How to calculate blue sky albedo with MODIS & Google Earth Engine?

I am trying to calculate the blue sky albedo (I think this is the same as land surface albedo – correct me if I’m wrong) using Google Earth Engine and the ‘MCD43A3.006 MODIS Albedo Daily 500m’ data.

I’ve managed to find various formulas, user guides and papers (example 1, example 2) describing this. However, maybe I’m a bit too new to GIS to understand these and how to implement them.

How would one go about estimating the blue sky albedo from the various black sky and white sky albedo bands present in the MODIS dataset?

Maybe something similar to what is produced on the Remote Sensing Lab albedo tool.

Any practical advice would be appreciated. My code is here:

var albedo: "ImageCollection MCD43A3.006 MODIS Albedo Daily 500m" // this is in the 'imports' section.  

var albedo_filtered = albedo
                      .filterDate('2019-01-01', '2019-01-31');

var blackSkyAlbedo = albedo_filtered.select('Albedo_BSA_Band1');

var alb_val_range = {
  min: 0.0,
  max: 600.0,
};
var albedo_median = blackSkyAlbedo.median();

Map.addLayer(albedo_filtered, alb_val_range,'all layers', 1, 0.5);
Map.addLayer(albedo_median, alb_val_range, 'Median Black-Sky Albedo', 1, 0.5);

// Map.addLayer(blackSkyAlbedo, alb_val_range, 'Black-Sky Albedo', 1, 0.5);