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Rapid climate fluctuations over the past millennium: evidence from a lacustrine record of Basomtso Lake, southeastern Tibetan Plateau.

Li K, Liu X, Herzschuh U, Wang Y - Sci Rep (2016)

Bottom Line: At the centennial time scale, the Medieval Climate Anomaly (MCA), Little Ice Age (LIA) and Current Warm Period (CWP) are distinct in the Basomtso region.These episodes with higher and lower sediment input are characterized by abrupt climate changes and short time durations.Spectral analysis indicates that the climate variations at the centennial scale on the southeastern Tibetan Plateau are influenced by solar activity during the past millennium.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.

ABSTRACT
Abrupt climate changes and fluctuations over short time scales are superimposed on long-term climate changes. Understanding rapid climate fluctuations at the decadal time scale over the past millennium will enhance our understanding of patterns of climate variability and aid in forecasting climate changes in the future. In this study, climate changes on the southeastern Tibetan Plateau over the past millennium were determined from a 4.82-m-long sediment core from Basomtso Lake. At the centennial time scale, the Medieval Climate Anomaly (MCA), Little Ice Age (LIA) and Current Warm Period (CWP) are distinct in the Basomtso region. Rapid climate fluctuations inferred from five episodes with higher sediment input and likely warmer conditions, as well as seven episodes with lower sediment input and likely colder conditions, were well preserved in our record. These episodes with higher and lower sediment input are characterized by abrupt climate changes and short time durations. Spectral analysis indicates that the climate variations at the centennial scale on the southeastern Tibetan Plateau are influenced by solar activity during the past millennium.

No MeSH data available.


Related in: MedlinePlus

Spectral Analysis results for the LOI record from Basomtso Lake over the past millennium.Peaks are labelled with their periods in years above 95% confidence level.
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f4: Spectral Analysis results for the LOI record from Basomtso Lake over the past millennium.Peaks are labelled with their periods in years above 95% confidence level.

Mentions: The LOI is significantly correlated with the TOC (r = 0.69, p < 0.001, n = 118), TN (r = 0.78, p < 0.001, n = 118), coarse silt (r = 0.25, p < 0.001, and n = 479) and MS levels (r = 0.11, p < 0.015, n = 479). We therefore used the LOI to perform spectral analysis. The result indicates a significant low frequency variability of 113–120 years (>95% confidence level) (Fig. 4), which is similar to that detected in climate reconstructions from the TP1337 and the Arabian Sea41. A cycle of 113–120 years has been reported in total solar irradiation (TSI) data derived from sunspot numbers42, as well as 10Be and 14C data43, and may be correlated with a Gleissberg cycle of solar activity1344. Variations of solar irradiation have a considerable influence on the climate over the continents in the Northern Hemisphere124245. Therefore, the climate variations in Basomtso Lake may be related to changes in solar activity during the past millennium.


Rapid climate fluctuations over the past millennium: evidence from a lacustrine record of Basomtso Lake, southeastern Tibetan Plateau.

Li K, Liu X, Herzschuh U, Wang Y - Sci Rep (2016)

Spectral Analysis results for the LOI record from Basomtso Lake over the past millennium.Peaks are labelled with their periods in years above 95% confidence level.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835813&req=5

f4: Spectral Analysis results for the LOI record from Basomtso Lake over the past millennium.Peaks are labelled with their periods in years above 95% confidence level.
Mentions: The LOI is significantly correlated with the TOC (r = 0.69, p < 0.001, n = 118), TN (r = 0.78, p < 0.001, n = 118), coarse silt (r = 0.25, p < 0.001, and n = 479) and MS levels (r = 0.11, p < 0.015, n = 479). We therefore used the LOI to perform spectral analysis. The result indicates a significant low frequency variability of 113–120 years (>95% confidence level) (Fig. 4), which is similar to that detected in climate reconstructions from the TP1337 and the Arabian Sea41. A cycle of 113–120 years has been reported in total solar irradiation (TSI) data derived from sunspot numbers42, as well as 10Be and 14C data43, and may be correlated with a Gleissberg cycle of solar activity1344. Variations of solar irradiation have a considerable influence on the climate over the continents in the Northern Hemisphere124245. Therefore, the climate variations in Basomtso Lake may be related to changes in solar activity during the past millennium.

Bottom Line: At the centennial time scale, the Medieval Climate Anomaly (MCA), Little Ice Age (LIA) and Current Warm Period (CWP) are distinct in the Basomtso region.These episodes with higher and lower sediment input are characterized by abrupt climate changes and short time durations.Spectral analysis indicates that the climate variations at the centennial scale on the southeastern Tibetan Plateau are influenced by solar activity during the past millennium.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.

ABSTRACT
Abrupt climate changes and fluctuations over short time scales are superimposed on long-term climate changes. Understanding rapid climate fluctuations at the decadal time scale over the past millennium will enhance our understanding of patterns of climate variability and aid in forecasting climate changes in the future. In this study, climate changes on the southeastern Tibetan Plateau over the past millennium were determined from a 4.82-m-long sediment core from Basomtso Lake. At the centennial time scale, the Medieval Climate Anomaly (MCA), Little Ice Age (LIA) and Current Warm Period (CWP) are distinct in the Basomtso region. Rapid climate fluctuations inferred from five episodes with higher sediment input and likely warmer conditions, as well as seven episodes with lower sediment input and likely colder conditions, were well preserved in our record. These episodes with higher and lower sediment input are characterized by abrupt climate changes and short time durations. Spectral analysis indicates that the climate variations at the centennial scale on the southeastern Tibetan Plateau are influenced by solar activity during the past millennium.

No MeSH data available.


Related in: MedlinePlus