منابع مشابه
Evolution. Ice ages may explain ancient bison's boom-bust history.
1454 longer to eat their first meal than controls did and then, for the next 6 hours, ate less at each meal. As the team reported in September in the American Journal of Physiology, monkeys receiving the peptide also held food in their stomachs longer than controls did, which may explain, in part, why subsequent appetite diminished. Still, Tschoëp and Moran point out, and Bloom concedes, no stu...
متن کامل“blebby” Terrain and Domes on the Northern Plains of Mars: Evidence of Ancient Ice Ages?
Introduction: In recent years, a number of researchers have recognized signs of past glacial activity on Mars and features that could be extant rock glaciers [1,2]. There has also been the recognition of " pasted on " terrains which are interpreted as dust-covered snow or ice deposits [3]. Many of these features are attributed to relatively recent (within the last several million years) periods...
متن کاملCoherence resonance and ice ages
[1] The processes and feedbacks responsible for the 100-kyr cycle of Late Pleistocene global climate change are still being debated. This paper presents a numerical model that integrates (1) long-wavelength outgoing radiation, (2) the ice-albedo feedback, and (3) lithospheric deflection within the simple conceptual framework of coherence resonance. Coherence resonance is a dynamical process tha...
متن کاملAlgal Clues to Antarctic Ice Shelf Ages
1111 Algal Clues to Antarctic Ice Shelf Ages The naturally high variability of sea ice extent in Antarctica and the short duration of instrumental records have combined to obscure any clear record of sea ice coverage change. Curran et al. (p. 1203; see the Perspective by Wolff) present an ice core record of methanesulfonic acid, a species produced by algae living at the edges of ice shelves, wh...
متن کاملEvolution of the early Antarctic ice ages.
Understanding the stability of the early Antarctic ice cap in the geological past is of societal interest because present-day atmospheric CO2 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 (δ18O) record from the South Atlantic Ocean spanning an interval between 30.1 My...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1892
ISSN: 0028-0836,1476-4687
DOI: 10.1038/047174b0