An offshore wind power plant in Rongcheng, Shandong province is shrouded in advection fog on Jan 25. Advection fog is produced when damp air moves across a surface that is cooler than the air. [Photo/IC]

Fog surrounds an offshore wind power plant in Rongcheng, Shandong province on Jan 25. [Photo/IC]

An aerial photo taken on Jan 25 shows fog covering an offshore wind power plant in Rongcheng, Shandong province. [Photo/IC]

An offshore wind power plant in Rongcheng, Shandong province is engulfed by heavy advection fog on Jan 25. [Photo/IC]

An offshore wind power plant in Rongcheng, Shandong province is covered in a thick layer of advection fog on Jan 25. [Photo/IC]

An offshore wind power plant in Rongcheng, Shandong province is enveloped in fog. [Photo/IC]