SORCE-SIM TSIS1-SIM Irradiance Calibration Ratio (STICR) V2.0

TSIS1-SIM Recalibration of the SORCE-SIM Absolute Irradiance Scale: V02

This is version 2.0 (V02.0) of the SORCE-SIM to TSIS-SIM Irradiance Calibration Ratio (STICR). This data product uses the temporal overlap of the Solar Radiation and Climate Experiment (SORCE) and the Total and Spectral Solar Irradiance Sensor (TSIS-1) Spectral Irradiance Monitor (SIM) instruments to create an alternate SORCE-SIM irradiance calibration.

The STICR is the mean TSIS-SIM/SORCE-SIM irradiance ratio during the temporal overlap between the two missions (on the L3 SORCE-SIM wavelength scale). The STICR, SORCE-SIM, and TSIS1-SIM mean spectra, plus all ancillary data needed to understand how this ratio was determined are contained in this data product. STICR (V02) is used to create V02 of the SORCE-SIM TSIS-1 Adjusted Values (TAV) irradiance data product (https://doi.org/10.5067/8E8EG9HHVDZS).

In simple terms:
SORCE-SIM V27 (irradiance) * STICR V02 = SORCE-SIM TAV V02 (irradiance).

STICR and TAV V02 use TSIS-SIM V06 and SORCE-SIM V27 publicly available data releases. The STICR data products are housed here, at CU Scholar — a collaborative service of the University of Colorado Libraries and are available in ASCII and IDL SAVfile format at https://doi.org/10.25810/22v9-9s08.

The TAV V02 data product appears in ASCII format in two locations:

LASP SORCE website: http://lasp.colorado.edu/home/sorce/data/, and
NASA DAAC: https://disc.gsfc.nasa.gov/datasets/SOR3SIMD_TAV_002/summary/.

An IDL file reader (http://lasp.colorado.edu/data/sorce/file_readers/read_lasp_ascii_file.pro) is available which will read the TAV or attached STICR ASCII file (sorce_sim_L3_tav_cal_v02.0.txt) and return an array of structures whose field names and types are defined in the attached release notes. The STICR IDL SAVfile available on this website (sorce_sim_L3_tav_cal_v02.0.sav) contains all the information in the ASCII file, plus additional information such as the specific days during the SORCE-SIM and TSIS1-SIM temporal overlap which were used in the determination of the STICR.

The TAV V02 data product appears in NetCDF format in two locations:

LASP SORCE website: http://lasp.colorado.edu/home/sorce/data/, and
LASP LISIRD website: http://lasp.colorado.edu/lisird/data/sorce_sim_tav_l3b/

The TAV V02.0 data product is also available as an IDL SAVfile from the LASP website: https://lasp.colorado.edu/home/sorce/data/.

STICR V01.1 differed from V1.0 in that the TSIS ground calibration error estimate was been removed from the TSIS_UNC column and placed into the TSIS_CAL_ERR column.

STICR V02.0 differs from V1.1 in that

all irradiances and ratios are now double-precision values,
the version of TSIS1-SIM used was updated from V05 to V06,
the TAVR_VER (TAV_RATIO version number) column was changed from an I3 to an F5.1 to allow subversions, and
the IDL SAVfile STICR.AUTOCORR structure now includes an array named NUSED_PER_ABIN to document the number of spectra used for each autocorrelation bin for each wavelength.

Complete details on the STICR creation and attached data sets are contained in the included release notes.

TSIS1-SIM 对 SORCE-SIM 绝对辐照度标尺的重新校准：V02 版本

本数据集为SORCE-SIM至TSIS-SIM辐照度校准比值（SORCE-SIM to TSIS-SIM Irradiance Calibration Ratio, STICR）的2.0版本（V02.0）。本数据产品利用太阳辐射与气候实验卫星（Solar Radiation and Climate Experiment, SORCE）与全光谱太阳辐照度传感器（Total and Spectral Solar Irradiance Sensor, TSIS-1）的光谱辐照度监测仪（Spectral Irradiance Monitor, SIM）的时间重叠观测数据，构建了一套替代的SORCE-SIM辐照度校准方案。

STICR指两项任务时间重叠观测期内（基于L3级SORCE-SIM波长标尺）TSIS-SIM与SORCE-SIM辐照度的平均比值。本数据产品包含STICR、SORCE-SIM及TSIS1-SIM的平均光谱，以及用于阐明该比值推导过程的全部辅助数据。STICR（V02）可用于生成SORCE-SIM TSIS-1校正值（TSIS-1 Adjusted Values, TAV）辐照度数据产品的V02版本（https://doi.org/10.5067/8E8EG9HHVDZS）。

简言之：SORCE-SIM V27（辐照度） × STICR V02 = SORCE-SIM TAV V02（辐照度）。

STICR与TAV V02采用公开发布的TSIS-SIM V06及SORCE-SIM V27数据。STICR数据产品由科罗拉多大学图书馆协作服务平台CU Scholar托管，可通过https://doi.org/10.25810/22v9-9s08获取ASCII与IDL SAVfile格式的数据。

TAV V02的ASCII格式数据可从以下两处获取：
1. LASP SORCE官网：http://lasp.colorado.edu/home/sorce/data/
2. NASA DAAC：https://disc.gsfc.nasa.gov/datasets/SOR3SIMD_TAV_002/summary/

配套提供的IDL文件读取工具（http://lasp.colorado.edu/data/sorce/file_readers/read_lasp_ascii_file.pro）可读取TAV或附带的STICR ASCII文件（sorce_sim_L3_tav_cal_v02.0.txt），并返回字段名称与类型详见附带发布说明的结构数组。本网站提供的STICR IDL SAVfile（sorce_sim_L3_tav_cal_v02.0.sav）包含ASCII文件的全部信息，还额外包含用于推导STICR的SORCE-SIM与TSIS1-SIM时间重叠观测期内的具体观测日期等内容。

TAV V02的NetCDF格式数据可从以下两处获取：
1. LASP SORCE官网：http://lasp.colorado.edu/home/sorce/data/
2. LASP LISIRD官网：http://lasp.colorado.edu/lisird/data/sorce_sim_tav_l3b/

TAV V02.0数据产品也可通过LASP官网以IDL SAVfile格式获取：https://lasp.colorado.edu/home/sorce/data/。

STICR V01.1相较于V1.0的调整为：移除了TSIS_UNC列中的TSIS地面校准误差估计值，并将其归入TSIS_CAL_ERR列。

STICR V02.0相较于V1.1的调整包括：
1. 所有辐照度与比值均采用双精度数值格式；
2. 所用TSIS1-SIM版本从V05更新至V06；
3. TAVR_VER（TAV_RATIO版本号）列的数据类型从I3更改为F5.1以支持子版本号；
4. IDL SAVfile中的STICR.AUTOCORR结构新增了名为NUSED_PER_ABIN的数组，用于记录每个波长下每个自相关分箱所使用的光谱数量。

有关STICR的构建流程及附带数据集的完整细节，请参阅附带的发布说明。