2016
DOI: 10.5194/cp-12-189-2016
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A 250-year periodicity in Southern Hemisphere westerly winds over the last 2600 years

Abstract: Abstract. 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 S… Show more

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Cited by 43 publications
(40 citation statements)
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“…This indicates that productivity in LH followed these short term changes in irradiance (P erez-Rodr ıguez et al 2016). Similar periodicity in past climatic changes in Patagonia has been observed in other studies (Turney et al 2016).…”
Section: Resultssupporting
confidence: 89%
“…This indicates that productivity in LH followed these short term changes in irradiance (P erez-Rodr ıguez et al 2016). Similar periodicity in past climatic changes in Patagonia has been observed in other studies (Turney et al 2016).…”
Section: Resultssupporting
confidence: 89%
“…Asynchronous forest expansions may been noted in pollen data from the Falkland Islands, where variability in westerly intensity has been ascribed to oscillations in solar irradiance, namely the effects of the de Vries/Suess solar cycle (Turney et al 2016). Although our data lack the temporal resolution to register these highfrequency changes, our results show peaks in tree abundance throughout the eastern flanks of the Andes at ca.…”
mentioning
confidence: 69%
“…Ocean (Moy et al, 2002) and with high solar irradiance (Turney et al, 2016). A tree-ring reconstruction from Tasmania (Cook et al, 1999) suggests that, in the southern hemisphere, higher solar output at the time led to increased summer temperatures (Lüdecket et al, 2015).…”
mentioning
confidence: 97%
“…The timing of the hiatus in upper tree growth is observed in other sectors of the Southern Ocean that are highly sensitive to changes in westerly airflow. The absence of Dracophyllum wood at (Turney et al, 2015), biogenic carbonate accumulation rate (AR) from Palm2, Chile (53˚S) (stars denote volcanic ash horizons, triangles 14 C ages) (Lamy et al, 2010) (C) and sea surface temperature (SST) from ODP-1098 (65˚S, Palmer Deep), west Antarctic Peninsula (Shevenell et al, 2011) (D). elevation is synchronous with the enhanced delivery of South American (exotic) pollen and microcharcoal to the Falkland Islands, interpreted to represent stronger winds between 2 and 1 ka (Fig.…”
Section: Holocene Changesmentioning
confidence: 99%
“…peats and trees) on subantarctic islands offer the potential to generate high-resolution records of changes in subpolar westerly airflow across the Southern Ocean. Recent work from Canopus Hill on the Falkland Islands in the South Atlantic (52˚S) (Turney et al, 2015) suggests a phase of enhanced flow between 1.8 and 1.0 ka based on the aerial transportation of exotic pollen and microcharcoal particles (<106 mm) from South America, providing direct evidence of stronger winds at this latitude across this period. Other workers, however, have suggested the last 5 ka was characterized by asymmetrical flow across the hemisphere (Fletcher and Moreno, 2012), which would imply the enhanced flow identified on the Falklands was only of regional significance.…”
Section: Introductionmentioning
confidence: 99%