Simulation of tropical tropospheric ozone variation from 1982 to 2010: The meteorological impact of two types of ENSO event

Hou, Xiyong; Zhu, Bin; Fei, Dongdong; Zhu, Xiaoxin; Kang, Hanqing; Wang, Dongdong

doi:10.1002/2016jd024945

Cited by 8 publications

(6 citation statements)

References 69 publications

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“…12b), the interannual variations in the EASM strength are found to be positively correlated with those of ozone and native ozone but negatively correlated with those of South Asian and South-east Asian ozone at the East Asian surface. The positive correlation between the EASM and surface ozone in East Asia was also reported in previous studies (Zhou et al, 2013;Yang et al, 2014;Hou et al, 2015;. Among the three EASM indices, the correlation coefficients are higher for EASM1 and EASM3 than EASM2 (Table S2), indicating that these ozone anomalies correlate closely with shear vorticity during the EASM.…”

Section: Interannual Variations In Foreign Ozone At the East Asian Susupporting

confidence: 85%

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Foreign influences on tropospheric ozone over East Asia through global atmospheric transport

et al. 2019

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Abstract. Tropospheric ozone in East Asia is influenced by the transport of ozone from foreign regions around the world. However, the magnitudes and variations in such influences remain unclear. This study was performed to investigate the influences using a global chemical transport model, GEOS-Chem, through the tagged ozone and emission perturbation simulations. The results show that foreign ozone is transported to East Asia (20–60∘ N, 95–150∘ E) mainly through the middle and upper troposphere. In East Asia, the influence of foreign ozone increases rapidly with altitude. In the middle and upper troposphere, the regional mean concentrations of foreign ozone range from 32 to 65 ppbv, being 0.8–4.8 times higher than its native counterpart (11–18 ppbv). Annually, ∼60 % of foreign ozone in the East Asian middle and upper troposphere comes from North America (5–13 ppbv) and Europe (5–7 ppbv), as well as from foreign oceanic regions (9–21 ppbv). Over the East Asian tropospheric columns, foreign ozone appears most in spring when ozone concentrations in the foreign regions are high and the westerlies are strong and least in summer when the South Asian High blocks eastward foreign ozone from reaching East Asia south of 35∘ N. At the East Asian surface, the annual mean of foreign ozone concentrations is ∼22.2 ppbv, which is comparable to its native counterpart of ∼20.4 ppbv. In the meantime, the annual mean of anthropogenic ozone concentrations from foreign regions is ∼4.7 ppbv, half of which comes from North America (1.3 ppbv) and Europe (1.0 ppbv). Seasonally, foreign ozone concentrations at the East Asian surface are highest in winter (27.1 ppbv) and lowest in summer (16.5 ppbv). This strong seasonality is largely modulated by the East Asian monsoon (EAM) via its influence on vertical motion. The large-scale subsidence prevailing during the East Asian winter monsoon (EAWM) favours the downdraft of foreign ozone to the surface, while widespread convection in the East Asian summer monsoon (EASM) blocks such transport. Interannually, the variation in foreign ozone at the East Asian surface is found to be closely related to the intensity of the EAM. Specifically, the stronger the EAWM is in a winter, the more ozone from North America and Europe reaches the East Asian surface because of the stronger subsidence behind the East Asian trough. In summer, ozone from South and South-east Asia is reduced in strong EASM years due to weakened south-westerly monsoon winds. This study suggests substantial foreign influences on ozone at the East Asian surface and in its tropospheric columns. It also underscores the importance of the EAM in the seasonal and interannual variations in foreign influences on surface ozone in East Asia.

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Section: Interannual Variations In Foreign Ozone At the East Asian Susupporting

confidence: 85%

“…10h). This seasonal migration may be partially related to the variation in ozone production influenced by the EAM (Hou et al, 2015;.…”

Section: Latitudinal and Longitudinal Variations In Foreignmentioning

confidence: 99%

Foreign influences on tropospheric ozone over East Asia through global atmospheric transport

et al. 2019

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“…In the tropical boundary 52 layer there are year-to-year variations in O3 linked to the El Nino-Southern Oscillation (ENSO), 53 which modifies chemical and transport processes, and drives changes in emissions of O3 precursors 54 (e.g. Inness et al, 2015;Hou et al, 2016). However, Ziemke et al (2015) reported that variability in 55 tropical tropospheric O3 is primarily driven by shorter timescale (non-ENSO) phenomena.…”

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confidence: 99%

Influence of Northeast Monsoon cold surges on air quality in Southeast Asia

Ashfold

Latif

Samah

et al. 2017

Atmospheric Environment

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15Ozone (O3) is an important ground-level pollutant. O3 levels and emissions of O3 precursors have 16 increased significantly over recent decades in East Asia and export of this O3 eastward across the 17 Pacific Ocean is well documented. Here we show that East Asian O3 is also transported southward to 18 tropical Southeast (SE) Asia during the Northeast Monsoon (NEM) season (defined as November to 19 February), and that this transport pathway is especially strong during 'cold surges'. Our analysis 20 employs reanalysis data and measurements from surface sites in Peninsular Malaysia, both covering 21 2003-2012, along with trajectory calculations. Using a cold surge index (northerly winds at 925 hPa 22 averaged over 105-110°E, 5°N) to define sub-seasonal strengthening of the NEM winds, we find the 23 largest changes in a region covering much of the Indochinese Peninsular and surrounding seas. Here, 24 the levels of O3 and another key pollutant, carbon monoxide, calculated by the Monitoring 25

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“…Regarding the meteorological impact on the interannual variation of foreign ozone in East Asia, we specifically underscored the importance of EAM, representing an advancement from Y. and Han et al (2018). Future studies can further examine the influences of other prominent climate systems, for instance, the North Atlantic Oscillation (NAO) (Bacer et al, 2016) and the El Niño Southern Oscillation (ENSO) Sudo, 2012, 2014;Hou et al, 2016).…”

Section: Data Availabilitymentioning

confidence: 94%

Foreign influences on tropospheric ozone over East Asia through global atmospheric transport

Han¹,

Liu²,

Yuan³

et al. 2019

Preprint

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<p><strong>Abstract.</strong> Tropospheric ozone in East Asia is influenced by the transport of ozone from foreign regions around the world. However, the magnitudes and variations of such influences remain unclear. This study was performed to investigate this influence and its variations with space and time using a global chemical transport model, GEOS-Chem, for emission zero-out and tagged ozone simulations. The results show that foreign ozone varies significantly with latitude, altitude, and season in the East Asian troposphere. The transport of foreign ozone to East Asia occurs primarily through the middle and upper troposphere, where the concentration of foreign ozone (32&#8211;65&#8201;ppbv) in East Asia is 0.5&#8211;6 times higher than that of native ozone (11&#8211;18&#8201;ppbv) and has strong seasonality, being largest in spring and lowest in winter. Foreign ozone in East Asia increases rapidly with altitude. At the surface, the annual average foreign ozone concentration is ~&#8201;22.2&#8201;ppbv, which is comparable to its native counterpart of ~&#8201;20.4&#8201;ppbv. The annual mean concentration of anthropogenic ozone from foreign regions is ~&#8201;4.7&#8201;ppbv at the East Asian surface, and half of it comes from North America (1.3&#8201;ppbv) and Europe (1.0&#8201;ppbv). The presence of foreign ozone at the East Asian surface is highest in winter (27.1&#8201;ppbv) and lowest in summer (16.5&#8201;ppbv). This strong seasonality is largely modulated by the East Asian monsoon (EAM) via its influence on vertical motion. The large-scale subsidence prevailing during the East Asian winter monsoon (EAWM) favours the downdraft of foreign ozone to the surface, while widespread convection in the East Asian summer monsoon (EASM) blocks such transport. In summer, the South Asian High facilitates the build-up of South Asian ozone in the East Asian upper troposphere and constrains North American, European, and African ozone to the regions north of 35&#176;&#8201;N. The interannual variations of foreign ozone at the East Asian surface have been found to be closely related to the EAM. When the EAWM is strong, North American and European ozone are enhanced at the East Asian surface, as the subsidence behind the East Asian trough becomes stronger. In strong EASM years, South and Southeast Asian ozone is reduced at the East Asian surface due to weakened south-westerly monsoon wind. This study suggests substantial foreign influences on tropospheric ozone in East Asia and underscores the importance of the EAM in the seasonal and interannual variations of foreign influences on surface ozone in East Asia.</p>

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Simulation of tropical tropospheric ozone variation from 1982 to 2010: The meteorological impact of two types of ENSO event

Cited by 8 publications

References 69 publications

Foreign influences on tropospheric ozone over East Asia through global atmospheric transport

Foreign influences on tropospheric ozone over East Asia through global atmospheric transport

Influence of Northeast Monsoon cold surges on air quality in Southeast Asia

Foreign influences on tropospheric ozone over East Asia through global atmospheric transport

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