Katabatic wind in the context of "McMurdo Dry Valleys"

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⭐ Core Definition: Katabatic wind

A katabatic wind (named from Ancient Greek κατάβασις (katábasis) 'descent') is a downslope wind caused by the flow of an elevated, high-density air mass into a lower-density air mass below the force of gravity. The spelling catabatic is also used. Since air density is strongly dependent on temperature, the high-density air mass is usually cooler, and the katabatic winds are relatively cool or cold.

Examples of katabatic winds include the downslope valley and mountain breezes, the piteraq winds of Greenland, the Bora in the Adriatic, the Bohemian Wind or Böhmwind in the Ore Mountains, the Santa Ana winds in southern California, the oroshi in Japan, or "the Barber" in New Zealand.

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👉 Katabatic wind in the context of McMurdo Dry Valleys

77°28′S 162°31′E / 77.467°S 162.517°E / -77.467; 162.517

The McMurdo Dry Valleys are a series of largely snow-free desert valleys on the continental coastline of Victoria Land, Antarctica, east of the East Antarctic Ice Sheet and west of McMurdo Sound and the Ross Sea. The Dry Valleys are notable for being the coldest and driest desert in the world, as well as being the largest ice-free region in Antarctica; as a result, the Valleys have become a notable hotbed for scientific research in the Antarctic region. The Dry Valleys' unique climate is due to their location nestled within the Transantarctic Mountains along with high-pressure katabatic winds that scour away snowfall and humidity across the region. Surrounding mountains prevent the flow of ice from nearby glaciers. The region's geology is primarily granites and gneisses, and glacial tills dot the bedrock landscape, with loose gravel covering the ground. The Valleys are one of the driest places on Earth, though there are several anecdotal accounts of rainfall within the Dry Valleys.

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Katabatic wind in the context of Climate of Antarctica

The climate of Antarctica is the coldest on Earth. The continent is also extremely dry (it is a desert), averaging 166 mm (6.5 in) of precipitation per year. Snow rarely melts on most parts of the continent, and, after being compressed, becomes the glacier ice that makes up the ice sheet. Weather fronts rarely penetrate far into the continent, because of the katabatic winds. Most of Antarctica has an ice-cap climate (Köppen classification EF) with extremely cold and dry weather.

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Katabatic wind in the context of Bora (wind)

The bora is a northerly to north-easterly katabatic wind in areas near the Adriatic Sea. Similar nomenclature is used for north-eastern winds in other littoral areas of eastern Mediterranean and Black Sea basins.

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Katabatic wind in the context of Martian polar ice caps

The planet Mars has two permanent polar ice caps of water ice and some dry ice (frozen carbon dioxide, CO2). Above kilometer-thick layers of water ice permafrost, slabs of dry ice are deposited during a pole's winter, lying in continuous darkness, causing 25–30% of the atmosphere being deposited annually at either of the poles. When the poles are again exposed to sunlight, the frozen CO2 sublimes. These seasonal actions transport large amounts of dust and water vapor, giving rise to Earth-like frost and large cirrus clouds.

The caps at both poles consist primarily of water ice. Frozen carbon dioxide accumulates as a comparatively thin layer about one meter thick on the north cap in the northern winter, while the south cap has a permanent dry ice cover about 8 m thick. The northern polar cap has a diameter of about 1000 km during the northern Mars summer, and contains about 1.6 million cubic km of ice, which if spread evenly on the cap would be 2 km thick. (This compares to a volume of 2.85 million cubic km (km) for the Greenland ice sheet.) The southern polar cap has a diameter of 350 km and a thickness of 3 km. The total volume of ice in the south polar cap plus the adjacent layered deposits has also been estimated at 1.6 million cubic km. Both polar caps show spiral troughs, which analysis of SHARAD ice penetrating radar has shown are a result of roughly perpendicular katabatic winds that spiral due to the Coriolis Effect.

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Katabatic wind in the context of Mountain breeze and valley breeze

In meteorology, a mountain breeze and a valley breeze are two related, localized winds that occur one after the other on a daily cycle. They are an example of anabatic and katabatic winds occurring at local scales. These winds are opposite from each other. Mountain winds blow from the mountains towards valleys after sunset, when mountains cool down and the valley zone is comparatively warmer. While valley breezes occur when the warm air rises up the sides of the valley, warm air in a mountain breeze will rise up the middle.

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Katabatic wind in the context of Foehn wind

A Foehn, or Föhn (German pronunciation: [føːn], UK: /fɜːn/, US: /fn/ fayn, US also /fʌn, fɜːrn/ fu(r)n), is a type of dry, relatively warm downslope wind in the lee of a mountain range. It is a rain shadow wind that results from the subsequent adiabatic warming of air that has dropped most of its moisture on windward slopes (see orographic lift). As a consequence of the different adiabatic lapse rates of moist and dry air, the air on the leeward slopes becomes warmer than equivalent elevations on the windward slopes.

Foehn winds can raise temperatures by as much as 14 °C (25 °F) in just a matter of hours. Switzerland, southern Germany, and Austria have a warmer climate due to the Foehn, as moist winds off the Mediterranean Sea blow over the Alps.

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Katabatic wind in the context of Piteraq

A piteraq is a cold katabatic wind which originates on the Greenlandic icecap and sweeps down the east coast. The word "piteraq" means "that which attacks you" in the local language. Piteraqs are most common in the autumn and winter. Wind speeds typically reach 50 to 80 m/s (180–288 km/h; 111–178 mph).

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Katabatic wind in the context of Bohemian Wind

The Bohemian wind or böhm (German: Böhmwind or Böhmischer Wind) is a katabatic downslope wind, which occurs in East Bavaria, eastern Upper Franconia, the Vogtland, the Ore Mountains, Upper Lusatia, the Sudetes and the Austrian Granite and Gneiss Highland. It is associated with gusty, dry winds and low temperatures. The böhm carries hazy, often slightly dusty air from the Bohemian Basin.

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