ISSN:0273-8457    

DOI:10.1080/10889379109377458

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0273-8457    

DOI:10.1080/10889379109377459

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The focus of the article is the negative changes which can be expected in the world's glaciers associated with possible “greenhouse”; warming of the climate. It examines the mechanisms of the instability of marine ice sheets, which may lead to their catastrophic collapse and to a rise in sea level of 5–7 m over the next few decades. Calculations have been made concerning the extreme regimes of mountain glaciers in temperate and subtropical latitudes, which would involve a sharply negative mass balance (up to ‐3 to ‐5 m per year); this regime will lead to a rapid disappearance of these glaciers.

ISSN:0273-8457    

DOI:10.1080/10889379109377460

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

An analysis of primary productivity reveals a valid positive correlation with climatic indices (mean July temperature, degree days above 0°C, and summer precipitation) when one compares polar deserts, arctic tundra and typical subarctic tundra. This correlation does not apply, however, when one compares typical and southern subarctic tundra. The analysis also suggests that there are viable grounds for distinguishing polar deserts, arctic tundra, and subarctic tundra as independent zones, rather than classing the arctic tundra and subarctic tundra as subzones of the tundra zone.

ISSN:0273-8457    

DOI:10.1080/10889379109377461

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Spore‐ and pollen diagrams from samples at five different depths in theyedomasediments of the Duvanyy Yar exposure on the Kolyma River were analyzed. For each sample range diagrams (diagrams of percentage occurrence of the species identified in the sample, in terms of the present vegetation) were compiled in order to locate the best match in terms of species composition in the present vegetation. This technique permits an evaluation of the probable climate at the time of deposition. The results indicate that the oldest deposits (at a depth of 47 m) correlate with the second period of the Zyryan Glaciation; samples at higher levels derive from the Kargin Interstadial and the subsequent Sartan glacial phase. The range diagram technique suggests that conditions during the Kargin Interstadial matched those of the Holocene quite closely.

ISSN:0273-8457    

DOI:10.1080/10889379109377462

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The authors present a description of the structure and morphology of the East Novaya Zemlya Trough, running parallel to the axis of Novaya Zemlya in the western part of the Kara Sea. Having analyzed the available data on the structure of the trough and the unconsolidated sediments within it, they conclude that the tectonic movements responsible for its origin began at the Paleogene/Neogene boundary. While some relatively minor movements occurred at the late Pleistocene/Holocene boundary, these simply represented the latest in a long series of such movements and were not responsible for the major features of the trough, as some authors have suggested. Although some glacial scouring of the trough has occurred, glacial erosion is not primarily responsible for its present form, nor is glacio‐isostatic depression responsible for any significant proportion of its depth.

ISSN:0273-8457    

DOI:10.1080/10889379109377463

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0273-8457    

DOI:10.1080/10889379109377457

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor