Stadial

Periods of colder climate during the Quaternary period

For the stadial theory in sociology, see Sociocultural evolution § Stadial theory.

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Stadials and interstadials are phases dividing the Quaternary period, or the last 2.6 million years. Stadials are periods of colder climate, and interstadials are periods of warmer climate.

Each Quaternary climate phase is associated with a Marine Isotope Stage (MIS) number, which describes the alternation between warmer and cooler temperatures, as measured by oxygen isotope data. Stadials have even MIS numbers, and interstadials have odd MIS numbers. The current Holocene interstadial is MIS 1, and the Last Glacial Maximum stadial is MIS 2.

Marine Isotope Stages are sometimes further subdivided into stadials and interstadials by minor climate fluctuations within the overall stadial or interstadial regime, which are indicated by letters. The odd-numbered interstadial MIS 5, also known as the Sangamonian interglacial, contains two periods of relative cooling, and so is subdivided into three interstadials (5a, 5c, 5e) and two stadials (5b, 5d). A stadial isotope stage like MIS 6 would be subdivided by periods of relative warming, and so in that case the first and last subdivisions would be stadials; MIS 6a, 6c and 6e are stadials while 6b and 6d are interstadials.

## Distinction between stadials and glacials[edit]

Generally, stadials endure for a thousand years or less and interstadials for less than ten thousand years, and interglacials last for more than ten thousand and glacials for about one hundred thousand. For a period to be considered an interglacial, it changes from Arctic through sub-Arctic to boreal to temperate conditions and back again. An interstadial reaches only the stage of boreal vegetation.[1]

The MIS 1 interstadial encompasses the entirety of the present Holocene interglacial, but the Wisconsin glaciation encompasses MIS 2, 3, and 4.

Glacials and interglacials refer to the 100,000-year cycles associated with Milankovitch cycles, and stadials and interstadials are defined by the actual oxygen-isotope temperature record.

## List of stadials and interstadials[edit]

### Bølling/Allerød interstadial[edit]

The Bølling oscillation and the Allerød oscillation, where they are not clearly distinguished in the stratigraphy, are taken together to form the Bølling/Allerød interstadial, and dated from about 14,700 to 12,700 years before the present.[2]

### Dryas Periods[edit]

The Oldest, Older, and Younger Dryas are three stadials that occurred during the warming since the Last Glacial Maximum. The Older Dryas occurred between the Bølling and Allerød interstadials. All three periods are named for the arctic plant species, Dryas octopetala, which proliferated during these cold periods.

### Dansgaard-Oeschger events[edit]

Greenland ice cores show 24 interstadials during the 100,000 years of the Wisconsin glaciation.[3] Referred to as the Dansgaard-Oeschger events, they have been extensively studied, and in their northern European contexts are sometimes named after towns, such as the Brorup, the Odderade, the Oerel, the Glinde, the Hengelo, or the Denekamp.

## See also[edit]

* Greenhouse and icehouse Earth
* Snowball Earth
* Milankovitch cycles
* Interglacial

## References[edit]

1. ^ Cox, Barry C.; Moore, Peter D.; Ladle, Richard (31 May 2016). "Ice and Change". Biogeography: an Ecological and Evolutionary Approach (9 ed.). John Wiley & Sons Ltd. p. 356\. ISBN 9781118968581. "The sequence of events demonstrated in the fossil material of such an interglacial shows a progressive change from high arctic conditions (virtually no life) through subarctic (tundra vegetation) to boreal (birch and pine forest) to temperate (deciduous forest) and then back through boreal to arctic conditions once more. If the warm event is only of a short duration, or the temperatures are not sufficiently high, then the vegetation changes may only reach a boreal stage of development. In this case, it's termed an interstadial."
2. ^ Cronin, Thomas M. (1999). Principles of Climatology. New York: Columbia University Press. p. 204.
3. ^ Wilson, R. C. L.; Drury, S. A.; Chapman, J. L. (2000). The Great Ice Age: Climate Change and Life. London: Routledge. p. 125\. ISBN 0-415-19841-0.

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Continental glaciations

General|

* Cordilleran Ice Sheet
* Laurentide Ice Sheet
* Last Glacial Maximum
* Canadian Shield
* Glacial history of Minnesota
* List of prehistoric lakes
* Proglacial lake
* Lake Agassiz
* Lake Chicago
* Lake Tight
* Teays River
* Post-glacial rebound
* Timeline of glaciation

Landforms|

| Erosional|

* Fjord
* Glacial striae
* Ribbon lake
* Roche moutonnée
* Tunnel valley
* U-shaped valley

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Depositional|

* Drumlin
* Erratic block
* Moraine
* Pulju moraine
* Rogen moraine
* Terminal moraine
* Till plain
* Veiki moraine

| Glacifluvial|

* Diluvium
* Esker
* Giant current ripples
* Kame
* Kame delta
* Kettle hole
* Outwash fan
* Sandur

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North America|

* Greenland

| Canada|

* Arrowhead Provincial Park, Ontario
* Big Rock (glacial erratic), Alberta
* Cypress Hills (Canada), Saskatchewan
* Eramosa River, Ontario
* Eskers Provincial Park, British Columbia
* Foothills Erratics Train, Alberta
* Lion's Head Provincial Park, Ontario
* Origin of the Oak Ridges Moraine, Ontario
* Ovayok Territorial Park, Nunavut

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United
States|

* Chippewa Moraine State Recreation Area, Wisconsin
* Coteau des Prairies, South Dakota
* Devil's Lake State Park, Wisconsin
* Glacial Lake Wisconsin, Wisconsin
* Glacial Lakes State Park, Minnesota
* Horicon Marsh State Wildlife Area, Wisconsin
* Ice Age Floods National Geologic Trail, Idaho, Oregon & Washington
* Ice Age National Scientific Reserve, Wisconsin
* Ice Age Trail, Wisconsin
* Interstate State Park, Minnesota & Wisconsin
* Kelleys Island, Ohio
* Kettle Moraine State Forest, Wisconsin
* Lake Bonneville, Utah
* Lake Lahontan, Nevada
* Lake Missoula, Montana
* Mill Bluff State Park, Wisconsin
* Oneida Lake, New York
* Two Creeks Buried Forest State Natural Area, Wisconsin
* Withrow Moraine and Jameson Lake Drumlin Field, Washington
* Yosemite National Park, California

Eurasia and
Antarctica|

* Antarctica
* Hardangerfjord
* Killary Harbour
* Lambert Glacier
* Monte Rosa
* Ross Ice Shelf
* Svalbard

Time periods|

* Quaternary glaciation
* Illinoian Stage
* Interglacial
* Interstadial
* Penultimate Glacial Period
* Last Glacial Period
* Last Glacial Maximum
* Mousterian Pluvial
* Holocene glacial retreat
* Oldest Dryas
* Older Dryas
* Pleistocene
* Pre-Illinoian Stage
* Quaternary glaciation
* Sangamonian Stage
* Wisconsin glaciation
* Bølling–Allerød warming
* Late Glacial Interstadial
* Huelmo–Mascardi Cold Reversal
* Younger Dryas
* 8.2 kiloyear event
* 4.2 kiloyear event
* Piora Oscillation
* Little Ice Age

* Category

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Greenhouse and Icehouse Earth

| Hothouse Earth

Hypothetical runaway greenhouse state

| Greenhouse Earth

Tropical temperatures may reach poles

| Icehouse Earth

Global climate during an ice age

| Snowball Earth

Earth's surface entirely or nearly frozen over

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Uninhabitably hot  | Warm period  | Interglacials | Interstadials and Stadials | Glacials | Cold period

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