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Thread: The effects of warming: Kilodeaths

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    Administrator lpetrich's Avatar
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    Earth's 5 warmest years on record have occurred since 2014 - Axios
    The ratio of warm and cold temperature records is increasingly skewed - Axios
    This is how much the world has warmed since 1880 - Axios

    Berkeley Earth - 2018 Temperatures - 1850 to 2018
    Temperature rise since 1850: 1.2 C

    Global-averaged temperature roughly constant until it started rising ~ 1910.
    Why the Little Ice Age Doesn't Matter - The Atlantic
    No evidence for globally coherent warm and cold periods over the preindustrial Common Era | Nature
    The variation is mostly regional.

    Report: Global temps are the highest they've been in 4,000 years - the first half of the Holocene was relatively warm, though likely not as warm as today.
    A Reconstruction of Regional and Global Temperature for the Past 11,300 Years | Science
    The pattern of temperatures shows a rise as the world emerged from the last deglaciation, warm conditions until the middle of the Holocene, and a cooling trend over the next 5000 years that culminated around 200 years ago in the Little Ice Age. Temperatures have risen steadily since then, leaving us now with a global temperature higher than those during 90% of the entire Holocene.
    NASA GISS: Science Briefs: Earth's Climate History: Implications for Tomorrow - the Holocene has been about as warm as it ever has been over the last 3 million years -- that includes the entire Pleistocene (2.5 m.y.), and it is a little bit into the Pliocene.

    Also shows graphs of the steady loss of Greenland and Antarctic ice, as measured by the GRACE pair of gravity satellites. They transmit signals to each other, and the back-and-forth time for them gives their separation.

    Ice Sheets | Vital Signs – Climate Change: Vital Signs of the Planet - Greenland and Antarctica for 2002 - 2017 - from their gravity, they are losing ice. They gain some in local winter, but they lose more in local summer.

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    Administrator lpetrich's Avatar
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    Dansgaard–Oeschger event
    In the Northern Hemisphere, they take the form of rapid warming episodes, typically in a matter of decades, each followed by gradual cooling over a longer period. For example, about 11,500 years ago, averaged annual temperatures on the Greenland ice sheet warmed by around 8 °C over 40 years, in three steps of five years (see,[3] Stewart, chapter 13), where a 5 °C change over 30–40 years is more common.

    Heinrich events only occur in the cold spells immediately preceding D-O warmings, leading some to suggest that D-O cycles may cause the events, or at least constrain their timing.[4]

    The course of a D-O event sees a rapid warming of temperature, followed by a cool period lasting a few hundred years.[5] This cold period sees an expansion of the polar front, with ice floating further south across the North Atlantic Ocean.[5]
    Geologic temperature record - a lot warmer than the present over much of the Phanerozoic. Likely from reduced or absent ice sheets: no very cold spots.

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