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In last great age of warmth, CO2 at work — but hardly alone

By Guest PostApril 4, 2013Environmentactual temperature patterns, aerosol composition, alexey fedorov, central america, chris brierley, climate, climate change, climate forcing, cloud feedbacks, CO2, coast of peru, dynamic factors, earth, el nino conditions, global warmth, high latitudes, indonesia, kira lawrence, last great age, meaningful predictions, modern temperature patterns, ocean mixing, past, petra dekens, pliocene climate, pliocene warming, simulation, subtropical waters, tectonic changes, tropics, typical climate model, university college london, warming pattern, warmth, yale university, zhonghui liu

Warming patterns during Earth’s last period of prolonged global warmth differed dramatically from modern temperature patterns, according to new research by a Yale University scientist and colleagues. Cloud feedbacks, ocean mixing, or other dynamic factors must have played a greater role in Pliocene warming than commonly recognized, the scientists argue, and these must be accounted for in order to make meaningful predictions about Earth’s future climate.

In a paper published April 4 in the journal Nature, Yale climate scientist Alexey Fedorov and colleagues compile records of sea surface temperatures going back five million years, to the early Pliocene. These records reveal a world with fairly uniform warm temperatures in the whole of the Tropics prior to 4 million years ago — a significant scenario that typical climate model simulations fail to show. (more…)

Yale-led Team Finds CO2 Levels Plunged as Antarctica Froze

By Guest PostDecember 3, 2011Environmentalgae, atmosphere, carbon dioxide levels, climate transition, co2 and climate change, critical condition, cryosphere, earth, eocene epoch, eocene to oligocene, freezing of antarctica, fundamental link, geochemist, global climate change, global cooling, greenhouse gases, ice sheets, icing of antarctica, mark pagani, matthew huber, molecules, oligocene, polar ice caps, robert m deconto, sea level, temperatures, yale university, zhonghui liu

A Yale University-led research team has found evidence that carbon dioxide levels in Earth’s atmosphere plunged prior to and during the initial icing of Antarctica, about 34 million years ago. The new findings provide further evidence of atmospheric carbon dioxide’s role as a major trigger of global climate change.

“CO2 is tracking global cooling at that time,” said Yale geochemist Mark Pagani, lead author of a paper published online Dec. 1 in the journal Science. “It’s important to demonstrate that there are obvious linkages between CO2 and climate change. It’s one more piece of evidence that CO2 is a primary lever on climate.” (more…)

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In last great age of warmth, CO2 at work — but hardly alone

Yale-led Team Finds CO2 Levels Plunged as Antarctica Froze