Markle

Warming has more impact than cooling on Greenland's "firn" (CIRES)

Anonymous — Thu, 25 Jul 2024 23:26:31 +0000

Warming has more impact than cooling on Greenland's "firn" (CIRES) Anonymous (not verified) Thu, 07/25/2024 - 17:26

Stephanie Maltarich , CIRES

A new study found Greenland's "firn" - the spongy layer between ice and snow - is more sensitive to warming than cooling. More specifically, warming temperatures are rapidly changing how efficiently firn can store meltwater, and cooling temperatures may not help it fully recover. Megan Thompson-Munson, a CIRES and ATOC PhD student, led the study alongside her advisors: CIRES Fellow Jen Kay and INSTAAR Fellow Brad Markle.

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Alaska’s top-heavy glaciers are approaching an irreversible tipping point (The Conversation)

Anonymous — Thu, 04 Jul 2024 06:00:00 +0000

Alaska’s top-heavy glaciers are approaching an irreversible tipping point (The Conversation) Anonymous (not verified) Thu, 07/04/2024 - 00:00

The melting of the Juneau Icefield in Alaska—one of North America’s largest icefields—has accelerated and could soon reach an irreversible tipping point, according to a paper by Davies et al. published in Nature Communications. Coauthors include Brad Markle of INSTAAR and Geological Sciences. He is also Director of Academics for the Juneau Icefield Research Program.

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Old core, new data: Students unlock knowledge about past Arctic climates

Anonymous — Thu, 27 Jun 2024 16:55:34 +0000

Old core, new data: Students unlock knowledge about past Arctic climates Anonymous (not verified) Thu, 06/27/2024 - 10:55

Shelly Sommer

A team of students and scientists are reanalyzing the GISP2 ice core, drilled in Greenland during the late 1980s through the early 90s, to investigate mechanisms of abrupt climate change and extreme events of the past.

Assistant Research Professor Tyler Jones, Assistant Professor Brad Markle, and Senior Professional Research Assistant Valerie Morris of INSTAAR’s Stable Isotope Lab are leading a group of students in resampling the Greenland Ice Sheet Project Two (GISP2) core. Water isotopes in the core were originally analyzed to give insight into environmental change in the Arctic over the past 100,000 years.

Now Jones’ group is taking samples from the same core, stored for decades, and analyzing them afresh.

Analytical techniques developed over the past decades mean the team is getting much more detailed data about Earth’s past climate, unlocked from water isotopes.

Jones says, “The original measurements yielded about 3,000 data points over 3,000 meters of ice. Now we will get millions of data points over 2,000 meters of ice.” (The researchers are analyzing two-thirds of the core.)

Jones calls the team “an amazing group.” They include �� Boulder grad students Rhys-Jasper León and Brooke Chase, Front Range Community College student Megan Erskine, Colorado College undergrad student Tirso Lara, and �� Boulder undergrads Ella Johnson and Adira Lunken.

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Tyler Jones, Brad Markle, and Valerie Morris are leading a group of students in resampling the Greenland Ice Sheet Project Two (GISP2) core to investigate mechanisms of abrupt climate change and extreme events of the past. The original measurements (e.g., water isotopes) numbered a few thousand while the new measurements will create millions of data points.

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Photo: Tyler Jones, Rhys-Jasper León, Valerie Morris, Brooke Chase, Tirso Lara, Megan Erskine, Ella Johnson, and Adira Lunken work in the NSF Ice Core Facility, Lakewood Colorado.

Faces of the Front Range: Bruce Vaughn and Bradley Markle look to save the world by understanding it (Denver Post)

Anonymous — Mon, 11 Oct 2021 06:00:00 +0000

Faces of the Front Range: Bruce Vaughn and Bradley Markle look to save the world by understanding it (Denver Post) Anonymous (not verified) Mon, 10/11/2021 - 00:00

Denver Post profile of a visit to the Stable Isotope Lab, where Bruce Vaughn and Brad Markle shared ice cores, knowledge, and what keeps them going while researching the climate past and present. To read this article, you may need to enter your email address.

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Markle

Warming has more impact than cooling on Greenland's "firn" (CIRES)

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Alaska’s top-heavy glaciers are approaching an irreversible tipping point (The Conversation)

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Old core, new data: Students unlock knowledge about past Arctic climates

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Faces of the Front Range: Bruce Vaughn and Bradley Markle look to save the world by understanding it (Denver Post)

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