier shrinkage and frozen-water storage are strongly affected by variations in surface air temperature over TP (TPSAT), especially springtime. This study reveals that relationship between February North Atlantic Oscillation (NAO) March TPSAT is unstable with time regulated phase multidecadal variability (AMV). significant out-of-phase connection occurs only during warm AMV (AMV+). results show AMV+, negative NAO persists from March, accompanied a quasi-stationary Rossby wave train trapped along northward-shifted subtropical westerly jet stream across Eurasia, inducing an anomalous adiabatic descent warms TP. However, cold AMV, cannot persist into March. propagates well-separated polar jets, NAO–TPSAT broken. Further investigation suggests enhanced synoptic eddy low-frequency flow (SELF) interaction caused southward-shifted storm track, helps maintain pattern via positive feedback. provides new detailed perspective decadal Atlantic–TP late winter early spring.
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ژورنال
عنوان ژورنال: Journal of Climate
سال: 2021
ISSN: ['1520-0442', '0894-8755']
DOI: https://doi.org/10.1175/jcli-d-20-0157.1