Supporting dataset for "Multi-model assessment of the atmospheric and radiative effects of supersonic transport aircraft"

This dataset is a supporting dataset for "Intermodel comparison of the atmospheric composition changes due to emissions from a potential future supersonic aircraft fleet" (https://doi.org/10.5194/acp-25-2515-2025). This dataset contains all data necessary to reproduce the results of the publication.<br>In this work four state-of-the-science atmospheric chemistry transport models (EMAC, GEOS-Chem, LMDZ-INCA, MOZART-3) are used to evaluate the effects of three supersonic emission scenarios on a 2050 atmosphere. The future atmosphere and emissions are based on the SSP 3.7 scenario.<br>For each of the models this dataset includes the volume mixing ratio (vmr) and mass distribution of several key species through the atmosphere during the last years of model integration. The LMDZ-INCA and GEOS-Chem data span a 3 year interval, whereas 6 years of data is provided for EMAC and the MOZART-3 data is already annually averaged. We refer to the associated publication for more information regarding these timescales.<br>The dataset contains atmospheric histories for 4 different emission scenarios, denoted as A0 to A3. The A0 scenario is a baseline scenario with no supersonic aviation (only subsonic). In the A1 scenario part of the subsonic civil aviation is replaced by supersonic aircraft operating at mach 2/0. Scenario A2 is a variant of A1 with triple the emission of nitrogen oxides from the supersonic aircraft, and scenario A3 considers the partial replacement of subsonic civil aviation with mach 1.6 supersonic aircraft instead at a lower cruise altitude. For detailed descriptions of the scenarios we refer to the associated publication.<br>The files are named using the following convention (MODEL)_(SCENARIO)_(VARIABLE).nc4, for example the file GEOS-Chem_A1_H2O_mass.nc4 contains H2O mass distributions for the A1 scenario from the GEOS-Chem model. The following variables are included in this dataset:<br>halogen_vmr: Volume mixing ratios of halogen species (time, lat, lon, pressure) [mol mol-1]H2O_mass: Mass distribution of H2O (time, lat, lon, pressure) [kg]H2O_vmr: Volume mixing ratio of H2O (time, lat, lon, pressure) [mol mol-1]NOx_mass: Mass distribution of NOx (time, lat, lon, pressure) [kg (NO2)]NOx_vmr: Volume mixing ratio of NOx (time, lat, lon, pressure) [mol mol-1]NOy_vmr: Volume mixing ratio of NOy (time, lat, lon, pressure) [mol mol-1]O3_columns: Ozone columns in dobson units (time, lat, lon) [DU]O3_mass: Mass distribution of O3 (time, lat, lon, pressure) [kg]O3_vmr: Volume mixing ratio of O3 (time, lat, lon, pressure) [mol mol-1]OddOx_ClOxBrOx_loss: Odd Oxygen loss rate to ClOx and BrOx families (time, lat, lon, pressure) [molec cm-3 s-1] (For EMAC split into ClOx and BrOx files separately)OddOx_HOx_loss: Odd Oxygen loss rate to HOx family (time, lat, lon, pressure) [molec cm-3 s-1]OddOx_NOx_loss: Odd Oxygen loss rate to NOx family (time, lat, lon, pressure) [molec cm-3 s-1]OddOx_Ox_loss: Odd Oxygen loss rate to Ox family (time, lat, lon, pressure) [molec cm-3 s-1]BC_mmr: Mass mixing ratio of black carbon (time, lat, lon, pressure) [kg m-3]SO4_mmr: Mass mixing ratio of sulfate (time, lat, lon, pressure) [kg m-3]tropopause_pressure: Model tropopause pressure (time,lat,lon) [hPa]temp: Atmospheric temperature fields; only for EMAC. (time,lat,lon,pressure) [Kelvin]<br>For the MOZART-3 model some data is provided as differences instead, where the SCENARIO entry of (A1-A0) indicates a file with data of the difference between the respective fields of the A1 and A0 scenarios.<br>

本数据集为论文《潜在未来超音速机队排放导致的大气成分变化的模式间对比》（https://doi.org/10.5194/acp-25-2515-2025）的配套数据集，包含复现该论文研究成果所需的全部数据。
本研究采用4套当前主流的大气化学传输模式（EMAC、GEOS-Chem、LMDZ-INCA、MOZART-3），评估3种超音速排放情景对2050年大气的影响。未来大气状态及排放情景基于SSP 3.7情景。
针对每个模式，本数据集包含模式积分末期若干关键物种的大气体积混合比（volume mixing ratio, vmr）与质量分布。其中LMDZ-INCA与GEOS-Chem的数据时间跨度为3年，EMAC的数据跨度为6年，而MOZART-3的数据已按年平均处理。有关上述时间尺度的详细信息，请参阅相关发表论文。
本数据集包含4种不同排放情景的大气历史数据，分别记为A0至A3。情景A0为无超音速航空（仅保留亚音速航空）的基准情景。情景A1中，部分亚音速民用航空被马赫数2.0的超音速飞机替代。情景A2是A1的变体，其超音速飞机排放的氮氧化物量为A1的三倍；情景A3则考虑用巡航高度更低的马赫数1.6超音速飞机部分替代亚音速民用航空。有关各情景的详细描述，请参阅相关发表论文。
数据文件采用如下命名规范：(模式名)_(情景名)_(变量名).nc4，例如文件GEOS-Chem_A1_H2O_mass.nc4包含GEOS-Chem模式下A1情景的H2O质量分布。本数据集包含的变量如下：
halogen_vmr：卤素物种体积混合比（维度：时间、纬度、经度、气压，单位：mol mol-1）
H2O_mass：H2O质量分布（维度：时间、纬度、经度、气压，单位：kg）
H2O_vmr：H2O体积混合比（维度：时间、纬度、经度、气压，单位：mol mol-1）
NOx_mass：NOx质量分布（维度：时间、纬度、经度、气压，单位：kg（以NO2计））
NOx_vmr：NOx体积混合比（维度：时间、纬度、经度、气压，单位：mol mol-1）
NOy_vmr：NOy体积混合比（维度：时间、纬度、经度、气压，单位：mol mol-1）
O3_columns：臭氧柱总量（维度：时间、纬度、经度，单位：多布森单位（DU））
O3_mass：O3质量分布（维度：时间、纬度、经度、气压，单位：kg）
O3_vmr：O3体积混合比（维度：时间、纬度、经度、气压，单位：mol mol-1）
OddOx_ClOxBrOx_loss：奇氧（OddOx）与ClOx、BrOx家族的损耗速率（维度：时间、纬度、经度、气压，单位：molec cm-3 s-1，EMAC模式将其拆分为ClOx与BrOx两个单独文件）
OddOx_HOx_loss：奇氧与HOx家族的损耗速率（维度：时间、纬度、经度、气压，单位：molec cm-3 s-1）
OddOx_NOx_loss：奇氧与NOx家族的损耗速率（维度：时间、纬度、经度、气压，单位：molec cm-3 s-1）
OddOx_Ox_loss：奇氧与Ox家族的损耗速率（维度：时间、纬度、经度、气压，单位：molec cm-3 s-1）
BC_mmr：黑碳质量混合比（维度：时间、纬度、经度、气压，单位：kg m-3）
SO4_mmr：硫酸盐质量混合比（维度：时间、纬度、经度、气压，单位：kg m-3）
tropopause_pressure：模式对流层顶气压（维度：时间、纬度、经度，单位：hPa）
temp：大气温度场，仅EMAC模式包含该变量（维度：时间、纬度、经度、气压，单位：开尔文）
针对MOZART-3模式，部分数据以差值形式提供，此时文件名中的情景字段为(A1-A0)，表示该文件包含A1与A0情景对应变量的差值数据。