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PALEO CLIMATE

PALEO CLIMATE. Eko Haryono. Milancovic Cycle.

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PALEO CLIMATE

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  1. PALEO CLIMATE EkoHaryono

  2. Milancovic Cycle

  3. Past and future Milankovitch cycles. VSOP allows prediction of past and future orbital parameters with great accuracy. ε is obliquity (axial tilt). e is eccentricity. ϖ is longitude of perihelion. esin(ϖ) is the precession index, which together with obliquity, controls the seasonal cycle of insolation. is the calculated daily-averaged insolation at the top of the atmosphere, on the day of the summer solstice at 65 N latitude

  4. The last Glacial Extreme

  5. Milankovitch theory describes the collective effects of changes in the Earth's movements upon its climate, named after Serbiancivil engineer and mathematicianMilutin Milanković, who worked on it during First World War internment. Milanković mathematically theorized that variations in eccentricity, axial tilt, and precession of the Earth's orbit determined climatic patterns on Earth through orbital forcing.

  6. SOLAR CYCLE • The solar cycle, or the solar magnetic activity cycle, is a periodic change in the amount of irradiation from the Sun that is experienced on Earth. It has a period of about 11 years, and is one component of solar variation, the other being aperiodic fluctuations.

  7. Solar activity events and approximate dates

  8. Dalton Minimum • The Dalton Minimum was a period of low solar activity, named after the English meteorologist John Dalton, lasting from about 1790 to 1830. the Dalton Minimum coincided with a period of lower-than-average global temperatures. The Oberlach Station in Germany, for example, experienced a 2.0°C decline over 20 years.[2] • The precise cause of the lower-than-average temperatures during this period is not well understood. Recent papers have suggested that a rise in volcanism was largely responsible for the cooling trend.[3] • While The Year Without a Summer, in 1816

  9. Maunder Minimum • The Maunder Minimum (also known as the prolonged sunspot minimum) is the name used for the period roughly spanning 1645 to 1715 when sunspots became exceedingly rare, as noted by solar observers of the time (John A. Eddy) • Edward W. Maunder (1851–1928), Astronomer

  10. The Sporer • The Spörer Minimum was a 90-year span of low solar activity, from about 1460 until 1550, which was identified and named by John A. Eddy

  11. Medieval Warm Period (MWP) • The Medieval Warm Period (MWP), Medieval Climate Optimum, or Medieval Climatic Anomaly was a time of warmclimate in the North Atlantic region, that may also have been related to other climate events around the world during that time, including in China,[1]New Zealand,[2] and other countries

  12. Litle Ice Age

  13. The Little Ice Age (LIA) was a period of cooling that occurred after the Medieval Warm Period (Medieval Climate Optimum).[1] While not a true ice age, the term was introduced into scientific literature by François E. Matthes in 1939.[2] It is conventionally defined as a period extending from the 16th to the 19th centuries. • NASA defines the term as a cold period between 1550 AD and 1850 AD and notes three particularly cold intervals: one beginning about 1650, another about 1770, and the last in 1850, each separated by intervals of slight warming • The "Little Ice Age" can only be considered as a modest cooling of the Northern Hemisphere during this period of less than 1°C relative to late 20th century levels.[7]

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