A glacier is a persistent body of dense ice that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such as crevasses and seracs, as it slowly flows and deforms under stresses induced by its weight. As it moves, it abrades rock and debris from its substrate to create landforms such as cirques, moraines, or fjords. Although a glacier may flow into a body of water, it forms only on land and is distinct from the much thinner sea ice and lake ice that form on the surface of bodies of water.
Mount Kilimanjaro is a dormant volcano in Tanzania. It is the highest mountain in Africa and the highest free-standing mountain above sea level in the world: 5,895 m (19,341 ft) above sea level and 4,900 m (16,100 ft) above its plateau base. It is also the highest volcano in the Eastern Hemisphere and the fourth most topographically prominent peak on Earth.
The Last Glacial Period (LGP), also known as the Last glacial cycle, occurred from the end of the Last Interglacial to the beginning of the Holocene, c. 115,000 – c. 11,700 years ago, and thus corresponds to most of the timespan of the Late Pleistocene.
The Byrd Polar and Climate Research Center (BPCRC) is a polar, alpine, and climate research center at Ohio State University founded in 1960.
In glaciology, an ice cap is a mass of ice that covers less than 50,000 km2 (19,000 sq mi) of land area. Larger ice masses covering more than 50,000 km2 (19,000 sq mi) are termed ice sheets.
Glacial motion is the motion of glaciers, which can be likened to rivers of ice. It has played an important role in sculpting many landscapes. Most lakes in the world occupy basins scoured out by glaciers. Glacial motion can be fast or slow, but is typically around 25 centimetres per day (9.8 in/d).
Lonnie Thompson, is an American paleoclimatologist and university professor in the School of Earth Sciences at Ohio State University. He has achieved global recognition for his drilling and analysis of ice cores from ice caps and mountain glaciers in the tropical and sub-tropical regions of the world. He and his wife, Ellen Mosley-Thompson, run the ice core paleoclimatology research group at the Byrd Polar Research Center.
The retreat of glaciers since 1850 is a well-documented effect of climate change. The retreat of mountain glaciers provide evidence for the rise in global temperatures since the late 19th century. Examples include mountain glaciers in western North America, Asia, the Alps in central Europe, and tropical and subtropical regions of South America and Africa. Since glacial mass is affected by long-term climatic changes, e.g. precipitation, mean temperature, and cloud cover, glacial mass changes are one of the most sensitive indicators of climate change. The retreat of glaciers is also a major reason for sea level rise. Excluding peripheral glaciers of ice sheets, the total cumulated global glacial losses over the 26 years from 1993 to 2018 were likely 5500 gigatons, or 210 gigatons per year.
Sperry Glacier is a glacier on the north slopes of Gunsight Mountain west of the Continental Divide in Glacier National Park in the U.S. state of Montana. Although many geologic features of Glacier National Park were formed during the much longer period of glaciation ending over 10,000 years ago, Sperry Glacier — like all the glaciers in the park today — is a product of the recent Little Ice Age, the period of cooler average temperatures starting in about the 13th century and concluding in the mid-19th century.
Furtwangler Glacier is located near the summit of Mount Kilimanjaro in Tanzania. The glacier is named after Walter Furtwängler who, with Siegfried König, formed the fourth party to ascend to the summit of Kilimanjaro in 1912.
Johannes Rebmann, also sometimes anglicised as John Rebman, was a German missionary, linguist, and explorer credited with feats including being the first European, along with his colleague Johann Ludwig Krapf, to enter Africa from the Indian Ocean coast. In addition, he was the first European to find Kilimanjaro. News of Rebmann's discovery was published in the Church Missionary Intelligencer in May 1849, but disregarded as mere fantasy for the next twelve years. The Geographical Society of London held that snow could not possibly occur let alone persist in such latitudes and considered the report to be the hallucination of a malaria-stricken missionary. It was only in 1861 that researchers began their efforts to measure Kilimanjaro. Expeditions to Tanganyika between 1861 and 1865, led by the German Baron Karl Klaus von der Decken, confirmed Rebmann's report. Together with his colleague Johann Ludwig Krapf they were also the first Europeans to visit and report Mount Kenya. Their work there is also thought to have had effects on future African expeditions by Europeans, including the exploits of Sir Richard Burton, John Hanning Speke, and David Livingstone.
A hanging glacier originates high on the wall of a glacial valley and descends only part of the way to the surface of the main glacier and abruptly stops, typically at a cliff. Avalanching and icefalls are the mechanisms for ice and snow transfer to the valley floor below.
Glaciar Norte was a glacier located on the volcanic peak of Popocatépetl in the Mexican State of Puebla. In 1964, the glacier was estimated to be 600 metres (2,000 ft) long and cover 0.2 square kilometres (0.077 sq mi) on the north side of Popocatépetl. Glaciar Norte is connected to Glaciar del Ventorrillo, which lies to the west. In a study published in 2006, all the glaciers atop Popocatépetl had essentially disappeared due to increased volcanic activity. In the 1990s, the glaciers greatly decreased in size, partly due to warmer temperatures but largely due to increased volcanic activity. By early 2001, Popocatepetl's glaciers had become extinct; ice remained on the volcano, but no longer displayed the characteristic features of glaciers such as crevasses.
Arrow Glacier is located near the summit of Mount Kilimanjaro in Tanzania, on the west slope of the peak and is a small remnant of an icecap which once crowned the summit of Mount Kilimanjaro. The glacier is situated at an elevation of between 5,470 and 5,300 metres. Arrow Glacier is adjacent to a climbing route known as the Western Breach/Arrow Glacier Route or more commonly, the Lemosho Route. Arrow Glacier is a recently named glacial remnant that may not even exist as of 2011. It was what remained of an earlier glacier known as the Little Barranco Glacier.
Barranco Glacier is near the summit of Mount Kilimanjaro in Tanzania, on the southwest slope of the peak and is a small remnant of an icecap which once crowned the top of Mount Kilimanjaro. The glacier is situated at an elevation of between 5,200 and 4,800 metres. The Great Barranco Glacier was far larger when first documented in the late 19th century and it along with the now extinct Little Barranco Glacier may have been fed by the Furtwängler Glacier which is on the top of the mountain. By 2011, Barranco Glacier was reduced to two small disconnected and dormant ice bodies.
Credner Glacier is on Mount Kilimanjaro in Tanzania, on the northwest slope of the peak and is a remnant of an icecap which once crowned the top of Mount Kilimanjaro. The glacier is situated at an elevation of between 5,800 and 5,500 metres. Credner Glacier is one of the largest glaciers on the mountain and descends from the Northern Ice Field. Credner is rapidly retreating due to its high exposure point on the northwest slope of Mount Kilimanjaro. A report published in 2013 indicated that in another decade the glacier may no longer exist.
Great Penck Glacier was on Mount Kilimanjaro in Tanzania, on the west slope of the peak. Extending from the Northern Ice Field, the glacier once flowed 2.4 kilometres (1.5 mi), to an elevation of 4,750 metres (15,580 ft). Between the years 1962 and 1975, Great Penck Glacier separated from the Northern Icefield and disappeared. Drygalski Glacier once also existed to the north of Great Penck, while the same is true of the Little Penck Glacier, which was to the south.
The Northern Ice Field is near the summit of Mount Kilimanjaro in Tanzania, on the west slope of the peak. The Northern Ice Field and Eastern Ice Fields were connected to the Southern Ice Field and formed part of a continuous body of glacial ice atop Mount Kilimanjaro when first scientifically examined in 1912. By 1962 the Southern Ice Field separated from the Northern Ice Field and then by 1975 the Eastern Ice Field did as well. In 1912, the glaciated areas atop Mount Kilimanjaro covered 11.40 square kilometres (4.40 sq mi); by 2011 this had been reduced to 1.76 square kilometres (0.68 sq mi), an 85 percent loss. At one time, ice flowing off the Northern Ice Field fed numerous glaciers, including, north to south, the Credner, Drygalski, Great Penck and Little Penck Glaciers.
