Quantifying Long‐Term Seasonal and Regional Impacts of North American Fire Activity on Continental Boundary Layer Aerosols and Cloud Condensation Nuclei
Quantifying Long‐Term Seasonal and Regional Impacts of North American Fire Activity on Continental Boundary Layer Aerosols and Cloud Condensation Nuclei
复制标题
量化北美火灾活动对大陆边界层气溶胶和云凝结核的长期季节性和区域影响
DOI：
10.1029/2020ea001113
复制
发表时间：
2020-11
影响因子：
3.1
通讯作者：
T. Logan;Xiquan Dong;B. Xi;Xiaojian Zheng;Yuanzu Wang;Peng Wu;Eleanor Marlow;James Maddux
中科院分区：
文献类型：
--
作者：
T. Logan;Xiquan Dong;B. Xi;Xiaojian Zheng;Yuanzu Wang;Peng Wu;Eleanor Marlow;James Maddux
气溶胶输送的深入了解对于减少气溶胶对云发展影响的不确定性至关重要。来自美国能源部（DOE）南部大平原地区大气辐射测量平台（ARM-SGP）和美国国家航空航天局（NASA）现代研究和应用回顾分析第2版（MERRA-2）的数据集，显示在春季和夏季的气溶胶负荷和总碳浓度的季节性增加（2008-2016年），这归因于北美境内的火灾活动和烟雾输送。月平均MERRA-2表面碳质气溶胶质量浓度和ARM-SGP总碳产物具有强相关性（R = 0.82，p < 0.01），沿着与ARM-SGP云凝结核（NCCN）产物的中度相关性（0.5，p ~ 0.1）。月平均ARM-SGP总碳和NCCN产品密切相关（0.7，p ~ 0.01）。来自国家跨部门消防中心（NIFC）的表示火灾数量和覆盖范围的额外产品显示，在1981-2016年温暖季节（3月至9月）期间，MERRA-2碳质产品（0.45，p < 0.01）具有中度相关性。在气象条件方面，由于北美火灾的频率、强度和数量的变化，NIFC火灾产品和MERRA-2 850-hPa等压高度异常之间的相关性较低（0.26，p ~ 0.13）。在过去十年中，观测到的等压面高度异常增加可能导致频繁的天气脊和更干燥的条件与更多的火灾，从而可能影响云/降水过程和降低空气质量。
An intimate knowledge of aerosol transport is essential in reducing the uncertainty of the impacts of aerosols on cloud development. Data sets from the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement platform in the Southern Great Plains region (ARM‐SGP) and the National Aeronautics and Space Administration (NASA) Modern‐Era Retrospective Analysis for Research and Applications, version 2 (MERRA‐2), showed seasonal increases in aerosol loading and total carbon concentration during the spring and summer months (2008–2016) which was attributed to fire activity and smoke transport within North America. The monthly mean MERRA‐2 surface carbonaceous aerosol mass concentration and ARM‐SGP total carbon products were strongly correlated (R = 0.82, p < 0.01) along with a moderate correlation with the ARM‐SGP cloud condensation nuclei (NCCN) product (0.5, p ~ 0.1). The monthly mean ARM‐SGP total carbon and NCCN products were strongly correlated (0.7, p ~ 0.01). An additional product denoting fire number and coverage taken from the National Interagency Fire Center (NIFC) showed a moderate correlation with the MERRA‐2 carbonaceous product (0.45, p < 0.01) during the 1981–2016 warm season months (March–September). With respect to meteorological conditions, the correlation between the NIFC fire product and MERRA‐2 850‐hPa isobaric height anomalies was lower (0.26, p ~ 0.13) due to the variability in the frequency, intensity, and number of fires in North America. An observed increase in the isobaric height anomaly during the past decade may lead to frequent synoptic ridging and drier conditions with more fires, thereby potentially impacting cloud/precipitation processes and decreasing air quality.