************************************************************************ IERS Message No. 451 March 07, 2022 ************************************************************************ Call for Abstracts: AOGS2022 SE03 Earth Rotation Session Dear Colleagues: The 2022 Asia Oceania Geosciences Society (AOGS) virtual annual meeting will be held during August 1 - August 5. This was originally planned as an in-person meeting in Singapore, and changed to virtual due to persistent pandemic situation. We would like to draw your attention to session SE03 on: Earth Rotation: Interpretation, Prediction, Uncertainty and Real-time Geodesy (see session description below). Please consider submitting an abstract to this session. The abstract submission deadline is extended to March 9, 2022 (https://www.asiaoceania.org/aogs2022/). Many thanks in advance! Jianli Chen, Henryk Dobslaw, Jose Ferrandiz, Richard Gross AOGS2022 SE03: Earth Rotation: Interpretation, Prediction, Uncertainty and Real-time Geodesy Convener: Jianli Chen Co-conveners: Henryk Dobslaw, Jose Ferrandiz, Richard Gross Earth rotation is driven by mass transport and redistribution within the Earth system, including the atmosphere, hydrosphere, ocean, cryosphere, mantle and core, govern by conservation of the global angular momentum. Although relatively small, Earth rotation has been measured by space geodetic techniques with increasing, unprecedented accuracy, opening up important new avenues of research that will lead to a better understanding of global mass transport processes and of the Earth's dynamic response. The current conventions specify the transformation between celestial and terrestrial reference frames by means of a rotation matrix depending on five Earth orientation parameters (EOP) that are monitored with the help of several international services. Any uncertainties of systematics affecting the EOP determined or predicted values have thus a direct geometrical counterpart on positioning any fixed or moving object relative to the Earth. In the case of satellites orbiting our planet, there is also an additional dynamical effect due to uncertainty of their locations in the geopotential field, which enlarges errors as orbits are propagated further and whose assessment is not straightforward - specially for satellite constellations. All these issues harm or may prevent important real time geodetic applications. In addition, advancements in modeling the Earth climate system and satellite gravimetry offer a means to better understand dynamical connections between Earth rotation and geophysical excitations in different components of the Earth system. This session welcomes contributions related to Earth rotation and EOP, the wide set of effects associated to EOP uncertainties, and the current efforts for improving its modeling, determination and prediction, as well as geophysical interpretations of Earth rotation. ************************************************************************ 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 ************************************************************************