************************************************************************ IERS Message No. 445 January 03, 2022 ************************************************************************ Earth rotation session at EGU 2022 Dear colleagues, As part of the EGU General Assembly 2022 (https://www.egu2022.eu/) that will be held as a hybrid meeting from 3 to 8 April 2022, we like to draw your attention to session G3.5 "Earth Rotation: Theoretical aspects, temporal variability, physical interpretation, and prediction" (https://meetingorganizer.copernicus.org/EGU22/session/43011). Below you can find the detailed description. We are looking forward to your contribution by submitting an abstract to our session through https://meetingorganizer.copernicus.org/EGU22/abstractsubmission/43011. The deadline to submit abstracts is 12 January 2022, 13:00 CET. Best regards, David Salstein (for the conveners) Earth Rotation: Theoretical aspects, temporal variability, physical interpretation, and prediction Convener: David Salstein Co-conveners: Sigrid Boehm, Alberto Escapa, Florian Seitz, Sara Bruni Abstract: Accurate modeling and prediction of Earth rotation is important for geodesy, astronomy and navigation, and relates to the variability of the circulation of the fluid components of the planet. Over the past years geodetic observation systems have made significant advances in monitoring Earth rotational motion and its variability, which must be accompanied by an enhancement of theories and models. We are interested in the progress in the theory of Earth rotation. We seek contributions that are consistent internally with the accurate observations at the mm-level, to meet the requirements of Global Geodetic Observing System and respond to IAG Res. 5. We invite presentations within the scope of the IAU/IAG JWG Improving Theories and Models of the Earth's Rotation. We welcome contributions that highlight new determinations, analyses, and predictions of Earth Orientation Parameters (EOP), including combinations of different geodetic and astrometric observational techniques for deriving UT1/length-of-day variations and polar motion. We welcome discussions of EOP solutions in conjunction with a consistent determination of terrestrial and celestial frames, as tackled in the IAG/IAU/IERS JWG Consistent Realization of TRF, CRF and EOP. We are particularly interested in results from the current 2nd EOP Prediction Comparison Campaign. We invite contributions of both the dynamical basis for links between Earth rotation, geophysical fluids, and other geodetic quantities, such as the Earth gravity field or surface deformation, and of explanations for the physical excitations of Earth rotation. Besides tidal influences from outside the Earth, the principal causes for variable EOP appear to be related to angular momentum exchange from variable motions and mass redistribution of the fluid portions of the planet. Observations and analyses of the geophysical fluids (e.g., atmosphere and oceans) have been continually improving over time, and independent observations include the results of gravity missions like GRACE. We welcome contributions about the relationship between EOP variability and current or potential variability in fluids due to climate variation or global change signals. Forecasts of these quantities are important especially for the operational determination of Earth orientation and the effort to improve predictions is an important topic. We also welcome input on the modeling, variability, and excitations of the rotation of other planetary bodies. ************************************************************************ IERS Messages are edited and distributed by the IERS Central Bureau. If not stated otherwise, the IERS is only the distributor of the message and is not responsible for its content. To submit texts for distribution, please write to . To subscribe or unsubscribe, please create an IERS account or modify it: https://www.iers.org/Login/Login/EN/login_node.html or write to . Archives: http://www.iers.org/Messages ************************************************************************