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PTAA GMB Model
PTAAGMB (Precipitation-Temperature-Area-Altitude Glacier Mass Balance) Overview The PTAAGMB Model is used for calculating a glacier's mass balance, the primary indicator of its health, and plots the changes to its mass balance over time to predict its future. Developed in the mid-1990s by glaciologist Wendell Tangborn, the PTAAGMB model provides an easy and reliable alternative to the challenging task of manually measuring glaciers using snow pits and ablation stakes. The PTAAGMB model only requires data from the precipitation and temperature (PT) observations from nearby low-altitude weather stations and the glacier's area-altitude (AA) distribution. Glacier Mass Balance and Climate Change Glaciers are ultra-sensitive to minute changes in the climate and respond by changing their size and by advancing or retreating. The mass balance, or the difference between snow accumulation and snow and ice ablation, is crucial to glacier health and its survival. The Columbia Glacier in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacier Mass Balance
Crucial to the survival of a glacier is its mass balance or surface mass balance (SMB), the difference between accumulation and ablation (sublimation and melting). Climate change may cause variations in both temperature and snowfall, causing changes in the surface mass balance. Changes in mass balance control a glacier's long-term behavior and are the most sensitive climate indicators on a glacier. From 1980 to 2012 the mean cumulative mass loss of glaciers reporting mass balance to the World Glacier Monitoring Service is −16 m. This includes 23 consecutive years of negative mass balances. A glacier with a sustained negative balance is out of equilibrium and will retreat, while one with a sustained positive balance is out of equilibrium and will advance. Glacier retreat results in the loss of the low elevation region of the glacier. Since higher elevations are cooler than lower ones, the disappearance of the lowest portion of the glacier reduces overall ablation, thereby incr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Langtang Glacier
The Langtang Glacier is a short glacier in Nepal, located in Langtang in the Himalayan mountains The Himalayas, or Himalaya (; ; ), is a mountain range in Asia, separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the planet's highest peaks, including the very highest, Mount Everest. Over 100 ....The glacier has a length of 18 km and covers an area of 46.5 km². References Bagmati Province Glaciers of Nepal {{Nepal-glacier-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nepal
Nepal (; ne, नेपाल ), formerly the Federal Democratic Republic of Nepal ( ne, सङ्घीय लोकतान्त्रिक गणतन्त्र नेपाल ), is a landlocked country in South Asia. It is mainly situated in the Himalayas, but also includes parts of the Indo-Gangetic Plain, bordering the Tibet Autonomous Region of China to the north, and India in the south, east, and west, while it is narrowly separated from Bangladesh by the Siliguri Corridor, and from Bhutan by the Indian state of Sikkim. Nepal has a diverse geography, including fertile plains, subalpine forested hills, and eight of the world's ten tallest mountains, including Mount Everest, the highest point on Earth. Nepal is a multi-ethnic, multi-lingual, multi-religious and multi-cultural state, with Nepali as the official language. Kathmandu is the nation's capital and the largest city. The name "Nepal" is first recorded in texts from the Vedic period of the India ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Cascade Glacier
South Cascade Glacier is a large alpine glacier in the North Cascades of Washington, USA. It is bordered on the east by Sentinel Peak, and is about north of Glacier Peak in the Glacier Peak Wilderness. Meltwater from the glacier flows directly into South Cascade Lake, which feeds the South Fork Cascade River, which is a tributary of the Skagit River. South Cascade Glacier is one of the four "benchmark glaciers" that is monitored by the USGS and its mass balance has been monitored since 1959. Its area has declined from 2.71 km2 in 1958 to 1.8 km2 in 2015 representing an area loss of 34%. Between 1958 and 2009 South Cascade Glacier lost nearly a half of its volume. See also * Ptarmigan Traverse * Retreat of glaciers since 1850 * List of glaciers in the United States This is a list of glaciers existing in the United States, currently or in recent centuries. These glaciers are located in nine states, all in the Rocky Mountains or farther west. The southernmost named glacier a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bering Glacier
Bering Glacier is a glacier in the U.S. state of Alaska. It currently terminates in Vitus Lake south of Alaska's Wrangell-St. Elias National Park, about from the Gulf of Alaska. Combined with the Bagley Icefield, where the snow that feeds the glacier accumulates, the Bering is the largest glacier in North America. The glacier is named after Vitus Bering. Glacier retreat and earthquakes Warmer temperatures and changes in precipitation over the past century have thinned the Bering Glacier by several thousand meters. Since 1900 the terminus has retreated as much as . The Bering Glacier exhibits "surges", acceleration events of the flow rate of the glacier, every 20 years or so. During these periods the glacier terminus advances. The surges are generally followed by periods of retreat, so despite the periodic advances the glacier has been shrinking overall. Most glaciers along the Alaskan coast have been retreating along with the Bering Glacier.''Bering Glacier: Interdisciplinary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cordova, Alaska
Cordova ( ) is a city in Chugach Census Area, Alaska, United States. It lies near the mouth of the Copper River, at the head of Orca Inlet on the east side of Prince William Sound. The population was 2,609 at the 2020 census, up from 2,239 in 2010. Cordova was named ''Puerto Córdoba'' (after Córdoba, Spain) by Spanish explorer Salvador Fidalgo in 1790. No roads connect Cordova to other Alaskan communities, so a plane or ferry is required to travel there. In the Exxon Valdez oil spill of March 1989, an oil tanker ran aground northwest of Cordova, heavily damaging ecology and fishing. It was cleaned up shortly after, but there are lingering effects, such as a lowered population of some birds. History In 1790 the inlet in front of the current Cordova townsite was named Puerto Cordova by Spanish explorer Salvador Fidalgo, after Spanish admiral Luis de Córdova y Córdova. The city of Cordova was named after it, although the inlet itself was later renamed the Orca Inlet. Cord ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yakutat, Alaska
The City and Borough of Yakutat (, ; Tlingit: ''Yaakwdáat''; russian: Якутат) is a borough in the U.S. state of Alaska and the name of a former city within it. The name in Tlingit is ''Yaakwdáat'' (meaning "the place where canoes rest"). It derives from an Eyak name, ''diyaʼqudaʼt'', and was influenced by the Tlingit word ''yaakw'' ("canoe, boat"). The borough covers an area about six times the size of the U.S. state of Rhode Island, making it one of the largest counties (or county equivalents) in the United States. As of the 2020 census, the population was 662, same number as previous census. As of 2010, it was Alaska's least populous borough or census area, and the ninth-least populous county nationwide. The population had declined from 680 in 2000. The Borough of Yakutat was incorporated as a non-unified Home Rule Borough on September 22, 1992. Yakutat was previously a city in the Skagway–Yakutat–Angoon Census Area (afterwards renamed as the Skagw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glaciological
Glaciology (; ) is the scientific study of glaciers, or more generally ice and natural phenomena that involve ice. Glaciology is an interdisciplinary Earth science that integrates geophysics, geology, physical geography, geomorphology, climatology, meteorology, hydrology, biology, and ecology. The impact of glaciers on people includes the fields of human geography and anthropology. The discoveries of water ice on the Moon, Mars, Europa and Pluto add an extraterrestrial component to the field, which is referred to as "astroglaciology". Overview A glacier is an extended mass of ice formed from snow falling and accumulating over a long period of time; glaciers move very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of accumulation, as in continental glaciers. Areas of study within glaciology include glacial history and the reconstruction of past glaciation. A glaciologist is a person who studies glaciers. A glacial geologist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrological
Hydrology () is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and environmental watershed sustainability. A practitioner of hydrology is called a hydrologist. Hydrologists are scientists studying earth or environmental science, civil or environmental engineering, and physical geography. Using various analytical methods and scientific techniques, they collect and analyze data to help solve water related problems such as environmental preservation, natural disasters, and water management. Hydrology subdivides into surface water hydrology, groundwater hydrology (hydrogeology), and marine hydrology. Domains of hydrology include hydrometeorology, surface hydrology, hydrogeology, drainage-basin management, and water quality, where water plays the central role. Oceanography and meteorology are not included because water is only one of many important aspects within those fields. Hydr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greenland Ice Cap
The Greenland ice sheet ( da, Grønlands indlandsis, kl, Sermersuaq) is a vast body of ice covering , roughly near 80% of the surface of Greenland. It is sometimes referred to as an ice cap, or under the term ''inland ice'', or its Danish equivalent, ''indlandsis''. An acronym, GIS, is frequently used in the scientific literature. It is the second largest ice body in the world, after the Antarctic ice sheet. The ice sheet is almost long in a north–south direction, and its greatest width is at a latitude of 77°N, near its northern margin. The average thickness is about and over at its thickest point. In addition to the large ice sheet, smaller ice caps (such as Maniitsoq and Flade Isblink) as well as glaciers, cover between around the periphery. The Greenland ice sheet is adversely affected by climate change. It is more vulnerable to climate change than the Antarctic ice sheet because of its position in the Arctic, where it is subject to the regional amplification of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gulkana2 , a 60-mile (97 km) tributary of the Copper River in the U.S. state of Alaska
{{disambiguation ...
Gulkana can mean the following, * Gulkana, Alaska, a census-designated place (CDP) in Valdez-Cordova Census Area, Alaska, U.S. * Gulkana Glacier , glacier that flows from the ice fields of the south flank of the eastern Alaska Range * Gulkana River The Gulkana River is a tributary of the Copper River in the U.S. state of Alaska. Beginning near the southeastern end of Summit Lake in the Alaska Range, the river flows generally south to meet the larger river northeast of Glennallen. The Richa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glaciology
Glaciology (; ) is the scientific study of glaciers, or more generally ice and natural phenomena that involve ice. Glaciology is an interdisciplinary Earth science that integrates geophysics, geology, physical geography, geomorphology, climatology, meteorology, hydrology, biology, and ecology. The impact of glaciers on people includes the fields of human geography and anthropology. The discoveries of water ice on the Moon, Mars, Europa and Pluto add an extraterrestrial component to the field, which is referred to as "astroglaciology". Overview A glacier is an extended mass of ice formed from snow falling and accumulating over a long period of time; glaciers move very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of accumulation, as in continental glaciers. Areas of study within glaciology include glacial history and the reconstruction of past glaciation. A glaciologist is a person who studies glaciers. A glacial geologist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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