Reference Article

from Wikipedia, the free encyclopedia

Ice core

An ice core is a core sample from the accumulation of snow and ice over many years that have recrystallized and have trapped air bubbles from previous time periods.

The composition of these ice cores, especially the presence of hydrogen and oxygen isotopes, provides a picture of the climate at the time.

Because water molecules containing heavier isotopes exhibit a lower vapor pressure, when the temperature falls, the heavier water molecules will condense faster than the normal water molecules.

The relative concentrations of the heavier isotopes in the condensate indicate the temperature of condensation at the time, allowing for ice cores to be used in global temperature reconstruction.

In addition to the isotope concentration, the air bubbles trapped in the ice cores allow for measurement of the atmospheric concentrations of trace gases, including greenhouse gases carbon dioxide, methane, and nitrous oxide.

The air bubbles may also contain traces of aerosols, which are produced in great concentrations during volcanic eruptions.

Note: This article excerpts material from the Wikipedia article "Ice core", which is released under the GNU Free Documentation License.

See the following related content on ScienceDaily:


Related Videos

last updated on 2014-04-19 at 7:02 pm EDT

Billion Dollar Drilling Project Aims for Earth's Mantle

Billion Dollar Drilling Project Aims for Earth's Mantle

Reuters (Jan. 8, 2013) A Japanese-led project aims to drill to the Earth's mantle, a 3000 kilometer-thick layer of slowly deforming rock between the crust and the core. In its early stages, the $US1 billion mission would deploy a drill just 30 centimeters wide to bore into the Earth's crust to bring back the first ever samples of fresh mantle rock.
Powered by NewsLook.com
HTC One Max Android Smartphone Phablet Review

HTC One Max Android Smartphone Phablet Review

TheStreet (Dec. 26, 2013) HTC's new One Max smartphone is HUGE - the phablet has a 5.9 inch 1080x1920 display. Compared to the original HTC One and the Apple iPhone, the size of the One Max is very noticeable. The One Max comes with 2 gigabytes of RAM, a quad-core Snapdragon 600 processor, 4-megapixel rear camera, 2.1-megapixel front-facing camera, and a high-capacity battery. TheStreet's Gary Krakow finds the HTC One Max to be a great performer with a beautiful display, but holding the device for extended periods of time can be tiring.
Powered by NewsLook.com
Arctic Scramble: Climate Change Prompts Resource Race

Arctic Scramble: Climate Change Prompts Resource Race

France 24 (Mar. 2, 2013) As the Arctic ice melts, the battle for natural resources is heating up. Up to a quarter of the world's oil and gas deposits are thought to lie beneath the chilly seas, and big global players such as China are trying to get in on the act. In our debate, the Norwegian ambassador to Belgium defends the drilling interests of a traditional Arctic power, while a Swedish Green MEP questions Oslo's stance on the environment.
Powered by NewsLook.com
Japan Plans $470M Ice Wall to Stop Fukushima Leaks

Japan Plans $470M Ice Wall to Stop Fukushima Leaks

Newsy (Sep. 3, 2013) To contain the leaks and decrease the radiation levels in the contaminated water, Tokyo has unveiled plans to build an underground ice wall.
Powered by NewsLook.com

Related Stories


Share This



Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins