Chinese lockdown as aerosol reduction experiment

Storch, Hans von; Geyer, Beate; Li, Yan; Matthias, Volker; Rockel, Burkhardt

doi:10.1016/j.accre.2021.03.003

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…3a), resulting in anomalous surface warming over China (Fig. 3c) 32 . This process can destabilize the atmosphere and enhance vertical mixing 33 .…”

Section: Circulation Changes Driven By Aerosol Direct Effectmentioning

confidence: 99%

East Asian climate response to COVID-19 lockdown measures in China

Lee

Chu

Timmermann

et al. 2021

Sci Rep

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The COVID-19 pandemic caused disruptions of public life and imposed lockdown measures in 2020 resulted in considerable reductions of anthropogenic aerosol emissions. It still remains unclear how the associated short-term changes in atmospheric chemistry influenced weather and climate on regional scales. To understand the underlying physical mechanisms, we conduct ensemble aerosol perturbation experiments with the Community Earth System Model, version 2. In the simulations reduced anthropogenic aerosol emissions in February generate anomalous surface warming and warm-moist air advection which promotes low-level cloud formation over China. Although the simulated response is weak, it is detectable in some areas, in qualitative agreement with the observations. The negative dynamical cloud feedback offsets the effect from reduced cloud condensation nuclei. Additional perturbation experiments with strongly amplified air pollution over China reveal a nonlinear sensitivity of regional atmospheric conditions to chemical/radiative perturbations. COVID-19-related changes in anthropogenic aerosol emissions provide an excellent testbed to elucidate the interaction between air pollution and climate.

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“…3a), resulting in anomalous surface warming over China (Fig. 3c) 32 . This process can destabilize the atmosphere and enhance vertical mixing 33 .…”

Section: Circulation Changes Driven By Aerosol Direct Effectmentioning

confidence: 99%

East Asian climate response to COVID-19 lockdown measures in China

Lee

Chu

Timmermann

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

Human impacts and their interactions in the Baltic Sea region

et al. 2022

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Abstract. Coastal environments, in particular heavily populated semi-enclosed marginal seas and coasts like the Baltic Sea region, are strongly affected by human activities. A multitude of human impacts, including climate change, affect the different compartments of the environment, and these effects interact with each other. As part of the Baltic Earth Assessment Reports (BEAR), we present an inventory and discussion of different human-induced factors and processes affecting the environment of the Baltic Sea region, and their interrelations. Some are naturally occurring and modified by human activities (i.e. climate change, coastal processes, hypoxia, acidification, submarine groundwater discharges, marine ecosystems, non-indigenous species, land use and land cover), some are completely human-induced (i.e. agriculture, aquaculture, fisheries, river regulations, offshore wind farms, shipping, chemical contamination, dumped warfare agents, marine litter and microplastics, tourism, and coastal management), and they are all interrelated to different degrees. We present a general description and analysis of the state of knowledge on these interrelations. Our main insight is that climate change has an overarching, integrating impact on all of the other factors and can be interpreted as a background effect, which has different implications for the other factors. Impacts on the environment and the human sphere can be roughly allocated to anthropogenic drivers such as food production, energy production, transport, industry and economy. The findings from this inventory of available information and analysis of the different factors and their interactions in the Baltic Sea region can largely be transferred to other comparable marginal and coastal seas in the world.

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Chinese lockdown as aerosol reduction experiment

Cited by 2 publications

References 31 publications

East Asian climate response to COVID-19 lockdown measures in China

East Asian climate response to COVID-19 lockdown measures in China

Human impacts and their interactions in the Baltic Sea region

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