What kind of picture does the first four sentences of Du Fu's poem Ascending the Mountain depict?

The first four sentences of the poem describe the magnificent bleak autumn scenery: the sudden strong wind shakes the sky and makes a whistling sound; Apes wail, Zhu innocent, birds reflect cold Zhu, leaves fall, rivers run, and the color of late autumn is sad. These two couplets, although not explicitly ascending, are actually ascending to see the scenery.