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The conversion of sulfur dioxide to sulfuric acid, which condenses rapidly in the stratosphere to form fine sulfate aerosols. A volcanic winter is a reduction in global temperatures caused by droplets of sulfuric acid obscuring the Sun and raising Earth's albedo (increasing the reflection of solar radiation) after a large, sulfur-rich, particularly explosive volcanic eruption.
Hard rime on trees in the Black Forest of Germany. Hard rime is a white ice that forms when the water droplets in fog freeze to the outer surfaces of objects. It is often seen on trees atop mountains and ridges in winter, when low-hanging clouds cause freezing fog.
Józef Chełmoński: Partridges in the snow, 1891 Richard von Drasche-Wartinberg: In Deep Winter. The depiction of winter landscapes in Western art begins in the 15th century, as does landscape painting in general. Wintry and snowy landscapes are very rarely seen in earlier European painting since most of the subjects were religious.
In the history of artificial intelligence, an AI winter is a period of reduced funding and interest in artificial intelligence research. [1] The field has experienced several hype cycles , followed by disappointment and criticism, followed by funding cuts, followed by renewed interest years or even decades later.
The Köppen climate classification is the most widely used climate classification system. [2] It defines a tropical climate as a region where the mean temperature of the coldest month is greater than or equal to 18 °C (64 °F) and does not fit into the criteria for B-group climates, classifying them as an A-group (tropical climate group). [3]
At least three times as much precipitation in the wettest month of winter as in the driest month of summer, and the driest month of summer receives less than 30 mm (1.2 in). Dsd = Mediterranean-influenced extremely cold subarctic climate; coldest month averaging below −38 °C (−36.4 °F) and one–three months averaging above 10 °C (50 °F).
A snow globe with a figurine of Santa Claus Video of a snow globe. Motive: Vienna. A snow globe (also called a waterglobe, snowstorm, [1] or snowdome) is a transparent sphere, traditionally made of glass, enclosing a miniaturized scene of some sort, often together with a model of a town, neighborhood, landscape or figure.
In the United States an extreme cold warning was an experimental weather warning issued by the National Weather Service in North Dakota, South Dakota, and Minnesota. [5] The warning was issued if the temperature fell to −35 °F (−37 °C) or colder with a wind of less than 5 mph (8 km/h; 2 m/s). [6]