Ice Sheets Research Papers - Academia.edu (original) (raw)
We review Phanerozoic sea-level changes [543 million years ago (Ma) to the present] on various time scales and present a new sea-level record for the past 100 million years (My). Long-term sea level peaked at 100 +/- 50 meters during the... more
We review Phanerozoic sea-level changes [543 million years ago (Ma) to the present] on various time scales and present a new sea-level record for the past 100 million years (My). Long-term sea level peaked at 100 +/- 50 meters during the Cretaceous, implying that ocean-crust production rates were much lower than previously inferred. Sea level mirrors oxygen isotope variations, reflecting ice-volume change on the 104- to 106-year scale, but a link between oxygen isotope and sea level on the 107-year scale must be due to temperature changes that we attribute to tectonically controlled carbon dioxide variations. Sea-level change has influenced phytoplankton evolution, ocean chemistry, and the loci of carbonate, organic carbon, and siliciclastic sediment burial. Over the past 100 My, sea-level changes reflect global climate evolution from a time of ephemeral Antarctic ice sheets (100 to 33 Ma), through a time of large ice sheets primarily in Antarctica (33 to 2.5 Ma), to a world with large Antarctic and large, variable Northern Hemisphere ice sheets (2.5 Ma to the present).
- by Jonathan Bamber and +1
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- Science, Multidisciplinary, Sea level rise, Ice Sheets
Abstract. Previously published results suggest that the strength of the SW Indian Monsoon can vary signifi- cantly on century- to millenium time scales, an obser- vation that has important implications for assessments of future climate... more
Abstract. Previously published results suggest that the strength of the SW Indian Monsoon can vary signifi- cantly on century- to millenium time scales, an obser- vation that has important implications for assessments of future climate and hydrologic change over densely populated portions ...
- by John Pandolfi and +1
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- Earth Sciences, Sea Level, Papua New Guinea, Physical sciences
- by Minze Stuiver and +1
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- Environmental Science, Science, Multidisciplinary, Ice Cores
We present a combined heat- and ice-flow model, constrained by measurements of temperature in the Greenland Ice Sheet Project 2 (GISP2) borehole and by the GISP2 51so record and depth-age scale, which determines a history of temperature,... more
We present a combined heat- and ice-flow model, constrained by measurements of temperature in the Greenland Ice Sheet Project 2 (GISP2) borehole and by the GISP2 51so record and depth-age scale, which determines a history of temperature, accumulation rate, and ice sheet elevation for the past 50,000 years in central Greenland. Important results are: that the temperature increase from average glacial to Holocene conditions was large, approximately 15 øC, with a 20 øC warming from late glacial to Holocene; that the average accumulation rate during the last glacial maximum (between 15 and 30 kyr B. P.) was 5.5 to 7 cm yr -1, approximately 25% of the modern accumulation rate; that long-term (500-1000 years) averaged accumulation rate and temperature have been inversely correlated during the most recent 7 millennia of the Holocene; and that the Greenland Ice Sheet probably thickened during the aleglacial transition. The inverse correlation of accumulation rate and temperature in the mid ...