Simulation of the effects of sea-salt aerosols on the structure and precipitation of a developed tropical cyclone

Luo, Huan; Jiang, Baolin; Li, Fangzhou; Lin, Wenshi

doi:10.1016/j.atmosres.2018.10.018

Cited by 11 publications

(12 citation statements)

References 37 publications

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“…Different from the observation, the simulated vortex undergoes a short-period intensification after the model spins up for the first 12 h, and continuously decays from 1800 UTC 1 August. Consistent with the previous studies [22], insignificant diversity of simulated tracks and intensities are shown among these experiments under the effects of different precursor gases penetration as well as the ensembles.…”

Section: Track and Intensitysupporting

confidence: 91%

“…Furthermore, the particular chemical component in the emission would definitely influence the TCs to a certain extent. For example, the higher sea-salt aerosol emission can lead to more latent heat release and increase the horizontal velocity and convective precipitation [22]. Consistently, Hoarau et al [28] reported that the intensity of a TC system will dramatically weaken once the sea-salt emission is excluded, which can be attributed to the activation of interstitial CCN in the inner core.…”

Section: Introductionmentioning

confidence: 91%

“…Although the main effect of aerosols on single deep convection has been better discussed and partially understood, it becomes more complicated and controversial when involving a tropical cyclone (TC). Various factors such as when and where the aerosols intrude into the vortex jointly determine the ultimate effects of anthropogenic aerosols on the track, intensity, structure, and precipitation of TCs [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Most of the studies indicated that aerosols may have a slight effect on TC track [14,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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A Study of the Effects of Anthropogenic Gaseous Emissions on the Microphysical Properties of Landfalling Typhoon Nida (2016) over China

Deng

Duan

2020

Atmosphere

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Using the Weather Research and Forecasting model with chemistry module (WRF-Chem), Typhoon Nida (2016) was simulated to investigate the effects of anthropogenic gaseous emissions on the vortex system. Based on the Multi-resolution Emission Inventory for China (MEIC), three certain experiments were conducted: one with base-level emission intensity (CTRL), one with one-tenth the emission of SO2 (SO2_C), and one with one-tenth the emission of NH3 (NH3_C). Results show that the simulations reasonably reproduced the typhoon’s track and intensity, which were slightly sensitive to the anthropogenic gaseous emissions. When the typhoon was located over the ocean, a prolonged duration of raindrop growth and more precipitation occurred in CTRL run. The strongest updraft in CTRL is attributed to the maximum latent heating through water vapor condensation. During the landfalling period, larger (smaller) differential reflectivities in the main-core of the vortex were produced in NH3_C (SO2_C) run. Such opposite changes of raindrop size distributions may lead to stronger (weaker) rainfall intensity, and the ice-related microphysical processes and the relative humidity in low troposphere were two possible influential factors. Moreover, additional ten-member ensemble results in which white noise perturbations were added to the potential temperature field, indicated that the uncertainty of thermodynamic field in the current numerical model should not be ignored when exploring the impacts of aerosol on the microphysics and TC precipitation.

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Section: Track and Intensitysupporting

confidence: 91%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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A Study of the Effects of Anthropogenic Gaseous Emissions on the Microphysical Properties of Landfalling Typhoon Nida (2016) over China

Deng

Duan

2020

Atmosphere

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“…SSA, which have a broad size distribution and high hygroscopicity, can promote the formation of rain and convective precipitation 9,48 , which may influence the UT/LS water vapour content. Although the response of TC systems to anthropogenic aerosols or dust aerosols has been previously investigated 5,17 .…”

Section: Introductionmentioning

confidence: 99%

Effects of sea salt aerosols on precipitation and upper troposphere/lower stratosphere water vapour in tropical cyclone systems

Jiang

Wang

Shen

et al. 2019

Sci Rep

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The effects of sea salt aerosols (SSA) on cloud microphysical processes, precipitation, and upper troposphere/lower stratosphere water vapour in tropical cyclones were studied with the Weather Research and Forecasting with Chemistry model. Two numerical experiments were conducted: a control experiment (CTL) and an experiment with sea salt emission intensity one-tenth of that in the CTL experiment (CLEAN). Results show increased SSA concentrations, increased production rates of auto-conversion of cloud water to form rain, and increased accretion of cloud water by rain in the CTL experiment, leading to an increase in the precipitation amount. The peak value of precipitation is ~17 mm/h in the CTL experiment and ~13 mm/h in the CLEAN experiment, a difference of ~30%. The CTL experiment has more intense vertical movement in the eyewall and thus more water vapour is transported to the upper atmosphere, which promotes cloud ice deposition. This process consumes more water vapour, which makes the CTL experiment drier in the upper troposphere/lower stratosphere layer (altitude above 17 km). At 18–20 km altitude, the domain-averaged water vapour mixing ratio of the CTL experiment is ~0.02 ppmv lower than that of the CLEAN experiment. SSA have the effect of strengthening tropical cyclones and increasing precipitation.

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“…Effects of giant aerosols, such as sea‐salt or dust may be different from those of anthropogenic aerosols. Because the radius of the initial particle is larger, giant aerosols can form larger cloud droplet embryos (Johnson, ; Feingold et al, ; Jiang et al, ; Luo et al, ). Dust aerosols as CCN can change cloud droplet number concentration and diameter (Zhang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Simulation of the effects of sea‐salt aerosols on cloud ice and precipitation of a tropical cyclone

Jiang

Lin

et al. 2019

Atmospheric Science Letters

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This study used the Weather Research and Forecasting model with chemistry (WRF‐Chem) with a parameterization for the emissions of sea‐salt aerosols to assess the effects of sea‐salt aerosols on a tropical cyclone. A control simulation (Ctl) and a simulation with a sea‐salt emission flux that is one‐tenth of that in Ctl (Low) were conducted. Results show that sea‐salt aerosols enhance the condensation process, promoting vertical motion and precipitation in a tropical cyclone. Peak precipitation value in Ctl is 120% that in Low. Enhanced vertical motion in Ctl results in increase of water vapor transport to the upper atmosphere, which promotes deposition growth of cloud ice crystals. Therefore, cloud ice mixing ratio and stratiform precipitation in Ctl are larger than those in Low. Stratiform precipitation in the rain band is about 0.5 mm/h in Ctl and about 0.4 mm/h in Low.

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Simulation of the effects of sea-salt aerosols on the structure and precipitation of a developed tropical cyclone

Cited by 11 publications

References 37 publications

A Study of the Effects of Anthropogenic Gaseous Emissions on the Microphysical Properties of Landfalling Typhoon Nida (2016) over China

A Study of the Effects of Anthropogenic Gaseous Emissions on the Microphysical Properties of Landfalling Typhoon Nida (2016) over China

Effects of sea salt aerosols on precipitation and upper troposphere/lower stratosphere water vapour in tropical cyclone systems

Simulation of the effects of sea‐salt aerosols on cloud ice and precipitation of a tropical cyclone

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