New! Sign up for our free email newsletter.
Science News
from research organizations

Atmospheric effects of Arctic snowmelt

Date:
September 20, 2017
Source:
University of Alaska Fairbanks
Summary:
Researchers are exploring the changing chemistry of the Arctic's atmosphere to help answer the question of what happens as snow and ice begin to melt.
Share:
FULL STORY

Researchers at the University of Alaska Fairbanks' Geophysical Institute are exploring the changing chemistry of the Arctic's atmosphere to help answer the question of what happens as snow and ice begin to melt.

The research, led by chemistry professor William R. Simpson, is concerned with the Arctic's reactive bromine season, which is the period of time when bromine is consuming ozone, producing bromine monoxide and oxidizing mercury.

Reactive bromine events occur during Arctic springtime, when temperatures are low and sea ice is snow-covered. As springtime transitions to summer, with temperatures climbing above freezing and snowpack melting, these events cease and atmospheric bromine quantities become low.

"Atmosphere chemistry really changes when snow melts," said Simpson. "And earlier melt is changing what is happening in the atmosphere."

While scientists studying the Arctic typically have a narrow time window to gather information, Simpson's research group used a year-round data set that included buoy-based observations in the Arctic Ocean.

Peter K. Peterson, one of Simpson's student researchers, noted a predictive application of the research: An increased understanding of bromine reactivity could help scientists figure out how "the atmospheric composition in the Arctic might respond to rapidly changing sea ice conditions."

"Monitoring the seasonal end date each year could give us an indication of climate change as well, since it correlates to temperature change," added Justine A. Burd, the student researcher who processed the data and research correlations. "Is the bromine season ending earlier each year, staying approximately the same, or getting longer?"

In Utqia?vik, the melt season has lengthened approximately eight days over the past 60 years, while in the pan-Arctic region the season has lengthened approximately five days per decade. As the snowmelt season lengthens, or as Arctic springtime is reduced, the bromine season becomes increasingly shorter.

"Knowing how snow and ice affect the atmosphere is becoming even more important considering the changing Arctic ice pack and changing Arctic temperatures," said Simpson. "This narrow work is one part of a big, broad question: what happens when snow starts to melt?"

A paper co-authored by Burd, Peterson and Simpson that includes the group's methodology and findings has been published by the American Geophysical Union.


Story Source:

Materials provided by University of Alaska Fairbanks. Note: Content may be edited for style and length.


Journal Reference:

  1. Justine A. Burd, Peter K. Peterson, Son V. Nghiem, Don K. Perovich, William R. Simpson. Snowmelt onset hinders bromine monoxide heterogeneous recycling in the Arctic. Journal of Geophysical Research: Atmospheres, 2017; 122 (15): 8297 DOI: 10.1002/2017JD026906

Cite This Page:

University of Alaska Fairbanks. "Atmospheric effects of Arctic snowmelt." ScienceDaily. ScienceDaily, 20 September 2017. <www.sciencedaily.com/releases/2017/09/170920100040.htm>.
University of Alaska Fairbanks. (2017, September 20). Atmospheric effects of Arctic snowmelt. ScienceDaily. Retrieved June 17, 2024 from www.sciencedaily.com/releases/2017/09/170920100040.htm
University of Alaska Fairbanks. "Atmospheric effects of Arctic snowmelt." ScienceDaily. www.sciencedaily.com/releases/2017/09/170920100040.htm (accessed June 17, 2024).

Explore More

from ScienceDaily

RELATED STORIES