Reply to 'Pliocene warmth and gradients'
نویسندگان
چکیده
منابع مشابه
Cool La Niña during the warmth of the Pliocene?
The role of El Niño-Southern Oscillation (ENSO) in greenhouse warming and climate change remains controversial. During the warmth of the early-mid Pliocene, we find evidence for enhanced thermocline tilt and cold upwelling in the equatorial Pacific, consistent with the prevalence of a La Niña-like state, rather than the proposed persistent warm El Niño-like conditions. Our Pliocene paleothermom...
متن کاملPliocene warmth, polar amplification, and stepped Pleistocene cooling recorded in NE Arctic Russia.
Understanding the evolution of Arctic polar climate from the protracted warmth of the middle Pliocene into the earliest glacial cycles in the Northern Hemisphere has been hindered by the lack of continuous, highly resolved Arctic time series. Evidence from Lake El'gygytgyn, in northeast (NE) Arctic Russia, shows that 3.6 to 3.4 million years ago, summer temperatures were ~8°C warmer than today,...
متن کاملSimulating Pliocene warmth and a permanent El Niño-like state: The role of cloud albedo
Available evidence suggests that during the early Pliocene (4–5 Ma) the mean east-west sea surface temperature (SST) gradient in the equatorial Pacific Ocean was significantly smaller than today, possibly reaching only 1–2◦C. The meridional SST gradients were also substantially weaker, implying an expanded ocean warm pool in low latitudes. Subsequent global cooling led to the establishment of t...
متن کاملReply to "Comment on 'Dynamically maintained steady-state pressure gradients' "
A reply is made to Duncan's Comment [T. L. Duncan, Phys. Rev. E 61, 4661 (2000)] on my earlier paper [D. P. Sheehan, Phys. Rev. E 57, 6660 (1998)] in which he raises an apparent second-law paradox arising from dynamically maintained, steady-state pressure gradients. Resolutions to this paradox are considered in light of current theoretical and experimental understanding.
متن کاملMultiple tropical Andean glaciations during a period of late Pliocene warmth
The extent and behaviour of glaciers during the mid-Piacenzian warm period illustrate the sensitivity of the cryosphere to atmospheric CO2 concentrations above pre-industrial levels. Knowledge of glaciation during this period is restricted to globally or regionally averaged records from marine sediments and to sparse terrestrial glacial deposits in mid-to-high latitudes. Here we expand the Plio...
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ژورنال
عنوان ژورنال: Nature Geoscience
سال: 2015
ISSN: 1752-0894,1752-0908
DOI: 10.1038/ngeo2445