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10.1073/pnas.1615440114 http://scihub22266oqcxt.onion/10.1073/pnas.1615440114 C5393229!5393229 !28348211     free     free     free Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=28348211 &cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215       Proc+Natl+Acad+Sci+U+S+A 2017 ; 114 (15 ): 3867-3872 Nephropedia Template TP {{tp|p=28348211 |t=2017. Evolution of the early Antarctic ice ages |pdf=|usr=}}{{28348211 }} gab.com Text Evolution of the early Antarctic ice ages JO: Proc Natl Acad Sci U S A http://www.kidney.de/pget.php?&tw=1&pmid=28348211 #FOAvip Understanding the stability of the early Antarctic ice cap in the geological past is of societal interest because present-day atmospheric CO(2) concentrations have reached values comparable to those estimated for the Oligocene and the Early Miocene epochs. Here we analyze a new high-resolution deep-sea oxygen isotope (?(18)O) record from the South Atlantic Ocean spanning an interval between 30.1 My and 17.1 My ago. The record displays major oscillations in deep-sea temperature and Antarctic ice volume in response to the ?110-ky eccentricity modulation of precession. Conservative minimum ice volume estimates show that waxing and waning of at least ?85 to 110% of the volume of the present East Antarctic Ice Sheet is required to explain many of the ?110-ky cycles. Antarctic ice sheets were typically largest during repeated glacial cycles of the mid-Oligocene (?28.0 My to ?26.3 My ago) and across the Oligocene-Miocene Transition (?23.0 My ago). However, the high-amplitude glacial-interglacial cycles of the mid-Oligocene are highly symmetrical, indicating a more direct response to eccentricity modulation of precession than their Early Miocene counterparts, which are distinctly asymmetrical-indicative of prolonged ice buildup and delayed, but rapid, glacial terminations. We hypothesize that the long-term transition to a warmer climate state with sawtooth-shaped glacial cycles in the Early Miocene was brought about by subsidence and glacial erosion in West Antarctica during the Late Oligocene and/or a change in the variability of atmospheric CO(2) levels on astronomical time scales that is not yet captured in existing proxy reconstructions. Twit Text FOAVip Evolution of the early Antarctic ice ages ????Proc Natl Acad Sci U S A http://www.kidney.de/pget.php?&tw=1&pmid=28348211 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=28348211 #FOAvip English Wikipedia <ref>{{Cite pmid|28348211 }}</ref> Evolution of the early Antarctic ice ages #MMPMID28348211 Liebrand D ; de Bakker AT ; Beddow HM ; Wilson PA ; Bohaty SM ; Ruessink G ; Pälike H ; Batenburg SJ ; Hilgen FJ ; Hodell DA ; Huck CE ; Kroon D ; Raffi I ; Saes MJ ; van Dijk AE ; Lourens LJ Proc Natl Acad Sci U S A 2017[Apr]; 114 (15 ): 3867-3872 PMID28348211 show ga Understanding the stability of the early Antarctic ice cap in the geological past is of societal interest because present-day atmospheric CO(2) concentrations have reached values comparable to those estimated for the Oligocene and the Early Miocene epochs. Here we analyze a new high-resolution deep-sea oxygen isotope (?(18)O) record from the South Atlantic Ocean spanning an interval between 30.1 My and 17.1 My ago. The record displays major oscillations in deep-sea temperature and Antarctic ice volume in response to the ?110-ky eccentricity modulation of precession. Conservative minimum ice volume estimates show that waxing and waning of at least ?85 to 110% of the volume of the present East Antarctic Ice Sheet is required to explain many of the ?110-ky cycles. Antarctic ice sheets were typically largest during repeated glacial cycles of the mid-Oligocene (?28.0 My to ?26.3 My ago) and across the Oligocene-Miocene Transition (?23.0 My ago). However, the high-amplitude glacial-interglacial cycles of the mid-Oligocene are highly symmetrical, indicating a more direct response to eccentricity modulation of precession than their Early Miocene counterparts, which are distinctly asymmetrical-indicative of prolonged ice buildup and delayed, but rapid, glacial terminations. We hypothesize that the long-term transition to a warmer climate state with sawtooth-shaped glacial cycles in the Early Miocene was brought about by subsidence and glacial erosion in West Antarctica during the Late Oligocene and/or a change in the variability of atmospheric CO(2) levels on astronomical time scales that is not yet captured in existing proxy reconstructions. ?Evolution of the early Antarctic ice ages (epmc).pdf DeepDyve Pubget Overpricing