The research deepens our understanding of how humans affect climate change

This was done by isolating and quantifying the effects of the two forces using coupled climate model simulations.

The researchers found that aerosol-driven changes in ocean circulation and the associated interbasin heat transport capabilities are more effective at altering the distribution of ocean heat than those caused by globally increasing GHGs.

“A better understanding of the impact of individual anthropogenic forcings on ocean heat redistribution and their impact on regional sea-level change will help develop climate mitigation strategies,” said Wei Liu, assistant professor of climate change and sustainability in the Department of Earth and Planets. Sciences, who led the study, published yesterday in Nature Geoscience.

Anthropogenic aerosols and GHGs have been proposed as the main drivers of climate change. The team’s results improve understanding of their impact.

Anthropogenic greenhouse gas emissions have increased steadily over the “historical period” from about 1850 to almost the present. Anthropogenic aerosols, on the other hand, first increased during this period and then began to decrease starting in the 1980s due to air quality legislation in some parts of the world.

The researchers mainly used the following related climate model simulations from the historical period:

HIST-AER – Patterns are driven only by anthropogenic aerosol changes over the historical period.

HIST-GHG – Patterns are driven only by human-caused changes in greenhouse gases over the historical period.

HIST – The patterns are driven by all forces, including human-induced changes in aerosol and greenhouse gases, land use, and volcanic eruptions over the historical period.

piControl – All forcings are set to pre-industrial levels.

“In the aerosol forcing scenario, the interbasin heat exchange — the exchange of heat between ocean basins — is comparable to the change in ocean heat uptake by changing the stored heat,” Liu said. “This is particularly evident in the Atlantic and Indo-Pacific. Under the greenhouse gas forcing scenario, interbasin heat exchange is much less important than changes in ocean heat uptake. This may be due to the fact that in this scenario the effect of ocean circulation is strongly offset by temperature changes.

Liu explained that inter-basin heat exchange is important for the redistribution of heat between basins, which can affect regional climate change manifested as sea-level rise.

“Rapid sea-level rise has been one of the most serious threats since the last century, and will continue to do so for at least another century,” he said. “Sea-level rise is not globally uniform, but regionally distributed. Regional and coastal sea-level changes, as well as extreme coastal changes, can cause public concerns, such as displacement of coastal communities and potential damage to natural resources and coastal infrastructure.

Shouwei Li, the paper’s first author and a graduate student in Liu’s lab, explained why the study found that ocean heat distribution can be more effectively altered by aerosol-driven changes in ocean circulation and associated interbasin heat transport, rather than globally. increasing GHG.

“This may be due to the difference between aerosol and GHG distributions,” he said. “Increases in well-mixed GHGs are global, while changes in aerosols are mainly enhanced in the Northern Hemisphere due to more human activity and industry.”

The research team also used observations to compare with model results.

“We found ocean warming from model simulations that closely matched observations,” Liu said.

Liu and Li were joined in the study by Robert J. Allen of UCR, Jia-Rui Shi of Woods Hole Oceanographic Institution, and Laifang Li of Pennsylvania State University. (ANI)

This report is automatically generated from the ANI news service. ThePrint takes no responsibility for its content.

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