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Science News for December 31, 2021


Natural feedback or human activities? A new study points to agricultural and industrial sources as the main cause to the soaring atmospheric methane

A new study confirms that emissions from anthropogenic sources, including agriculture, landfill/waste, and fossil fuel industry, are the driver for the renewed rise of potent greenhouse gas since 2007. Global wetlands play a minor role with less than 20% contribution to atmospheric methane.

SourceScience China Press·JournalNational Science Review·DateDec 31, 2021
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Direct/indirect effects of aerosols and their separate contributions to a tropical cyclone approaching the continent: Eyewall versus peripheral rainbands

Researchers found that aerosols had a significant impact on tropical cyclone TC Lupit as it approached the Asian continent. Direct aerosol-radiation interactions (ARI) weakened convection in the eyewall, while indirect aerosol-cloud interactions (ACI) enhanced convection and intensified the typhoon.

SourceScience China Press·JournalScience China Earth Sciences·DateDec 31, 2021

Non-Einsteinian gravitational wave background in NANOGrav 12.5-year data set

Researchers detected strong Bayesian evidence for a spatially correlated process with scalar transverse correlations, suggesting an alternative theory of gravity beyond Einstein's general relativity. The study uses the North American Nanohertz Observatory for Gravitational Waves' 12.5-year data set.

SourceScience China Press·JournalScience China Physics Mechanics and Astronomy·DateDec 31, 2021
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