A sea of clouds is an overcast layer of stratocumulus clouds, as viewed from above, with a relatively uniform top which shows undulations of very different lengths resembling waves on the sea. A sea of fog is formed from stratus clouds or fog and does not show undulations.
In both cases, the phenomenon looks very similar to the open ocean. The comparison is even more complete if some mountain peaks rise above the clouds, thus resembling islands.
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In meteorology, an inversion (or temperature inversion) is a phenomenon in which a layer of warmer air overlies cooler air. Normally, air temperature gradually decreases as altitude increases, but this relationship is reversed in an inversion.
An inversion traps air pollution, such as smog, near the ground. An inversion can also suppress convection by acting as a "cap". If this cap is broken for any of several reasons, convection of any humidity can then erupt into violent thunderstorms. Temperature inversion can cause freezing rain in cold climates.
Wanderer above the Sea of Fog is a painting by German Romanticist artist Caspar David Friedrich in 1818. It depicts a man standing upon a rocky precipice with his back to the viewer; he is gazing out on a landscape covered in a thick sea of fog through which other ridges, trees, and mountains pierce, which stretches out into the distance indefinitely.
It is considered to be one of the masterpieces of the Romantic movement and one of its most representative works. The painting has been interpreted as an emblem of self-reflection or contemplation of life's path, and the landscape is considered to evoke the sublime. Friedrich was a common user of Rückenfigur (German: Rear-facing figure) in his paintings; Wanderer above the Sea of Fog is perhaps the most famous Rückenfigur in art due to the subject's prominence. The painting has also been interpreted as an expression of Friedrich's German liberal and nationalist feeling.
A stratocumulus cloud [Kämtz 1840], occasionally called a cumulostratus, belongs to a genus-type of clouds characterized by large dark, rounded masses, usually in groups, lines, or waves, the individual elements being larger than those in altocumulus, and the whole being at a lower height, usually below 2,000 metres (6,600 ft). Weak convective currents create shallow cloud layers (see also: sea of clouds) because of drier, stable air above preventing continued vertical development. Historically, in English, this type of cloud has been referred to as a twain cloud for being a combination of two types of clouds.
Mount Lu or Lushan (simplified Chinese: 庐山; traditional Chinese: 廬山; pinyin: Lúshān, Gan: Lu-san) is a mountain situated in Jiujiang, China. It was also known as Kuanglu (匡廬) in ancient times. The mountain and its immediate area are officially designated as the Lushan National Park, and it is one of the most renowned mountains in the country. Mount Lu is located primarily in Lushan City within Jiujiang, although its northern portions are found in Jiujiang's Lianxi District. The oval-shaped mountains are about 25 kilometers (16 mi) long and 10 kilometers (6.2 mi) wide, and neighbors Jiujiang and the Yangtze River to the north, Nanchang to the south, and Poyang Lake to the east. Its highest point is Dahanyang Peak (大汉阳峰), reaching 1,474 meters (4,836 ft) above sea level. Dahayang Peak is also one of the hundreds of steep peaks that tower above the so-called sea of clouds that can encompass the mountain for almost 200 days each year.
Mount Lu is known for its grandeur, steepness, and beauty and is a prominent tourist attraction, especially during the summer months when the weather is cooler in the mountains than elsewhere. The mountain and the surrounding region is also one of the "spiritual centers" of China, containing many Buddhist and Daoist temples in addition to landmarks of Confucianism. Due to its striking beauty and sacred importance, Lushan National Park has been a UNESCO World Heritage Site since 1996. The overlapping Lushan Quaternary Glaciation National Geopark is a member of the UNESCO Global Geoparks Network.