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Tundra Ecoregions
In physical geography, tundra () is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. The term ''tundra'' comes through Russian (') from the Kildin Sámi word (') meaning "uplands", "treeless mountain tract". There are three regions and associated types of tundra: Arctic tundra, alpine tundra, and Antarctic tundra. Tundra vegetation is composed of dwarf shrubs, sedges, grasses, mosses, and lichens. Scattered trees grow in some tundra regions. The ecotone (or ecological boundary region) between the tundra and the forest is known as the tree line or timberline. The tundra soil is rich in nitrogen and phosphorus. The soil also contains large amounts of biomass and decomposed biomass that has been stored as methane and carbon dioxide in the permafrost, making the tundra soil a carbon sink. As global warming heats the ecosystem and causes soil thawing, the permafrost carbon cycle accelerates and releases much of these soil-contained gre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polar Climate
The polar climate regions are characterized by a lack of warm summers but with varying winters. Every month in a polar climate has an average temperature of less than . Regions with polar climate cover more than 20% of the Earth's area. Most of these regions are far from the equator and near the poles, and in this case, winter days are extremely short and summer days are extremely long (could last for the entirety of each season or longer). A polar climate consists of cool summers and very cold winters, which results in treeless tundra, glaciers, or a permanent or semi-permanent layer of ice. It is identified with the letter E in the Köppen climate classification. Subtypes There are two types of polar climate: ET, or tundra climate; and EF, or ice cap climate. A tundra climate is characterized by having at least one month whose average temperature is above , while an ice cap climate has no months averaging above . In a tundra climate, even coniferous trees cannot grow, but o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphorus
Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about 0.06 grams). In minerals, phosphorus generally occurs as phosphate. Elemental phosphorus was first isolated as white phosphorus in 1669. White phosphorus emits a faint glow when exposed to oxygen – hence the name, taken from Greek mythology, meaning 'light-bearer' (Latin ), referring to the " Morning Star", the planet Venus. The term '' phosphorescence'', meaning glow after illumination, derives from this property of phosphorus, although the word has since been used for a different physical process that produces a glow. The glow of phosphorus is caused by oxidation of the white (but not red) phosphorus — a process now called chem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic Vegetation
About 1,702 species of plants live on the Arctic tundra, including flowering plants, short shrubs, herbs, grasses, mosses. These plants are adapted to short, cold growing seasons. They have the ability to withstand extremely cold temperatures in the winter (winter hardiness), and grow and reproduce in summer conditions that are quite limiting. As of 2005, arctic vegetation covered approximately of land. The area of arctic vegetation decreased by approximately from 1980 to 2000, with a corresponding increase in the boreal forest. This decrease is linked to the warming of the Arctic due to climate change. Adaptations Arctic plants have a number of adaptations to the compressed growing season and low temperatures: * They initiate growth rapidly in the spring, and flower and set seed much sooner than plants that grow in warmer conditions. * Their peak metabolic rate occurs at a much lower temperature than plants from farther south, but only peaks for a short growing season. * So ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tundra In Siberia
In physical geography, tundra () is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. The term ''tundra'' comes through Russian language, Russian (') from the Kildin Sámi language, Kildin Sámi word (') meaning "uplands", "treeless mountain tract". There are three regions and associated types of tundra: Arctic tundra, alpine tundra, and Antarctic tundra. Tundra vegetation is composed of dwarf shrubs, Cyperaceae, sedges, Poaceae, grasses, mosses, and lichens. Scattered trees grow in some tundra regions. The ecotone (or ecological boundary region) between the tundra and the forest is known as the tree line or timberline. The tundra soil is rich in nitrogen and phosphorus. The soil also contains large amounts of biomass and decomposed biomass that has been stored as methane and carbon dioxide in the permafrost, making the tundra soil a carbon sink. As global warming heats the ecosystem and causes soil thawing, the permafrost carbon c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sami People
Acronyms * SAMI, ''Synchronized Accessible Media Interchange'', a closed-captioning format developed by Microsoft * Saudi Arabian Military Industries, a government-owned defence company * South African Malaria Initiative, a virtual expertise network of malaria researchers People * Samee, also spelled Sami, a male given name * Sami (name), including lists of people with the given name or surname * Sámi people, indigenous people of the Scandinavian Peninsula, the Kola Peninsula, Karelia and Finland ** Sámi cuisine ** Sámi languages, of the Sami people ** Sámi shamanism, a faith of the Sami people Places * Sápmi, a cultural region in Northern Europe * Sami (ancient city), in Elis, Greece * Sami Bay, east of Sami, Cephalonia * Sami District, Gambia * Sami, Burkina Faso, a district of the Banwa Province * Sami, Cephalonia, a municipality in Greece * Sami, Gujarat, a town in Patan district of Gujarat, India * Sami, Paletwa, a town in Chin State, Myanmar * Sämi, a village in L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nenet People
The Nenets ( yrk, ненэй ненэче, ''nenəj nenəče'', russian: ненцы, ''nentsy''), also known as Samoyed, are a Samoyedic ethnic group native to northern Arctic Russia, Russian Far North. According to the latest census in 2010, there were 44,857 Nenets in the Russian Federation, most of them living in the Yamalo-Nenets Autonomous Okrug, Nenets Autonomous Okrug and Taymyrsky Dolgano-Nenetsky District stretching along the coastline of the Arctic Ocean near the Arctic Circle between Kola and Taymyr peninsulas. The Nenets people speak either the Tundra or Forest Nenets languages, which are mutually unintelligible. In the Russian Federation they have a status of indigenous small-numbered peoples. Today, the Nenets people face numerous challenges from the state and oil and gas companies that threaten the environment and their way of life. As a result, many cite a rise in locally based activism. Name The literal morphs ''samo'' and ''yed'' in Russian convey the meani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nganasan People
The Nganasans (; Nganasan: ''ŋənəhsa(nəh)'', ''ńæh'') are a Uralic people of the Samoyedic branch native to the Taymyr Peninsula in north Siberia. In the Russian Federation, they are recognized as one of the indigenous peoples of the Russian North. They reside primarily in the settlements of Ust-Avam, Volochanka, and Novaya in the Taymyrsky Dolgano-Nenetsky District of Krasnoyarsk Krai, with smaller populations residing in the towns of Dudinka and Norilsk as well. The Nganasans are thought to be the direct descendants of proto-Uralic peoples. However there is some evidence that they absorbed local Paleo-Siberian population. The Nganasans were traditionally a semi-nomadic people whose main form of subsistence was wild reindeer hunting, in contrast to the Nenets, who herded reindeer. Beginning in the early 17th century, the Nganasans were subjected to the yasak system of Czarist Russia. They lived relatively independently, until the 1970s, when they were settled in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sápmi (area)
(, smj, Sábme / Sámeednam, sma, Saepmie, sju, Sábmie, , , sjd, Са̄мь е̄ммьне, Saam' jiemm'n'e) is the cultural region traditionally inhabited by the Sámi people. Sápmi is in Northern and Eastern Europe and includes the northern parts of Fennoscandia, also known as the "Cap of the North". The region stretches over four countries: Norway, Sweden, Finland, and Russia. On the north it is bounded by the Barents Sea, on the west by the Norwegian Sea, and on the east by the White Sea."Lapland." Encyclopædia Britannica. ''Encyclopædia Britannica Online. Encyclopædia Britannica'', 2009. Web. 24 November 2009 http://search.eb.com/eb/article-9047170. The area is historically referred to as Lapland () in English, although the term "Lapp" for its inhabitants is now considered pejorative.; ; Norwegian Sápmi was historically called ''Finnmǫrk'', a name used for the former county Finnmark, now Troms og Finnmark. Sápmi refers to the areas where the Sámi people h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taiga
Taiga (; rus, тайга́, p=tɐjˈɡa; relates to Mongolic and Turkic languages), generally referred to in North America as a boreal forest or snow forest, is a biome characterized by coniferous forests consisting mostly of pines, spruces, and larches. The taiga or boreal forest has been called the world's largest land biome. In North America, it covers most of inland Canada, Alaska, and parts of the northern contiguous United States. In Eurasia, it covers most of Sweden, Finland, much of Russia from Karelia in the west to the Pacific Ocean (including much of Siberia), much of Norway and Estonia, some of the Scottish Highlands, some lowland/coastal areas of Iceland, and areas of northern Kazakhstan, northern Mongolia, and northern Japan (on the island of Hokkaidō). The main tree species, depending on the length of the growing season and summer temperatures, vary across the world. The taiga of North America is mostly spruce, Scandinavian and Finnish taiga consists of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Hemisphere
The Northern Hemisphere is the half of Earth that is north of the Equator. For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's North Pole. Owing to Earth's axial tilt of 23.439281°, winter in the Northern Hemisphere lasts from the December solstice (typically December 21 UTC) to the March equinox (typically March 20 UTC), while summer lasts from the June solstice through to the September equinox (typically on 23 September UTC). The dates vary each year due to the difference between the calendar year and the astronomical year. Within the Northern Hemisphere, oceanic currents can change the weather patterns that affect many factors within the north coast. Such events include El Niño–Southern Oscillation. Trade winds blow from east to west just above the equator. The winds pull surface water with them, creating currents, which flow westward due to the Coriolis e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reindeer
Reindeer (in North American English, known as caribou if wild and ''reindeer'' if domesticated) are deer in the genus ''Rangifer''. For the last few decades, reindeer were assigned to one species, ''Rangifer tarandus'', with about 10 subspecies. A 2022 revision of the genus elevated five of the subspecies to species (see Taxonomy below). They have a circumpolar distribution and are native to the Arctic, sub-Arctic, tundra, boreal forest, and mountainous regions of northern Europe, Siberia, and North America. Reindeer occur in both migratory and sedentary populations, and their herd sizes vary greatly in different regions. The tundra subspecies are adapted for extreme cold, and some are adapted for long-distance migration. Reindeer vary greatly in size and color from the smallest species, the Svalbard reindeer (''R. t. platyrhynchus''), to the largest subspecies, Osborn's caribou (''R. t. osborni''). Although reindeer are quite numerous, some species and subspecies are in d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Climate Change Feedback
Climate change feedbacks are important in the understanding of global warming because feedback processes amplify or diminish the effect of each climate forcing, and so play an important part in determining the climate sensitivity and future climate state. Feedback in general is the process in which changing one quantity changes a second quantity, and the change in the second quantity in turn changes the first. Positive (or reinforcing) feedback amplifies the change in the first quantity while negative (or balancing) feedback reduces it. The term "forcing" means a change which may "push" the climate system in the direction of warming or cooling. An example of a climate forcing is increased atmospheric concentrations of greenhouse gases. By definition, forcings are external to the climate system while feedbacks are internal; in essence, feedbacks represent the internal processes of the system. Some feedbacks may act in relative isolation to the rest of the climate system; others ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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