Mean sea-level pressure and related indices from control and tropical relaxation winter seasonal hindcasts using the Met Office GloSea5 system.

© Crown Copyright, Met Office The accompanying data is made available under the terms of the Non-Commercial Government Licence (http://www.nationalarchives.gov.uk/doc/non-commercial-government-licence/version/2/). These data are the results of ensemble modelling simulations using the Met Office GloSea5 numerical seasonal prediction system. Files in (zipped) netcdf format contain winter seasonal-mean mean sea-level pressure (MSLP) fields for each member of specified ensemble and hindcast winter (December-February from 1993-94 to 2015-16). The files are named according to the specification of relaxation towards observational reanalysis in each. HCAST has no relaxation, ALL has tropical (approximately 22.5S to 22.5N) relaxation at all atmospheric heights, TROP is similar to ALL but with relaxation limited to below 18km and STRAT is similar to ALL but with relaxation limited to above 18km. The relaxation is designed to constrain the atmospheric state to be close to that which was observed within the domain over which it is applied. Details of the technique can be found in Maidens et al., 2021* and references therein. An additional text file is provided to give summary statistics of key MSLP-based winter indices. * Maidens, A., Knight, J. R., & Scaife, A. A. (2021). Tropical and stratospheric influences on winter atmospheric circulation patterns in the North Atlantic sector. Environmental Research Letters, 16, 024035. https://doi.org/10.1088/1748-9326/abd8aa© 英国王室版权，英国气象局（Met Office）。配套数据依据非商业政府许可条款发布（http://www.nationalarchives.gov.uk/doc/non-commercial-government-licence/version/2/）。 本数据集为采用英国气象局GloSea5数值季节预报系统开展的集合模拟试验结果。 （压缩）格式的netCDF文件包含指定集合各成员的冬季季节平均海平面气压（mean sea-level pressure, MSLP）场，覆盖1993-94至2015-16年间的预报及后报冬季（12月-次年2月）数据。 文件命名依据各试验中向观测再分析数据施加松弛约束的配置方案而定：HCAST无松弛约束；ALL方案在所有大气高度层均对热带区域（约南纬22.5°至北纬22.5°）施加松弛约束；TROP方案与ALL类似，但仅在18km以下高度施加松弛约束；STRAT方案与ALL类似，但仅在18km以上高度施加松弛约束。 该松弛约束方法旨在将模拟的大气状态约束在其作用区域内，使其尽可能贴近该区域内的观测值。该方法的详细技术细节可参见Maidens等人2021年的研究*及其中引用的参考文献。 另附一份文本文件，包含基于MSLP的关键冬季指数的汇总统计量。 * Maidens, A., Knight, J. R., & Scaife, A. A. (2021). 北大西洋区域冬季大气环流型的热带与平流层影响. 《环境研究快报》, 16, 024035. https://doi.org/10.1088/1748-9326/abd8aa