Reconstructing Summer Upper-Level Flow In The Northern Rocky Mountains Using An Alpine Larch (Larix Lyallii) Tree-Ring Chronology
Mid-latitude mesoscale weather in the climatological summer is heavily influenced by fluctuations in synoptic-scale circulation patterns. Previous research has linked Arctic amplification to alterations in summer synoptic climatology, leading to more extreme weather events in the mid-latitudes. In t...
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ftunivnorthcag:oai:libres.uncg.edu/22922 2024-09-30T14:31:14+00:00 Reconstructing Summer Upper-Level Flow In The Northern Rocky Mountains Using An Alpine Larch (Larix Lyallii) Tree-Ring Chronology Montpellier, Evan E. NC DOCKS at Appalachian State University 2018 http://libres.uncg.edu/ir/asu/f/Montpellier_Evan_2018_Thesis.pdf English eng http://libres.uncg.edu/ir/asu/f/Montpellier_Evan_2018_Thesis.pdf 2018 ftunivnorthcag 2024-09-17T15:09:14Z Mid-latitude mesoscale weather in the climatological summer is heavily influenced by fluctuations in synoptic-scale circulation patterns. Previous research has linked Arctic amplification to alterations in summer synoptic climatology, leading to more extreme weather events in the mid-latitudes. In this study we reconstruct seasonal (JJA) upper-level (500 hPa) atmospheric flow for four geographic locations in the mid-latitudes using an alpine larch (Larix lyallii Parl.) tree-ring chronology derived from western Montana. Our goal is to assess the long-term (400+ year) stability of upper-level flow to place the observed trends in a historical context. Spatial pattern correlations indicate that tree growth increases when meridional flow and zonal flow are strong west (r = 0.504, p = 0.001, n = 37) and north (r = 0.642, p < 0.001, n = 37) of the study site, respectively. Tree growth declines when meridional flow and zonal flow are strong east (r = -0.497, p = 0.001, n = 37) and south (r = -0.584, p < 0.001, n = 37) of the study site, respectively. Our 444-year climate reconstructions of 500 hPa flow show that ridging is becoming more intense in recent decades while troughs are declining in intensity. Other/Unknown Material Arctic University of North Carolina: NC DOCKS (Digital Online Collection of Knowledge and Scholarship) Arctic |
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Open Polar |
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University of North Carolina: NC DOCKS (Digital Online Collection of Knowledge and Scholarship) |
op_collection_id |
ftunivnorthcag |
language |
English |
description |
Mid-latitude mesoscale weather in the climatological summer is heavily influenced by fluctuations in synoptic-scale circulation patterns. Previous research has linked Arctic amplification to alterations in summer synoptic climatology, leading to more extreme weather events in the mid-latitudes. In this study we reconstruct seasonal (JJA) upper-level (500 hPa) atmospheric flow for four geographic locations in the mid-latitudes using an alpine larch (Larix lyallii Parl.) tree-ring chronology derived from western Montana. Our goal is to assess the long-term (400+ year) stability of upper-level flow to place the observed trends in a historical context. Spatial pattern correlations indicate that tree growth increases when meridional flow and zonal flow are strong west (r = 0.504, p = 0.001, n = 37) and north (r = 0.642, p < 0.001, n = 37) of the study site, respectively. Tree growth declines when meridional flow and zonal flow are strong east (r = -0.497, p = 0.001, n = 37) and south (r = -0.584, p < 0.001, n = 37) of the study site, respectively. Our 444-year climate reconstructions of 500 hPa flow show that ridging is becoming more intense in recent decades while troughs are declining in intensity. |
author |
Montpellier, Evan E. NC DOCKS at Appalachian State University |
spellingShingle |
Montpellier, Evan E. NC DOCKS at Appalachian State University Reconstructing Summer Upper-Level Flow In The Northern Rocky Mountains Using An Alpine Larch (Larix Lyallii) Tree-Ring Chronology |
author_facet |
Montpellier, Evan E. NC DOCKS at Appalachian State University |
author_sort |
Montpellier, Evan E. |
title |
Reconstructing Summer Upper-Level Flow In The Northern Rocky Mountains Using An Alpine Larch (Larix Lyallii) Tree-Ring Chronology |
title_short |
Reconstructing Summer Upper-Level Flow In The Northern Rocky Mountains Using An Alpine Larch (Larix Lyallii) Tree-Ring Chronology |
title_full |
Reconstructing Summer Upper-Level Flow In The Northern Rocky Mountains Using An Alpine Larch (Larix Lyallii) Tree-Ring Chronology |
title_fullStr |
Reconstructing Summer Upper-Level Flow In The Northern Rocky Mountains Using An Alpine Larch (Larix Lyallii) Tree-Ring Chronology |
title_full_unstemmed |
Reconstructing Summer Upper-Level Flow In The Northern Rocky Mountains Using An Alpine Larch (Larix Lyallii) Tree-Ring Chronology |
title_sort |
reconstructing summer upper-level flow in the northern rocky mountains using an alpine larch (larix lyallii) tree-ring chronology |
publishDate |
2018 |
url |
http://libres.uncg.edu/ir/asu/f/Montpellier_Evan_2018_Thesis.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://libres.uncg.edu/ir/asu/f/Montpellier_Evan_2018_Thesis.pdf |
_version_ |
1811635866033979392 |