Earth’s energy balance
Measurement, assessment, processes
See webex information following abstract
This presentation will cover multiple aspects of my research on Earth's energy balance and planetary heat uptake. We will discuss different approaches to estimate Earth’s energy imbalance (EEI) including the assessment of the contemporary sea level budget using Argo, altimetry and GRACE/GRACE-FO observations. Although the sea level budget has been considered closed in most published research, we find a noticeable gap potentially attributable to enhanced ocean heat uptake. Nevertheless, the slightly higher EEI deduced from the sea level data is still in line with some of the higher published estimates and indicates a slight acceleration of planetary heat uptake between 2005 and 2018.
Looking into the future, we will present ideas for a potential observing system that measures radiation pressure variations directly linked to radiation fluxes entering and exiting our climate system. This approach is thought to provide most direct and high-accuracy measurements of net radiative flux from space needed to quantify EEI and its uncertainty.
In light of the recent NASA EVC-1 selection, we will also briefly present some of the goals of the Libera mission and its overall significance for the community. Not only does Libera provide critical continuity of the 40-year radiation flux record but introduces innovative technology to enhance scientific merit and to meet the future needs of smaller and cost-effective observation systems.
To close, we will use such satellite-based radiation flux data, as currently provided by CERES, in conjunction with a variety of cloud and other meteorological variables, originating from CloudSat, CALIPSO, and COSMIC, to delve into the drivers of present-day net radiation flux variability in the tropics. We find that the modulation of shortwave flux through cloud optical thickness changes is a major contribution to tropical net radiative flux variability in response to equatorial surface warming such as induced by ENSO.
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Meeting number (access code): 199 443 7334
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Wednesday, July 1, 2020
1:15 pm | Eastern Daylight Time (New York, GMT-04:00) | 1 hr 30 mins
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