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Several ice cores have been recovered from the Dasuopu(DSP) Glacier and the East Rongbuk (ER) Glacier in the central Himalayassince the 1990s. Although the distance between the DSP and the ER ice coredrilling sites is only ~ 125 km, the stable isotopic record(δ<sup>18</sup>O or δD) of the DSP core is interpreted in previousstudies as a temperature proxy, while the ER core is interpreted as a precipitation proxy.Thus, the climatological significance of the stable isotopic records ofthese Himalayan ice cores remains a subject of debate. Based on analysis ofregional precipitation patterns over the region, we find that remarkablediscrepancy in precipitation seasonality between the two sites may accountfor their disparate isotopic interpretations. At the ER core site, theIndian summer monsoon (ISM) precipitation is dominating due to topographicblocking of the moisture from westerlies by the high ridges of Mt. Qomolangma(Everest), which results in a negative correlation between the ER Δ<sup>18</sup>O or δD record and precipitation amount along the southernslope of the central Himalayas in response to the "amount effect". At theDSP core site, in comparison with the ISM precipitation, the wintertimeprecipitation associated with the westerlies is likely more important owingto its local favorable topographic conditions for interacting with thewestern disturbances. Therefore, the DSP stable isotopic record may beprimarily controlled by the westerlies. Our results have importantimplications for interpreting the stable isotopic ice core records recoveredfrom different climatological regimes of the Himalayas

Influence of regional precipitation patterns on stable isotopes in ice cores from the central Himalayas