SLCP co-control approach in East Asia: Tropospheric ozone reduction strategy by simultaneous reduction of NO x /NMVOC and methane

Akimoto, Hajime; Kurokawa, Junichi; Sudo, Kengo; Nagashima, Tatsuya; Takemura, Toshihiko; Klimont, Zbigniew; Amann, Markus; Suzuki, Katsunori

doi:10.1016/j.atmosenv.2015.10.003

Cited by 32 publications

(24 citation statements)

References 40 publications

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“…They said that the rise in methane from May to September was due to rising temperatures during this period. Akimoto et al (2015) in the study of methane changes in East Asia witnessed seasonal changes in methane in their study area, which peaked in August and at least observed in February and March. Ganesan et al (2017) measured India's minimum methane concentration in winter and its peak concentration in August and July.…”

Section: Discussionmentioning

confidence: 99%

Investigation of monthly and seasonal changes of methane gas with respect to climate change using satellite data

2019

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Climate change and global warming are the biggest challenges in the current century. Methane gas is one of the most important greenhouse gases which can contribute to creating warming weather (about 19%). In this research, satellite data from GOSAT and MODIS and also climatic data of precipitation, temperature and humidity are used to analyze monthly and seasonal methane changes in 2012 to 2018 in North America. The results show that the methane gas has increased during this period and it increases from 1789 to 1824 ppb. The gas has monthly fluctuation and in October and September has the maximum concentration and in March and April has the minimum value. The relationship between the methane gas and temperature and LST is positive, and the relationship between the methane gas and NDVI, precipitation and humidity is negative. This verifies that the increase in methane concentration has significant relationship with low vegetation cover and high temperature. Therefore, conservation of vegetation cover can help to reduce the methane concentration.

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Section: Discussionmentioning

confidence: 99%

Investigation of monthly and seasonal changes of methane gas with respect to climate change using satellite data

2019

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“…The MIROC-AGCM fields were nudged toward the 6-hourly ERA-Interim reanalysis (Dee et al, 2011). The emission inventories used were obtained from the emission scenarios for the Greenhouse Gas and Air Pollution Interactions and Synergies (GAINS) model developed by the International Institute for Applied System Analysis (IIASA) (Klimont et al, 2009;Akimoto et al, 2015).…”

Section: Miroc Model Outputmentioning

confidence: 99%

Seasonal and spatial changes in trace gases over megacities from Aura TES observations: two case studies

et al. 2017

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Abstract. The Aura Tropospheric Emission Spectrometer (TES) is collecting closely spaced observations over 19 megacities. The objective is to obtain measurements that will lead to better understanding of the processes affecting air quality in and around these cities, and to better estimates of the seasonal and interannual variability. We explore the TES measurements of ozone, ammonia, methanol and formic acid collected around the Mexico City metropolitan area (MCMA) and in the vicinity of Lagos (Nigeria). The TES data exhibit seasonal signals that are correlated with Atmospheric Infrared Sounder (AIRS) CO and Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical depth (AOD), with in situ measurements in the MCMA and with Goddard Earth Observing System (GEOS)-Chem model output in the Lagos area. TES was able to detect an extreme pollution event in the MCMA on 9 April 2013, which is also evident in the in situ data. TES data also show that biomass burning has a greater impact south of the city than in the caldera where Mexico City is located. TES measured enhanced values of the four species over the Gulf of Guinea south of Lagos. Since it observes many cities from the same platform with the same instrument and applies the same retrieval algorithms, TES data provide a very useful tool for easily comparing air quality measures of two or more cities. We compare the data from the MCMA and Lagos, and show that, while the MCMA has occasional extreme pollution events, Lagos consistently has higher levels of these trace gases.

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“…Tropospheric ozone is a major air pollutant that can damage human skin and lungs, reduce agricultural output, and increase levels of premature mortality [1]. It is also one of the greenhouse gases that lead to a rise in the surface temperature by absorbing long-wave radiation energy at the surface of the Earth and re-releasing the energy [2,3]. Tropospheric ozone can be introduced directly from the stratosphere [4][5][6], or formed via the photochemical reactions of ozone precursors such as methane (CH 4 ), carbon monoxide (CO), nitrogen oxides (NO x ), and volatile organic compounds (VOCs) [7].…”

Section: Introductionmentioning

confidence: 99%

Near-Surface Ozone Variations in East Asia during Boreal Summer

et al. 2020

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This study examined the variability of near-surface (850 hPa) ozone during summer in East Asia using simulations from 12 models participating in the Chemistry-Climate Model Initiative (CCMI). The empirical orthogonal function (EOF) analysis of non-detrended ozone shows that the first (second) EOF mode is characterized by a monopole (dipole) structure that describe 83.3% (7.1%) of total variance. The corresponding the first principle component (PC1) time series exhibits a gradually increasing trend due to the rising anthropogenic emission, whereas PC2 shows interannual variation. To understand the drivers of this interannual variability, the detrended ozone is also analyzed. The two leading EOF patterns of detrended ozone, EOF1 and EOF2, explain 37.0% and 29.2% of the total variance, respectively. The regression results indicate that the positive ozone anomaly in East Asia associated with EOF1 is caused by the combination of net ozone production and transport from the upper atmosphere. In contrast, EOF2 is associated with the weakened western Pacific subtropical high during the La Niña decaying summer, which tends to decrease monsoon precipitation, thus increasing ozone concentration in China. Our results suggest that the El Niño-Southern Oscillation (ENSO) plays a key role in driving interannual variability in tropospheric ozone in East Asia.Atmosphere 2020, 11, 206 2 of 17 in areas where ozone is not generally produced [8]. Ozone is more prevalent at higher altitudes in the troposphere of the mid-latitudes. Therefore, downward motion leads to more surface ozone by the transport of higher ozone air from the upper troposphere. In addition, when stratospheric ozone flows directly into the troposphere because of tropopause folding or the development of a strong low-pressure system, the concentration of ozone also increases in the upper-middle troposphere [15,16]. The interannual variability such as the East Asian monsoon and El Niño-Southern Oscillation (ENSO) can also result in the redistribution of tropospheric ozone [9][10][11]17,18]. For example, the tropical Pacific ozone concentration varies with the location and intensity of the anomalous vertical motions associated with the Walker circulation that is closely tied to ENSO [19][20][21]. Note that if the various factors affecting ozone concentration act in combination, the characteristics of ozone variation will differ significantly from region to region.East Asia has recently undergone a strong trend of increasing ozone [8], which can be associated with the increase in ozone precursor emissions [22,23]. The East Asia is dominated by southerly winds originating from the western North Pacific Ocean during the boreal summer that affect both climate [24] and air quality [17]. Inland regions that are far from the ocean are subjected to active ozone production under strong solar radiation, and because of the increase in excited oxygen atoms (O 1 D) that catalytically destroy ozone [25], the moistened air coming from the ocean results in a decrease of ozone. This may...

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SLCP co-control approach in East Asia: Tropospheric ozone reduction strategy by simultaneous reduction of NO x /NMVOC and methane

Cited by 32 publications

References 40 publications

Investigation of monthly and seasonal changes of methane gas with respect to climate change using satellite data

Investigation of monthly and seasonal changes of methane gas with respect to climate change using satellite data

Seasonal and spatial changes in trace gases over megacities from Aura TES observations: two case studies

Near-Surface Ozone Variations in East Asia during Boreal Summer

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