Cyclone and Anticyclone
Cyclone and Anticyclone
The terms cyclone and anticyclone are used to describe areas of low and high atmospheric pressure, respectively. Air flowing around one or the other of these areas is said to be moving cyclonically in the first case and anticyclonically in the second. In the northern hemisphere, cyclonic winds travel in a counterclockwise direction and anticyclonic winds, in a clockwise direction. When a cyclone or anticyclone is associated with a wave front, it is called a wave, a frontal, or a mid-latitude cyclone or anticyclone.
Vertical air movements are associated with both cyclones and anticyclones. In the former case, air close to the ground is forced inward, toward the center of a cyclone, where pressure is lowest, and then begins to rise upward. At some height, the rising air begins to diverge outward away from the cyclone center.
In an anticyclone, the situation is reversed. Air at the center of an anticyclone is forced away from the high pressure that occurs there and is replaced by a downward draft of air from higher altitudes. That air is replaced, in turn, by a convergence of air from higher altitudes moving into the upper region of the anticyclone.
Distinctive weather patterns tend to be associated with both cyclones and anticyclones. Cyclones and low pressure systems are generally harbingers of rain, clouds, and other forms of bad weather, while anticyclones and high pressure systems are predictors of fair weather.
One factor in the formation of cyclones and anti-cyclones may be the development of irregularities in a jet stream. When streams of air in the upper atmosphere begin to meander back and forth along an east-west axis, they may add to cyclonic or anticyclonic systems that already exist in the lower troposphere. As a result, relatively stable cyclones (or anticyclones) or families of cyclones (or anticyclones) may develop and travel in an easterly or northeasterly direction across the continent.
On relatively rare occasions, such storms may gain enough energy to be destructive of property and human life. Tornadoes and possibly hurricanes are examples of such extreme conditions.
See also Tornado; Wind.
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Those beyond the walls: the Mycenaean era is known mostly for the great palaces at Mycenae, Pylos, and Tiryns. But what about the working people? It is necessary, and important, to look beyond the palace walls to find out how they lived.
Magazine article from: Calliope; 9/1/2002; ; 700+ words
; ...cloth and clothes. Historians have learned this information from Linear B tablets found in palaces such as those at Pylos and Tiryns. The evidence clearly proves that most non-royals worked hard to earn their living, whether they were directly or indirectly...
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The LH IIIB-LH IIIC transition on the Mycenaean mainland: ceramic phases and terminology.
Magazine article from: Hesperia; 3/22/2006; ; 700+ words
; ...Furumark. (4) After the excavations at Tiryns and Mycenae in the 1950s, however, a...subdivisions of both LH IIIB1 and LH IIIB2 at Tiryns and Mycenae. (6) Mountjoy has recently...to the end of LH IIIB2 at Mycenae and Tiryns, or if it must be regarded as a stylistic...
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Hydra of Mythology Rooted in Reality, Researcher Asserts
Newspaper article from: The Washington Post; 12/5/1988; ; 625 words
; ...the region around the ancient cities of Tiryns and Lerna there was once a saltwater bay...Mycenaean decline. In the nearby city of Tiryns, Zangger has found evidence of another...the course of ancient civilization. At Tiryns, where the ancient temple has long been...
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Pascal Darcque. L'habitat mycenien: formes et functions de l'espace bati en Grece continentale a la fin du IIe millenaire avant J.-C.(Book review)
Magazine article from: Antiquity; 9/1/2007; ; 700+ words
; ...investigations at several major sites (Mycenae, Tiryns, Midea, Pylos) could not be included...buildings; the bulk come from Mycenae and Tiryns, but a substantial number from Nichoria...to-date general plans of Mycenae, Tiryns, Thebes and Gla; the map of Thebes...
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Excavations on the acropolis of Midea: results of the Greek-Swedish excavations -- the excavations of the lower terraces 1985-1991.(Review) (book review)
Magazine article from: Antiquity; 3/1/2000; ; 700+ words
; ...large fortified Mycenaean site of the Argolid, with Mycenae and Tiryns. It is a lofty acropolis which offers a very fine view of the...map. Though not a major settlement on the model of Mycenae or Tiryns, it was surely an administr
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A deposit of Late Helladic IIIB1 pottery from Tsoungiza.(DISCUSSION AND CONCLUSIONS)
Magazine article from: Hesperia; 9/22/2005; ; 700+ words
; ...Schonfeld has reported that they appear in LH IIIB early contexts at Tiryns. (172) In light of these considerations, along with the...present not only at Argivo-Corinthian sites such as Mycenae, Tiryns, Zygouries, and Tsoungiza, but also at Nichoria in Messenia...
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Pictorial Library of Bible Lands
Magazine article from: Trinity Journal; 4/1/2005; ; 700+ words
; ...Isthmia, Meteora, Mt Olympus, Mycenae, Neapolis, Nicopolis, Olympia, Patmos, Philippi, scenes of Greece, Thessalonica, Tiryns. CD 10 Rome: Arch of Titus, basilicas of Rome, Church of St Paul Outside the Walls, Circus Maximus, Colosseum, Forum...
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Homer proves correct.(sites described by ancient Greek poet in 'The Iliad' and 'The Odyssey' discovered)
Magazine article from: Calliope; 9/1/2002; ; 700+ words
; ...before frustration forced him to leave. After briefly exploring other sites in the area, including the Mycenaean citadel of Tiryns, he returned to Troy. Heinrich Schliemann is pronounced HINE rik SHLEE-man The Trojan War was waged against the city of...
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On land and sea.(Minoan civilization and Mycenaen civilization)
Magazine article from: Calliope; 9/1/2002; ; 700+ words
; ...outlying settlements and palaces. For the rulers of Mycenae, these included the important palaces of Pylos and neighboring Tiryns. Minoan settlements stretched across Crete, and perhaps onto neighboring islands. Minoan trade routes crisscrossed the Mediterranean...
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LH III C chronology and synchronisms II LH III C middle; proceedings.(Brief article)(Book review)
Magazine article from: Reference & Research Book News; 2/1/2009; 502 words
; ...Topics include pictorial pottery of LHIII C Middle and its antecedents, the post-palatial settlement in the lower citadel of Tiryns, and Lefkandi in late Helladic III C Middle. Distributed in North America by The David Brown Book Co. ([c]2009 Book News...
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Tiryns
Book article from: The Columbia Encyclopedia, Sixth Edition
Tiryns , ancient city of Greece, in the NE Peloponnesus, 2.5 mi (4 km) N of Nauplia (now Návplion) and near Argos...
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Hercules
Book article from: Myths and Legends of the World
...Greek warrior and heir to the throne of Tiryns. One night while Amphitryon was away...oracle told him to go to King Eurystheus of Tiryns and submit to any punishment asked of...to capture it. As he was taking it to Tiryns, Artemis stopped him and demanded that...
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Heinrich Schliemann
Encyclopedia entry from: Encyclopedia of World Biography
...Schliemann's Ilios of 1880. The last 6 years of Schliemann's life were spent with further excavations at the citadel of Tiryns (1884) and at Orchomenos (1886), with plans for work in Egypt and Crete and with actual excavation starts on Cythera and...
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goldwork
Book article from: The Columbia Encyclopedia, Sixth Edition
...goldwork (jewelry, death masks, drinking cups, vases, weapons, and dress ornaments) have been found at Troy, Mycenae, and Tiryns. The goldwork of the Achaemenid dynasty of Persia (6th-4th cent. BC) is noted for its extreme opulence and for the technical...
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Cyclopean
Book article from: The Columbia Encyclopedia, Sixth Edition
...uneven face. These walls were characteristic of Mycenaean civilization . Remaining examples are found at Knossos, Mycenae, Tiryns, and Athens. There are many Cyclopean walls in Etruscan and Anatolian architecture. Somewhat similar examples are seen in...
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