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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

(a) The six AMS 14C dataset and their distribution with depth. (b) Age-depth model of BSCW-1, black dots indicate the 95% probability intervals of the model.
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f2: (a) The six AMS 14C dataset and their distribution with depth. (b) Age-depth model of BSCW-1, black dots indicate the 95% probability intervals of the model.

Mentions: The accelerator mass spectrometry (AMS) 14C dating results for the core sediment from Basomtso Lake (BSCW-1) are presented in Table 1. The six radiocarbon ages show a general linear correlation, confirming a continuous sedimentation process (Fig. 2a). The calibration and age-depth model were constructed with Bacon 2.218 in R 3.2 software using Bayesian statistics to reconstruct Bayesian accumulation histories for the deposits (Fig. 2b). The model was performed using the default settings for lake sediments with 1-cm resolution. According to the age-depth model, the sedimentary rates of BSCW-1 ranged from 0.38 to 0.67 cm yr−1 with an average of 0.51 cm yr−1. Compared with other well-dated lacustrine records for the TP192021, the sedimentary rates of Basomtso Lake during the past millennium were much higher. The higher sedimentary rate in Basomtso Lake is related to the high sediment yield from glacier activity as well as the high fluvial runoff fed by glacier melt water and precipitation.


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)

(a) The six AMS 14C dataset and their distribution with depth. (b) Age-depth model of BSCW-1, black dots indicate the 95% probability intervals of the model.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: (a) The six AMS 14C dataset and their distribution with depth. (b) Age-depth model of BSCW-1, black dots indicate the 95% probability intervals of the model.
Mentions: The accelerator mass spectrometry (AMS) 14C dating results for the core sediment from Basomtso Lake (BSCW-1) are presented in Table 1. The six radiocarbon ages show a general linear correlation, confirming a continuous sedimentation process (Fig. 2a). The calibration and age-depth model were constructed with Bacon 2.218 in R 3.2 software using Bayesian statistics to reconstruct Bayesian accumulation histories for the deposits (Fig. 2b). The model was performed using the default settings for lake sediments with 1-cm resolution. According to the age-depth model, the sedimentary rates of BSCW-1 ranged from 0.38 to 0.67 cm yr−1 with an average of 0.51 cm yr−1. Compared with other well-dated lacustrine records for the TP192021, the sedimentary rates of Basomtso Lake during the past millennium were much higher. The higher sedimentary rate in Basomtso Lake is related to the high sediment yield from glacier activity as well as the high fluvial runoff fed by glacier melt water and precipitation.

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