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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

Variations of grain size compositions, median size d (0.5), MS, TOC, TN, C/N and LOI in the core sediment of Basomtso Lake.I, II, III, IV and V indicate episodes with higher sediment input and likely warmer conditions characterized by higher LOI, TN, TOC, silt and sand fractions and MS values, and 1, 2, 3, 4, 5, 6, and 7 indicate episodes with lower sediment input and likely colder conditions characterized by lower LOI, TN, TOC, silt and sand fractions and MS values. Two cross-shaped marks indicate strong earthquakes recorded in the southeastern TP.
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f3: Variations of grain size compositions, median size d (0.5), MS, TOC, TN, C/N and LOI in the core sediment of Basomtso Lake.I, II, III, IV and V indicate episodes with higher sediment input and likely warmer conditions characterized by higher LOI, TN, TOC, silt and sand fractions and MS values, and 1, 2, 3, 4, 5, 6, and 7 indicate episodes with lower sediment input and likely colder conditions characterized by lower LOI, TN, TOC, silt and sand fractions and MS values. Two cross-shaped marks indicate strong earthquakes recorded in the southeastern TP.

Mentions: The loss on ignition (LOI) of BSCW-1 ranges from 1.0% to 5.5% with an average of 2.6% (Fig. 3). The LOI values were relatively high for sediments that accumulated within the period of the 1080s–1140s and were low for the period of the 1140s–1800s. The LOI values were relatively high for the sediments deposited after 1800s, with an average of 3.5%. The variations in total organic carbon (TOC) and total nitrogen (TN) generally paralleled that of the LOI; i.e., higher TOC and TN values correspond to higher LOI values (Fig. 3). However, some periods characterized by lower LOI values (labelled 1–7) and brief high LOI values (labelled I–V), as well as rapid increases in the LOI, were recorded between the 1140s and the 1800s (Fig. 3).


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)

Variations of grain size compositions, median size d (0.5), MS, TOC, TN, C/N and LOI in the core sediment of Basomtso Lake.I, II, III, IV and V indicate episodes with higher sediment input and likely warmer conditions characterized by higher LOI, TN, TOC, silt and sand fractions and MS values, and 1, 2, 3, 4, 5, 6, and 7 indicate episodes with lower sediment input and likely colder conditions characterized by lower LOI, TN, TOC, silt and sand fractions and MS values. Two cross-shaped marks indicate strong earthquakes recorded in the southeastern TP.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Variations of grain size compositions, median size d (0.5), MS, TOC, TN, C/N and LOI in the core sediment of Basomtso Lake.I, II, III, IV and V indicate episodes with higher sediment input and likely warmer conditions characterized by higher LOI, TN, TOC, silt and sand fractions and MS values, and 1, 2, 3, 4, 5, 6, and 7 indicate episodes with lower sediment input and likely colder conditions characterized by lower LOI, TN, TOC, silt and sand fractions and MS values. Two cross-shaped marks indicate strong earthquakes recorded in the southeastern TP.
Mentions: The loss on ignition (LOI) of BSCW-1 ranges from 1.0% to 5.5% with an average of 2.6% (Fig. 3). The LOI values were relatively high for sediments that accumulated within the period of the 1080s–1140s and were low for the period of the 1140s–1800s. The LOI values were relatively high for the sediments deposited after 1800s, with an average of 3.5%. The variations in total organic carbon (TOC) and total nitrogen (TN) generally paralleled that of the LOI; i.e., higher TOC and TN values correspond to higher LOI values (Fig. 3). However, some periods characterized by lower LOI values (labelled 1–7) and brief high LOI values (labelled I–V), as well as rapid increases in the LOI, were recorded between the 1140s and the 1800s (Fig. 3).

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