Milankovitch cycles


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Milankovitch cycles

[mē·lən′kō·vich ‚sīk·əlz]
(geophysics)
Periodic variations in the earth's position relative to the sun as the earth orbits, affecting the distribution of the solar radiation reaching the earth and causing climatic changes that have profound impacts on the abundance and distribution of organisms, best seen in the fossil record of the Quaternary Period (the last 1.6 million years).
References in periodicals archive ?
So, Meyers sought a way to better account for just what our planetary neighbors were doing billions of years ago in order to understand the effect they had on Earth and its Milankovitch cycles. This was the problem he brought with him to a talk he gave at Columbia University's Lamont-Doherty Earth Observatory while on sabbatical in 2016.
These are known as Milankovitch Cycles, named after Serbian astronomer, geophysicist, and mathematician Milutin Milankovic (1879-1958).
The new research shows that recurring changes in Earth's orbital path known as Milankovitch Cycles cause an increase in Southern Hemisphere sea ice on 100,000-year cycles, and that sunlight reflecting off the increased ice in turn curbs incoming solar radiation and causes global temperatures to cool, kicking off each cyclic phase of significantly expanding glacial ice--or ice age--around the globe.
[2] Ji-feng, Y., Feng-gui, S., Zeng-xue, Li., Hua, L., Yulin, W.: "Recognition of Milankovitch cycles in the stratigraphic record: application of the CWT and the FFT to well log data", Journal of China University of Mining and Technology, Vol.
Since this study, the National Research Council of the US National Academy of Sciences has embraced the Milankovitch Cycles model.
Known as Milankovitch cycles after the first scientist to fully compute them from planetary data, it has been shown that these factors have regulated the advance and retreat of ice-caps.
It appears likely that other factors (in addition to sea-level changes) determined the speciation patterns of the Tertiary faunas in these continental regions such as paleoclimatic fluctuations caused by Milankovitch cycles (see below) leading to frequent ecological vicariance events and the formation of temporary forest and nonforest refugia during the Tertiary (Refuge hypothesis; see below).
Milankovitch cycles and other climate rhythms that operate at different timescales), dynamically patterned disorder (termed chaos by Gleick 1987) and real randomness in the climate system are equally applicable to global markets and economies.
The intricate, multistage cyclicity in the Riksu Formation can be best explained by variations in solar radiation, caused by cyclic changes in the Earth's axial and orbital parameters known as Milankovitch cycles. These variations cause expansion and contraction of continental glaciers, leading to sea level fluctuation and change in sediment input (Imbrie & Imbrie 1979).
Assign a team of students to research Milankovitch Cycles and to conduct a seminar on the phenomena for the class.
The other two Milankovitch cycles, the precession index (with periods of 19,000 and 23,000 years) and the eccentricity of the Earth's orbit (100,000 and 400,000 years), are less well understood but are also important for ice ages.
Subtle quasi-cyclic variations in earth-sun orbital geometry, known as "Milankovitch cycles" are believed to be largely responsible for Quaternary glacial variability--the "Ice Ages." We are now learning that these orbital changes also affected climate in earlier times, and perhaps throughout earth history.