Now showing items 1-20 of 9441

    • Emerging Anthropogenic Influences on the Southcentral Alaska Temperature and Precipitation Extremes and Related Fires in 2019

      Berman, Matthew; Schmidt, Jennifer; Bhatt, Uma S.; Lader, Rick T.; Walsh, John E.; Bieniek, Peter A.; Thoman, Richard L.; Borries-Strigle, Cecilia; Bulock, Kristi; Chriest, Jonathan; et al. (MDPI, 2021-01-17)
      The late-season extreme fire activity in Southcentral Alaska during 2019 was highly unusual and consequential. Firefighting operations had to be extended by a month in 2019 due to the extreme conditions of hot summer temperature and prolonged drought. The ongoing fires created poor air quality in the region containing most of Alaska’s population, leading to substantial impacts to public health. Suppression costs totaled over $70 million for Southcentral Alaska. This study’s main goals are to place the 2019 season into historical context, provide an attribution analysis, and assess future changes in wildfire risk in the region. The primary tools are meteorological observations and climate model simulations from the NCAR CESM Large Ensemble (LENS). The 2019 fire season in Southcentral Alaska included the hottest and driest June–August season over the 1979–2019 period. The LENS simulation analysis suggests that the anthropogenic signal of increased fire risk had not yet emerged in 2019 because of the CESM’s internal variability, but that the anthropogenic signal will emerge by the 2040–2080 period. The effect of warming temperatures dominates the effect of enhanced precipitation in the trend towards increased fire risk.
    • DUST PALLIATIVE MEAN PARTICLE RESIDENCE TIME CALCULATOR

      Metzgar, Jonathan (2020-12-31)
      Previous research efforts at UAF have established that dust palliative performance may be compared using a calculation called the mean particle residence time (tau, or MPRT). The MPRT value is computed using linear regression techniques to determine the time when the dust palliative loses its effectiveness. A technician tests the palliative using a dustfall column and a nephelometer to measure the concentration of PM10 over time. The technician needs to manually process this raw data with an Excel spreadsheet making dust palliative MPRT reports time-consuming and prone to error. Finally, the certifying technician prints and files the report for future reference which limits future dissemination. We developed a web-based calculator, called UAFDUST, to automate the process of producing the MPRT report. UAFDUST combines a web app front end using Google's Angular library with a PHP and SQL database backend. This database enables a laboratory to record metadata about the dust palliative including the dustfall column testing date and technician, certification date, and certifying technician. The app calculates the MPRT and produces accompanying linear regression plots. The UAFDUST app stores dust palliative MPRT tests in a public database and trained laboratory technicians may contribute new data.
    • Northern Light, volume 3, number 1

      Union of Students, University of Alaska Anchorage, 1990-09-17
    • Northern Light, volume 5, number 22

      Union of Students, University of Alaska Anchorage, 1993-04-13
    • Northern Light, December 6, 1999

      Union of Students, University of Alaska Anchorage, 1999-12-06
    • Northern Light, November 23, 1999

      Union of Students, University of Alaska Anchorage, 1999-11-23
    • Northern Light, November 15, 1999

      Union of Students, University of Alaska Anchorage, 1999-11-15
    • Northern Light, November 8, 1999

      Union of Students, University of Alaska Anchorage, 1999-11-08
    • Northern Light, November 1, 1999

      Union of Students, University of Alaska Anchorage, 1999-11-01
    • Northern Light, October 25, 1999

      Union of Students, University of Alaska Anchorage, 1999-10-25
    • Northern Light, October 18, 1999

      Union of Students, University of Alaska Anchorage, 1999-10-18
    • Northern Light, October 11, 1999

      Union of Students, University of Alaska Anchorage, 1999-10-11
    • Northern Light, October 4, 1999

      Union of Students, University of Alaska Anchorage, 1999-10-04
    • Northern Light, September 27, 1999

      Union of Students, University of Alaska Anchorage, 1999-09-27
    • Northern Light, September 20, 1999

      Union of Students, University of Alaska Anchorage, 1999-09-20
    • Northern Light, September 13, 1999

      Union of Students, University of Alaska Anchorage, 1999-09-13
    • Northern Light, August 23, 1999

      Union of Students, University of Alaska Anchorage, 1999-04-23
    • Northern Light, July 20, 1999

      Union of Students, University of Alaska Anchorage, 1999-07-20
    • Northern Light, July 12, 1999

      Union of Students, University of Alaska Anchorage, 1999-07-12
    • Northern Light, June 28, 1999

      Union of Students, University of Alaska Anchorage, 1999-06-28