Noble gases and stable isotopes in a shallow aquifer in southern Michigan: Implications for noble gas paleotemperature reconstructions for cool climates
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Noble gases and stable isotopes in a shallow aquifer in southern Michigan: Implications for noble gas paleotemperature reconstructions for cool climates
[1] Noble gas data from the Glacial Drift, the shallowest aquifer in southern Michigan confirm findings by Ma et al. (2004) that modern noble gas temperatures (NGTs) are systematically below the current mean annual air temperature (MAAT) which, in turn, is similar to the ground temperature of these recharge waters. By tracking noble gas concentrations as well as stable isotope ratios through an...
متن کاملReply to comment by Klump et al. on ‘‘Noble gases and stable isotopes in a shallow aquifer in southern Michigan: Implications for noble gas paleotemperature reconstructions for cool climates’’
[1] In their comment, Klump et al. [2006], hereinafter referred to as KBK, make three main points concerning Hall et al. [2005]: (1) that the model of excess air that accounts for fractionation via the mechanism of diffusive loss should have produced significant changes from normal isotopic ratios; (2) the suggestion that the presence of excess He in the gas phase in the unsaturated zone is inc...
متن کاملA late Pleistocene–Holocene noble gas paleotemperature record in southern Michigan
[1] Noble gas temperatures (NGTs) and C derived ages in groundwaters of the Michigan Basin reveal a ground temperature of 1 C toward the end of the Last Glacial Maximum (LGM) suggesting that groundwater recharge occurred under the Laurentide Ice Sheet (LIS) cover. In addition to the general warming observed since the LGM, the NGT record indicates an abrupt warming event between 12.8 and 11.1kyr...
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Evaluation of noble gas recharge temperatures in a shallow unconfined aquifer.
Water table temperatures inferred from dissolved noble gas concentrations (noble gas temperatures, NGT) are useful as a quantitative proxy for air temperature change since the last glacial maximum. Despite their importance in paleoclimate research, few studies have investigated the relationship between NGT and actual recharge temperatures in field settings. This study presents dissolved noble g...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2005
ISSN: 0094-8276
DOI: 10.1029/2005gl023582