Next Article in Journal
Residual Axial Behavior of Restrained Reinforced Concrete Columns Damaged by a Standard Fire
Previous Article in Journal
Early Smoke Detection Based on Improved YOLO-PCA Network
 
 
Article

Extreme Winds Alter Influence of Fuels and Topography on Megafire Burn Severity in Seasonal Temperate Rainforests under Record Fuel Aridity

1
Department of Environmental Science and Management, Portland State University, Portland, OR 97207, USA
2
Department of Geography, Portland State University, Portland, OR 97207, USA
*
Authors to whom correspondence should be addressed.
Academic Editors: Alistair M. S. Smith and Aaron Sparks
Received: 15 February 2022 / Revised: 15 March 2022 / Accepted: 17 March 2022 / Published: 22 March 2022
Nearly 0.8 million hectares of land were burned in the North American Pacific Northwest (PNW) over two weeks under record-breaking fuel aridity and winds during the extraordinary 2020 fire season, representing a rare example of megafires in forests west of the Cascade Mountains. We quantified the relative influence of weather, vegetation, and topography on patterns of high burn severity (>75% tree mortality) among five synchronous megafires in the western Cascade Mountains. Despite the conventional wisdom in climate-limited fire regimes that regional drivers (e.g., extreme aridity, and synoptic winds) overwhelm local controls on vegetation mortality patterns (e.g., vegetation structure and topography), we hypothesized that local controls remain important influences on burn severity patterns in these rugged forested landscapes. To study these influences, we developed remotely sensed fire extent and burn severity maps for two distinct weather periods, thereby isolating the effect of extreme east winds on drivers of burn severity. Our results confirm that wind was the major driver of the 2020 megafires, but also that both vegetation structure and topography significantly affect burn severity patterns even under extreme fuel aridity and winds. Early-seral forests primarily concentrated on private lands, burned more severely than their older and taller counterparts, over the entire megafire event regardless of topography. Meanwhile, mature stands burned severely only under extreme winds and especially on steeper slopes. Although climate change and land-use legacies may prime temperate rainforests to burn more frequently and at higher severities than has been historically observed, our work suggests that future high-severity megafires are only likely to occur during coinciding periods of heat, fuel aridity, and extreme winds. View Full-Text
Keywords: wildfire; Oregon 2020 fires; Labor Day fires; western Cascades; high-severity fire; climate-limited fire regime wildfire; Oregon 2020 fires; Labor Day fires; western Cascades; high-severity fire; climate-limited fire regime
Show Figures

Figure 1

MDPI and ACS Style

Evers, C.; Holz, A.; Busby, S.; Nielsen-Pincus, M. Extreme Winds Alter Influence of Fuels and Topography on Megafire Burn Severity in Seasonal Temperate Rainforests under Record Fuel Aridity. Fire 2022, 5, 41. https://doi.org/10.3390/fire5020041

AMA Style

Evers C, Holz A, Busby S, Nielsen-Pincus M. Extreme Winds Alter Influence of Fuels and Topography on Megafire Burn Severity in Seasonal Temperate Rainforests under Record Fuel Aridity. Fire. 2022; 5(2):41. https://doi.org/10.3390/fire5020041

Chicago/Turabian Style

Evers, Cody, Andrés Holz, Sebastian Busby, and Max Nielsen-Pincus. 2022. "Extreme Winds Alter Influence of Fuels and Topography on Megafire Burn Severity in Seasonal Temperate Rainforests under Record Fuel Aridity" Fire 5, no. 2: 41. https://doi.org/10.3390/fire5020041

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop