Age determination and radiometric dates of cores from Okarito Pakihi in Australia
Fuente:
PANGAEA
Gespeichert in:
| Hauptverfasser: | , , , , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Sprache: | en |
| Veröffentlicht: |
PANGAEA
2005
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1867167663446294528 |
|---|---|
| author | Vandergoes, Marcus J Newnham, Rewi M Preusser, Frank Hendy, Chris H Lowell, Thomas V Fitzsimons, Sean J Hogg, Alan G Kasper, Haino Uwe Schlüchter, Christian |
| author_facet | Vandergoes, Marcus J Newnham, Rewi M Preusser, Frank Hendy, Chris H Lowell, Thomas V Fitzsimons, Sean J Hogg, Alan G Kasper, Haino Uwe Schlüchter, Christian |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In agreement with the Milankovitch orbital forcing hypothesis (Imbrie et al., 1993) it is often assumed that glacial-interglacial climate transitions occurred synchronously in the Northern and Southern hemispheres of the Earth. It is difficult to test this assumption, because of the paucity of long, continuous climate records from the Southern Hemisphere that have not been dated by tuning them to the presumed Northern Hemisphere signals (Lynch-Stieglitz, 2004). Here we present an independently dated terrestrial pollen record from a peat bog on South Island, New Zealand, to investigate global and local factors in Southern Hemisphere climate changes during the last two glacial-interglacial cycles. Our record largely corroborates the Milankovitch model of orbital forcing but also exhibits some differences: in particular, an earlier onset and longer duration of the Last Glacial Maximum. Our results suggest that Southern Hemisphere insolation may have been responsible for these differences in timing. Our findings question the validity of applying orbital tuning to Southern Hemisphere records and suggest an alternative mechanism to the bipolar seesaw for generating interhemispheric asynchrony in climate change. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_738441 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age determination and radiometric dates of cores from Okarito Pakihi in Australia Vandergoes, Marcus J Newnham, Rewi M Preusser, Frank Hendy, Chris H Lowell, Thomas V Fitzsimons, Sean J Hogg, Alan G Kasper, Haino Uwe Schlüchter, Christian HAND; Okarito_Pakihi; Sampling by hand In agreement with the Milankovitch orbital forcing hypothesis (Imbrie et al., 1993) it is often assumed that glacial-interglacial climate transitions occurred synchronously in the Northern and Southern hemispheres of the Earth. It is difficult to test this assumption, because of the paucity of long, continuous climate records from the Southern Hemisphere that have not been dated by tuning them to the presumed Northern Hemisphere signals (Lynch-Stieglitz, 2004). Here we present an independently dated terrestrial pollen record from a peat bog on South Island, New Zealand, to investigate global and local factors in Southern Hemisphere climate changes during the last two glacial-interglacial cycles. Our record largely corroborates the Milankovitch model of orbital forcing but also exhibits some differences: in particular, an earlier onset and longer duration of the Last Glacial Maximum. Our results suggest that Southern Hemisphere insolation may have been responsible for these differences in timing. Our findings question the validity of applying orbital tuning to Southern Hemisphere records and suggest an alternative mechanism to the bipolar seesaw for generating interhemispheric asynchrony in climate change. |
| title | Age determination and radiometric dates of cores from Okarito Pakihi in Australia |
| topic | HAND; Okarito_Pakihi; Sampling by hand |
| url | https://doi.org/10.1594/PANGAEA.738441 |