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The Holocene is the current geological epoch. It began approximately 11,650 cal years before present, after the last glacial period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene has been identified with the current warm period, known as MIS 1. It is considered by some to be an interglacial period within the Pleistocene Epoch, called the Flandrian interglacial.
Paleoclimatology is the study of climates for which direct measurements were not taken. As instrumental records only span a tiny part of Earth's history, the reconstruction of ancient climate is important to understand natural variation and the evolution of the current climate. Paleoclimatology uses a variety of proxy methods from Earth and life sciences to obtain data previously preserved within rocks, sediments, boreholes, ice sheets, tree rings, corals, shells, and microfossils. Combined with techniques to date the proxies, these paleoclimate records are used to determine the past states of Earth's atmosphere.
The Younger Dryas was a return to glacial conditions after the Late Glacial Interstadial, which temporarily reversed the gradual climatic warming after the Last Glacial Maximum (LGM) started receding around 20,000 BP. It is named after an indicator genus, the alpine-tundra wildflower Dryas octopetala, as its leaves are occasionally abundant in late glacial, often minerogenic-rich sediments, such as the lake sediments of Scandinavia.
Palynology is literally the "study of dust" or of "particles that are strewn". A classic palynologist analyses particulate samples collected from the air, from water, or from deposits including sediments of any age. The condition and identification of those particles, organic and inorganic, give the palynologist clues to the life, environment, and energetic conditions that produced them.
In the study of past climates ("paleoclimatology"), climate proxies are preserved physical characteristics of the past that stand in for direct meteorological measurements and enable scientists to reconstruct the climatic conditions over a longer fraction of the Earth's history. Reliable global records of climate only began in the 1880s, and proxies provide the only means for scientists to determine climatic patterns before record-keeping began.
The global temperature record shows the fluctuations of the temperature of the atmosphere and the oceans through various spans of time. The most detailed information exists since 1850, when methodical thermometer-based records began. There are numerous estimates of temperatures since the end of the Pleistocene glaciation, particularly during the current Holocene epoch. Older time periods are studied by paleoclimatology.
An interglacial period is a geological interval of warmer global average temperature lasting thousands of years that separates consecutive glacial periods within an ice age. The current Holocene interglacial began at the end of the Pleistocene, about 11,700 years ago.
Paleolimnology is a scientific subdiscipline closely related to both limnology and paleoecology. Palaeolimnological studies are concerned with reconstructing the paleoenvironments of inland waters (lakes and streams;
Great Eastern Pingo Trail is a 9.2 kilometres long footpath along a disused railway line north of Thetford in Norfolk. It is a 4.2-hectare (10-acre) Local Nature Reserve, and it crosses three Sites of Special Scientific Interest, Thompson Water, Carr and Common, Breckland Forest and Cranberry Rough, Hockham. It also crosses Thompson Common, which is a nature reserve managed by the Norfolk Wildlife Trust and is a Nature Conservation Review site, Grade I. It further crosses Norfolk Valley Fens Special Area of Conservation and Breckland Special Protection Area.
The Subboreal is a climatic period, immediately before the present one, of the Holocene. It lasted from 3710 to 450 BCE.
Postglacial vegetation refers to plants that colonize the newly exposed substrate after a glacial retreat. The term "postglacial" typically refers to processes and events that occur after the departure of glacial ice or glacial climates.
Zhuye Lake is the terminal lake of the Shiyang River, which is located in the east of the Hexi Corridor in Gansu Province, China. Zhuye Lake is located in the marginal area of the Asian monsoon and is affected by both the Asian monsoon system and the Westerly jet. By understanding the Holocene record in Zhuye Lake, the interaction of different climate systems during the Holocene can be studied. At the same time, the Asian monsoon system is climatically dynamic; changes in its sphere of influence can result in severe drought or flood over large, densely populated, regions. In addition, Zhuye Lake and the surrounding area in arid NW China are in ecological imbalance – a consequence of human impacts and climate. Understanding the environmental history here can assist climatological forecasting of the Asian monsoon system and ecosystem reconstruction.
Marine Isotope Stage 5 or MIS 5 is a Marine Isotope Stage in the geologic temperature record, between 130,000 and 80,000 years ago. Sub-stage MIS 5e, called the Eemian or Ipswichian, covers the last major interglacial period before the Holocene, which extends to the present day. Interglacial periods which occurred during the Pleistocene are investigated to better understand present and future climate variability. Thus, the present interglacial, the Holocene, is compared with MIS 5 or the interglacials of Marine Isotope Stage 11.
Neor Lake is a shallow lake located in Ardabil Province in the Baghru mountain range in North West Iran. This lake was formed due to two fault zones during the Eocene period.
Elands Bay Cave is located near the mouth of the Verlorenvlei estuary on the Atlantic coast of South Africa's Western Cape Province. The climate has continuously become drier since the habitation of hunter-gatherers in the Later Pleistocene. The archaeological remains recovered from previous excavations at Elands Bay Cave have been studied to help answer questions regarding the relationship of people and their landscape, the role of climate change that could have determined or influenced subsistence changes, and the impact of pastoralism and agriculture on hunter-gatherer communities.
The paleo-climate of the Snake River Plain in southern Idaho, U.S., was much wetter and milder than today’s climate. During the Pliocene, the presence of a large lake provided habitat for fish. As the climate started to dry during the Pleistocene, vegetation similar to the present-day flora developed, although its geographical distribution was markedly different. Further drying occurred during the North American glaciation period that followed, resulting in the general aridity of the region today.
Cranberry Rough is an 81.1-hectare (200-acre) biological and geological Site of Special Scientific Interest in the parish of Hockham, east of Attleborough in Norfolk. It is a Nature Conservation Review site, Grade 2, and the Great Eastern Pingo Trail, which is a Local Nature Reserve, goes through the site. Part of it is a Geological Conservation Review site, and it is part of the Breckland Special Protection Area.
Changing climate conditions are amplified in polar regions and northern high-latitude areas are projected to warm at twice the rate of the global average. These modifications result in ecosystem interactions and feedbacks that can augment or mitigate climatic changes. These interactions may have been important through the large climate fluctuations since the glacial period. Therefore it is useful to review the past dynamics of vegetation and climate to place recent observed changes in the Arctic into context. This article focuses on northern Alaska where there has been much research on this theme.
Paleohydrology, or palaeohydrology, is the scientific study of the movement, distribution, and quality of water on Earth during previous periods of its history. The discipline uses indirect evidence to infer changes in deposition rates, the existence of flooding, changes in sea levels, changes in groundwater levels and the erosion of rocks. It also deals with alterations in the floral and faunal assemblages which have come about in previous periods because of changes in hydrology.
The prehistory of New England is an important topic of research for New England archaeologists. Humans reached the current-day New England region by at least 10,500 years ago and likely earlier, occupying a recently de-glaciated environment. Pre-contact Native American groups in New England did not have full-fledged market economies and physical artifacts tended to change very slowly. However, technological shifts brought agriculture and ceramics to the region prior to the arrival of European settlers in the 17th century.
References
- 1 2 "Cranberry Rough". Breaking New Ground. Retrieved 18 December 2020.
- ↑ "Norfolk Heritage Explorer". Norfolk County Council. Retrieved 18 December 2020.
- ↑ Bennett, K. D. (November 1983). "Devensian Late-Glacial and Flandrian Vegetational History at Hockham Mere, Norfolk, England. I. Pollen Percentages and Concentrations". The New Phytologist. 95 (3): 457–487. doi: 10.1111/j.1469-8137.1983.tb03512.x . JSTOR 2434313.