Orbitally induced climate and geochemical variability across the Oligocene/Miocene boundary

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Orbitally induced climate and geochemical variability across the Oligocene/Miocene boundary

To assess the influence of orbital-scale variations on late Oligocene to early Miocene climate and ocean chemistry, high-resolution (~5 kyr) benthic foraminiferal carbon and oxygen isotope and percent coarse fraction time series were constructed for Ocean Drilling Program site 929 on Ceara Rise in the western equatorial Atlantic. These time series exhibit pervasive lowto high-frequency variabil...

متن کامل

Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition.

About 34 million years ago, Earth's climate cooled and an ice sheet formed on Antarctica as atmospheric carbon dioxide (CO2) fell below ~750 parts per million (ppm). Sedimentary cycles from a drill core in the western Ross Sea provide direct evidence of orbitally controlled glacial cycles between 34 million and 31 million years ago. Initially, under atmospheric CO2 levels of ≥600 ppm, a smaller...

متن کامل

Climate Variability Impacts on Land Use and Livelihoods in Drylands

This edited volume is devoted to the examination of the implications of the inevitable changes wrought by global change on the welfare and livelihoods of tens of millions of people who live in dryland regions. Global change is more than just climate change and the ramifications of changing trade patterns (geopolitical and economic aspects), the shift to the market economy, demographic factors (...

متن کامل

An orbitally driven tropical source for abrupt climate change

Paleoclimatic data is increasingly showing that abrupt change is present in wide regions of the globe. Here we present a mechanism for abrupt climate change with global implications. Results from a tropical coupled ocean-atmosphere model show that under certain orbital con gurations of the past, variability associated with El Ni~ no/Southern Oscillation (ENSO) physics can abruptly lock to the s...

متن کامل

Geochemical Climofunctions from North American Soils and Application to Paleosols across the Eocene-Oligocene Boundary in Oregon

The degree of chemical weathering in soils increases with mean annual precipitation (P; mm) and mean annual temperature (T; C). We have quantified these relationships using a database of major-element chemical analyses of 126 North American soils. The most robust relationship found was between P and the chemical index of alteration without potash (CIA-K): with . Another strong relationship was ...

متن کامل

ذخیره 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: 2000

ISSN: 0883-8305

DOI: 10.1029/1999pa000443