Calcium isotopes in caves as a proxy for aridity: Modern calibration and application to the 8.2 kyr event

2016 ◽  
Vol 443 ◽  
pp. 129-138 ◽  
Author(s):  
R.A. Owen ◽  
C.C. Day ◽  
C.-Y. Hu ◽  
Y.-H. Liu ◽  
M.D. Pointing ◽  
...  
Keyword(s):  
Calcium Isotopes ◽  
8.2 Kyr Event

Influences on the fractionation of calcium isotopes in planktonic foraminifera

2008 ◽  
Vol 268 (1-2) ◽  
pp. 124-136 ◽  
Author(s):  
Elizabeth M. Griffith ◽  
Adina Paytan ◽  
Reinhard Kozdon ◽  
Anton Eisenhauer ◽  
A. Christina Ravelo
Keyword(s):  
Planktonic Foraminifera ◽  
Calcium Isotopes

The charge distributions of the oxygen and calcium isotopes

1979 ◽  
Vol 85 (2-3) ◽  
pp. 167-171 ◽  
Author(s):  
B.A. Brown ◽  
S.E. Massen ◽  
P.E. Hodgson
Keyword(s):  
Calcium Isotopes ◽  
Charge Distributions

Untersuchung von Calciumisotopieeffekten bei heterogenen Austauschgleichgewichten / Investigation of Isotopic Effects of Calcium in Heterogeneous Exchange Equilibria

1972 ◽  
Vol 27 (2) ◽  
pp. 126-133 ◽  
Author(s):  
Klaus Gustav Heumann ◽  
Karl Heinrich Lieser
Keyword(s):  
Separation Factor ◽  
Calcium Concentration ◽  
Isotopic Fractionation ◽  
Ion Source ◽  
Isotopic Effect ◽  
Mass Unit ◽  
Calcium Isotopes ◽  
Heterogeneous Exchange ◽  
Loaded Column ◽  
Isotopic Effects

The following heterogeneous exchange equilibria have been examined for isotopic effects: CaCO3/Ca(aq.)2⊕. Ca-GBHA/Ca(aq.)2⊕ and Ca(Dowex 50)2⊕/Ca(aq.)2⊕ (GBHA = glyoxal-bis (2-hydroxyanil)). The isotopic ratios 44Ca/40Ca and 48Ca/40Ca were determined by means of a mass spectrometer with a thermal ion source. In the system CaCO3/Ca(aq.)2⊕, the elementary separation factor was found to be less than 1‰ or 0,5‰ per mass unit, respectively.For the exchange in the system Ca-GBHA/Ca(aq.)2⊕ in the concentration range from 0.011 to 0.84 M an elementary separation factor less than 1‰ per mass unit was found; from a three-stage experiment at a calcium concentration of 1.23 M it was concluded that the elementary isotopic effect is less than 0.4‰ per mass unit. Therefore no isotopic fractionation is to be expected for precipitation of inorganic or organic calcium salts.An enrichment of the heavier calcium isotopes in the solution was found in the case of the exchange in a Dowex 50-X12 loaded column. The isotopic effect depends on the concentration of the hydrochloric acid used as the eluent.

Configuration Mixing in the Calcium Isotopes

1970 ◽  
Vol 24 (4) ◽  
pp. 145-148 ◽  
Author(s):  
L. R. B. Elton ◽  
S. J. Webb
Keyword(s):  
Calcium Isotopes ◽  
Configuration Mixing

Systematics of ground state (p, t) transitions in calcium isotopes

1983 ◽  
Vol 27 (1) ◽  
pp. 405-407 ◽  
Author(s):  
A. Saha ◽  
Kamal K. Seth ◽  
H. Nann
Keyword(s):  
Ground State ◽  
Calcium Isotopes

The quasihole aspect of hole strength distributions in odd potassium and calcium isotopes

1976 ◽  
Vol 263 (2) ◽  
pp. 210-236 ◽  
Author(s):  
P. Doll ◽  
G.J. Wagner ◽  
K.T. Knöpfle ◽  
G. Mairle
Keyword(s):  
Calcium Isotopes ◽  
Strength Distributions

Significant increases in global weathering during Oceanic Anoxic Events 1a and 2 indicated by calcium isotopes

2011 ◽  
Vol 309 (1-2) ◽  
pp. 77-88 ◽  
Author(s):  
Clara L. Blättler ◽  
Hugh C. Jenkyns ◽  
Linda M. Reynard ◽  
Gideon M. Henderson
Keyword(s):  
Calcium Isotopes ◽  
Anoxic Events

scholarly journals South Atlantic island record reveals a South Atlantic response to the 8.2 kyr event

2007 ◽  
Vol 3 (3) ◽  
pp. 729-753 ◽  
Author(s):  
K. Ljung ◽  
S. Björck ◽  
H. Renssen ◽  
D. Hammarlund
Keyword(s):  
North Atlantic ◽  
Energy Transport ◽  
Climate Model ◽  
South Atlantic ◽  
Laurentide Ice Sheet ◽  
Climate Fluctuations ◽  
The North ◽  
Central South ◽  
Atlantic Island ◽  
8.2 Kyr Event

Abstract. One of the most distinct climate fluctuations during the Holocene is the short and rapid event centred around 8200 years ago, the 8.2 kyr event, which was most likely triggered by glacial melt-water forcing from the receding Laurentide ice-sheet. Evidence for this cooling has primarily been reported from sites around the North Atlantic, but an increasing number of observations imply a more wide-spread occurrence. Palaeoclimate archives from the Southern Hemisphere have hitherto failed to uncover a distinct climatic anomaly associated with the 8.2 kyr event. Here we present a lake sediment record from Nightingale Island in the central South Atlantic showing enhanced precipitation between 8275 and 8025 cal. yrs BP, most likely as a consequence of increased sea surface temperature (SST). We show that this is consistent with climate model projections of a warming of the South Atlantic in response to reduced north-ward energy transport during the 8.2 kyr event.

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