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Over the past four decades, annual area burned has increased significantly in California and across the western USA. This trend reflects a confluence of intersecting factors that affect wildfire regimes. It is correlated with increasing temperatures and atmospheric vapour pressure deficit. Anthropogenic climate change is the driver behind much of this change, in addition to influencing other climate-related factors, such as compression of the winter wet season. These climatic trends and associated increases in fire activity are projected to continue into the future. Additionally, factors related to the suppression of the Indigenous use of fire, aggressive fire suppression and, in some cases, changes in logging practices...
Categories: Publication; Types: Citation
Originally, we had two primary objectives for this project: (1) To study North Pacific Jet (NPJ) climatology on interannual to decadal time scales by (a) extending the instrumental NPJ period back in time based on Twentieth Century Re-analysis data and (b) by developing a tree-ring based reconstruction of the winter NPJ position. (2). To analyze the influence of NPJ position on Sierra Nevada (SN) fire regimes. For this purpose, we planned to use historical SN fire regime data to establish a pre-settlement NPJ-fire relationship and recent annual area burned data to determine whether this relationship persists into the 21st century. We have reached objective 1a in a study of twentieth century NPJ climatology (Belmecheri...
Categories: Publication; Types: Citation
Abstract (from Dendrochronologia): In the United States’ (US) Northern Rockies, synoptic pressure systems and atmospheric circulation drive interannual variation in seasonal temperature and precipitation. The radial growth of high-elevation trees in this semi-arid region captures this temperature and precipitation variability and provides long time series to contextualize instrumental-era variability in synoptic-scale climate patterns. Such variability in climate patterns can trigger extreme climate events, such as droughts, floods, and forest fires, which have a damaging impact on human and natural systems. We developed 11 tree-ring width (TRW) chronologies from multiple species and sites to investigate the seasonal...
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Regional- to continental-scale paleoclimate syntheses of temperature and hydroclimate in North America are essential for understanding long-term spatiotemporal variability in climate, and for properly assessing risk on decadal and longer timescales. However, existing syntheses rely almost exclusively on tree-ring records, which are known to underestimate low-frequency variability and rarely extend beyond the last millennium. Meanwhile, many additional records from a variety of archives are available and hold the potential of broadening and enhancing our understanding of past climate in North America over the past two thousand years. We propose to bring together a diverse group of with expertise that spans the relevant...