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Middle to Late Holocene lake level variations recorded by shoreline tufa of Longmu Co Lake, northwestern Tibet Plateau.
- Source :
- Holocene; Sep2024, Vol. 34 Issue 9, p1242-1251, 10p
- Publication Year :
- 2024
-
Abstract
- Tufa deposits have significant potential for reconstructing past lake-level fluctuations. Here, we conducted U-Th dating of tufa deposits exposed along the shoreline of Longmu Co Lake in the northwestern Tibetan Plateau to reconstruct its water level history during the middle-late Holocene. Our data demonstrate that Longmu Co Lake reached its highest level (61 m above the present level) at around 7.4 ka in response to the strengthened Indian Summer Monsoon and increased glacial meltwater; its lake level subsequently decreased due to solar insolation-induced decline in summer monsoon and glacial meltwater. Moreover, we find that the lake level experienced an abrupt decline at ~2.2 ka with a maximum amplitude of 13 m, probably owing to the rapid cooling of the local climate. The δ<superscript>18</superscript>O and δ<superscript>13</superscript>C of Longmu Co tufa also show a covariance trend, which supports the regional climate change reflected by the lake level fluctuation of Longmu Co. Additionally, we observed an inverse correlation between initial δ<superscript>234</superscript>U content in tufa and lake level variation, suggesting that initial calcium δ<superscript>234</superscript>U can serve as a proxy for reconstructing environmental changes. Our study therefore implies that lake tufa as a reliable archive for accurately reconstructing lake level changes. [ABSTRACT FROM AUTHOR]
- Subjects :
- WATER levels
TUFAS
INVERSE relationships (Mathematics)
MELTWATER
HOLOCENE Epoch
Subjects
Details
- Language :
- English
- ISSN :
- 09596836
- Volume :
- 34
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Holocene
- Publication Type :
- Academic Journal
- Accession number :
- 179974157
- Full Text :
- https://doi.org/10.1177/09596836241254474