After spending two months in the Arctic Ocean aboard the Chinese vessel Xuelong or Snow Dragon, University of Texas at San Antonio Associate Professor of Geological Sciences Hongjie Xie says global warming is both real and imminent. In fact, Arctic ice is melting quicker than researchers thought it would.
While much of the global warming debate has focused on the reasons for global warming and the disadvantages brought on by it, such as the impacts on Arctic ecology, marine mammals, indigenous communities, etc., Xie says the Chinese believe it also creates a significant opportunity.
Global warming in the Arctic is an extremely hot topic in navigation said Xie, who manages UTSAs Laboratory for Remote Sensing and Geoinformatics. The Chinese are extremely interested, because they and others would be able to sail their cargo ships through the Arctic Ocean to North America and Europe with much reduced cost. At the melting rate we are observing now, they may be able to do so in 30 to 50 years.
Xie adds, In the past, travelers could only get to the lowest Arctic latitudes in the summer season, but now the ice has melted so much, large ships can navigate into the higher latitudes. Xuelong traveled to 88.4 degrees latitude with no problems. A few years ago, we could not have done that. We would have run into ice blocks three meters or more in thickness.
He notes, however, While there is a great opportunity, Arctic navigation is a complex issue. Those involved will need to consider a variety of factors such as environmental pollution, oil spills, search and rescue, national security, and navigation rights in territorial waters.
Xie and a scholar from the University of Georgia were the only Americans invited to take part in the Fourth Chinese Arctic Expedition, a two-month data gathering trip organized by the Chinese government. The trip served as a fact-finding mission for Xie, who represented the U.S. National Oceanic and Atmospheric Administrations Sea Ice Outlook Program. The Chinese focused their research on the mechanisms of sea ice melting, how that melting is impacting the Arctic ecosystem and how it might affect the Chinese climate.
In all, 61 researchers, 54 crew members and six Chinese journalists participated in the expedition. They represented France, Finland, Taiwan, Estonia, the U.S. and numerous Chinese universities and research programs.
So why does Xie think Arctic sea ice is melting so rapidly?
Its a positive feedback system, he says. Sea ice melts both from the bottom up due to increased ocean temperature and from the top down. When that happens, the melted ice leaves more open water which absorbs more solar radiation and raises the temperature of the water even more. The temperature increase causes even more ice to melt and so on and so forth.
While in the Arctic, Xie took photos, videos and quantitative measurements of Arctic sea ice during his journey. That in situ data will be combined with satellite data to help researchers across the world better understand Arctic climate and change.
Xie launched his career in 2002 after earning his doctorate in Remote Sensing and Geographic Information Systems (GIS) from the University of Texas at El Paso. In 2004, he joined UTSAs faculty. He, and a world-renowned sea ice scientist, UTSA Research Associate Professor Stephen Ackley, gained funding from the National Science Foundations Office of Polar Programs and the National Aeronautics and Space Administrations Cryosphere Science Program. Since then, Xie and his group have taken two expeditions to Antarctica (2006 and 2007) in addition to his 2010 Arctic expedition. Xie and Ackley are sending researchers and students on two additional Antarctic sea ice trips in November and December 2010. Xie hopes to participate in the 2012 Chinese Arctic expedition by sending a couple of UTSA graduate students as well.