What is the climate sensitivity factor?
Climate sensitivity is typically defined as the global temperature rise following a doubling of CO2 concentration in the atmosphere compared to pre-industrial levels. Pre-industrial CO2 was about 260 parts per million (ppm), so a doubling would be at roughly 520 ppm.
What is the climate feedback parameter?
A climate feedback is quantified through its climate feedback parameter, given by the change in downward TOA flux for a given temperature change. Thus, an increase in downward TOA flux with warming temperatures yields a positive climate feedback parameter.
What would be climate sensitivity be with no feedbacks?
The IPCC defines climate sensitivity as “a metric used to characterise the response of the global climate system to a given forcing. The no feedback sensitivity is the direct response of the surface temperature to radiative forcing by the increased CO2, without any feedbacks. …
How do we estimate historic temperatures and CO2 concentrations?
[Answer: Ice cores are tubes of ice that are drilled out of glaciers or ice sheets. Ice cores provide scientists with information about historical temperatures, gases that were present in the atmosphere in the past, and other clues about the Earth’s climate. Ice cores can date back many hundreds of thousands of years.]
What is the most important feedback involved in co2 climate sensitivity?
This positive feedback is known as the “water vapour feedback.” It is the primary reason that climate sensitivity is substantially greater than the previously stated theoretical value of 0.25 °C (0.45 °F) for each increase of 1 watt per square metre of radiative forcing.
What are climate feedback mechanisms?
A change in the climate. A negative feedback acts in the opposite direction to the main trend, and a positive feedback works in the same direction as the main trend. … So, in terms of global warming. More, a negative feedback has a cooling effect, while a positive feedback increases warming.
What is climate sensitivity quizlet?
Terms in this set (9) Climate Sensititivity. the measure of how much the Earth’s global mean temperature will change in response to radiative forcing. Radiative Forcing. a change in the balance between incoming solar radiation and outgoing thermal radiation.