Atmospheric SO2 Ancillary Files for HadCM3

SO2 emissions are a major source of uncertainty for climate model studies. From the Coupled Model Intercomparison Project Phase 5 (CMIP5) historical data and representative concentration pathway (RCP) data is readily available for use in climate models. However the contribution from observational data ceases after 2005 and therefore simulations of the recent past are dependent on up to 10 year old projection data. Here the authors have made use of more recent observations and projection scenarios from the ECLIPSE_v5a global emissions dataset. The 5 yearly SO2 land observations have been combined with shipping data, split into surface and high level emissions, interpolated in time to give monthly values and converted to N96 in the data format used by the MetOffice HadCM3 family of climate models. Data is available for the baseline current legislation (CLE), climate 2 degrees CLE and mitigation of short-lived climate pollutants (SLCP) scenarios. To broaden the reuse of this data for other climate models both MetOffice ancillary files and NetCDF output files are included.二氧化硫（SO2）排放是气候模型研究领域不确定性的主要成因之一。耦合模式比较计划第五阶段（CMIP5）的历史数据与典型浓度路径（RCP）数据，均可直接用于气候模型研究。然而观测数据的贡献在2005年之后便终止，因此对近年气候的模拟需依赖至多10年前的投影数据。本研究的作者团队采用了ECLIPSE_v5a全球排放数据集的最新观测与投影情景数据。研究将每五年一次的陆地二氧化硫观测数据与航运排放数据相结合，将排放划分为地表与高空两类，并通过时间插值得到月尺度数据，最终转换为英国气象局（MetOffice）HadCM3系列气候模型所采用的N96数据格式。该数据集涵盖当前立法基线（CLE）、2℃气候目标CLE以及短寿命气候污染物（SLCP）减排三类情景下的数据。为便于该数据集在其他气候模型中的复用，本数据集同时提供英国气象局辅助文件与网络通用数据格式（NetCDF）输出文件。