[HN Gopher] Low Antarctic continental climate sensitivity due to...
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Low Antarctic continental climate sensitivity due to high ice sheet
orography
Author : bilsbie
Score : 51 points
Date : 2023-01-29 14:02 UTC (8 hours ago)
(HTM) web link (www.nature.com)
(TXT) w3m dump (www.nature.com)
| xwdv wrote:
| I guess the term "global warming" is inaccurate. More like,
| equatorial warming.
| EdwardDiego wrote:
| Well, the atmosphere is retaining more energy, but you've
| perfectly encapsulated why the terminology moved to climate
| change.
| ajross wrote:
| That's not what this paper proposes. And it's wrong anyway:
| antarctic ocean waters absolutely are warming (c.f. the
| collapse of the floating ice sheets). The observation here is
| that the continental interior isn't showing the same changes.
| And as I scan the abstract, the model seems to be just simple
| buffering: lots of sub-freezing deep ice can absorb lots of
| heat without appreciable changes in surface temperature.
| tony_cannistra wrote:
| > the model seems to be just simple buffering: lots of sub-
| freezing deep ice can absorb lots of heat without appreciable
| changes in surface temperature.
|
| Sorry, but I don't think you've interpreted the study well.
| You're right about the lack of interior warming - that's the
| premise of the study. But the study attributes this to the
| orographic effect of the relatively high elevation of the
| Antarctic Ice Sheet (AIS) - not any effect of heat buffering
| in the ice.
|
| To determine this, they "flattened" (e.g. removed all
| influence of terrain from) the AIS, and ran global climate
| models over this modified terrain.
|
| They determined that the terrain _itself_, which is the
| progenitor of orographic effects in the atmosphere, was
| responsible for the lack of interior temperature rise.
| Orographic effects at synoptic/continental scales can have a
| substantial impact on latent heat transport - they showed
| that here.
|
| Perhaps thermal buffering has a place in the conversation
| too, but it's not mentioned in this paper.
| tgv wrote:
| It's called (anthropogenic, i.e. man-made) climate change
| nowadays. Because pumping a lot of energy in the atmosphere and
| oceans can also cool down regions, or make the range between
| extremes wider, or cause more torments and downfall.
| zackees wrote:
| [dead]
| BlueTemplar wrote:
| CO2-sinners, repent !
| lowken wrote:
| It's called climate change because it's a marketing term and
| not a scientific one.
| EdwardDiego wrote:
| You don't think that more energy being retained in our
| atmosphere will cause changes in climate?
| tomrod wrote:
| I know folks don't like to talk about increases in variance,
| but why not increase in mean and more variance?
| bannedbybros wrote:
| [dead]
| jfengel wrote:
| The poles are more sensitive, and you can see that at the north
| pole, where it is warming much faster than the equator.
|
| The south pole doesn't exhibit that increase, which requires
| explanation. The obvious answer would be the land mass covered
| in ice serving as a heat sink, but the paper suggests that it's
| more about elevation.
| someweirdperson wrote:
| The poles are less sensitive, and you can see that at the
| south pole, where it is warming much slower than the equator.
| The noth pole doesn't exhibit that stability, which requires
| explanation.
|
| Trying to explain that something is the normal behavior, and
| that something else is the exception requires more than a
| sample size of two.
|
| To prove that the increase of poles is the norm you'll need
| to describe the behavor of a few more poles. Maybe west and
| east pole?
| trebligdivad wrote:
| nice word; 'Orography is the study of the topographic relief of
| mountains' https://en.wikipedia.org/wiki/Orography
| gmuslera wrote:
| Not having an ocean below helps to isolate a bit from all the
| heat that the oceans has been absorbing. Around the north pole
| the average temperature is 4+oC above the average of 1950-1980.
|
| And yet, that isolation is not so good. A year ago the
| temperature in the Concordia station at a 3km height was 40oC
| over its average temperature for that time of the year
| (https://english.elpais.com/science-
| tech/2022-03-30/a-heatwav...).
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(page generated 2023-01-29 23:01 UTC)