To what extent do sea ice algae affect the transmittance of PAR to the ice-ocean interface?

The manuscript has been accepted for publication 28/5/24. THIS IS THE UPDATED VERSION. Data used in the study presented by BHRR and MDK. For the PAR profile data (e.g., Sum_150.dat), the number refers to the column-integrated concentration mg chl-a m2. The columns in the files are as follows, e.g.: 1 2 3 4 5 6 7 4 BEN-PAR1, 400-700 nm 60.000 201, 9.000E+01, 1.209E+03 ... 4 BEN-PAR1, 400-700 nm 60.000 1, 0.000E+00, 3.445E+01 1 = # of layers; 2 = name; 3 = PAR wavelength range; 4 = solar zenith angle; 5 = level number; 6 = altitude (km); PAR µmol m2 s-1. The PAR depth profile files display how the PAR decreases as it descends through the snow and sea ice layers. The snow surface is at level 138, and the sea ice surface is at level 118. The relative PAR data (e.g., Spr_0.2RP.dat) display the relative PAR value from the base of the ice relative to the snow surface (level 1/level 138) for the different sea ice and snow thicknesses. The number refers to the column-integrated concentration mg chl-a m2. Fig2_DATA: Wint/Spr/Sum refer to the seasonal scenario, and 0.2-500 refers to column-integrated concentration mg chl-a m2. Fig3_DATA: Wint/Spr/Sum refer to the seasonal scenario, and _0 and _20 folder names refer to the column-integrated concentration mg chl-a m2. The individual files (e.g., 50_20_ice) refer to the ice thickness cm_snow thickness cm_ fixedice or snow thickness). All data used in Fig. 3 and the variance analysis from Section 3.1 is presented in SnowIceVariance.xlsx Fig4_DATA: 0-8cm refer to the thickness of the basal algae layer. 2cm_2cm and 2cm_4cm refer to the basal+middle algae layers. FigS1 and FigS2: additional supplementary figures, similar to Fig2_DATA, of algal concentration (0-10 mg) and bare sea ice under clear-sky and cloudy conditions.

本稿件已于2024年5月28日被录用待刊，此为更新版本。本研究使用的数据由BHRR与MDK提供。
针对光合有效辐射（Photosynthetically Active Radiation，PAR）廓线数据（例如Sum_150.dat），其数值代表柱积分叶绿素a浓度，单位为mg chl-a·m⁻²。
文件内的列字段如下例所示：1 2 3 4 5 6 7 4 BEN-PAR1, 400-700 nm 60.000 201, 9.000E+01, 1.209E+03 ... 4 BEN-PAR1, 400-700 nm 60.000 1, 0.000E+00, 3.445E+01。其中：1为层数；2为数据名称；3为PAR波段范围；4为太阳天顶角；5为层级编号；6为海拔高度（单位：千米）；末列为PAR通量，单位为μmol·m⁻²·s⁻¹。
PAR深度廓线文件展示了PAR在穿过积雪与海冰层时的衰减规律。其中积雪表面对应层级138，海冰表面对应层级118。
相对PAR数据（例如Spr_0.2RP.dat）展示了不同积雪与海冰厚度下，冰底相对于积雪表面（层级1/层级138）的PAR相对值。其数值代表柱积分叶绿素a浓度，单位为mg chl-a·m⁻²。
图2数据集（Fig2_DATA）：Wint（冬季）、Spr（春季）、Sum（夏季）分别代表季节情景，0.2-500代表柱积分叶绿素a浓度，单位为mg chl-a·m⁻²。
图3数据集（Fig3_DATA）：Wint、Spr、Sum代表季节情景，文件夹名_0与_20代表柱积分叶绿素a浓度，单位为mg chl-a·m⁻²。单个文件（例如50_20_ice）的命名规则为：海冰厚度(cm)_积雪厚度(cm)_固定冰或积雪厚度。
图3所用全部数据及第3.1节的方差分析结果均收录于SnowIceVariance.xlsx文件中。
图4数据集（Fig4_DATA）：0-8cm代表底栖藻类层厚度；2cm_2cm与2cm_4cm代表底栖+中层藻类层厚度。
补充图S1与S2：为与Fig2_DATA类似的补充图表，展示了晴空与阴天条件下的藻类浓度（0-10 mg）及裸露海冰的相关数据。