Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA.
University of Colorado, Boulder, CO, USA.
Nat Commun. 2022 Apr 19;13(1):2043. doi: 10.1038/s41467-022-29623-8.
Rising emissions from wildfires over recent decades in the Pacific Northwest are known to counteract the reductions in human-produced aerosol pollution over North America. Since amplified Pacific Northwest wildfires are predicted under accelerating climate change, it is essential to understand both local and transported contributions to air pollution in North America. Here, we find corresponding increases for carbon monoxide emitted from the Pacific Northwest wildfires and observe significant impacts on both local and down-wind air pollution. Between 2002 and 2018, the Pacific Northwest atmospheric carbon monoxide abundance increased in August, while other months showed decreasing carbon monoxide, so modifying the seasonal pattern. These seasonal pattern changes extend over large regions of North America, to the Central USA and Northeast North America regions, indicating that transported wildfire pollution could potentially impact the health of millions of people.
近年来，太平洋西北地区野火排放的增加，被认为抵消了北美地区人为气溶胶污染的减少。由于预计在加速的气候变化下，太平洋西北地区的野火会加剧，因此了解北美地区的本地和传输贡献对于空气污染至关重要。在这里，我们发现从太平洋西北地区野火中排放的一氧化碳相应增加，并观察到对本地和下风区空气污染的重大影响。在 2002 年至 2018 年期间，太平洋西北地区大气中一氧化碳的丰度在 8 月增加，而其他月份则显示出一氧化碳减少，从而改变了季节性模式。这些季节性模式变化延伸到北美的广大地区，包括美国中部和东北地区，表明传输的野火污染可能会对数百万人的健康产生影响。
