Impacts of an aerosol layer on a midlatitude continental system of cumulus clouds: how do these impacts depend on the vertical location of the aerosol layer?

Lee, Seoung Soo; Um, Junshik; Choi, Won Jun; Ha, Kyung‐Ja; Jung, Chang Hoon; Guo, Jianping; Zheng, Youtong

doi:10.5194/acp-23-273-2023

Cited by 2 publications

(1 citation statement)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Notably, aerosols resulting from res, in conjunction with burned biomass materials, contain a substantial amount of carbon, making them effective absorbers of radiation 16 . Consequently, the interaction of re aerosols and radiation affects the thermodynamic and dynamic development of clouds and precipitation 15,[17][18][19][20][21][22][23] . Motivated by this, this study seeks to investigate the impacts of wild res, speci cally through re-produced aerosols, on clouds and precipitation, as they signi cantly in uence global and local energy and hydrologic circulations 24 .…”

Section: Introductionmentioning

confidence: 99%

Seasonal wildfire aerosols in Southeast Asia and Southern China disrupt the Hadley circulation

Lee,

Kim,

Choi

et al. 2024

Preprint

View full text Add to dashboard Cite

The impact of wildfires on the economy, climate, and human health is widely recognized. Some of these consequences are due to the influence on precipitation of fire-generated aerosols, especially in hotspots such as Southeast Asia and the southern part of China. The relatively poor understanding of the role of fire-produced aerosols in precipitation motivates us to study the problem in that part of the globe. We utilize multiyear reanalysis and satellite data, as well as cloud-resolving-model simulations with a 2-km horizontal resolution, over large domains extending 4000–5000 km. This combined analysis shows that fire-induced aerosol concentration anomalies perturb the Hadley circulations, which lead to changes in precipitation not only in the immediate fire vicinity, but also distant areas through teleconnections. In the immediate vicinity of the fires, we see suppressed precipitation that can prolong and intensify the fires, while in contrast, the regions located far from the fire sources experience an enhancement in precipitation. This increase in rainfall can delay deforestation and affect ocean salinity, impacting the ecology, climate and economy in those distant regions. Hence, this study demonstrates that beyond the well-established wind-driven transport of aerosols to remote locations, directly impacting human health and visibility, aerosols from fires have additional strong impacts in remote areas by altering circulations and precipitation patterns.

show abstract

Section: Introductionmentioning

confidence: 99%

Seasonal wildfire aerosols in Southeast Asia and Southern China disrupt the Hadley circulation

Lee,

Kim,

Choi

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

The impacts of dust aerosol and convective available potential energy on precipitation vertical structure in southeastern China as seen from multisource observations

Zhu

Yang

et al. 2023

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. The potential impacts of dust aerosols and atmospheric convective available potential energy (CAPE) on the vertical development of precipitating clouds in southeastern China (20–30∘ N, 110–125∘ E) in June, July, and August from 2000 to 2013 were studied using multisource observations. In southeastern China, heavy-dust conditions are coupled with strong northerly winds that transport air masses containing high concentrations of mineral dust particles, with cold temperatures, and with strong wind shear. This leads to weaker CAPE on dusty days compared with that on pristine days. Based on satellite observations, precipitating drops under dusty conditions grow faster in the middle atmospheric layers (with a temperature of between −5 and +2 ∘C) but slower in the upper and lower layers compared with their pristine counterparts. For a given precipitation top height (PTH), the precipitation rate under dusty conditions is lower in the upper layer but higher in the middle and lower layers. Moreover, the associated latent heating rate released by precipitation in the middle layer is higher. The precipitation top temperature (PTT) shows a fairly good linear relationship with the near-surface rain rate (NSRR): the linear regression slope between the PTT and NSRR is stable under dusty and pristine conditions. However, the PTT0 (the PTT related to rain onset) at the onset of precipitation is highly affected by both the CAPE and aerosol conditions. On pristine days, a stronger CAPE facilitates the vertical development of precipitation and leads to a decrease in PTT0, at a rate of −0.65 ∘C per 100 J kg−1 of CAPE for deep convective precipitation (with a variation of 15 %) and at a rate of −0.41 ∘C per 100 J kg−1 of CAPE for stratiform precipitation (with variation of 12 %). After removing the impacts of CAPE on PTT, dust aerosols led to an increase in PTT0, at a rate of +4.19 ∘C per unit aerosol optical depth (AOD) for deep convective precipitation and at a rate of +0.35 ∘C per unit AOD for stratiform precipitation. This study showed clear evidence that meteorological conditions and aerosol conditions combine to impact the vertical development of precipitation clouds. A quantitative estimation of the sensitivity of PTT to CAPE and dust was also provided.

show abstract

Impacts of an aerosol layer on a midlatitude continental system of cumulus clouds: how do these impacts depend on the vertical location of the aerosol layer?

Cited by 2 publications

References 35 publications

Seasonal wildfire aerosols in Southeast Asia and Southern China disrupt the Hadley circulation

Seasonal wildfire aerosols in Southeast Asia and Southern China disrupt the Hadley circulation

The impacts of dust aerosol and convective available potential energy on precipitation vertical structure in southeastern China as seen from multisource observations

Contact Info

Product

Resources

About