Stalagmite Inferred High Resolution Climatic Changes through Pleistocene-Holocene Transition in Northwest Indian Himalaya

2016 ◽  
Vol 07 (03) ◽  
Author(s):  
Bahadur Singh Kotlia ◽  
Anoop Kumar Singh
Keyword(s):  
High Resolution ◽  
Climatic Changes ◽  
Indian Himalaya

scholarly journals A High-Resolution Radiocarbon Calibration Between 11,700 and 12,400 Calendar Years Bp Derived from 230Th Ages of Corals from Espiritu Santo Island, Vanuatu

Radiocarbon ◽  
1998 ◽  
Vol 40 (3) ◽  
pp. 1093-1105 ◽  
Author(s):  
G. S. Burr ◽  
J. Warren Beck ◽  
F. W. Taylor ◽  
Jacques Récy ◽  
R. Lawrence Edwards ◽  
...  
Keyword(s):  
High Resolution ◽  
Younger Dryas ◽  
Climatic Changes ◽  
Relative Uncertainty ◽  
Scale Growth ◽  
Data Set ◽  
Surface Ocean ◽  
Growth Bands ◽  
Radiocarbon Calibration ◽  
Good Agreement

This paper presents radiocarbon results from a single Diploastrea heliopora coral from Vanuatu that lived during the Younger Dryas climatic episode, between ca. 11,700 and 12,400 calendar yr bp. The specimen has been independently dated with multiple 230Th measurements to permit calibration of the 14C time scale. Growth bands in the coral were used to identify individual years of growth. 14C measurements were made on each year. These values were averaged to achieve decadal resolution for the 14C calibration. The relative uncertainty of the decadal 14C data was below 1% (2σ). The data are in good agreement with the existing dendrochronology and allow for high-resolution calibration for most years. Variations in the fine structure of the 14C time series preserved in this specimen demonstrate sporadic rapid increases in the Δ14C content of the surface ocean and atmosphere. Certain sharp rises in Δ14C are coincident with gaps in coral growth evidenced by several hiatuses. These may be related to rapid climatic changes that occurred during the Younger Dryas. This is the first coral calibration with decadal resolution and the only such data set to extend beyond the dendrochronology-based 14C calibration.

Paleoecology and high-resolution paleohydrology of a kettle peatland in upper Michigan

2004 ◽  
Vol 61 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Robert K. Booth ◽  
Stephen T. Jackson ◽  
Catherine E.D. Gray
Keyword(s):  
High Resolution ◽  
Climate Variability ◽  
Time Scales ◽  
Plant Macrofossils ◽  
Testate Amoebae ◽  
Climatic Changes ◽  
Primary Objective ◽  
History Of ◽  
Past Climate Variability

We investigated the developmental and hydrological history of a Sphagnum-dominated, kettle peatland in Upper Michigan using testate amoebae, plant macrofossils, and pollen. Our primary objective was to determine if the paleohydrological record of the peatland represents a record of past climate variability at subcentennial to millennial time scales. To assess the role of millennial-scale climate variability on peatland paleohydrology, we compared the timing of peatland and upland vegetation changes. To investigate the role of higher-frequency climate variability on peatland paleohydrology, we used testate amoebae to reconstruct a high-resolution, hydrologic history of the peatland for the past 5100 years, and compared this record to other regional records of paleoclimate and vegetation. Comparisons revealed coherent patterns of hydrological, vegetational, and climatic changes, suggesting that peatland paleohydrology responded to climate variability at millennial to sub-centennial time scales. Although ombrotrophic peatlands have been the focus of most high-resolution peatland paleoclimate research, paleohydrological records from Sphagnum-dominated, closed-basin peatlands record high-frequency and low-magnitude climatic changes and thus represent a significant source of unexplored paleoclimate data.

A high-resolution record of Holocene environmental and climatic changes from Lake Balikun (Xinjiang, China): Implications for central Asia

The Holocene ◽  
2011 ◽  
Vol 22 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Cheng-Bang An ◽  
Yanbin Lu ◽  
Jiaju Zhao ◽  
Shichen Tao ◽  
Weimiao Dong ◽  
...  
Keyword(s):  
High Resolution ◽  
Central Asia ◽  
Climatic Changes

scholarly journals Sensitivity of chemical species to climatic changes in the last 45 kyr as revealed by high-resolution Dome C (East Antarctica) ice-core analysis

2004 ◽  
Vol 39 ◽  
pp. 457-466 ◽  
Author(s):  
Roberto Udisti ◽  
Silvia Becagli ◽  
Silvia Benassai ◽  
Martine De Angelis ◽  
Margareta E. Hansson ◽  
...  
Keyword(s):  
High Resolution ◽  
Environmental Changes ◽  
Accumulation Rate ◽  
Ice Core ◽  
Chemical Species ◽  
Climatic Changes ◽  
Snow Accumulation ◽  
Last Deglaciation ◽  
Temperature Trends ◽  
Chemical Profiles

AbstractTo assess the cause/effect relationship between climatic and environmental changes, we report high-resolution chemical profiles of the Dome C ice core (788m, 45 kyr), drilled in the framework of the European Project for Ice Coring in Antarctica (EPICA). Snow-concentration and depositional-flux changes during the last deglaciation were compared with climatic changes, derived by δD profile. Concentration and temperature profiles showed an anticorrelation, driven by changes in source intensity and transport efficiency of the atmospheric aerosol and by snow accumulation-rate variations. The flux calculation allowed correction for accumulation rate. While sulphate and ammonium fluxes are quite constant, Na+, Mg2+ and Ca2+ underwent the greatest changes, showing fluxes respectively about two, three and six times lower in the Holocene than in the Last Glacial Maximum. Chloride, nitrate and methanesulphonic acid (MSA) also exhibited large changes, but their persistence depends on depositional and post-depositional effects. The comparison between concentrations and δD profiles revealed leads and lags between chemical and temperature trends: Ca2+ and nitrate preceded by about 300 years the δD increase at the deglaciation onset, while MSA showed a 400 year delay. Generally, all components reached low Holocene values in the first deglaciation step (18.0–14.0 kyr BP), but Na+, Mg2+ and nitrate show changes during the Antarctic Cold Reversal (14.0– 12.5 kyr BP).

Sign in / Sign up

Export Citation Format

Share Document