Events of abrupt change of Indian monsoon recorded in Dasuopu ice core from Himalayas

2002 ◽  
Vol 47 (8) ◽  
pp. 691 ◽  
Author(s):  
Keqin DUAN
Keyword(s):  
Abrupt Change ◽  
Indian Monsoon ◽  
Ice Core ◽  
Dasuopu Ice Core

scholarly journals Dansgaard-Oeschger events: tipping points in the climate system

2012 ◽  
Vol 8 (5) ◽  
pp. 4269-4294 ◽  
Author(s):  
A. A. Cimatoribus ◽  
S. S. Drijfhout ◽  
V. Livina ◽  
G. van der Schrier
Keyword(s):  
High Resolution ◽  
Abrupt Change ◽  
Ice Core ◽  
Tipping Point ◽  
Statistical Properties ◽  
Climate System ◽  
Tipping Points ◽  
External Forcing ◽  
Observational Constraint ◽  
Climate Fluctuations

Abstract. The largest variability in temperature over the last sixty thousand years is connected with Dansgaard-Oeschger events. Various prototype models have been proposed to explain these rapid climate fluctuations, but until now no observational constraint has been forwarded to choose between different theories. We assess the bimodality of the system reconstructing the topology of the multi-dimensional attractor over which the climate system evolves. Furthermore, we show that Dansgaard-Oeschger events are compatible with the crossing of a tipping point in the climate system. We use high-resolution ice core isotope data to investigate the statistical properties of the climate fluctuations in the period before the onset of the abrupt change. We find that the statistics are consistent with the switches between two different climate equilibrium states in response to a changing external forcing.

scholarly journals Dansgaard–Oeschger events: bifurcation points in the climate system

2013 ◽  
Vol 9 (1) ◽  
pp. 323-333 ◽  
Author(s):  
A. A. Cimatoribus ◽  
S. S. Drijfhout ◽  
V. Livina ◽  
G. van der Schrier
Keyword(s):  
High Resolution ◽  
Abrupt Change ◽  
Ice Core ◽  
Ice Sheets ◽  
Climate System ◽  
External Forcing ◽  
Glacial Cycle ◽  
Warning Signals ◽  
Climate Fluctuations ◽  
The Last Glacial

Abstract. Dansgaard–Oeschger events are a prominent mode of variability in the records of the last glacial cycle. Various prototype models have been proposed to explain these rapid climate fluctuations, and no agreement has emerged on which may be the more correct for describing the palaeoclimatic signal. In this work, we assess the bimodality of the system, reconstructing the topology of the multi-dimensional attractor over which the climate system evolves. We use high-resolution ice core isotope data to investigate the statistical properties of the climate fluctuations in the period before the onset of the abrupt change. We show that Dansgaard–Oeschger events have weak early warning signals if the ensemble of events is considered. We find that the statistics are consistent with the switches between two different climate equilibrium states in response to a changing external forcing (e.g. solar, ice sheets), either forcing directly the transition or pacing it through stochastic resonance. These findings are most consistent with a model that associates Dansgaard–Oeschger with changing boundary conditions, and with the presence of a bifurcation point.

Accumulation in Dasuopu ice core in Qinghai-Tibet Plateau and solar activity

2000 ◽  
Vol 45 (11) ◽  
pp. 1038-1042 ◽  
Author(s):  
Keqin Duan ◽  
Ninglian Wang ◽  
Yuefang Li ◽  
Weizheng Sun
Keyword(s):  
Solar Activity ◽  
Ice Core ◽  
Tibet Plateau ◽  
Dasuopu Ice Core ◽  
Qinghai Tibet Plateau

scholarly journals Influence of regional precipitation patterns on stable isotopes in ice cores from the central Himalayas

2013 ◽  
Vol 7 (3) ◽  
pp. 1871-1905 ◽  
Author(s):  
H. Pang ◽  
S. Hou ◽  
S. Kaspari ◽  
P. A. Mayewski
Keyword(s):  
Ice Core ◽  
Precipitation Amount ◽  
Ice Cores ◽  
Central Himalayas ◽  
Precipitation Patterns ◽  
The North ◽  
Stable Isotopic ◽  
Dasuopu Ice Core ◽  
Isotopic Records ◽  
Temperature Proxy

Abstract. Several ice cores have been recovered from the Dasuopu Glacier and the East Rongbuk (ER) Glacier in the central Himalayas since the 1990s. Although the distance between the ER and the Dasuopu ice core drilling sites is only ∼125 km, the stable isotopic record (δ18O or δD) of the ER core is interpreted as a precipitation proxy while the Dasuopu core as a temperature proxy. Thus, the climatological significance of the stable isotopic records of these Himalayan ice cores remains a subject of debate. Based on analysis of regional precipitation patterns over the region, we find that the different interpretations of the Dasuopu and Everest isotopic records may not be contradictive. The north–south and west–east seesaws of the Indian Summer Monsoon (ISM) precipitation are primarily responsible for precipitation falling at the ER site, which results in a negative correlation between the ER δ18O or δD record and precipitation amount along the southern slope of the central Himalayas, corresponding to the "amount effect". In addition to the ISM precipitation, non-summer monsoonal precipitation associated with winter westerlies also significantly contributes to precipitation falling at the Dasuopu site, which may cause a positive correlation between the Dasuopu stable isotopic record and temperature, in response to the "temperature effect". Our results have important implications for interpreting the stable isotopic ice core records recovered from different climatological regimes of the Himalayas.

Sign in / Sign up

Export Citation Format

Share Document