A modern analogue of western United States summer palaeoclimate at 6000 years before present
| Autor: | Cary J. Mock, Andrea R. Brunelle-Daines |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
010506 paleontology
Archeology Global and Planetary Change 010504 meteorology & atmospheric sciences Ecology Paleontology Forcing (mathematics) Before Present Monsoon 01 natural sciences Anticyclone Climatology Paleoclimatology Subtropical ridge Precipitation Geology Holocene 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | The Holocene. 9:541-545 |
| ISSN: | 1477-0911 0959-6836 |
| DOI: | 10.1191/095968399668724603 |
| Popis: | A modern summer-climate analogue of western United States 6 ka palaeoclimate, based on broad-scale patterns from proxy data and general-circulation-model simulations, provides details concerning its sum mer synoptic climatology. August 1955 serves as a close analogue, featuring an amplified subtropical ridge aloft and anticyclonic flow near the surface over the central United States and stronger westerly flow along the Canadian/northwest United States border. The August 1955 summer-temperature pattern, similar to those from general-circulation-model simulations, exhibits positive anomalies throughout most of the continental interior. The August 1955 precipitation pattern corresponds very closely with patterns of effective moisture from proxy data, showing widespread aridity and some stronger monsoonal activity in the Southwest. The analogue suggests that the amplified subtropical ridge is a very important feature of 6 ka palaeoclimate, with the circulation pattern differing from that in the early Holocene, implying interactions between both Milankovitch and sub-Milankovitch forcing factors. |
| Databáze: | OpenAIRE |
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