The Pacific QDO as a Natural Predictor for the Great Salt Lake Elevation
نویسندگان
چکیده
The lake elevation of the Great Salt Lake (GSL), a large closed basin in the arid western United States, is characterized by a pronounced quasi-decadal oscillation (QDO) (Lall and Mann 1995). Wang et al. (2009a) found that the variation of the GSL elevation is very coherent with the QDO of sea surface temperature anomalies in the tropical central Pacific, known as the Pacific QDO (White and Liu 2008a, b). The Pacific QDO can be depicted by the SST anomalies in the NINO4 region (Allan 2000), denoted as ΔSST (NINO4). Fig. 1 illustrates the coherence between the GSL elevation and ΔSST (NINO4). However, such a coherence denies any direct association between the precipitation over the GSL watershed and the Pacific QDO because, in a given frequency, the precipitation variations always lead the GSL elevation variations. In other words, a direct link between the Pacific QDO and the precipitation source of the GSL is absent. What causes the GSL elevation to vary so coherently with ΔSST (NINO4) is therefore an intriguing question.
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