823 resultados para Ultracompact Dwarf Galaxies


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Pollen records from perennially frozen sequences provide vegetation and climate reconstruction for the last 48,000 14C years in the central part of Taymyr Peninsula. Open larch forest with Alnus fruticosa and Betula nana grew during the Kargin (Middle Weichselian) Interstade, ca. 48,000-25,000 14C yr B.P. The climate was generally warmer and wetter than today. Open steppe-like communities with Artemisia, Poaceae, Asteraceae, and herb tundralike communities with dwarf Betula and Salix dominated during the Sartan (Late Weichselian) Stade, ca. 24,000-10,300 14C yr B.P. The statistical information method used for climate reconstruction shows that the coldest climate was ca. 20,000-17,000 14C yr B.P. A warming (Allerød Interstade?) with mean July temperature ca. 1.5°C warmer than today occurred ca. 12,000 14C yr B.P. The following cooling with temperatures about 3°-4°C cooler than present and precipitation about 100 mm lower corresponds well with the Younger Dryas Stade. Tundra-steppe vegetation changed to Betula nana-Alnus fruticosa shrub tundra ca. 10,000 14C yr B.P. Larch appeared in the area ca. 9400 14C yr B.P. and disappeared after 2900 14C yr B.P. Cooling events ca. 10,500, 9600, and 8200 14C yr B.P. characterized the first half of the Holocene. A significant warming occurred ca. 8500 14C yr B.P., but the Holocene temperature maximum was at about 6000-4500 14C yr B.P. The vegetation cover approximated modern conditions ca. 2800 14C yr B.P. Late Holocene warming events occurred at ca. 3500, 2000, and 1000 14C yr B.P. A cooling (Little Ice Age?) took place between 500 and 200 14C yr ago.

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This chapter provides a review of proxy data from a variety of natural archives sampled in the Wollaston Forland region, central Northeast Greenland. The data are used to describe long-term environmental and climatic changes. The focus is on reconstructing the Holocene conditions particularly in the Zackenberg area. In addition, this chapter provides an overview of the archaeological evidence for prehistoric occupation of the region. The Zackenberg area has been covered by the Greenland Ice Sheet several times during the Quaternary. At the Last Glacial Maximum (LGM, about 22,000 years BP), temperatures were much lower than at present, and only very hardy organisms may have survived in the region, even if ice-free areas existed. Marked warming at around 11,700 years BP led to ice recession, and the Zackenberg area was deglaciated in the early Holocene, prior to 10,100 years BP. Rapid early Holocene land emergence was replaced by a slight transgression in the late Holocene. During the Holocene, summer solar insolation decreased in the north. Following deglaciation of the region, summer temperatures probably peaked in the early to mid-Holocene, as indicated by the occurrence of a southern beetle species. However, the timing for the onset of the Holocene thermal maximum is rather poorly constrained because of delayed immigration of key plant species. During the thermal maximum, the mean July temperature was at least 2-3°C higher than at present. Evidence for declining summer temperatures is seen at around 5500, 4500 and 3500 years BP. The cooling culminated during the Little Ice Age that peaked about 100-200 years ago. The first plants that immigrated to the region were herbs and mosses. The first dwarf shrubs arrived in Northeast Greenland prior to 10,400 years BP, and dwarf birch arrived around 8800 years BP. The first people arrived about 4500 years BP, but the region was depopulated several times before the last people disappeared some time after 1823 AD, perhaps as a consequence of poor hunting conditions during the peak of the Little Ice Age.

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Cover title.

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List of contents at end of vol. [48].

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The ramparts of Port Royal.--The bewitchment of Lieutenant Hanworthy.--Gaspar of the Black Le Marchands.--Brown witch and Black Abbé.--La Mouche.--A tragedy of the tides.--The blue dwarf of Belle Mare.--By the thickness of a door.--How Viardeau obeyed the Black Abbé.--Grûl's gift.--The maid of the drift.--The eye of Gluskâp.

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Each volume has added title-page engraved, with vignette and engraved dedication.

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Ed. by Andrew Lang.

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v. 1. Waverly. Guy Mannering.--v. 2. The antiquary. The black dwarf. Old mortality.--v. 3. Rob Roy. The heart of Mid-Lothian.--v. 4. The bride of Lammermoor. A legend of Montrose. Ivanhoe.--v. 5. The monastery. The abbot.--v. 6. Kenilworth. The pirate.--v. 7. The fortunes of Nigel. Peveril of the Peak.--v. 8. Quentin Durward. St. Ronan's well.--v. 9. Redgauntlet. The bethrothed. The talisman.--v. 10. Woodstock. The Highland widow. The two drovers. The surgeon's daughter.--v. 11. The fair maid of Perth. Anne of Geierstein.--v. 12. Count Robert of Paris. Castle Dangerous. My Aunt Margaret's mirror. The tapestried chamber. The laird's Jock. Index and glossary.

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Each volume has special t.p.; title vignettes.

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I. Introductory memoir. St. Giles and St. James. Punch's letters to his son.--II. The story of a feather. Cakes and ale.--III. Mrs. Caudle's curtain lectures. Men of character. Punch's complete letter writer.--IV. A man made of money. Sketches of the English. The chronicles of Clovernook. The sick giant and the doctor dwarf.

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Letter to John Cairns, D.D.--Dr. Chalmers.--Dr. George Wilson.--Her last half-crown.--Queen Mary's child-garden.--Our dogs.--Notes on art.--Oh, I'm wat, wat!--Education through the senses.--Ayxiroia.--The black dwarf's bones.--Rab and his friends.--With brains, sir!--Arthur H. Hallam.

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On spine: New edition, with the author's notes.

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Imperfect: List of subscribers wanting.

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"March 1996."