Reply on RC2 DOI Creative Commons

Liangying Zeng

Published: May 26, 2021

Abstract. El Niño–Southern Oscillation (ENSO), a phenomenon of periodic changes in sea surface temperature the equatorial central-eastern Pacific Ocean, is strongest signal interannual variability climate system with quasi-period 2–7 years. Niño events have been shown to important influences on meteorological conditions China. In this study, impacts different durations aerosol concentrations and haze days during December–January–February (DJF) China are quantitatively examined using state-of-the-art Energy Exascale Earth System Model version 1 (E3SMv1). We find that PM2.5 increased by 1–2 class="inline-formula">µg m−3 northeastern southern decreased up 2.4 relative climatological means. Compared long-duration (LD) events, short duration (SD) but strong intensity causes northerly wind anomalies over China, which favorable for dispersion region. Moreover, anomalous southeasterly winds weaken wintertime prevailing northwesterly facilitate transport from southeast Asia, enhancing increase SD LD events. addition, modulation effect 2–3 times more than The variations mainly controlled accumulation/dispersion due atmospheric circulation, while Niño-induced precipitation change has little effect. occurrence frequency increasing significantly recent decades, especially after 1940s, suggesting exerted an increasingly intense pollution past few decades.

Language: Английский

Distinct Impacts of ENSO on Haze Pollution in the Beijing–Tianjin–Hebei Region between Early and Late Winters DOI
Wei Zhao, Shangfeng Chen,

Hengde Zhang

et al.

Journal of Climate, Journal Year: 2021, Volume and Issue: 35(2), P. 687 - 704

Published: Nov. 10, 2021

Abstract The Beijing–Tianjin–Hebei (BTH) region has encountered increasingly severe and frequent haze pollution during recent decades. This study reveals that El Niño–Southern Oscillation (ENSO) distinctive impacts on interannual variations of over BTH in early late winters. impact ENSO the is strong winter, but weak winter. In ENSO-related sea surface temperature anomalies generate double-cell Walker circulation anomalies, with upward motion tropical central-eastern Pacific Indian Ocean, downward western Pacific. ascending enhanced atmospheric heating Ocean trigger teleconnection propagating from north to East Asia, result generation an anticyclonic anomaly Northeast Asia. associated southerly west side lead more serious via reducing wind speed increasing low-level humidity thermal inversion. contribution formation Asia winter can be confirmed by model numerical experiments. vertical precipitation are related ENSO. As such, cannot induce a clear teleconnection, thus BTH. Further analysis shows stronger ENSO-induced partially due higher mean SST there. Significance Statement There exist large discrepancies regarding events wintertime North China. Several studies have indicated However, some argued exert occurrence this study, we present evidence demonstrate China Specifically, whereas fairly Results could reconcile discrepancy previous about

Language: Английский

Citations

45
Intensified modulation of winter aerosol pollution in China by El Niño with short duration DOI Creative Commons

Liangying Zeng,

Yang Yang, Hailong Wang

et al.

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(13), P. 10745 - 10761

Published: July 15, 2021

Abstract. El Niño–Southern Oscillation (ENSO), a phenomenon of periodic changes in sea surface temperature the equatorial central-eastern Pacific Ocean, is strongest signal interannual variability climate system with quasi-period 2–7 years. Niño events have been shown to important influences on meteorological conditions China. In this study, impacts different durations aerosol concentrations and haze days during December–January–February (DJF) China are quantitatively examined using state-of-the-art Energy Exascale Earth System Model version 1 (E3SMv1). We find that PM2.5 increased by 1–2 µg m−3 northeastern southern decreased up 2.4 relative climatological means. Compared long-duration (LD) events, short duration (SD) but strong intensity causes northerly wind anomalies over China, which favorable for dispersion region. Moreover, anomalous southeasterly winds weaken wintertime prevailing northwesterly facilitate transport from southeast Asia, enhancing increase SD LD events. addition, modulation effect 2–3 times more than The variations mainly controlled accumulation/dispersion due atmospheric circulation, while Niño-induced precipitation change has little effect. occurrence frequency increasing significantly recent decades, especially after 1940s, suggesting exerted an increasingly intense pollution past few decades.

Language: Английский

Citations

30
Dominant synoptic patterns associated with the decay process of PM<sub>2.5</sub> pollution episodes around Beijing DOI Creative Commons
Xiaoyan Wang, Renhe Zhang, Yanke Tan

et al.

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(4), P. 2491 - 2508

Published: Feb. 19, 2021

Abstract. The variation in the concentrations of ambient PM2.5 (particles with an aerodynamic diameter less than 2.5 µm) generally forms a continuous sawtooth cycle recurring smooth increase followed by sharp decrease. episode abrupt decay pollution is mostly meteorological origin and controlled passage synoptic systems. One affordable effective measure for quickly reducing northern China to wait strong wind arrive. However, it still unclear how needs be exactly what kind system most effectively results rapid air episodes. variations over 28 channel cities Beijing region are investigated determine mechanisms which patterns affect processes This work shows more obvious day-to-day concentration winter summer, implies that wintertime sensitive factors. There were 365 from January 2014 March 2020, 97 them related wet deposition. In total, 26 %–43 % pollutant removed deposition different seasons. Two dominant circulation identified summer. All other three seasons have types (CTs), respectively. CTs spring show same as those autumn winter. beneficial all exhibit higher-than-normal surface speed, negative relative humidity anomaly net outflow domain. addition, CT1 spring, northeasterly features significant horizontal pollutants upward spread free atmosphere. CT2 frequent CT winter, highest speed northwest, boundary layer height (BLH) lowest among CTs, favorable reduction concentrations. CT3, vertical shear within enhances mixing pollutants, extra cleaning mechanism besides dry clean mass inflow. decreases 37 %, 41 27 after CT1, A airflow positive BLH main reasons phase process decreasing trend reflecting successful emission mitigation. Emission reductions led 4.3–5.7 µgm-3yr-1 decrease region.

Language: Английский

Citations

29
The differential impact of 2015–2020 El Niño and El Niño Modoki on warm- and cold-season PM2.5 concentration and distribution across China DOI
Wang Xiao-hong,

Jing‐Hao Qin,

Shiyuan Zhong

et al.

Atmospheric Environment, Journal Year: 2023, Volume and Issue: 305, P. 119816 - 119816

Published: April 26, 2023

Language: Английский

Citations

8
Impacts of ENSO on wintertime PM2.5 pollution over China during 2014–2021 DOI Creative Commons

Biyin Xie,

Yang Yang, Pinya Wang

et al.

Atmospheric and Oceanic Science Letters, Journal Year: 2022, Volume and Issue: 15(4), P. 100189 - 100189

Published: Feb. 10, 2022

China has implemented a series of emission reduction policies since 2013, and the concentration air pollutants consequently decreased significantly. However, PM2.5 (particulate matter with an aerodynamic diameter less than 2.5 µm) pollution still occurs in relation to interannual variations meteorological conditions. Considering that El Niño–Southern Oscillation (ENSO) is strongest signal modulating variation atmosphere–ocean system, this study authors investigate concentrations four megacity clusters during winter season associated individual ENSO events from 2014 2021. Results show wintertime Beijing–Tianjin–Hebei Fenwei Plain regions Niño years are higher those La Niña years, which can be explained by anomalous southerly (northerly) winds (La Niña) favoring accumulation (diffusion). In Pearl River Delta region, decrease relative owing enhanced water vapor flux precipitation, removing more atmosphere. The comprehensive effects wind precipitation anomalies lead unpredictability impacts on over Yangtze should analyzed case case. 摘要 2013年以来中国实施了一系列减排政策, 大气污染物浓度明显下降, 但由于气象条件的年际变化, 中国PM2.5 (空气动力学直径小于2.5 µm的颗粒物) 污染仍然存在. 厄尔尼诺–南方涛动 是调节大气–海洋系统年际变化的最强信号. 本文研究了2014–2021年四次ENSO事件期间, 中国四个特大城市群冬季PM2.5浓度的变化. 结果表明, 在京津冀和汾渭平原地区, 由于厄尔尼诺 (拉尼娜) 期间的偏南风 (偏北风) 异常有利于 的积累 (扩散), 冬季PM2.5浓度在厄尔尼诺年高于拉尼娜年. 在珠三角地区, 由于厄尔尼诺冬季水汽通量和降水的增加有利于大气中PM2.5的湿清除, 冬季PM2.5浓度在厄尔尼诺年低于拉尼娜年. 在环流和降水异常的综合作用下, ENSO对长三角地区PM2.5浓度的影响难以预测, 应逐案分析.

Language: Английский

Citations

12
Impact of early winter North Atlantic Oscillation on the dramatic alternation of seesaw haze intensity between late winter months in the North China Plain DOI
Jing Wang, Yanju Liu, Yang Yang

et al.

Atmospheric Research, Journal Year: 2022, Volume and Issue: 281, P. 106483 - 106483

Published: Oct. 29, 2022

Language: Английский

Citations

9
Variability in temperature extremes across the Tibetan Plateau and its non-uniform responses to different ENSO types DOI

Zhiwei Yong,

Zegen Wang, Junnan Xiong

et al.

Climatic Change, Journal Year: 2023, Volume and Issue: 176(7)

Published: June 29, 2023

Language: Английский

Citations

5
Relationship between El Niño-Southern Oscillation and Atmospheric Aerosols in the Legal Amazon DOI Open Access
Augusto Gabriel da Costa Pereira, Rafael da Silva Palácios,

Paula C. R. Santos

et al.

Climate, Journal Year: 2024, Volume and Issue: 12(2), P. 13 - 13

Published: Jan. 23, 2024

The El Niño-Southern Oscillation (ENSO) stands out as the most significant tropical phenomenon in terms of climatic magnitude resulting from ocean–atmosphere interaction. Due to its atmospheric teleconnection mechanism, ENSO influences various environmental variables across distinct scales, potentially impacting spatiotemporal distribution aerosols. Within this context, study aims evaluate relationship between and aerosols entire Legal Amazon during period 2006 2011. Over five-year span, four events were identified. Concurrently, an analysis variability aerosol optical depth (AOD) Black Carbon radiation extinction (EAOD-BC) was conducted alongside these events, utilizing data derived Aerosol Robotic Network (AERONET), MERRA-2 model, ERSSTV5. Employing Windowed Cross-Correlation (WCC) approach, statistically phase lags up 4 6 months indicators observed. There approximate 100% increase AOD immediately after Niño periods, particularly intervals encompassing La Niña phase. specific humidity anomaly (QA) revealed that, contrary expectations, positive values observed throughout period. This result suggests that while there is a suppression precipitation due subsidence drier air masses Amazon, region still exhibits (Q) conditions. interaction intricate. However, Q can exert influence over microphysical properties aerosols, addition affecting their chemical composition load. primarily occurs through water absorption, leading substantial alterations scattering characteristics, thus solar radiation.

Language: Английский

Citations

1
Observational Analysis of Surface Ozone Variability in China from 2015 to 2020: Insights from Consecutive ENSO Episodes DOI
Wang Xiao-hong, Qingheng Lu, Shiyuan Zhong

et al.

Atmospheric Pollution Research, Journal Year: 2024, Volume and Issue: 15(8), P. 102185 - 102185

Published: May 16, 2024

Language: Английский

Citations

1
Interdecadal relationship between the wintertime haze frequency over Beijing and mega‐ENSO DOI Creative Commons
Jing Wang, Yanju Liu, Yihui Ding

et al.

Atmospheric Science Letters, Journal Year: 2020, Volume and Issue: 21(12)

Published: Aug. 17, 2020

Abstract Observational analyses suggest that natural or internal climate variability plays a crucial role in modulating wintertime haze days Beijing (WHD BJ ) on decadal timescales, which may overwhelm the effect of human emissions to some extent. This study links variations WHD mega‐El Niño–Southern Oscillation (ENSO), newly defined ENSO‐related pattern with vaster range variability, timescales. The mega‐ENSO delineates an apparent out‐of‐phase relationship , could be used explain past and recent decreases 1961–1971 1997–2012, as well increase 1972–1996. positive phase can induce high dynamical scavenging efficiency pollutants over area through notable situ low‐level northerly wind anomalies are associated quasi‐barotropic anticyclonic anomaly centered around Lake Baikal, thus reducing frequency vice versa for negative phase. influence interdecadal predictions long‐term occurrence events Beijing. Therefore, it will focused upon future routine operations.

Language: Английский

Citations

10