DOI: 10.5194/cp-12-189-2016
Scopus记录号: 2-s2.0-84956877732
论文题名: A 250-year periodicity in Southern Hemisphere westerly winds over the last 2600 years
作者: Turney C.S.M. ; Jones R.T. ; Fogwill C. ; Hatton J. ; Williams A.N. ; Hogg A. ; Thomas Z.A. ; Palmer J. ; Mooney S. ; Reimer R.W.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 2 起始页码: 189
结束页码: 200
语种: 英语
Scopus关键词: airflow
; atmosphere-ocean system
; charcoal
; climate variation
; global climate
; Holocene
; paleoclimate
; periodicity
; pollen
; solar radiation
; Southern Hemisphere
; temperature anomaly
; westerly
; Falkland Islands (Malvinas)
; Patagonia
英文摘要: Southern Hemisphere westerly airflow has a significant influence on the ocean-atmosphere system of the mid-to high latitudes with potentially global climate implications. Unfortunately, historic observations only extend back to the late 19th century, limiting our understanding of multi-decadal to centennial change. Here we present a highly resolved (30-year) record of past westerly wind strength from a Falkland Islands peat sequence spanning the last 2600 years. Situated within the core latitude of Southern Hemisphere westerly airflow (the so-called furious fifties), we identify highly variable changes in exotic pollen and charcoal derived from South America which can be used to inform on past westerly air strength. We find a period of high charcoal content between 2000 and 1000. BP, associated with increased burning in Patagonia, most probably as a result of higher temperatures and stronger westerly airflow. Spectral analysis of the charcoal record identifies a pervasive ca. 250-year periodicity that is coherent with radiocarbon production rates, suggesting that solar variability has a modulating influence on Southern Hemisphere westerly airflow. Our results have important implications for understanding global climate change through the late Holocene. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49069
Appears in Collections: 气候变化与战略
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Recommended Citation:
Turney C.S.M.,Jones R.T.,Fogwill C.,et al. A 250-year periodicity in Southern Hemisphere westerly winds over the last 2600 years[J]. Climate of the Past,2016-01-01,12(2)