Paleocurrent reconstruction of the deep Pacific inflow during the middle Miocene: Reflections of East Antarctic Ice Sheet growth
作者： Ian R. Hall , I. Nicholas McCave , Rainer Zahn , Lionel Carter , Paul C. Knutz
DOI: 10.1029/2002PA000817
关键词:
摘要: Today the deep western boundary current (DWBC) east of New Zealand is most important route for water entering Pacific Ocean. Large-scale changes in circulation patterns are thought to have been associated with development East Antarctic Ice Sheet (EAIS) close main source bottom DWBC. Here we reconstruct changing speed southwest DWBC during middle Miocene from ∼15.5–12.5 Ma, a period significant global ice accumulation EAIS growth. Sortable silt mean grain sizes Ocean Drilling Program Site 1123 reveal variability inflow on timescale 41 kyr orbital obliquity cycle. Similar flow recently demonstrated Pleistocene epoch. Collectively, these observations suggest that strong coupling between and high-latitude climate forcing may persistent feature thermohaline system at least past 15 Myr. Furthermore, long-term an intensification under inferred increase Southern Component Water production. This occurred same time as decreasing Tethyan outflow major growth ∼15.5 13.5 Ma. These results provide evidence component was support view this interval represents step Neogene icehouse climate.
uab.cat
agu.org
researchgate.net 参考文章(58)
James P. M. Syvitski, Principles, Methods and Application of Particle Size Analysis ,(2007)
J. Laskar, F. Boudin, F. Joutel, Orbital, precessional, and insolation quantities for the earth from -20 Myr to +10 Myr. Astronomy and Astrophysics. ,vol. 270, pp. 522- 533 ,(1993)
J. R. Toggweiler, B. Samuels, New Radiocarbon Constraints on the Upwelling of Abyssal Water to the Ocean’s Surface Springer, Berlin, Heidelberg. pp. 333- 366 ,(1993) , 10.1007/978-3-642-84608-3_14
J. R. Toggweiler, B. Samuels, Is the Magnitude of the Deep Outflow from the Atlantic Ocean Actually Governed by Southern Hemisphere Winds Springer, Berlin, Heidelberg. pp. 303- 331 ,(1993) , 10.1007/978-3-642-84608-3_13
M. T. LEDBETTER, D. A. JOHNSON, Increased transport of antarctic bottom water in the vema channel during the last ice age. Science. ,vol. 194, pp. 837- 839 ,(1976) , 10.1126/SCIENCE.194.4267.837
P.P.E. Weaver, H. Neil, L. Carter, Sea surface temperature estimates from the Southwest Pacific based on planktonic foraminifera and oxygen isotopes Palaeogeography, Palaeoclimatology, Palaeoecology. ,vol. 131, pp. 241- 256 ,(1997) , 10.1016/S0031-0182(97)00005-9
Henry Stommel, E. Dixon Stroup, Joseph L. Reid, Bruce A. Warren, Transpacific hydrographic sections at lats. 43°S and 28°S: the SCORPIO expedition—II. deep water☆ Deep Sea Research and Oceanographic Abstracts. ,vol. 20, pp. 1- 7 ,(1973) , 10.1016/0011-7471(73)90039-9
James D. Wright, Kenneth G. Miller, Control of North Atlantic Deep Water Circulation by the Greenland‐Scotland Ridge Paleoceanography. ,vol. 11, pp. 157- 170 ,(1996) , 10.1029/95PA03696
Michael E. Mann, Jonathan M. Lees, Robust estimation of background noise and signal detection in climatic time series Climatic Change. ,vol. 33, pp. 409- 445 ,(1996) , 10.1007/BF00142586
T Whitworth III, B.A Warren, W.D Nowlin, Jr, S.B Rutz, R.D Pillsbury, M.I Moore, On the deep western-boundary current in the Southwest Pacific Basin Progress in Oceanography. ,vol. 43, pp. 1- 54 ,(1999) , 10.1016/S0079-6611(99)00005-1