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#icecore

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Dr Micha Campbell

In an ocean of bad news, here's some science excitement - the beyond EPICA team has announced they've drilled an ice core dating continuosly to 1.2 million years ago!! This core will give key information about the transition to the 100-000 year earth - the cycle of glacials and interglacials in which we currently live. So cool (pun intended).

#Antarctica #paleoclimate #IceIceBaby #IceCore #ClimateScience

awi.de/ueber-uns/service/press

www.awi.dePresse Detailansicht - AWI
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anlomedad

Waiting for the handyman.
Reading a paper on analyzing firn in Antarctica. Firn is the snow layer before it gets compacted to actual ice. The firn layer contains gas like methane or CO2, too, but the air bubbles aren't strictly sorted on input date 😁 The bubbles can be older or younger than their immediate surrounding. (True for real ice layers, too.)

All very interesting.
tc.copernicus.org/articles/13/
"Multi-tracer study of gas trapping in an East Antarctic ice core" by Kevin #Fourteau et al 2019.

The absolute shocking byproduct of their incredibly thorough work is a 2700 year data series for CH4 in MONTHLY resolution!! doi.pangaea.de/10.1594/PANGAEA

From -930 to 1774 AD.
Their gas dating method is so exact that they pinpoint several different days for every month, too.

I am stunned that monthly resolution is possible. And this was merely a byproduct of figuring out the best way to analyze firn.

tc.copernicus.orgMulti-tracer study of gas trapping in an East Antarctic ice coreAbstract. We study a firn and ice core drilled at the new “Lock-In” site in East Antarctica, located 136 km away from Concordia station towards Dumont d'Urville. High-resolution chemical and physical measurements were performed on the core, with a particular focus on the trapping zone of the firn where air bubbles are formed. We measured the air content in the ice, closed and open porous volumes in the firn, firn density, firn liquid conductivity, major ion concentrations, and methane concentrations in the ice. The closed and open porosity volumes of firn samples were obtained using the two independent methods of pycnometry and tomography, which yield similar results. The measured increase in the closed porosity with density is used to estimate the air content trapped in the ice with the aid of a simple gas-trapping model. Results show a discrepancy, with the model trapping too much air. Experimental errors have been considered but do not explain the discrepancy between the model and the observations. The model and data can be reconciled with the introduction of a reduced compression of the closed porosity compared to the open porosity. Yet, it is not clear if this limited compression of closed pores is the actual mechanism responsible for the low amount of air in the ice. High-resolution density measurements reveal the presence of strong layering, manifesting itself as centimeter-scale variations. Despite this heterogeneous stratification, all layers, including the ones that are especially dense or less dense compared to their surroundings, display similar pore morphology and closed porosity as a function of density. This implies that all layers close in a similar way, even though some close in advance or later compared to the bulk firn. Investigation of the chemistry data suggests that in the trapping zone, the observed stratification is partly related to the presence of chemical impurities.
#paleoclimate#methane#CH4
Public
Barbara J. King

Art and science intersect: "Little pieces of Antarctica were melting: cross-sections of an ice core...Artist Porras-Kim found another kind of collection, at the Ice Core Facility, where about 25,000 meters of ice are neatly stashed in metal tubes within a giant freezer kept at -38 C. About 2,000 meters a year are deaccessioned to make room for new samples; this is how Porras-Kim was able to obtain the cores for her exhibition." nytimes.com/2024/04/05/arts/de #art #science #climate #icecore #museum

The New York Times · Her Art Is at Odds With Museums, and Museums Can’t Get EnoughBy Karen Rosenberg
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