4f16ba43-61af-ba52-e063-3050940a9ea3 English nonGeographicDataset non geographic dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-05-06 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13608667 Top-heavy double-diffusive geodynamo simulations 2026-03-24 creation http://data.bgs.ac.uk/id/dataHolding/13608667 This dataset contains numerical simulations of bottom-heated, top-heavy double-diffusive geodynamo models in a rotating spherical shell. These models are designed to investigate geomagnetic signatures of possible stratified regions near the top of Earth’s outer core. The simulations span a range of thermal and compositional forcings, enabling the study of how lower-mantle heterogeneities and light element accumulation driven stratification may influence the geomagnetic field. The dataset provides: 1. Simulation state files (final state and time-averaged state) in NetCDF format. Due to the large size of full state outputs, only these two files are included. 2. Time-series outputs of key dynamical variables. 3. Post-processed diagnostic quantities, including spatial and temporal averages, kinetic energy budgets, forces relevant to double-diffusive dynamics [2], and metrics used to assess possible thermally and/or compositionally stratified layers near the core–mantle boundary. 4. Metrics to compare the simulation outputs with the features of geomagnetic field over various timescales. All simulations were produced using the Leeds Spherical Dynamo Code [3] and run on the ARCHER2 high-performance computing system. References [1] https://doi.org/10.48550/arXiv.2507.03538 [2] https://doi.org/10.1017/jfm.2025.259 [3] https://github.com/Leeds-Spherical-Dynamo/leeds-spherical-dynamo Jonathan Mound University of Leeds not available originator Souvik Naskar University of Leeds not available originator Christopher Davies University of Leeds not available originator Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available pointOfContact notApplicable https://resources.bgs.ac.uk/images/geonetworkThumbs/4f16ba43-61af-ba52-e063-3050940a9ea3.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Earth rotation Geomagnetism Convection Earth core Tectonics BGS Thesaurus of Geosciences 2022 revision Citable Data NGDC Deposited Data dataCentre NERC_DDC otherRestrictions licenceOGL Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" otherRestrictions The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused. Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" English geoscientificInformation 2024-07-01 2026-02-28 .dat NetCDF Enquiries British Geological Survey United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item191950 WWW:DOWNLOAD-1.0-http--download Data download https://doi.org/10.5285/5afa6648-268e-49d0-8b68-7468c19f24ac WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) Naskar, S., Mound, J. E., Davies, C. J. (2026). Top-heavy double-diffusive geodynamo simulations. NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/5afa6648-268e-49d0-8b68-7468c19f24ac information nonGeographicDataset non geographic dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false All the data was generated using the Leeds Spherical Dynamo code [1] and the associated postprocessing tools [2]. References: [1] https://github.com/Leeds-Spherical-Dynamo/leeds-spherical-dynamo [2] https://github.com/Leeds-Spherical-Dynamo/Post_processing