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Synoptic-scale circulation patterns during summer derived from tree rings in mid-latitude Asia

Artikel i vetenskaplig tidskrift
Författare Andrea Seim
Johannes Schultz
Caroline Leland
Nicole Davi
Oyunsanaa Byambasuren
Eryuan Liang
Xiaochun Wang
Christoph Beck
Hans Linderholm
Neil Pedersen
Publicerad i Climate Dynamics
Volym 49
Sidor 1917-1931
ISSN 0930-7575
Publiceringsår 2017
Publicerad vid Institutionen för geovetenskaper
Sidor 1917-1931
Språk en
Länkar dx.doi.org/10.1007/s00382-016-3426-...
Ämnesord Atmospheric circulation tree-ring index, Mid-latitude Asia, Objective weather-type classification, Principal component analysis, Synoptic-scale circulation pattern, Tree rings
Ämneskategorier Klimatforskning, Meteorologi och atmosfärforskning

Sammanfattning

Understanding past and recent climate and atmospheric circulation variability is vital for regions that are affected by climate extremes. In mid-latitude Asia, however, the synoptic climatology is complex and not yet fully understood. The aim of this study was to investigate dominant synoptic-scale circulation patterns during the summer season using a multi-species tree-ring width (TRW) network comprising 78 sites from mid-latitude Asia. For each TRW chronology, we calculated an atmospheric circulation tree-ring index (ACTI), based on 1000 hPa geopotential height data, to directly link tree growth to 13 summertime weather types and their associated local climate conditions for the period 1871–1993. Using the ACTI, three groups of similarly responding tree-ring sites can be associated with distinct large-scale atmospheric circulation patterns: 1. growth of drought sensitive trees is positively affected by a cyclone over northern Russia; 2. temperature sensitive trees show positive associations to a cyclone over northwestern Russia and an anticyclone over Mongolia; 3. trees at two high elevation sites show positive relations to a zonal cyclone extending from mid-latitude Eurasia to the West Pacific. The identified synoptic-scale circulation patterns showed spatiotemporal variability in their intensity and position, causing temporally varying climate conditions in mid-latitude Asia. Our results highlight that for regions with less pronounced atmospheric action centers during summer such as the occurrence of large-scale cyclones and anticyclones, synoptic-scale circulation patterns can be extracted and linked to the Northern Hemisphere circulation system. Thus, we provide a new and solid envelope for climate studies covering the past to the future.

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