2022
DOI: 10.1175/bams-d-22-0092.1
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Global Climate

Abstract: 2021, coinciding with a large ozone hole persisting until December (sections 2g4, 6h). The equatorial stratosphere's quasi-biennial oscillation progressed in 2021 as it usually has for more than half a century: downward-propagating easterly and westerly wind regimes and accompanying temperature variations, with a mean periodicity of somewhat more than two years. This regular downward propagation from the upper to lower stratosphere was interrupted in both 2016 and 2020, but more regular evolution appeared to r… Show more

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Cited by 27 publications
(6 citation statements)
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“…As for the class 9 wind frequency, a consistent decrease is found in nearly all continents (figure 5(i)). This rapid decrease in strong wind concords with a series of earlier regional studies conducted in America (Pryor et al 2007(Pryor et al , 2009, China (Guo et al 2011, Zha et al 2017, Central Asia (Dunn et al 2022b), the United Kingdom (Earl et al 2013) and Spain and Portugal (Azorin-Molina et al 2016).…”
Section: Frequency Changes Of Global and Regional Swssupporting
confidence: 58%
“…As for the class 9 wind frequency, a consistent decrease is found in nearly all continents (figure 5(i)). This rapid decrease in strong wind concords with a series of earlier regional studies conducted in America (Pryor et al 2007(Pryor et al , 2009, China (Guo et al 2011, Zha et al 2017, Central Asia (Dunn et al 2022b), the United Kingdom (Earl et al 2013) and Spain and Portugal (Azorin-Molina et al 2016).…”
Section: Frequency Changes Of Global and Regional Swssupporting
confidence: 58%
“…Global sc-PDSI data were downloaded from the Climate Research Unit (CRU), with a spatial resolution of 0.5°, a monthly temporal resolution, and a time span ranging from 1901 to 2020 ( https://crudata.uea.ac.uk/cru/data//drought/#global ) 44 , 45 . We organized the data in annual data by the arithmetic mean, then resampled to 4 km by the nearest neighbor method to match the VCI and TCI data.…”
Section: Methodsmentioning
confidence: 99%
“…It should be noted that the 2020-2021 winter was a very unusual La Niña winter, partly due to the development of sudden stratospheric warming that led to a disruption of the stratospheric polar vortex (Dunn et al, 2022; Lu Seven of the 22 historical Atlantic Niño events followed the spring or winter peak of (+) AMM, while 13 followed the spring or winter peak of (−) AMM, and only two followed AMM-neutral spring or winter (Figure S8k in Supporting Information S1). The (+) AMM develops in conjunction with a decrease in the trade winds in the tropical North Atlantic (Figures S8g-S8i in Supporting Information S1, e.g., Chiang & Vimont, 2004).…”
Section: What Caused the Off-equatorial Westerly Wind Anomalies?mentioning
confidence: 99%