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The potential of oxygen isotopes in diatoms as a palaeoclimate indicator in lake sediments.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lamb, Angela L. Leng, Melanie J. Barker, Philip Alfred Morley, David |
| Copyright Year | 2004 |
| Abstract | PAGES NEWS, VOL.12, N°1, APRIL 2004 fall years (~40%) observed in AISRTS are registered in the stalagmite, while most of the excess rainfall years (~86%) are recorded. A possible reason could be the proximity of the cave site to the coast, which would ensure that there were frequent rains due to orographic uplifting of clouds. Hence, a defi ciency of rain may not have been experienced at the cave site despite a defi ciency at inland sites. It also suggests that the cave site experienced only those defi cient years during which the southwest monsoon system was severely weakened. Hence, regional variations in past rainfall may be responsible for the absence of some of the extreme rainfall events in the stalagmite. Rainfall Before Instrumental Record (before AD 1813) Low rainfall events DR7 and DR8 may coincide with the devastating droughts recorded during 1777 and 1796. Other events such as DR1 to DR6 should indicate extremely dry years. Growth in the stalagmite most probably took place when rainfall was high (near ER-1; ~1666). A peculiar feature of the rainfall reconstruction is that none of the defi cient rainfall conditions observed before 1800 are comparable in magnitude to the defi cient years that occurred around 1900. However, the average rainfall before ~1930 did remain lower than that during 19301996. In the reconstruction, all the defi cient years (except 1892) and all the excess years (except 1967 and 1905) correlate with similar events in AISRTS. This suggests that there is a high possibility that the extreme events shown by ER1 to ER4 and DR1 to DR8 occurred countrywide. |
| Starting Page | 6 |
| Ending Page | 8 |
| Page Count | 3 |
| File Format | PDF HTM / HTML |
| DOI | 10.22498/pages.12.1.6 |
| Alternate Webpage(s) | http://www.pastglobalchanges.org/download/docs/newsletter/2004-1/science_highlights/Lamb_etal_2004-1(6-8).pdf |
| Alternate Webpage(s) | https://doi.org/10.22498/pages.12.1.6 |
| Volume Number | 12 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
