The Spatial and Temporal Distributions of Absorbing Aerosols over East Asia

Kang, Litai; Chen, Siyu; Huang, Jianping; Zhao, Shanshan; Ma, Xiaojun; Yuan, Tie; Zhang, Xiaorui; Xie, Tingting

doi:10.3390/rs9101050

Cited by 49 publications

(28 citation statements)

References 110 publications

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“…The highest percent increase in frequency of occurrence is found for equatorial Asia (151.1%, though this is largely due to the very high frequency value in 2015) and East Asia (122.2%) followed by the increase in southern Africa (59.3%) while smaller increases are observed over the southeastern Atlantic Ocean (34.8%). The remarkably strengthened presence of ACA over the East Asia can be assigned to a large degree to the continued consumption of fuels like coal and diesel during 2005-2015 [135]. The increasing frequency of occurrence of ACA over southern Africa during 2005-2015 ( Figure 7i) seems to be in line with the reported increase of burned areas till 2012 [105].…”

Section: Interannual Variabilitysupporting

confidence: 56%

A Climatological Satellite Assessment of Absorbing Carbonaceous Aerosols on a Global Scale

et al. 2019

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A global climatology of absorbing carbonaceous aerosols (ACA) for the period 2005–2015 is obtained by using satellite MODIS (Moderate Resolution Imaging Spectroradiometer)-Aqua and OMI (Ozone Monitoring Instrument)-Aura aerosol optical properties and by applying an algorithm. The algorithm determines the frequency of presence of ACA (black and brown carbon) over the globe at 1° × 1° pixel level and on a daily basis. The results of the algorithm indicate high frequencies of ACA (up to 19 days/month) over world regions with extended biomass burning, such as the tropical forests of southern and central Africa, South America and equatorial Asia, over savannas, cropland areas or boreal forests, as well as over urban and rural areas with intense anthropogenic activities, such as the eastern coast of China or the Indo-Gangetic plain. A clear seasonality of the frequency of occurrence of ACA is evident, with increased values during June–October over southern Africa, during July–November over South America, August–November over Indonesia, November–March over central Africa and November–April over southeastern Asia. The estimated seasonality of ACA is in line with the known annual patterns of worldwide biomass-burning emissions, while other features such as the export of carbonaceous aerosols from southern Africa to the southeastern Atlantic Ocean are also successfully reproduced by the algorithm. The results indicate a noticeable interannual variability and tendencies of ACA over specific world regions during 2005–2015, such as statistically significant increasing frequency of occurrence over southern Africa and eastern Asia.

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Section: Interannual Variabilitysupporting

confidence: 56%

A Climatological Satellite Assessment of Absorbing Carbonaceous Aerosols on a Global Scale

et al. 2019

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“…In this paper, monthly climatologies of aerosol AOD and SSA at Xianghe station are calculated. The regional heterogeneity of aerosol optical properties in China is large and varies with the seasons [47]. The monthly SSA ranges from 0.86 to 0.93.…”

Section: Aerosol Correctionmentioning

confidence: 99%

Validation of OMI HCHO Products Using MAX-DOAS observations from 2010 to 2016 in Xianghe, Beijing: Investigation of the Effects of Aerosols on Satellite Products

Wang

et al. 2019

Remote Sensing

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Formaldehyde (HCHO) is one of the most abundant hydrocarbons in the atmosphere. Its absorption features in the 320–360 nm range allow its concentration in the atmosphere to be retrieved from space. There are two versions of HCHO datasets derived from the Ozone Monitoring Instrument (OMI)—one provided by the Royal Belgian Institute for Space Aeronomy (BIRA-IASB) and one provided by the National Aeronautics and Space Administration (NASA)—referred to as OMI-BIRA and OMI-NASA, respectively. We conducted daily comparisons of OMI-BIRA and multi-axis differential optical absorption spectrometry (MAX-DOAS), OMI-NASA and MAX-DOAS, and OMI-BIRA and OMI-NASA and monthly comparisons of OMI-BIRA and MAX-DOAS and OMI-NASA and MAX-DOAS. Daily comparisons showed a strong impact of effective cloud fraction (eCF), and correlations were better for eCF < 0.1 than for eCF < 0.3. By contrast, the monthly and multi-year monthly mean values yielded correlations of R2 = 0.60 and R2 = 0.95, respectively, for OMI-BIRA and MAX-DOAS, and R2 = 0.45 and R2 = 0.78 for OMI-NASA and MAX-DOAS, respectively. Therefore, use of the monthly mean HCHO datasets is strongly recommended. We conducted a sensitivity test for HCHO air mass factor (AMF) calculations with respect to the HCHO profile, the aerosol extinction coefficient (AEC), the HCHO profile–AEC combination, the aerosol optical depth (AOD), and the single scattering albedo (SSA) to explicitly account for the aerosol optical effects on the HCHO AMF. We found that the combination of AEC and HCHO profiles can account for 23–39% of the HCHO AMF variation. Furthermore, a high load of absorptive aerosols can exert a considerable effect (−53%) on the AMF. Finally, we used the HCHO monthly mean profiles from Goddard Earth Observing System coupled to Chemistry (GEOS-Chem), seasonal mean AECs from Cloud-Aerosol LIDAR with Orthogonal Polarization (CALIOP) and monthly climatologies of AOD and SSA from the OMAERUV (OMI level-2 near UV aerosol data product) dataset at Xianghe station to determine the aerosol correction. The results reveal that aerosols can account for +6.37% to +20.7% of the HCHO monthly change. However, the changes are greatest in winter and are weaker in summer and autumn, indicating that the aerosol correction is more applicable under high-AAOD conditions and that there may be other reasons for the significant underestimation between satellite and MAX-DOAS observations.

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“…However, it shows that AAOD has only about 1% of overlap with the values of AOD (Figure ). Furthermore, emissions of both black carbon and organic carbon, which show a very small magnitude and no trend over the TP region (Kang et al, , fig. 12 therein), together with Figure suggest absorbing aerosols not to be a marked cause of the solar dimming.…”

Section: Resultsmentioning

confidence: 99%

A new perspective on solar dimming over the Tibetan Plateau

Lin

et al. 2018

Intl Journal of Climatology

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Solar radiation changes (dimming/brightening) have recently received growing attention within the research community, although there is currently no generally accepted explanation. This article aims to provide a new perspective for identifying the reasons behind solar dimming/brightening by using long-term measurements of direct and diffuse solar radiation, unlike previous studies which have focused on global solar radiation. We postulate that extinction processes can be more readily revealed by direct and diffuse radiation measurements with the help of a modelling tool that treats the two components separately. An example is presented for Golmud and Lhasa in the northern and southern Tibetan Plateau (TP) respectively, over the period 1957-2013. The following is found: (a) ground-based observed cloud cover alone hardly explains the observed solar dimming at the two sites; (b) both the cloud-free direct radiation transmittivity (τ dir ) and diffuse radiation proportion (p dif ) declined; (c) variations in p dif are overwhelmingly dominated by variations in aerosols, while those in τ dir are related to variations in both aerosol and water vapour; (d) on top of the suggested reduced aerosol concentrations, decreased snow cover can partly explain declined diffuse radiation via lowered surface albedo; (e) the decline in τ dir can be partly attributed to the wetting atmosphere via strengthened absorption; and (f) the impact of volcanic eruptions was also identified from such radiative parameters, lasting into the following summer and especially strong in the southern TP.

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The Spatial and Temporal Distributions of Absorbing Aerosols over East Asia

Cited by 49 publications

References 110 publications

A Climatological Satellite Assessment of Absorbing Carbonaceous Aerosols on a Global Scale

A Climatological Satellite Assessment of Absorbing Carbonaceous Aerosols on a Global Scale

Validation of OMI HCHO Products Using MAX-DOAS observations from 2010 to 2016 in Xianghe, Beijing: Investigation of the Effects of Aerosols on Satellite Products

A new perspective on solar dimming over the Tibetan Plateau

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