Sentences with phrase «feedback climate»

A positive feedback the climate system itself has failed to display during many a big excursion of CO2 levels in the past, as well as in the present.

My hypothesis continues to be that the post feedback climate sensitivity to CO2 number, expressed as degrees C per doubling of atmospheric CO2 concentrations, is greater than zero and less than one.

It's also another piece of evidence that is consistent with fast feedback climate sensitivity of around 0.75 °C / W / m ².

Model studies for climate change between the Holocene and the Pliocene, when Earth was about 3 °C warmer, find that slow feedbacks due to changes of ice sheets and vegetation cover amplified the fast feedback climate response by 30 — 50 % [216].

It's also another piece of evidence that is consistent with fast feedback climate sensitivity of around 0.75 °C / W / m ².

The science that CO2 catastrophically warms the Earth, with a high positive feedback climate system driven to climate sensitivities to CO2 of 3C per doubling or higher is not solid.

One issue that I have wondered about for some time is to what extent the paleoclimate record supports the distinction between slow - feedback and fast - feedback climate sensitivity.

This empirical fast - feedback climate sensitivity allows water vapor, clouds, aerosols, sea ice, and all other fast feedbacks that exist in the real world to respond naturally to global climate change.

At its present temperature Earth is on a flat portion of its fast - feedback climate sensitivity curve.

In contrast, the 1000 GtC scenario, although nominally designed to yield a fast - feedback climate response of ∼ 2 °C, would yield a larger eventual warming because of slow feedbacks, probably at least 3 °C.

Hansen et al. 2013 (a) CO2 amount required to yield a global temperature, if fast - feedback climate sensitivity is 0.75 °C per W m − 2 and non-CO2 GHGs contribute 25 % of the GHG forcing.

In contrast, the 1000 GtC scenario, although nominally designed to yield a fast - feedback climate response of ∼ 2 °C, would yield a larger eventual warming because of slow feedbacks, probably at least 3 °C.

Model studies for climate change between the Holocene and the Pliocene, when Earth was about 3 °C warmer, find that slow feedbacks due to changes of ice sheets and vegetation cover amplified the fast feedback climate response by 30 — 50 % [216].

Therefore, albedo changes associated with sea ice are included in the fast feedback climate sensitivity, whereas albedo changes associated with ice sheets are only included in longer - term climate sensitivity estimates (which is termed «Earth System Sensitivity»).

The fast - feedback climate sensitivity is a reasonably smooth curve, because the principal fast - feedback mechanisms (water vapor, clouds, aerosols, sea ice) do not have sharp threshold changes.