1. Arctic sea ice

    Arctic Ocean likely to become ice-free in the summer for first time before 2050

    The Arctic Ocean is likely to have its first ice-free summer before 2050, according to an analysis of simulations from more than 40 different climate models. How frequently the sea ice vanishes in the summer depends on the rate of greenhouse gas emissions in the future.

    • Climate

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  2. South Asian residents face increasing threat of extreme heat combined with extreme air pollution

    As temperatures warm across much of the globe, how often will people be threatened by extreme heat and extreme air pollution happening at the same time?

    • Air Quality,
    • Climate

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  3. The Polarstern frozen in Arctic sea ice.

    Arctic research expedition likely faces extreme conditions in fast-changing Arctic

    Scientists at the National Center for Atmospheric Research (NCAR) have used an ensemble of multiple climate model runs to simulate conditions along potential routes for the MOSAiC polar expedition, using today’s conditions in the “new Arctic.” The results suggest that thinner sea ice may carry the ship farther than would be expected compared to historical conditions and the sea ice around the ship may melt earlier than the 12-month goal. Of the 30 model runs analyzed in the new study, five (17%) showed melt-out in less than a year.

    • Climate

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  4. NCAR senior scientist Warren Washington

    New Warren Washington medal to be awarded by AMS

    The American Meteorological Society has created a new national award in honor of NCAR senior scientist Warren Washington, a pioneer in the development of computer models of Earth's climate.

    • Climate

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  5. Irrigation of agricultural fields in California.

    Irrigation alleviates hot extremes driven by human-caused climate change

    New research finds that irrigation can cancel out, or even reverse, the increased risk of heat extremes associated with human-caused climate change.

    • Climate

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