Joint Seminar: Earth’s Albedo and its Symmetry

Despite surface asymmetries, top of the atmosphere temporally & hemispherically averaged reflected solar irradiance appears symmetric over Northern/Southern hemispheres. In our work we established this fact with the use of surrogate time-series, and provided margins of 0.1±0.28Wm−2 for possible hemispheric differences supported by Clouds and Earth's Radiant System data and that models should satisfy to properly capture the effect. It turns out that extratropical storm track cloudiness is responsible for balancing surface asymmetries and bringing an overall symmetric albedo, which we showed by creating a new cloud albedo field. We further analyzed time-series of reflected irradiance in search of the properties a symmetry-establishing mechanism should satisfy. We found that the timeseries are almost entirely (99%) seasonal variations, superimposed with uncorrelated noise. The residual timeseries however contain a global trend that is large, as compared to expected albedo feedbacks. It is also hemispherically symmetric, and thus indicates the possibility of a symmetry enforcing mechanism at longer timescales.

Date

26.10.2021

Time

15:15 h

Place

Virtual Seminar
Hamburg

Speaker

George Datseris, Max-Planck-Institut für Meteorologie

Organizers

Diego Jiménez-de-la-Cuesta Otero

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