期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 9, 页码 3220-3226出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059748
关键词
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资金
- WaterSMART [R13AC80039]
- Utah Agricultural Experiment Station [8652]
- Office of Science of the U.S. Department of Energy (DOE) as part of the Earth System Modeling program
- DOE by Battelle Memorial Institute [DEAC05-76RLO1830]
- National Science Foundation
- Office of Science of the DOE
- [NNX13AC37G]
The 2013-2014 California drought was initiated by an anomalous high-amplitude ridge system. The anomalous ridge was investigated using reanalysis data and the Community Earth System Model (CESM). It was found that the ridge emerged from continual sources of Rossby wave energy in the western North Pacific starting in late summer and subsequently intensified into winter. The ridge generated a surge of wave energy downwind and deepened further the trough over the northeast U. S., forming a dipole. The dipole and associated circulation pattern is not linked directly with either El Nino-Southern Oscillation (ENSO) or Pacific Decadal Oscillation; instead, it is correlated with a type of ENSO precursor. The connection between the dipole and ENSO precursor has become stronger since the 1970s, and this is attributed to increased greenhouse gas loading as simulated by the CESM. Therefore, there is a traceable anthropogenic warming footprint in the enormous intensity of the anomalous ridge during winter 2013-2014 and the associated drought.
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