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Mid-Late Holocene Stalagmite δ18O and δ13C Records in Naduo Cave, Guizhou Province, China.
- Source :
- Journal of Chemistry; 11/24/2021, p1-11, 11p
- Publication Year :
- 2021
-
Abstract
- Global warming and climate anomalies have attracted worldwide attention. The study of global climate change has received increasing attention from all countries and fields worldwide. Paleoclimate research is an important way to understand past global change and environmental evolution and to simulate and predict future climate development. A stalagmite ND3 collected in Naduo Cave was used to reconstruct the history of local climate and environmental changes from 0.55 to 5.07 ka BP based on the data of 13 <superscript>230</superscript>Th ages and 642 groups of oxygen and carbon stable isotopes. First, according to correlation analysis, δ<superscript>18</superscript>O and δ<superscript>13</superscript>C were significantly correlated (correlation coefficient r = 0.308, n = 318, P < 0.001) during the 5.07–2.00 ka BP period. However, during the period of 2–0.55 ka BP, there was no significant correlation P > 0.05 . The δ<superscript>18</superscript>O and δ<superscript>13</superscript>C data indicate that the climatic environment changed asynchronously during the period of 2.00–0.55 ka BP. During the period of 5.07–2.00 ka BP, the influence of human activities was weak, and δ<superscript>18</superscript>O and δ<superscript>13</superscript>C indicate similar climatic and environmental conditions, both of which changed in the same direction (positive correlation). In other words, when δ<superscript>18</superscript>O was positive, it indicated weak summer monsoons and lower precipitation, which led to declines in vegetation, weakened biological activity, and decreased soil CO<subscript>2</subscript> and positive δ<superscript>13</superscript>C. The reverse patterns were also true. Since 2.0 ka BP, the intensity of human activities and the transformation and influence of surface vegetation have increased, and native vegetation has been destroyed in large quantities. Therefore, the climatic and environmental significance indicated by δ<superscript>13</superscript>C and δ<superscript>18</superscript>O has been well demonstrated. Second, the δ<superscript>18</superscript>O records showed that stalagmite ND3 responded to the weak monsoon drought events of 4.2 ka BP and 2.8 ka BP in the Holocene in a discontinuous deposition manner, which brings up new directions for future research. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20909063
- Database :
- Complementary Index
- Journal :
- Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 153761509
- Full Text :
- https://doi.org/10.1155/2021/7624833