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Study: Mountain Monitoring System Artificially Inflates Temperature Increases at Higher Elevations

Friday, January 16th, 2015 6:10pm MDT
Warming mountain climate?  A new study raises serious questions about the accuracy of the data. (Tony's Takes)

Warming mountain climate? A new study raises serious questions about the accuracy of the data. (Tony’s Takes)

We have all heard the warnings about a warming climate and scientists have claimed to have the data to prove it.  However time and time again the very underlying data has been shown to be faulty.  Here we again find another case.

A new study from the University of Montana shows extreme warming bias in temperature data from critical networks.  The study takes a hard look at climate data gathered across the Rocky Mountain west, including here in Colorado.

“In the context of a warming climate, this artificial amplification of mountain climate trends has likely compromised our ability to accurately attribute climate change impacts across the mountainous western US,” author Jared Oyler writes in his study.

From the University of Montana:

January 12, 2015

MISSOULA – In a recent study, University of Montana and Montana Climate Office researcher Jared Oyler found that while the western U.S. has warmed, recently observed warming in the mountains of the western U.S. likely is not as large as previously supposed.

His results, published Jan. 9 in the journal Geophysical Research Letters, show that sensor changes have significantly biased temperature observations from the Snowpack Telemetry (SNOTEL) station network.

More than 700 SNOTEL sites monitor temperature and snowpack across the mountainous western U.S. SNOTEL provides critical data for water supply forecasts. Researchers often use SNOTEL data to study mountain climate trends and impacts to mountain hydrology and ecology.

Oyler and his co-authors applied statistical techniques to account for biases introduced when equipment was switched at SNOTEL sites in the mid-1990s to mid-2000s. His revised datasets reduced the biases to reveal that high-elevation minimum temperatures were warming only slightly more than minimum temperatures at lower elevations.

“Observations from other station networks clearly show that the western U.S. has experienced regional warming,” Oyler said, “but to assess current and future climate change impacts to snowpack and important mountain ecosystem processes, we need accurate observations from the high elevation areas only covered by the SNOTEL network. The SNOTEL bias has likely compromised our ability to understand the unique drivers and impacts of climate change in western U.S. mountains.”

Co-authors on the paper “Artificial Amplification of Warming Trends Across the Mountains of the Western United States” include UM researchers Solomon Dobrowski, Ashley Ballantyne, Anna Klene and Steve Running. It is available online at http://onlinelibrary.wiley.com/enhanced/doi/10.1002/2014GL062803/.

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Contact: Jared Oyler, Montana Climate Office, 215-260-4487, jared.oyler@ntsg.umt.edu.

On the net:  Study: US Weather Stations Exaggerated Warming In Western Mountains

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