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 (N_CCN) product (0.5, p ~ 0.1). The monthly mean ARM‐SGP total carbon and N_CCN 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.

中文翻译：

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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性影响

对于减少气溶胶对云发展的影响的不确定性，对气溶胶运输的深入了解至关重要。来自美国能源部（DOE）南部大平原地区（ARM-SGP）和美国国家航空航天局（NASA）的研究与应用现代时代回顾分析版本2（MERRA）的数据集‐2）显示了春季和夏季月份（2008-2016年）的气溶胶负荷和总碳浓度的季节性增加，这归因于北美地区的火灾和烟气运输。每月平均MERRA-2表面碳质气溶胶质量浓度与ARM-SGP总碳产物高度相关（R  = 0.82，p <0.01）连同与ARM-SGP云凝结核（中度相关Ñ _CCN）的产物（0.5，p  〜0.1）。本月平均ARM-SGP总碳和Ñ _CCN产物强烈相关（0.7，p  〜0.01）。在1981-2016年 暖季（3月至9月）期间，从国家机构间消防中心（NIFC）取得的另一种表示火种编号和覆盖率的产品与MERRA-2碳质产品（0.45，p <0.01）呈中等相关性。就气象条件而言，NIFC火产物与MERRA-2 850-hPa等压高度异常之间的相关性较低（0.26，p 〜0.13），原因是北美地区发生火灾的频率，强度和次数存在差异。在过去的十年中，等压高度异常的增加可能导致天气频繁起伏和干燥，并伴有更多火灾，从而潜在地影响云/降水过程并降低空气质量。