منابع مشابه
Evidence for extreme climatic warmth from late cretaceous arctic vertebrates
A Late Cretaceous (92 to 86 million years ago) vertebrate assemblage from the high Canadian Arctic (Axel Heiberg Island) implies that polar climates were warm (mean annual temperature exceeding 14 degreesC) rather than near freezing. The assemblage includes large (2.4 meters long) champsosaurs, which are extinct crocodilelike reptiles. Magmatism at six large igneous provinces at this time sugge...
متن کاملTropical ocean‐atmosphere controls on inter‐annual climate variability in the Cretaceous Arctic
[1] The first annually resolved sedimentary record from the Cretaceous is used to develop time series of inter‐annual and decadal scale climate variability from the Arctic Ocean. Analysis of records spanning 1000 years reveals strong periodicities in the quasi‐biennial oscillation and El Niño ‐ Southern Oscillation (ENSO) band as well as a 14 year period, which all closely match periodicities t...
متن کاملSea level variability in the Arctic Ocean from AOMIP models
[1] Monthly sea levels from five Arctic Ocean Model Intercomparison Project (AOMIP) models are analyzed and validated against observations in the Arctic Ocean. The AOMIP models are able to simulate variability of sea level reasonably well, but several improvements are needed to reduce model errors. It is suggested that the models will improve if their domains have a minimum depth less than 10 m...
متن کاملLate Cretaceous Ocean: Coupled Simulations with the NCAR CSM
Deep ocean circulation may be a significant factor in determining climate. Here, we describe two long, fully coupled atmosphere-ocean simulations with the NCAR Climate System Model (CSM) for the late Cretaceous (80 Ma). Our results suggest that higher levels of atmospheric CO2 and the altered paleogeography of the late Cretaceous resulted in a surface ocean state temperature, salinity, and circ...
متن کاملSeasonal predictions of ice extent in the Arctic Ocean
[1] How well can the extent of arctic sea ice be predicted for lead periods of up to one year? The forecast ability of a linear empirical model is explored. It uses as predictors historical information about the ocean and ice obtained from an ice–ocean model retrospective analysis. The monthly model fields are represented by a correlation-weighted average based on the predicted ice extent. The ...
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: 2009
ISSN: 0028-0836,1476-4687
DOI: 10.1038/nature08141