Correcting Black Carbon Absorption Measurements with Micro-aethalometer Model 200: Insights from Comparative Analysis

IF 1.5 4区 地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES 热带气象学报 Pub Date : 2023-12-01 DOI:10.3724/j.1006-8775.2023.030
Wei-lun Zhao, Chun-sheng Zhao
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Abstract

: Black carbon (BC) is the strongest visible-light-absorbing aerosol component in the atmosphere, with a significant impact on Earth’s radiative budget. Accurate measurement of BC light absorption is crucial for estimating its radiative effect. The micro-aethalometer model 200 (MA200) by AethLabs, USA, offers high-time-resolution measurement of the multi-wavelength absorption coefficient ( σ ab ) within 1 s, making it widely used in aerial measurement due to its compact size and light weight. However, the reliability of the measured σ ab has not been extensively studied in previous research. In this study, we evaluate the performance of MA200 by comparing σ ab measurements obtained from MA200 with those from the aethalometer model 33 (AE33) by Magee, USA. Our results revealed a significant variation in the determinant coefficient ( R 2 ) between σ ab measurements from MA200 and AE33, depending on the time resolution. The R 2 increases from 0.1 to 0.5 and further to 0.97 as the time resolution of σ ab increases from 1 s to 30 s and 60 s, respectively. We recommend a minimum time resolution of 30 s for stable σ ab measurements using MA200. Moreover, we determine σ ab from attenuation coefficient ( σ ATN ) measured by MA200 as σ ab = ( σ ATN – σ 0 )/ C MA , where σ 0 ranges from – 15.3 Mm –1 to – 6.4 Mm –1 and C MA ranges from 2.65 to 3.21. Correcting the measured σ ab based on the findings of this study can provide reliable results for estimating the radiative effects of BC.
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用 200 型微测速仪校正黑碳吸收测量结果:对比分析的启示
:黑碳(BC)是大气中吸收可见光最强的气溶胶成分,对地球的辐射预算有重大影响。准确测量黑碳的光吸收对估计其辐射效应至关重要。美国 AethLabs 公司的微型大气吸收仪 200 型(MA200)可在 1 秒内对多波长吸收系数(σ ab)进行高时间分辨率测量,因其体积小、重量轻而广泛应用于航空测量。然而,以往的研究并未对测量到的σ ab 的可靠性进行广泛研究。在本研究中,我们通过比较 MA200 与美国 Magee 公司的 33 型(AE33)气压计的 σ ab 测量值来评估 MA200 的性能。结果表明,根据时间分辨率的不同,MA200 和 AE33 σ ab 测量值之间的行列式系数 ( R 2 ) 有很大差异。当 σ ab 的时间分辨率分别从 1 秒增加到 30 秒和 60 秒时,R 2 分别从 0.1 增加到 0.5,并进一步增加到 0.97。我们建议使用 MA200 进行稳定的 σ ab 测量时,最小时间分辨率为 30 秒。此外,我们根据 MA200 测得的衰减系数 ( σ ATN ) 确定 σ ab,即 σ ab = ( σ ATN - σ 0 )/ C MA,其中 σ 0 的范围为 - 15.3 Mm -1 至 - 6.4 Mm -1,C MA 的范围为 2.65 至 3.21。根据这项研究的结果对测量的 σ ab 进行校正,可以为估计 BC 的辐射效应提供可靠的结果。
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来源期刊
热带气象学报
热带气象学报 METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
1.80
自引率
8.30%
发文量
2793
审稿时长
6-12 weeks
期刊介绍: Information not localized
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