Carns, R. C., B. Light, and S. G. Warren (2016), The spectral albedo of sea ice and salt crusts on the tropical ocean of Snowball Earth: II. Optical modeling, J. Geophys. Res. Oceans, 121, 5217–5230, doi:10.1002/2016JC011804.

Figure 4. Sensitivity of the method to different assumptions about grain size and crust thickness. Assuming large grains (12 lm) and 2 mm crust gives the lower bound on mim,; assuming small grains (7 lm) and semi-infinite crust (10 m) gives an upper bound. Shown are (a) the variation in inferred values of mim based on different grain size assumptions and (b) the variation in albedo output by the model using identical conditions (semi-infinite crust and 7 lm hydrohalite spheres) but varying the mim values by the same amount shown in Fig- ure 4a. The imaginary refractive index at wavelengths shorter than 900 nm is represented by a dashed line due to the larger uncertainty in this region. The true value is likely much lower.
Grain

Wavelength,Imaginary refractive index,,
nm,,,
530,0.97492,0.96312,0.9448
540,0.97507,0.96078,0.9454
550,0.97323,0.96154,0.94344
560,0.97307,0.95752,0.94341
570,0.9714,0.95586,0.93994
580,0.97248,0.95658,0.93959
590,0.97071,0.95477,0.93956
600,0.96861,0.95178,0.93273
610,0.96953,0.95262,0.93405
620,0.97056,0.95058,0.92849
630,0.96605,0.94944,0.92915
640,0.96643,0.94966,0.92938
650,0.96725,0.94783,0.93645
660,0.9664,0.94761,0.92471
670,0.96636,0.9477,0.92518
680,0.96756,0.94886,0.93152
690,0.96723,0.94852,0.92624
700,0.96547,0.9492,0.92706
710,0.96799,0.94916,0.93226
720,0.96538,0.94579,0.92739
730,0.96617,0.94652,0.92859
740,0.96639,0.94672,0.92868
750,0.96571,0.94988,0.92881
760,0.96651,0.94738,0.92489
770,0.96611,0.9473,0.92495
780,0.96654,0.94804,0.93016
790,0.96742,0.9489,0.93134
800,0.96916,0.94839,0.94143
810,0.96948,0.9525,0.94216
820,0.96853,0.9514,0.93083
830,0.9707,0.95533,0.9328
840,0.97065,0.95347,0.93324
850,0.96836,0.95367,0.93335
860,0.96826,0.95014,0.93819
870,0.96969,0.94989,0.92884
880,0.96875,0.95432,0.93444
890,0.96896,0.95435,0.93454
900,0.96936,0.95152,0.93488
910,0.97023,0.95213,0.93591
920,0.96931,0.95521,0.93563
930,0.96979,0.95547,0.93629
940,0.96995,0.95582,0.93645
950,0.96777,0.95211,0.92903
960,0.96441,0.94667,0.92562
970,0.95992,0.93746,0.91011
980,0.95685,0.93371,0.9025
990,0.95379,0.93003,0.90292
1000,0.95508,0.93266,0.90237
1010,0.9567,0.9338,0.91099
1020,0.96108,0.93918,0.91256
1030,0.96274,0.93883,0.91807
1040,0.95977,0.94257,0.91795
1050,0.96349,0.9441,0.92829
1060,0.9659,0.9491,0.91967
1070,0.96752,0.94942,0.92954
1080,0.96948,0.94956,0.92973
1090,0.96947,0.94966,0.93317
1100,0.96983,0.94986,0.93009
1110,0.96729,0.94962,0.9299
1120,0.9668,0.95034,0.93068
1130,0.96559,0.94925,0.9206
1140,0.96168,0.94242,0.91695
1150,0.95478,0.93018,0.90391
1160,0.94549,0.91647,0.88838
1170,0.94293,0.91002,0.87261
1180,0.93689,0.90429,0.86897
1190,0.93572,0.90203,0.87062
1200,0.93621,0.90234,0.85727
1210,0.93247,0.89626,0.85761
1220,0.9359,0.89641,0.85775
1230,0.93681,0.90348,0.85889
1240,0.94366,0.9116,0.8752
1250,0.95271,0.92533,0.89834
1260,0.9593,0.93498,0.9054
1270,0.96128,0.9377,0.9206
1280,0.96303,0.94075,0.91335
1290,0.96444,0.94466,0.92057
1300,0.96377,0.94521,0.92107
1310,0.96157,0.94163,0.91457
1320,0.96001,0.93885,0.91055
1330,0.95343,0.92663,0.89505
1340,0.94587,0.91486,0.87947
1350,0.93578,0.90103,0.86389
1360,0.92302,0.88079,0.84251
1370,0.91528,0.86524,0.81624
1380,0.91232,0.86593,0.81672
1390,0.9027,0.85428,0.79453
1400,0.8821,0.8259,0.76454
1410,0.85604,0.78328,0.69809
1420,0.81857,0.71829,0.619
1430,0.76663,0.64567,0.54195
1440,0.73281,0.62108,0.50001
1450,0.73357,0.5994,0.50109
1460,0.75805,0.64843,0.54514
1470,0.78707,0.68559,0.58131
1480,0.82208,0.72313,0.62494
1490,0.83091,0.75045,0.68075
1500,0.84928,0.76109,0.68168
1510,0.8494,0.77181,0.68218
1520,0.85016,0.77262,0.70692
1530,0.87065,0.80213,0.73875
1540,0.89769,0.84069,0.79033
1550,0.92047,0.87253,0.83383
1560,0.932,0.90237,0.8723
1570,0.94666,0.91746,0.88583
1580,0.95181,0.92697,0.89997
1590,0.96101,0.94349,0.91397
1600,0.9679,0.95131,0.92932
1610,0.969,0.95341,0.93236
1620,0.97405,0.95868,0.93448
1630,0.97144,0.96055,0.93944
1640,0.97499,0.9628,0.94199
1650,0.97775,0.96529,0.95386
1660,0.98163,0.98086,0.95855
1670,0.9852,0.9767,0.97822
1680,0.98822,0.98117,0.97205
1690,0.9904,0.98373,0.97672
1700,0.98487,0.97591,0.96705
1710,0.97812,0.96567,0.95105
1720,0.96862,0.95092,0.92974
1730,0.95442,0.93001,0.89907
1740,0.93609,0.90084,0.85924
1750,0.90733,0.8588,0.80178
1760,0.87919,0.81413,0.75351
1770,0.85963,0.7864,0.70749
1780,0.83626,0.75485,0.67414
1790,0.83621,0.74356,0.65055
1800,0.81525,0.73598,0.65108
1810,0.8363,0.74408,0.65168
1820,0.84516,0.77002,0.67679
1830,0.86104,0.77915,0.70486
1840,0.88213,0.81806,0.74635
1850,0.90328,0.85433,0.79075
1860,0.91079,0.86326,0.80729
1870,0.90191,0.84519,0.78051
1880,0.8814,0.81841,0.74777
1890,0.847,0.7602,0.6809
1900,0.78231,0.68134,0.58454
1910,0.71586,0.58552,0.45672
1920,0.61916,0.47376,0.35244
1930,0.54609,0.38742,0.23486
1940,0.52348,0.3541,0.21664
1950,0.54761,0.38911,0.23642
1960,0.54821,0.38992,0.25922
1970,0.52577,0.36573,0.23787
1980,0.49657,0.31846,0.20342
1990,0.52759,0.35857,0.22067
2000,0.62456,0.46399,0.32003
2010,0.72098,0.59265,0.46495
2020,0.7878,0.68886,0.59345
2030,0.84401,0.75529,0.68917
2040,0.86717,0.79777,0.72249
2050,0.87699,0.79824,0.723
2060,0.8874,0.82593,0.74976
2070,0.87701,0.81438,0.73965
2080,0.87624,0.81395,0.73981
2090,0.8875,0.82666,0.7817
2100,0.88829,0.82739,0.77012
2110,0.86895,0.80015,0.72563
2120,0.85346,0.78243,0.69373
2130,0.82887,0.7533,0.67181
2140,0.81631,0.72113,0.63288
2150,0.79128,0.69465,0.60102
2160,0.77256,0.67305,0.56202
2170,0.77238,0.65299,0.5626
2180,0.76091,0.65317,0.54026
2190,0.78542,0.67431,0.56358
2200,0.84895,0.75529,0.67468
2210,0.78544,0.67508,0.56478
2220,0.78494,0.6752,0.56517
,0.77476,0.67609,0.56581
,0.77466,0.67645,0.56629
,0.77508,0.67677,0.5667
,0.7749,0.67721,0.56732