Impacts of the East Asian Monsoon on springtime dust concentrations over China

Lou, Sijia; Russell, Lynn M.; Yang, Yang; Xu, Li; Lamjiri, Maryam A.; DeFlorio, Michael J.; Miller, Arthur J.; Ghan, Steven J.; Liu, Ying; Singh, Balwinder

doi:10.1002/2016jd024758

Cited by 21 publications

(30 citation statements)

References 92 publications

(132 reference statements)

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“…At present, due to the limitations of the observations and model capability, we could not give a quantitative assessment of the influences of La Niña events on natural aerosols. A recent work reported that the variation of EASM has a significant impact on the dust concentrations over eastern China and highlighted the role of atmospheric circulation for natural aerosols [ Lou et al ., ]. On this point, the possible influences of ENSO on the natural aerosols deserve further consideration…”

Section: Summary and Discussionmentioning

confidence: 99%

Simulated contrasting influences of two La Niña Modoki events on aerosol concentrations over eastern China

Feng

Zhu

et al. 2017

JGR Atmospheres

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Using the Goddard Earth Observing System (GEOS)‐Chem model driven by GEOS‐4 assimilated meteorological data, the potential influence of two La Niña Modoki events on aerosol concentrations over eastern China is explored. The results indicate that the impact of La Niña Modoki on aerosol concentrations differs between strong and moderate events. During the mature phase of the strong event of 1998/1999, an anomalous dipole pattern is observed over eastern China, i.e., with increased aerosol concentrations in the south and reduced concentrations in the north. The dipole pattern in the moderate event of 2000/2001 is reversed, with reduced aerosol concentrations in the south and increased concentrations in north China. Additionally, decreased aerosol concentrations are seen in spring of the decaying phase for the 1998/1999 event, while in the decaying spring of the 2000/2001 event, the dipole is reversed relative to the mature phase. During the decaying summer, aerosol concentrations are found to increase over eastern China in the 1998/1999 event but not in the 2000/2001 event. These anomalous aerosol concentrations are mainly caused by changes in circulation associated with the two La Niña Modoki events. In contrast, the role of wet deposition is observed to be limited during the lifespan of these two events. It is also found that the potential influence of the two La Niña Modoki events on aerosol concentrations can be up to 20% of the climatological mean. This suggests that La Niña Modoki has an important role in determining the distribution of aerosol concentrations over eastern China.

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Section: Summary and Discussionmentioning

confidence: 99%

Simulated contrasting influences of two La Niña Modoki events on aerosol concentrations over eastern China

Feng

Zhu

et al. 2017

JGR Atmospheres

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“…The dust aerosol increases and decreases over the TP as the index weakens and enhances, respectively. Lou et al (2016) also demonstrated a clear negative correlation between the EASM and the dust concentration over eastern China in spring. Based on the variation in the column dust load shown in …”

Section: Relationship Between the Easm And Dust Loading Over The Tpmentioning

confidence: 80%

“…Aerosols, including dust aerosols, have been shown to affect the intensity of the EASM and variations in the EASM can modulate the spatiotemporal distribution of dust aerosols in East Asia. A recent modeling study by Lou et al (2016) indicated that there was a negative correlation between the spring dust loading in eastern China and the East Asian monsoon.…”

Section: Introductionmentioning

confidence: 99%

Direct radiative effects of dust aerosols emitted from the Tibetan Plateau on the East Asian summer monsoon – a regional climate model simulation

2017

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Abstract. While dust aerosols emitted from major Asian sources such as Taklimakan and Gobi deserts have been shown to have strong effect on Asian monsoon and climate, the role of dust emitted from Tibetan Plateau (TP) itself, where aerosols can directly interact with the TP "heat pump" because of their physical proximity both in location and elevation, has not been examined. This study uses the dustcoupled RegCM4.1 regional climate model (RCM) to simulate the spatiotemporal distribution of dust aerosols originating within the TP and their radiative effects on the East Asian summer monsoon (EASM) during both heavy and light dust years. Two 20-year simulations with and without the dust emission from TP showed that direct radiative cooling in the mid-troposphere induced by the TP locally produced dust aerosols resulted in an overall anticyclonic circulation anomaly in the low troposphere centered over the TP region. The northeasterly anomaly in the EASM region reduces its strength considerably. The simulations found a significant negative correlation between the TP column dust load produced by local emissions and the corresponding anomaly in the EASM index (r = −0.46). The locally generated TP dust can cause surface cooling far downstream in Bohai Gulf and the China-North Korea border area through stationary Rossby wave propagation. Although dust from within TP (mainly Qaidam Basin) is a relatively small portion of total Asian aerosols, its impacts on Asian monsoon and climate seems disproportionately large, likely owning to its higher elevation within TP itself.

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“…Meanwhile, East Asia experiences significant monsoon events that are characterized by cold and dry air in winter with northwesterly winds in the lower troposphere and hot and wet air in summer with the reverse winds [ Yang et al ., ]. The effects of the East Asian Monsoon system on dust aerosols has been investigated by a number of previous measurement and modeling studies [ Wu et al ., ; Sun and Liu , ; Lou et al ., ].…”

Section: Introductionmentioning

confidence: 98%

“…This study expands on the work of Lou et al . [], who used CESM to investigate the impacts of the East Asian Monsoon on dust concentrations and its direct radiative forcing in spring and suggested that interannual variations in dust emissions enhance the impact of the East Asian Monsoon on net RF over eastern China by about 40%. However, they did not investigate the impacts of changes in dust emissions on the temperature and precipitation in the region, which is the focus of this study.…”

Section: Introductionmentioning

confidence: 99%

Impacts of interactive dust and its direct radiative forcing on interannual variations of temperature and precipitation in winter over East Asia

et al. 2017

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We used two 150 year preindustrial simulations of the Community Earth System Model, one with interactive dust and the other with prescribed dust, to quantify the impacts of changes in wind during East Asian winter monsoon (EAWM) season on dust emissions, and the resulting consequences for interannual variations of temperature and precipitation over East Asia. The simulated December‐January‐February dust column burden and dust optical depth are lower over northern China in the strongest EAWM years than those of the weakest years by 38.3% and 37.2%, respectively. The decrease in dust over the dust source regions and the downwind region leads to an increase in direct radiative forcing (RF) at the surface by up to 1.5 W m−2. The effects of EAWM‐related variations in surface winds, precipitation, and their effects on dust emissions and wet removal contribute 67% to the total dust‐induced variations of direct RF at the surface and partly offset the cooling that occurs with the EAWM strengthening by heating the surface. The variations of surface air temperature induced by the changes in wind and dust emissions between the strongest and weakest EAWM years (strongest minus weakest) decrease by 0.4–0.6 K from eastern coastal China to Japan, which weakens the impact of EAWM on surface air temperature by 3–18% in these regions. The warming results from the combined effects of changes in direct RF, turbulent heat flux at the surface, and northwesterly wind anomalies that bring cold and dry air from Siberia to these regions. Over eastern coastal China, the variations of large‐scale precipitation induced by the feedback of EAWM‐related changes in wind on dust emissions decrease by 10–30% in winter because of the reduced changes in surface air temperature and the anomalous circulation.

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Impacts of the East Asian Monsoon on springtime dust concentrations over China

Cited by 21 publications

References 92 publications

Simulated contrasting influences of two La Niña Modoki events on aerosol concentrations over eastern China

Simulated contrasting influences of two La Niña Modoki events on aerosol concentrations over eastern China

Direct radiative effects of dust aerosols emitted from the Tibetan Plateau on the East Asian summer monsoon – a regional climate model simulation

Impacts of interactive dust and its direct radiative forcing on interannual variations of temperature and precipitation in winter over East Asia

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