| Title | A late Pleistocene-Holocene noble gas paleotemperature record in southern Michigan |
| Publication Type | Journal Article |
| Year of Publication | 2004 |
| Authors | Ma L., Castro M.C, Hall C.M |
| Journal | Geophysical Research Letters |
| Volume | 31 |
| Issue | 23 |
| Pagination | 1-24 |
| Date Published | Dec 9 |
| ISSN | 0094-8276 |
| Accession Number | WOS:000225878800006 |
| Abstract | Noble gas temperatures (NGTs) and C-14 derived ages in groundwaters of the Michigan Basin reveal a ground temperature of similar to1degreesC 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 similar to12.8 and 11.1 kyrs BP, correlative to the Bolling-Allerod (BOA) warm phases. Ice-sheet-linked changes in freshwater delivery to the North Atlantic, together with changes in the North Atlantic Deep Water (NADW) circulation are possible causes of such abrupt climate shifts in northeastern US. Pleistocene waters yielding the lowest NGTs have the highest delta(18)O and deltaD values, suggesting an atmospheric circulation pattern distinct from today, with a stronger moisture component from the Gulf of Mexico, possibly due to the presence of the LIS which weakened the Pacific westerly flow. |
| DOI | 10.1029/2004GL021766 |
