Climate Feedbacks Brian Soden Rosenstiel School of Marine and Atmospheric Science University of Miami.

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Presentation transcript:

Climate Feedbacks Brian Soden Rosenstiel School of Marine and Atmospheric Science University of Miami

Physics of Climate Change In Equilibrium Absorbed Solar = Outgoing IR Instantly double CO2 Absorbed Solar > Outgoing IR 240 W/m2 236 W/m2 Surface Temperature Warms Outgoing IR increases until Absorbed Solar = Outgoing IR Ts = 287 KTs = ??? K

Global Mean Surface Temperature Key Climate Feedbacks IPCC AR4 GCMs Direct Forcing of CO2 + water vapor + snow/ice + clouds Consistent across models

Climate Feedback A sequence of interactions that may amplify (positive) or dampen (negative) the response of the climate to an initial perturbation. Example: Snow/Ice Feedback Surface T Ice/Snow Cover Absorbed Sunlight - - +

Water Vapor Feedbacks Surface T H 2 O Vapor Greenhouse Effect All models predict a strong positive feedback from water vapor.

IPCC Assessments: Water Vapor Feedback 1990: “The best understood feedback mechanism is water vapor feedback, and this is intuitively easy to understand”

Water Vapor Feedback Ocean Surface Temperature (K) Atmospheric Water Vapor (kg/m 2 ) Greenhouse Effect (W/m 2 ) 1. Warmer oceans  more water vapor. 2. More water vapor  larger Greenhouse Effect. 3. Larger GHE  warmer oceans. Satellite observations illustrate how water vapor enhances regional differences in ocean temperature

IPCC Assessments: Water Vapor Feedback 1990: “The best understood feedback mechanism is water vapor feedback, and this is intuitively easy to understand” 1992: “There is no compelling evidence that water vapor feedback is anything other than positive—although there may be difficulties with upper tropospheric water vapor” 1995: “Feedback from the redistribution of water vapor remains a substantial source of uncertainty in climate models” 2001: “The balance of evidence favours a positive clear-sky water vapour feedback of magnitude comparable to that found in (model) simulations“ 2007: “Observational and modelling evidence provide strong support for a combined water vapour/lapse rate feedback of around the strength found in GCMs”

Testing Model Predictions of Water Vapor El Nino (warm) La Nina (cold) El Nino La Nina Pinatubo Models capture: Moistening of tropical atmosphere during warm (El Nino) events. Drying of tropical atmosphere during cold (La Nina) events.

Eruption of Mt. Pinatubo June 1991 Global Cooling and Drying after Mt. Pinatubo Atmosphere cools and dries following eruption. Climate models successfully reproduce observed cooling and drying. Temperature (C) Water Vapor (mm)

Testing Water Vapor Feedback Observed Model without water vapor feedback significantly underestimates cooling. Water vapor amplifies pre-existing temperature change (either warming or cooling).

Cloud Feedback Reflected Sunlight Cloud Cover Surface T + ? - Greenhouse Effect Cloud feedback is uncertain in both magnitude and sign. + +

The Problem Clouds The Problem Clouds Regional contribution to intermodel spread in cloud feedback Subtropical marine stratocumulus clouds are responsible for most (~2/3) of the uncertainty in cloud feedback in current models.

Thank You! Questions?

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