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首页> 外文期刊>Environmental Pollution >Impact of field biomass burning on local pollution and long-range transport of PM_(2.5) in Northeast Asia
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Impact of field biomass burning on local pollution and long-range transport of PM_(2.5) in Northeast Asia

机译：田间生物量燃烧对东北亚局部污染和PM_（2.5）远距离迁移的影响

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摘要

Biomass burning (BB), such as, crop field burning during the post-harvest season, emits large amounts of air pollutants (e.g., PM2.5) that severely impact human health. However, it is challenging to evaluate the impact of BB on PM2.5 due to uncertainties in the size and location of sources as well as their temporal and spatial variability. This study focused on the impacts of BB on local pollution as well as the long-range transport of PM2.5 in Northeast Asia resulting from a huge field BB event in Northeast China during the autumn of 2014. Air quality simulations using the Community Multiscale Air Quality (CMAQ) model were conducted in the year 2014 over the horizontal domains covering Northeast Asia, including the Japanese mainland. In the baseline simulation (Base), field BB emissions were derived from Fire INventory from NCAR (FINN) v1.5 for the year 2014. The model reasonably captured the daily mean PM2.5 mass concentrations, however, it underestimated concentrations in autumn around Northeast China where irregular field BB following the harvest occurred frequently. To address the underestimation of emissions from BB sources in China, another simulation with boosted BB sources from cropland area (FINN20_crop) was conducted in addition to the Base simulation. The model performance of FINN20_crop was significantly improved and showed smaller biases and higher indices of agreement between simulated and observed values in comparison to those of Base. To evaluate long-range transport of PM2.5 from BB sources in China towards Japan, CMAQ with brute-force method (CMAQ/BFM)-estimated BB contributions for Base and FINN20_crop cases were compared with Positive Matrix Factorization (PMF)-estimated BB contributions at Noto Peninsula in Japan. The CMAQ/BFM-estimated contributions from FINN20_crop were in greater agreement with the PMF-estimated contributions. The comparison of BB contributions estimated by the two contrasting models also indicated large underestimations in the current BB emission estimates. (C) 2018 Elsevier Ltd. All rights reserved.
机译：生物质燃烧（BB），例如收获后季节的农田燃烧，会散发大量严重影响人类健康的空气污染物（例如PM2.5）。但是，由于来源的大小和位置以及时间和空间可变性的不确定性，评估BB对PM2.5的影响具有挑战性。这项研究的重点是BB对局部污染的影响以及2014年秋季在中国东北发生的一次大型BB事件导致的东北亚PM2.5的远距离迁移。使用社区多尺度空气进行空气质量模拟质量（CMAQ）模型于2014年在涵盖东北亚（包括日本大陆）的横向域中进行。在基准模拟（基础）中，野外BB排放量来自NCAR（FINN）v1.5的2014年消防清单。该模型合理地捕获了日平均PM2.5质量浓度，但是，它低估了大约秋天的PM2.5质量浓度。东北地区，收割后不规则BB频发。为了解决对中国BB排放物的低估问题，除了进行基础模拟外，还进行了另一次利用农田地区BB排放量增加的模拟（FINN20_crop）。与基础模型相比，FINN20_crop的模型性能得到了显着改善，并显示出较小的偏差和较高的模拟值与实测值之间的一致性。为了评估PM2.5从中国BB来源向日本的远距离迁移，将使用暴力法（CMAQ / BFM）估计的针对基础和FINN20_crop案例的BB贡献与CMAQ与正矩阵分解（PMF）估计的BB进行了比较。在日本能登半岛的捐款。来自FINN20_crop的CMAQ / BFM估算捐款与PMF估算捐款更加一致。通过两个对比模型估算的BB贡献的比较还表明，当前的BB排放估算中存在很大的低估。 （C）2018 Elsevier Ltd.保留所有权利。

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