why do you think the protagonist is referred to as the man as opposed to being given a name?

"DAY HAD BROKEN cold and gray, exceedingly cold and gray, when the man turned aside from the main Yukon trail and climbed the high earth-bank, where a dim and little-travelled trail led eastward through the fat spruce timberland. It was a steep bank, and he paused for breath at the top, excusing the act to himself by looking at his watch. It was nine o'clock. There was no sun nor hint of sun, though there was not a cloud in the sky. It was a clear day, and yet there seemed an intangible pall over the face of things, a subtle gloom that made the day dark, and that was due to the absence of sun. This fact did not worry the man. He was used to the lack of sun. It had been days since he had seen the sun, and he knew that a few more days must pass before that cheerful orb, due south, would just peep above the sky-line and dip immediately from view."

It was a cold dark morning; no sunshine, not even rays breaking through the clouds. The clouds were like a blanket or an awning. You know how it is when you walk outside and it's 10 degrees but the sun is shining, and then later, after the sun disappears it feels so much colder; that's how it is.