Poleward Excursions by the Himalayan Subtropical Jet Over the Past Four Centuries
AffiliationLaboratory of Tree-Ring Research, University of Arizona
MetadataShow full item record
PublisherBlackwell Publishing Ltd
CitationThapa, U. K., St. George, S., & Trouet, V. (2020). Poleward Excursions by the Himalayan Subtropical Jet Over the Past Four Centuries. Geophysical Research Letters, 47(22), e2020GL089631.
JournalGeophysical Research Letters
Rights© 2020. American Geophysical Union. All Rights Reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractSince the 1980s, the subtropical jet stream has generally moved poleward, but its behavior varies by region and season. Here we examine the interannual variability and trends in the latitudinal position of the spring subtropical jet over the Himalayas. During the modern period (1948 to 2018), the spring (March-April-May) jet is typically anchored immediately south of the Himalayas but has rarely (in 1956, 1971, 1984, and 1999) moved poleward to pass over Kyrgyzstan and northwest China. A tree-ring reconstruction of the jet's latitude indicates that such poleward excursions may have become more frequent after 1950, but it is not clear whether that behavior is unprecedented within the past four centuries. These insights into the behavior of the Himalayan subtropical jet may improve seasonal weather forecasts for the region and provide a target for climate simulations to test whether the recent spate of excursions is unusual and due to anthropogenic warming. ©2020. American Geophysical Union. All Rights Reserved.
Note6 month embargo; first published online 29 October 2020
VersionFinal published version
SponsorsNational Science Foundation