Limits...
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

Map of the location of the Basomtso Lake basin (including the watershed, locations of glaciers and drainage network, the core site and a bathymetric map of the lake).The inset shows the main atmospheric circulation systems influencing the Basomtso Lake basin. The terrain map was generated using ArcMap 10 software (ESRI, USA, http://www.esri.com,) based on the basemap of USA Topo Maps (http://goto.arcgisonline.com/maps/USA_Topo_Maps). The bathymetry was measured in 2012 AD and bathymetry contours were plotted using Surfer 9.0 software (http://www.goldensoftware.com).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4835813&req=5

f1: Map of the location of the Basomtso Lake basin (including the watershed, locations of glaciers and drainage network, the core site and a bathymetric map of the lake).The inset shows the main atmospheric circulation systems influencing the Basomtso Lake basin. The terrain map was generated using ArcMap 10 software (ESRI, USA, http://www.esri.com,) based on the basemap of USA Topo Maps (http://goto.arcgisonline.com/maps/USA_Topo_Maps). The bathymetry was measured in 2012 AD and bathymetry contours were plotted using Surfer 9.0 software (http://www.goldensoftware.com).

Mentions: Basomtso Lake (93°53′42″–94°1′48″ E, 30°0′0″–30°2′55″ N, 3476 m a.s.l.) is located on the southeastern TP, which is mainly influenced by the Indian Summer Monsoon (ISM) (Fig. 1). Basomtso Lake is a freshwater lake with a pH of 7.2 and a salinity of 0.12 g L−1. The maximum depth occurrs in the western and eastern lake areas, with a depth of 120 m. The lake covers an area of 26 km2 and has a catchment area of 1209 km2 17. The lake is surrounded by mountains with elevations of 4500–5200 m and slope angles of 45–55°. The vegetation is characterized by coniferous forests, shrubs and patches of meadows. The closest meteorological station is in Nyingchi, which is at an elevation of 3000 m a.s.l. and located 65 km southeast of Basomtso Lake. The meteorological station records for 1960–1964 AD and 1973–2012 AD indicate a mean July temperature (TJuly) of 15.9 °C, a mean January temperature (TJan) of 0.9 °C and a mean annual precipitation (Pann) of 1130 mm (90% falling between April and October). The current Jiao-Guoguo and Zhong-Co glaciers are distributed in the Basomtso Lake basin (Fig. 1). Basomtso Lake is mainly fed by glacier melt water via fluvial runoff from the Basom and Nize Rivers and discharges into Yarlung-Tsangpo River through the Ba River and then Niyang River17.


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)

Map of the location of the Basomtso Lake basin (including the watershed, locations of glaciers and drainage network, the core site and a bathymetric map of the lake).The inset shows the main atmospheric circulation systems influencing the Basomtso Lake basin. The terrain map was generated using ArcMap 10 software (ESRI, USA, http://www.esri.com,) based on the basemap of USA Topo Maps (http://goto.arcgisonline.com/maps/USA_Topo_Maps). The bathymetry was measured in 2012 AD and bathymetry contours were plotted using Surfer 9.0 software (http://www.goldensoftware.com).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Map of the location of the Basomtso Lake basin (including the watershed, locations of glaciers and drainage network, the core site and a bathymetric map of the lake).The inset shows the main atmospheric circulation systems influencing the Basomtso Lake basin. The terrain map was generated using ArcMap 10 software (ESRI, USA, http://www.esri.com,) based on the basemap of USA Topo Maps (http://goto.arcgisonline.com/maps/USA_Topo_Maps). The bathymetry was measured in 2012 AD and bathymetry contours were plotted using Surfer 9.0 software (http://www.goldensoftware.com).
Mentions: Basomtso Lake (93°53′42″–94°1′48″ E, 30°0′0″–30°2′55″ N, 3476 m a.s.l.) is located on the southeastern TP, which is mainly influenced by the Indian Summer Monsoon (ISM) (Fig. 1). Basomtso Lake is a freshwater lake with a pH of 7.2 and a salinity of 0.12 g L−1. The maximum depth occurrs in the western and eastern lake areas, with a depth of 120 m. The lake covers an area of 26 km2 and has a catchment area of 1209 km2 17. The lake is surrounded by mountains with elevations of 4500–5200 m and slope angles of 45–55°. The vegetation is characterized by coniferous forests, shrubs and patches of meadows. The closest meteorological station is in Nyingchi, which is at an elevation of 3000 m a.s.l. and located 65 km southeast of Basomtso Lake. The meteorological station records for 1960–1964 AD and 1973–2012 AD indicate a mean July temperature (TJuly) of 15.9 °C, a mean January temperature (TJan) of 0.9 °C and a mean annual precipitation (Pann) of 1130 mm (90% falling between April and October). The current Jiao-Guoguo and Zhong-Co glaciers are distributed in the Basomtso Lake basin (Fig. 1). Basomtso Lake is mainly fed by glacier melt water via fluvial runoff from the Basom and Nize Rivers and discharges into Yarlung-Tsangpo River through the Ba River and then Niyang River17.

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