scholarly journals Stable oxygen isotopic composition of corals from the Gulf of Guinea as indicators of periods of extreme precipitation conditions in the sub-Sahara

1998 ◽  
Vol 103 (C12) ◽  
pp. 27885-27891 ◽  
Author(s):  
Peter K. Swart ◽  
Kathy S. White ◽  
David Enfield ◽  
Richard E. Dodge ◽  
Peter Milne
Keyword(s):  
Isotopic Composition ◽  
Extreme Precipitation ◽  
Oxygen Isotopic Composition ◽  
Gulf Of Guinea ◽  
Oxygen Isotopic ◽  
Stable Oxygen

scholarly journals Meteoric ice contribution and influence of weather on landfast ice growth in the Gulf of Finland, Baltic Sea

2011 ◽  
Vol 52 (57) ◽  
pp. 91-96 ◽  
Author(s):  
Jari Uusikivi ◽  
Mats A. Granskog ◽  
Eloni Sonninen
Keyword(s):  
Isotopic Composition ◽  
Ice Cover ◽  
Oxygen Isotopic Composition ◽  
Gulf Of Finland ◽  
Ice Thickness ◽  
Landfast Ice ◽  
Oxygen Isotopic ◽  
Stable Oxygen ◽  
One Year ◽  
The Gulf Of Finland

AbstractThe stable oxygen isotopic composition (δ18O), texture and stratigraphy of landfast ice in Santala Bay, Gulf of Finland, were studied annually from 1999 to 2009. Apart from one year when there was no ice, maximum ice thickness ranged from 0.22 to 0.60 m. Maximum ice thickness was determined primarily by average air temperature, and a simple accumulated freezing-degree-day–ice-thickness model explained 86% of ice-thickness variance. the total ice thickness each winter was dominated by columnar ice and intermediate granular/columnar ice formed at the base of the ice cover. Meteoric ice (snow ice and superimposed ice) accumulated at the top of the ice cover each winter and constituted 4–39% of the total ice thickness (ice mass). Snow ice formed in seven of the ten winters; superimposed ice formed in only three winters. the snow fraction in the meteoric ice contributed 1–30% annually of the total ice mass, with an average of 8.8%.

Changes of Ionic and Oxygen Isotopic Composition of the Snowpack at the Glacier Austre Okstindbreen, Norway, 1995

1998 ◽  
Vol 29 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Peter Raben ◽  
Wilfred H. Theakstone
Keyword(s):  
Isotopic Composition ◽  
Sea Level ◽  
Oxygen Isotopes ◽  
Oxygen Isotopic Composition ◽  
Isotopic Ratios ◽  
Vertical Variations ◽  
Oxygen Isotopic ◽  
The Difference ◽  
Liquid Precipitation ◽  
Different Altitudes

Marked vertical variations of ions and oxygen isotopes were present in the snowpack at the glacier Austre Okstindbreen during the pre-melting phase in 1995 at sites between 825 m and 1,470 m above sea level. As the first meltwater percolated from the top of the pack, ions were moved to a greater depth, but the isotopic composition remained relatively unchanged. Ions continued to move downwards through the pack during the melting phase, even when there was little surface melting and no addition of liquid precipitation. The at-a-depth correlation between ionic concentrations and isotopic ratios, strong in the pre-melting phase, weakened during melting. In August, concentrations of Na+ and Mg2+ ions in the residual pack were low and vertical variations were slight; 18O enrichment had occurred. The difference of the time at which melting of the snowpack starts at different altitudes influences the input of ions and isotopes to the underlying glacier.

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