Climate data Record of Stratospheric aerosols (CREST)

The Climate data REcord of STratospheric Aerosols (CREST) is derived from data by six limb and occultation satellite instruments: SAGE II on ERBS, GOMOS and SCIAMACHY on Envisat, OSIRIS on Odin, OMPS on Suomi-NPP, and SAGE III on International Space Station. The merged dataset was generated as a contribution to the European Space Agency project CREST (https://eo4society.esa.int/projects/crest/).
The merging of aerosols profiles is performed by transformation the aerosol datasets from individual satellite instruments to the same wavelength, i.e., 750 nm, and their homogenization by adjusting the seasonal cycles. The merged aerosol extinction coefficient is computed as the median of the adjusted data from the individual instruments.
The merged time series of monthly mean aerosol extinction vertical profiles at 750 nm is provided in 10 deg latitude bands from 90S to 90N, in the altitude range from 8.5 km to 39.5 km. The time series of stratospheric optical depth is created by integration of aerosol extinction profiles from the tropopause to 39.5 km; it is also provided as monthly mean data in 10 deg latitude bands. All the aerosol climate records cover the time period from October 1984 until December 2023, and they are intended be extended in the future.

平流层气溶胶气候数据集（Climate data REcord of STratospheric Aerosols，缩写CREST）源自6台临边与掩星型卫星载荷的数据，分别为搭载于ERBS卫星的SAGE II、搭载于Envisat卫星的GOMOS与SCIAMACHY、搭载于Odin卫星的OSIRIS、搭载于Suomi-NPP卫星的OMPS，以及搭载于国际空间站（International Space Station，缩写ISS）的SAGE III。本合并数据集是为欧洲空间局（European Space Agency，缩写ESA）CREST项目构建的贡献性数据集，项目官方页面可访问https://eo4society.esa.int/projects/crest/。
气溶胶廓线的合并流程为先将各卫星载荷的气溶胶数据集统一转换至750 nm这一统一波长，随后通过调整季节循环实现数据的均一化处理。合并后的气溶胶消光系数以各仪器校正后数据的中位数进行计算。
本数据集提供750 nm波长下的月均气溶胶消光垂直廓线合并时间序列，空间覆盖范围为南北纬90°间以10°为间隔的纬度带，垂直高度区间为8.5 km至39.5 km。平流层光学厚度时间序列则通过对流层顶至39.5 km范围内的气溶胶消光廓线积分得到，同样以10°为间隔的纬度带形式提供月均数据。
所有气溶胶气候记录的时间跨度为1984年10月至2023年12月，未来将进一步扩展该数据集的时间序列。