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

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