Impacts of radiative effect of pre-monsoon biomass burning aerosols on atmospheric circulation and rainfall over Southeast Asia and southern China

Yang, Shulan; Lau, William K. M.; Ji, Zhenming; Dong, Wenjie; Yang, Song

doi:10.1007/s00382-021-06135-7

Cited by 13 publications

(16 citation statements)

References 81 publications

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“…Enhanced precipitation occurred in the western and northern SCS, East China Sea, and their coastal regions, under southerly wind anomalies. These simulated changes in rainfall and circulation induced by March BB aerosols agree well with the results based on climate models (Lee et al, 2014;Chavan et al, 2021) and mesoscale weather models (Wang et al, 2021;Yang et al, 2022b). As in the observations (Fig.…”

Section: Effects Of Bb Aerosolssupporting

confidence: 89%

“…The maximum magnitude of the negative SW radiative flux anomalies is about 60 W m -2 in the northern ICP. The above BB aerosol-induced SW radiative forcing both in the atmosphere and at the surface are comparable in magnitudes to those found previously (Lin et al, 2014;Pani et al, 2018;Yang et al, 2022b). At the TOA, the positive all-sky SW radiative flux anomalies induced by BB aerosols are above 15 W m -2 over North Vietnam, southern China and the SCS but below 7.5 W m -2 over the BB emission source region in the northern ICP (Fig.…”

Section: Instant Effectsupporting

confidence: 86%

“…This might be related to the suppressive effect of BB aerosols on local convection (Hodnebrog et al, 2016;Yang et al, 2022b). The largest rainfall reduction occurred in the northwestern ICP, with a maximum exceeding 2 mm day -1 .…”

Section: Effects Of Bb Aerosolsmentioning

confidence: 97%

“…version 5 (GEOS-5)/AGCM model, Lee et al (2014) suggested that both the direct effect (increasing lower-atmospheric stability) and indirect effect (decelerating cloud droplet autoconversion process) of BB aerosols can suppress local precipitation in the ICP during the pre-monsoon season (March-April), and the large-scale advection of cloud moisture invigorates the downwind rainfall. Yang et al (2022b) utilized the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) to show that the increased atmospheric stability induced by BB aerosols inhibits local rainfall over the ICP. The low-level cyclonic anomaly wind induced by the BB aerosol heating can modify moisture transport, leading to increased (decreased) rainfall over the southern coast (northern inland) of southern China.…”

mentioning

confidence: 99%

“…A case study by Wang et al (2021) revealed that BB aerosols transported from the ICP can suppress convective precipitation and enhance non-convective precipitation over southern China. Most of these studies focused on the seasonal time scale (Lee and Kim, 2010;Lee et al, 2014;Yang et al, 2022b) or individual cases lasting a few days (Wang et al, 2021). However, the BB emission over the ICP has a strong intra-seasonal variability peaking in March (Fig.…”

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confidence: 99%

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Instant and delayed effects of march biomass burning aerosols over the Indochina Peninsula

Zhu

Xu²,

Deng³

et al. 2022

Preprint

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Abstract. Through analyzing observations and simulations from the Weather Research and Forecasting model coupled with Chemistry, we investigated instant and delayed responses of large-scale atmospheric circulations and precipitation to biomass burning (BB) aerosols over the Indochina Peninsula (ICP) in the peak emission of March. The results show that the BB aerosols inhibit precipitation over the ICP in March, and promote precipitation from early-April to mid-April. Specifically, the March BB aerosols over the ICP can induce mid-to-lower tropospheric heating and planetary boundary layer cooling, to enhance local atmospheric stability; meanwhile, the perturbation heating can trigger an anomalous low in the lower troposphere to moisten the mid troposphere. However, the convection suppression due to the stabilized atmosphere dominates over the favorable water-vapor condition induced by large-scale circulation responses, leading to an overall reduced precipitation over the ICP in March. For the delayed effect, the anomalous low can provide more water vapor as the monsoon advances in early-April, although it becomes much weaker without BB aerosols’ strong heating. On the other hand, the convective instability above 850 hPa is enhanced by more water vapor, resulting in enhanced precipitation over the ICP, northern South China Sea, and southern China. Thereafter, the condensational latent heating gradually takes over from the BB aerosol radiative heating, acting as the main driver for maintaining the anomalous circulation and thus the delayed effect in mid-April.

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Section: Effects Of Bb Aerosolssupporting

confidence: 89%

Section: Instant Effectsupporting

confidence: 86%

Section: Effects Of Bb Aerosolsmentioning

confidence: 97%

mentioning

confidence: 99%

mentioning

confidence: 99%

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