Elevated heat pump effects of dust aerosol over Northwestern China during summer

Tang, Yue; Han, Yongxiang; Ma, Xiaoyan; Liu, Zhaohuan

doi:10.1016/j.atmosres.2017.12.004

Cited by 25 publications

(9 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All sector BCs emitted in the region from northeast India to the southern slope of the QTP have induced a consistent circulation change, with convergence and upward motion anomalies, which may further adjust the circulations in East Asia to different extents. This finding is also presented in Sun et al (2012), Jiang et al (2017) and Tang et al (2018). In East Asia, which are possibly affected by local BCs, the climate anomalies due to different sector BCs show less consistency.…”

Section: Brief Discussionmentioning

confidence: 52%

The direct effects of black carbon aerosols from different source sectors in East Asia in summer

Zhuang

Chen

et al. 2019

Clim Dyn

View full text Add to dashboard Cite

Black carbon (BC) aerosol is a significant, short-lived climate forcing agent. To further understand the effects of BCs on the regional climate, the warming effects of BCs from residential, industrial, power and transportation emissions are investigated in Asian regions during summer using the state-of-the-art regional climate model RegCM4. BC emissions from these four sectors have very different rates and variations. Residential and industrial BCs account for approximately 85% of total BC emissions, while power BCs account for only approximately 0.19% in Asian regions during summer. An investigation suggests that both the BC aerosol optical depth (AOD) and direct radiative forcing (DRF) are highly dependent on emissions, while the climate effects show substantial nonlinearity to emissions. The total BCs AOD and clear-sky top of the atmosphere DRF averaged over East Asia (100-130°E, 20-50°N) are 0.02 and + 1.34 W/m 2 , respectively, during summer. Each sector's BC emissions may result in a warming effect over the region, leading to an enhanced summer monsoon circulation and a subsequent local decrease (e.g., northeast China) or increase (e.g., south China) in rainfall in China and its surrounding regions. The near surface air temperature increased by 0.2 K, and the precipitation decreased by approximately 0.01 mm/day in east China due to the total BC emissions. The regional responses to the BC warming effects are highly nonlinear to the emissions, which may be linked to the influences of the perturbed atmospheric circulations and climate feedback. The nonuniformity of the spatial distribution of BC emissions may also have significant influences on climate responses, especially in south and east China. The results of this study could aid us in better understanding BC effects under different emission conditions and provide a scientific reference for developing a better BC reduction strategy over Asian regions.

show abstract

Section: Brief Discussionmentioning

confidence: 52%

The direct effects of black carbon aerosols from different source sectors in East Asia in summer

Zhuang

Chen

et al. 2019

Clim Dyn

View full text Add to dashboard Cite

show abstract

“…These EALs are remarkably related to the strengthened atmospheric convection during summer (Sun et al, ). Moreover, EALs during summer in Northern and Northwest China are dominated by dust (above 90%) from prevailing dust storms (Huang et al, ; Tang et al, ). Unlike the meteorological conditions during summer, those during winter are not conducive to the formation of EALs because atmospheric convection is weak during winter.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Atmospheric Stability by Anomalous Elevated Aerosols During Winter in China

Mao

Pan

et al. 2020

JGR Atmospheres

View full text Add to dashboard Cite

Changes in anthropogenic aerosols with a low level of scientific cognition affect the atmospheric environment and radiative balance of the Earth. We determine anomalous elevated aerosol layers (EALs) and their source and effects on regional atmospheric stability in China by using 2007–2016 data from multiple satellite observations and models. Anomalous EALs occur during winter over Eastern China, and they are mainly distributed above 2 km and can even spread up to 4–5 km despite the disadvantageous atmospheric convection conditions during winter. Anthropogenic pollutants that mainly originate from local‐range transport with enhanced atmospheric updraft play a dominant role (about 60%) in this situation. Furthermore, anomalous EALs result in considerable warming in the upper atmosphere (+0.32 K/day) and cooling on the surface (−0.04 K/day) over Eastern China. They decrease surface incident radiation by an average of 3.4 W/m2. The opposite heating rate change in the upper atmosphere and surface caused by anomalous EALs consequently increases the low atmospheric stability by an average of 0.39 K, and this increment weakens the dissipation of atmospheric dispersion. Related studies have indicated that increased atmospheric stability can severely exacerbate atmospheric pollution near the surface.

show abstract

“…Dust aerosols can affect the solar and infrared radiation budgets at the top of atmosphere (TOA) and at the surface, which in turn influences the regional climate through the dust direct (DRF) and dust-in-snow radiative forcings. Previous studies have revealed an importance of dust DRF on global energy balance in general circulation models (GCMs) in recent decades (Tegen and Lacis, 1996;Miller and Tegen, 1998;Yue et al, 2009;Zhang et al, 2010;Mahowald et al, 2014). As summarized by Kok et al (2017), it was shown that the global average dust DRF was almost −0.4 W m −2 in the current GCMs of Huneeus et al (2011).…”

Section: Introductionmentioning

confidence: 96%

Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle

et al. 2020

View full text Add to dashboard Cite

Abstract. Previous observational evidence and numerical simulations have revealed that the surface sensible heating in spring (March–April–May, MAM) over the Tibetan Plateau (TPSH) can affect the Asian regional hydrological cycle, surface energy balance, and climate through altering atmospheric heat source of the Tibetan Plateau (TP). This study aims to investigate the impacts of MAM TPSH on the interannual variability of East Asian dust cycle by using CAM4-BAM (version 4 of the Community Atmosphere Model coupled to a bulk aerosol model), MERRA-2 (version 2 of the Modern-Era Retrospective analysis for Research and Applications) surface dust concentration, and TPSH measurements. Our simulations show that the surface dust concentrations over the East Asian (EA) dust source region and over the northwestern Pacific (NP) in MAM are significantly positively correlated with TPSH, with regionally averaged correlation coefficients of 0.49 for EA and 0.44 for NP. Similar positive correlations are also shown between the MAM TPSH measurements averaged over the 73 observation sites and the surface dust concentration from MERRA-2. Simulation-based comparisons between strongest and weakest TPSH years reveal that, the MAM surface dust concentration in the strongest TPSH years increases with relative differences of 13.1 % over EA and 36.9 % over NP. These corresponding differences are found in MERRA-2 with 22.9 % and 13.3 % over EA and NP, respectively. Further simulated results show that the processes of whole dust cycles (e.g., dust loading, emission, and transport, as well as dust deposition) are also significantly enhanced during the strongest TPSH years over EA and NP. Through enhancing the TP heat source, stronger TPSH in MAM generates an anticyclonic anomaly in middle and upper troposphere over the TP and over the downstream Pacific region, respectively. These atmospheric circulation anomalies induced by the increased TPSH result in increasing the westerly winds over both EA and NP, which in turn increases dust emissions over the dust source, and dust transport over these two regions, as well as the regional dust cycles. These results suggest that addressing the East Asian dust changes in the future climates requires considering not only increasing greenhouse gas emissions but also the variations of the TP's heat source under global warming.

show abstract

Elevated heat pump effects of dust aerosol over Northwestern China during summer

Cited by 25 publications

References 48 publications

The direct effects of black carbon aerosols from different source sectors in East Asia in summer

The direct effects of black carbon aerosols from different source sectors in East Asia in summer

Enhancement of Atmospheric Stability by Anomalous Elevated Aerosols During Winter in China

Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle

Contact Info

Product

Resources

About