Table VI. Incoming short-wave radiation, 10-day means (cal/cm' day). 



• TOP OF VEGETATION 



** PERCENT OF INCIDENT AT TOP OF VEGETATION 



The reflectivities of typical man-disturbed and undisturbed surfaces within the Barrow ecosys- 

 tem are shown in Table Vn. The reflectivities of natural dry-ground vegetation (24% reflectivity) 

 and wet-ground vegetation (16%) are reduced to as low as 10% by various kinds of surface manipula- 

 tions. 



Table VII. Albedo measurements over undisturbed and disturbed 

 tundra surfaces, Barrow, Alaska. 



Dry ground 



Albedo 



(V 



1. Dead grass, tall 



2. Top of high polygons, low vegetation 



3. Low vegetation (brownish, willow leaves) 



4. Cotton grass 



Wet ground 



5. Green grass and moss, low 



6. Green vegetation, high 



7. Dead vegetation 



8. Bottom of high polygons, wet moss 



Bare natural ground 



26 

 24 

 23 

 23 



20 

 16 

 15 



11 



9. Mud flats of wet creek bed 

 Vfater surfaces 



10. Cat track, water-filled 



11. Weasel track, water-filled 



12. Water puddle in Ski-doo track 



15 



11 

 10 

 10 



20 



