Development of a diffuse reflectance probe for in situ measurement of inherent optical properties in sea ice

Included are the data presented in the publication entitled: <em>Development of a diffuse reflectance probe for in situ measurement of inherent optical properties in sea ice</em> accepted for publication in The Cryosphere Journal (2021). The data set includes Data and codes: 1. Data (duplicated in .xlsx and .mat): 1.1 Sites coordinates- (figure 5) -Geolocalisation of both sea ice sampling sites visited for this study (1 and 4) 1.2 cumu_sg- (figure 6)- cumulative signal vs depth vs source-detector distance vs scattering coefficient obtained with Monte Carlo simulations —cumu_sg- cumulative signal (%) — depth (mm) —standard deviation on depth where signal is cumulated —ddet (mm)- radial distance between source and detection point — b (m^-1)-scattering coefficient 1.3 validation-(figure 7)- Error on IOPs vs IOP value estimated measuring on microspheres solutions —vf (-)- microspheres volume fraction (in water) —a_theo (m^-1) - theoretical value of the absorption coefficient — mean_error_a(%) - error between theoretical value and measured value —std_error_a_x (%) - standard deviation on theoretical value (based on the standard deviation on microspheres diameter) —std_error_a_y (%) -standard deviation on error_a —rb_theo (m^-1) - theoretical value of the reduced scattering coefficient —mean_error_rb(%) - error between theoretical value and measured value —std_error_rb_x (%) - standard deviation on theoretical value (based on the standard deviation on microspheres diameter) —std_error_rb_y (%)) -standard deviation on error_rb —gamma_theo (-) - theoretical value of gamma —mean_error_gamma (%) - standard deviation on theoretical value (based on the standard deviation on microspheres diameter) —std_error_gamma (%) - standard deviation on error_gamma -1.4 T-S-(figure 8)- Vertical profiles of temperature and bulk salinity of sampled sea ice available at both snow covered site 1 and bare ice site 4 —T (celsius) - ice temperature —S_si (ppt) - ice bulk salinity —depth (cm) 1.5 Rmes-(figure 9)-Vertical profiles of spatially resolved diffuse Reflectance in sea ice using different covers to shade available at both snow covered site 1 and bare ice site 4 —Rmes (-) - spatially resolved diffuse Reflectance —Rmes_nbg (-) - spatially resolved diffuse Reflectance with no background sunlight subtraction in calculation of Rmes —dmes (mm) - distance between source and detecting fibre (named rho in the paper) —depth (cm) — cover - cover used to shade from the sun: te=tent,nc= no cover, ta=tarp 1.6 IOPprofiles-(figure 9)-Vertical profiles of reduced scattering coefficient in sea ice using different covers to shade available at both snow covered site 1 (ice+snow) and bare ice site 4 —infferedrb (m^-1) - reduced scattering coefficient —infferedrb_nbg (m^-1) - reduced scattering coefficient with no background sunlight subtraction in calculation of Rmes —cr1 (binary)— criteria determining if the measurement is kept or not —depth (cm)- depth from the surface . **watch out** at site 1 , the measurments start from the surface of the snow. Substract 24 cm to get measurement from surface of the ice. — cover - cover used to shade from the sun: te=tent,nc= no cover, ta=tarp 2. Code (written in .m with MATLAB_R2018b ®) : 2.1 inversion algorithm—(figure 9 ) — used to find rb from Rmes (dmes) vertical profiles in sea ice — Main_vprofiles_Rtorb-qik2019_article.m - Main script of the inversion alorithm to get rb from Rmes (dmes) —importfiledata.m-subfunction to import data from .csv —importfiledatamay8.m-subfunction to import data from .csv (specific to may 8th because file was corrupted) —interp1lookup_HR_enlarged_bin10.mat - lookup table of Reflectance vs dmes vs a vs b’ vs gamma used in the inversion —calibjune6_ha_interp1_indcalib2.mat - calibration factor with microspheres as a reference —site1_c20-picture of the ice core taken at site 1 —site4_c20-picture of the ice core taken at site 4 —may8th+othertests_fixed.csv-raw data from may 8 (site1) —may9day3.csv-raw data from may 9 (site4)本数据集包含已被《冰冻圈期刊（The Cryosphere Journal）》接收并将于2021年发表的论文《用于原位测量海冰固有光学性质的漫反射探头研发（Development of a diffuse reflectance probe for in situ measurement of inherent optical properties in sea ice）》中的相关数据与代码。 数据集包含数据与代码两部分： 1. 数据（以.xlsx与.mat双格式备份）： 1.1 站点坐标（对应图5）：本研究走访的两处海冰采样站点（站点1与站点4）的地理定位信息。 1.2 cumu_sg（对应图6）：通过蒙特卡洛模拟（Monte Carlo simulations）得到的累积信号、测量深度、源探间距与散射系数的对应关系，包含以下字段： - cumu_sg (-)：累积信号百分比 - depth (mm)：测量深度 - std_depth (%)：信号累积深度的标准差 - ddet (mm)：光源与探测点的径向间距 - b (m^-1)：散射系数 1.3 验证集（对应图7）：基于微球溶液实测得到的固有光学性质（inherent optical properties, IOPs）估算值与误差的对应关系，包含以下字段： - vf (-)：水中微球体积分数 - a_theo (m^-1)：吸收系数理论值 - mean_error_a(%)：实测值与理论吸收系数的误差 - std_error_a_x (%)：基于微球直径标准差计算的理论吸收系数标准差 - std_error_a_y (%)：误差mean_error_a的标准差 - rb_theo (m^-1)：约化散射系数（reduced scattering coefficient）理论值 - mean_error_rb(%)：实测值与理论约化散射系数的误差 - std_error_rb_x (%)：基于微球直径标准差计算的理论约化散射系数标准差 - std_error_rb_y (%)：误差mean_error_rb的标准差 - gamma_theo (-)：gamma理论值 - mean_error_gamma (%)：实测值与理论gamma值的误差 - std_error_gamma (%)：误差mean_error_gamma的标准差 1.4 T-S（对应图8）：积雪覆盖的站点1与裸冰站点4的采样海冰温度与体盐度垂直剖面，包含以下字段： - T (℃)：海冰温度 - S_si (ppt)：海冰体盐度 - depth (cm)：测量深度 1.5 Rmes（对应图9）：在积雪覆盖的站点1与裸冰站点4，使用不同遮阳设备获取的海冰空间分辨漫反射反射率（diffuse Reflectance）垂直剖面，包含以下字段： - Rmes (-)：空间分辨漫反射反射率 - Rmes_nbg (-)：未扣除背景太阳光的空间分辨漫反射反射率（用于Rmes计算） - dmes (mm)：光源与探测光纤的间距（论文中记为rho） - depth (cm)：测量深度 - cover：遮阳设备类型：te=帐篷（tent），nc=无遮阳，ta=防水布（tarp） 1.6 IOPprofiles（对应图9）：在积雪覆盖的站点1（冰+雪）与裸冰站点4，使用不同遮阳设备获取的海冰约化散射系数垂直剖面，包含以下字段： - infferedrb (m^-1)：反演得到的约化散射系数 - infferedrb_nbg (m^-1)：未扣除背景太阳光的Rmes计算得到的约化散射系数 - cr1 (binary)：判定测量结果是否保留的二进制判据 - depth (cm)：测量深度。**注意**：站点1的测量起始点为积雪表面，若需换算为海冰表面深度，需减去24 cm。 - cover：遮阳设备类型：te=帐篷，nc=无遮阳，ta=防水布 2. 代码（基于MATLAB_R2018b ® 编写的.m文件）： 2.1 反演算法（对应图9）：用于从海冰Rmes(dmes)垂直剖面反演得到约化散射系数rb，包含以下脚本与函数： - Main_vprofiles_Rtorb-qik2019_article.m：反演算法主脚本，用于从Rmes(dmes)获取rb - importfiledata.m：导入.csv格式数据的子函数 - importfiledatamay8.m：导入.csv格式数据的专用子函数（适配5月8日数据，因原始文件存在损坏） - interp1lookup_HR_enlarged_bin10.mat：反演过程中使用的反射率-源探间距-吸收系数-约化散射系数-gamma查找表 - calibjune6_ha_interp1_indcalib2.mat：以微球为参考的校准因子 - site1_c20：站点1冰芯实拍照片 - site4_c20：站点4冰芯实拍照片 - may8th+othertests_fixed.csv：5月8日（站点1）原始实测数据 - may9day3.csv：5月9日（站点4）原始实测数据