Observation of atmospheric and climate dynamics from a high resolution ice core record of a passive tracer over the last glaciation

Here we present a temporal analysis of diluted calcium from the Greenland Ice Core Project Summit ice core over a length corresponding to the duration of the last glacial period (92 - 8 ka). Our analysis suggests that this signal can be split into two distinct temporal components whose dynamics are characterized by respective timescale regimes. Timescales longer than approximately 200 years show a strong negative correlation with the temperature proxy δ 18 O signal. This we interpret as a result of the temperature dependence of processes governing source area efficiency. At faster timescales, < 200 years, correlation with the temperature proxy is significantly weakened, while its variability or mean absolute deviation is negatively correlated with the δ 18 O; this we believe is a sign of the turbulent nature or storminess of the atmosphere during the glacial climate. Furthermore, this component of the signal displays intermittency and multifractality supporting our interpretation of an observation of atmospheric dynamics. This then provides a signal of atmospheric and climate dynamics back to 92 ka.

[1]  Olga Vechtomova,et al.  Stochastic Gravity , 1999, gr-qc/9902064.

[2]  Henrik Svensmark,et al.  Contrasting atmospheric and climate dynamics of the last-glacial and Holocene periods , 1996, Nature.

[3]  G. Bond,et al.  Iceberg Discharges into the North Atlantic on Millennial Time Scales During the Last Glaciation , 1995, Science.

[4]  W. Peltier,et al.  Ice Age Paleotopography , 1994, Science.

[5]  Yongti Zhu,et al.  Tropospheric rivers: A one‐year record and a possible application to ice core data , 1994 .

[6]  D. Macayeal.  Binge/purge oscillations of the Laurentide Ice Sheet as a cause of the North Atlantic's Heinrich events , 1993 .

[7]  J. Jouzel,et al.  Evidence for general instability of past climate from a 250-kyr ice-core record , 1993, Nature.

[8]  P. Bloomfield,et al.  The Atmosphere During the Younger Dryas , 1993, Science.

[9]  R. Souchez.  Climate instability during the last interglacial period recorded in the GRIP ice core , 1993 .

[10]  R. Alley,et al.  Abrupt increase in Greenland snow accumulation at the end of the Younger Dryas event , 1993, Nature.

[11]  Vulpiani,et al.  Shell model for turbulent advection of passive-scalar fields. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[12]  R. Fairbanks.  The age and origin of the “Younger Dryas climate event” in Greenland ice cores , 1990 .

[13]  Sano,et al.  Turbulence in helium-gas free convection. , 1989, Physical review. A, General physics.

[14]  J. White,et al.  The origin of Arctic precipitation under present and glacial conditions , 1989 .

[15]  J. White,et al.  The abrupt termination of the Younger Dryas climate event , 1989, Nature.

[16]  A. Vulpiani,et al.  Anomalous scaling laws in multifractal objects , 1987 .

[17]  D. Rind.  Components of the ice age circulation , 1987 .

[18]  W. Broecker,et al.  The impact of cold North Atlantic sea surface temperatures on climate: implications for the Younger Dryas cooling (11–10 k) , 1986 .

[19]  Fabien Anselmet,et al.  Temperature structure functions in turbulent shear flows , 1984 .

[20]  R. Alley,et al.  Dominant influence of atmospheric circulation on snow accumulation in Greenland over the past 18,000 years , 1995, Nature.