Oligocene climate dynamics
نویسندگان
چکیده
منابع مشابه
The heartbeat of the Oligocene climate system.
A 13-million-year continuous record of Oligocene climate from the equatorial Pacific reveals a pronounced "heartbeat" in the global carbon cycle and periodicity of glaciations. This heartbeat consists of 405,000-, 127,000-, and 96,000-year eccentricity cycles and 1.2-million-year obliquity cycles in periodically recurring glacial and carbon cycle events. That climate system response to intricat...
متن کاملGlobal cooling during the eocene-oligocene climate transition.
About 34 million years ago, Earth's climate shifted from a relatively ice-free world to one with glacial conditions on Antarctica characterized by substantial ice sheets. How Earth's temperature changed during this climate transition remains poorly understood, and evidence for Northern Hemisphere polar ice is controversial. Here, we report proxy records of sea surface temperatures from multiple...
متن کاملWest Antarctic paleotopography estimated at the Eocene-Oligocene climate transition
[1] One generally recognized limitation of models for rapid growth of Antarctic ice near the Eocene-Oligocene transition is that they are based on present topography, corrected only for removal of modern ice. For West Antarctica, this results in large areas below sea level that would not readily host ice. In the recently active West Antarctic rift system, other factors may have contributed to s...
متن کاملGlobal carbon cycle perturbation across the Eocene-Oligocene climate transition
The Eocene-Oligocene transition (EOT), ~34Ma, marks a tipping point in the long-term Cenozoic greenhouse to icehouse climate transition. Paleorecords reveal stepwise rapid cooling and ice growth across the EOT tightly coupled to a transient benthic δC excursion and a major and permanent deepening of the carbonate compensation depth (CCD). Based on biogeochemical box modeling, Merico et al. (200...
متن کاملThe Oligocene–Miocene Boundary – Antarctic Climate Response to Orbital Forcing
Recent AU :2 high-resolution Oligocene–Miocene oxygen isotopic records revealed a relatively transient, ca. 2myr period, 1m amplitude cyclicity in isotopic values (Oi and Mi events, respectively). Intriguingly, it has been suggested that these isotopic excursions in oceanic dO were linked to ephemeral growth and decay in Antarctic ice sheets. A great deal of effort in the palaeoceanography comm...
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: Paleoceanography
سال: 2004
ISSN: 0883-8305
DOI: 10.1029/2004pa001042