Classification of aerosol-cloud interaction regimes over Tokyo

Misumi, Ryohei; Uji, Yasushi; Miura, Kazuhiko; Mori, Tatsuhiro; Tobo, Yutaka; Iwamoto, Yoko

doi:10.1016/j.atmosres.2022.106150

Cited by 9 publications

(2 citation statements)

References 45 publications

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“…Our case of tropical shallow convective clouds in a pristine marine environment 22 , with r eff > 14 µm and N d mostly in the range of 15-35 cm − 3 (Extended Data Fig. 1), is considered an aerosol-limited regime 39 . The mechanism that we are proposing would mean that new particle formation plays an even more critical role in Earth climate system than previously thought, especially in aerosol-limited environments (such as pre-industrial) where new particle formation is a major source of cloud condensation nuclei and where cloud cover is highly susceptible to increase in aerosol.…”

Section: Discussionmentioning

confidence: 99%

Evidence that deliberate marine cloud brightening can be more effective than previously thought

Chen,

Haywood,

Wang

et al. 2023

Preprint

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With global warming currently standing at approximately + 1.2 oC, climate change is a pressing global issue. Marine cloud brightening (MCB) proposes injecting aerosols into marine clouds to enhance their reflectivity and thereby planetary albedo. However, because it is unclear how aerosols influence clouds, especially cloud cover, both climate projections and the effectiveness of MCB remain uncertain. Here, we use volcanic eruptions to quantify the aerosol fingerprint on tropical marine clouds. We observe a large enhancement in reflected sunlight, mainly due to an aerosol-induced increase in cloud cover. This observational evidence of a strong aerosol impact suggests that the Earth’s climate is highly sensitive to external forcing mechanisms, but also that mitigation of global warming via MCB is more plausible than current climate models suggest. Our results suggest that the best efficacy for MCB practice is to seed clouds in humid and stable meteorological conditions.

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Section: Discussionmentioning

confidence: 99%

Evidence that deliberate marine cloud brightening can be more effective than previously thought

Chen,

Haywood,

Wang

et al. 2023

Preprint

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“…Studies have found that in industrial regions and their adjacent ocean regions, the Twomey effect exists between aerosols and cloud droplet effective radius over the ocean regions, whereas the opposite is observed over land regions (Ma et al 2018;Jia et al 2019). Misumi et al (2022) found that increased anthropogenic aerosol emissions in Tokyo led to an increase in cloud particle radius, while off the coast of the Japanese archipelago in the northern Paci c, a strong negative correlation between AOD and cloud particle effective radius was observed (Zhao et al 2018b). The water vapor conditions seem to in uence this anti-Twomey effect under high aerosol loading.…”

Section: Discussionmentioning

confidence: 99%

Aerosol Influence on Cloud Macrophysical and Microphysical Properties over the Tibetan Plateau and Its Adjacent Regions

Wei,

Zhao,

Wang

et al. 2023

Preprint

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This study uses aerosol optical depth (AOD) and cloud properties data to investigate the influence of aerosol on the cloud properties over the Tibetan Plateau and its adjacent regions. The study regions are divided as the western part of the Tibetan Plateau (WTP), the Indo-Gangetic Plain (IGP), and the Sichuan Basin (SCB). All three regions show significant cloud effects under low aerosol loading conditions. In WTP, under low aerosol loading conditions, the effective radius of liquid cloud particles (LREF) decreases with the increase of aerosol loading, while the effective radius of ice cloud particles (IREF) and cloud top height (CTH) increase during the cold season. Increased aerosol loading might inhibit the development of warm rain processes, transporting more cloud droplets above the freezing level and promoting ice cloud development. During the warm season, under low aerosol loading conditions, both the cloud microphysical (LREF and IREF) and macrophysical (cloud top height and cloud fraction) properties increase with the increase of aerosol loading, likely due to higher dust aerosol concentration in this region. In IGP, both LREF and IREF increase with the increase in aerosol loading during the cold season. In SCB, LREF increases with the increase in aerosol loading, while IREF decreases, possibly due to the higher hygroscopic aerosol concentration in the SCB during the cold season. Meteorological conditions also modulate the aerosol-cloud interaction. Under different convective available potential energy (CAPE) and relative humidity (RH) conditions, the influence of aerosol on clouds varies in the three regions. Under low CAPE and RH conditions, the relationship between LREF and aerosol in both the cold and warm seasons is opposite in the WTP: LREF decreases with the increase of aerosol in the cold season, while it increases in the warm season. This discrepancy may be attributed to a difference in the moisture condition between the cold and warm seasons in this region.

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Spatial heterogeneity of aerosol effect on liquid cloud microphysical properties in the warm season over Tibetan Plateau

Zhao

Yuan

et al. 2022

Preprint

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The effect of aerosol on liquid cloud microphysical properties over the Tibetan Plateau during the warm season is investigated by employing aerosol index and cloud property parameters. Distinct differences in aerosol effect on liquid cloud microphysical properties have been found between the northern TP (NTP) and southern TP (STP). The composite liquid cloud droplet effective radius (LREF) anomalies for positive aerosol index (AI) events are positive in the NTP and negative in the STP.In both NTP and STP, when the AI anomalies are positive, the LREF anomalies are also positive, which suggests that the increased aerosol loading reduces the solar radiation reaching the ground and thus enhances the atmospheric stability, making cloud droplets not conducive to break up. This indicates that the aerosol radiative effect is not likely the reason causing the distinct differences of aerosol effects on liquid cloud properties between NTP and STP. Further analysis shows that in the STP, the LREF first increases and then decreases with the increase of AI, while in the NTP, the LREF always increases with the increase of AI, suggesting a spatial difference in aerosol microphysical effect. In the STP, the influence of aerosol on liquid clouds is mainly dependent on liquid water path (LWP) and convective available potential energy (CAPE), while in the NTP, the influence of aerosol on liquid cloud is more likely related to large aerosol particles.

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Classification of aerosol-cloud interaction regimes over Tokyo

Cited by 9 publications

References 45 publications

Evidence that deliberate marine cloud brightening can be more effective than previously thought

Evidence that deliberate marine cloud brightening can be more effective than previously thought

Aerosol Influence on Cloud Macrophysical and Microphysical Properties over the Tibetan Plateau and Its Adjacent Regions

Spatial heterogeneity of aerosol effect on liquid cloud microphysical properties in the warm season over Tibetan Plateau

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