彩民宝典

While about one-third of the world鈥檚 population depends to some degree on fresh water within the High Asia hydrological system, there鈥檚 little data on the resources now or projections for future

A 彩民宝典 team is partnering with the United States Agency for International Development to assess snow and glacier contributions to water resources originating in the high mountains of Asia that straddle 10 countries.

Richard Armstrong and Mark Williams, the two faculty members leading the four-year study, said the aim is to provide a comprehensive and systematic assessment of freshwater resources in the so-called 鈥淗igh Asia鈥� region, which encompasses five mountain ranges and watersheds totaling roughly 1 million square miles.听 The area under study is roughly equal to one-third of the contiguous United States.

This assessment will be crucial in helping to forecast the future availability and vulnerability of water resources in the region, beginning with accurate assessments of the distinct, separate contributions to river discharge from melting glacier ice and seasonal snow.听 Such data ultimately will provide a better understanding of the timing and volume of runoff in the face of climate change, said the CU-Boulder researchers.

The High Asia mountains funnel water into such major river basins as the Ganges, Brahmaputra, Indus, Amu Darya and Syr Darya. The High Asian mountain ranges under study include the Himalaya, Karkoram, Hindu Kush, Pamir and Tien Shan.听 The mountain ranges straddle Bhutan, Nepal, China, India, Pakistan, Afghanistan, Kazakhstan, Uzbekistan, Kyrgyzstan and Tajikistan.

Through the partnership, scientists and students within the 10 countries will carry out collaborative research with CU-Boulder scientists. The project also will support satellite data processing by CU-Boulder staff and trainings for local institutions and observers within the study area to collect water and precipitation samples for the project.

While about one-third of the world鈥檚 population depends to some degree on fresh water within the High Asia hydrological system, not enough data exists on river and stream flows and the contribution of seasonal snow and glacier melt to paint an accurate picture of the water resources there, said Armstrong, a senior research scientist at CU-Boulder鈥檚 National Snow and Ice Data Center, or NSIDC.

The team requires an accurate quantitative portrait of each major river basin and sub-basin in High Asia. The Indus River, for example, which is fed by waterways from the Himalaya, Karakorum and Hindu Kush mountain ranges, comes together at the city of Besham, Pakistan, 鈥渨here it immediately turns into the largest irrigation system in the world,鈥� said Williams.听 鈥淭he sources of water in High Asia feeding the major foothill regions where most of the people live are really the crux of this study.鈥�

Armstrong said there is a lot of misinformation in the public arena regarding glaciers, including reports that glaciers in the Himalaya are receding faster than anywhere else in the world and, if this rapid melting continues, rivers are on track to first flood and then dry up.听 鈥淭hose reports simply are not true,鈥� Armstrong said.

USAID is an independent United States government agency that provides economic, development and humanitarian assistance around the world in support of the foreign policy goals of the United States.

鈥淯SAID wants to know how the High Asia water resources affect local populations,鈥� said Armstrong, also a fellow at the CU-headquartered Cooperative Institute for Research in Environmental Sciences. 鈥淭hey are looking at this challenge from a sustainability perspective, including what is going to happen to rivers like the Indus and the Brahmaputra in the next 20 years.鈥�

The researchers will use remote-sensing satellite data from NASA, the European Space Agency and the Japanese Space Agency to develop time-series maps of seasonal snowfall amounts and recent changes in glacier extent, said Williams, a fellow at CU-Boulder鈥檚 Institute of Arctic and Alpine Research and a CU-Boulder geography professor.听 They also will use local meteorological and river discharge data from throughout the High Asia study area.

鈥淲hat鈥檚 really driving this study are questions about water security,鈥� said Williams.听 鈥淭here is a lot of international interest in accurate water resource data from the High Asia region and what the water security consequences are, since water conflicts between countries can escalate rapidly. This study should provide answers as to what is real and what is false.鈥�

鈥淥nce we have a picture of recent and current conditions, we can go forward and run computer 鈥榤elt models鈥� based on the temperatures at various elevations, giving us trends in snowmelt and glacier melt by region and time,鈥� said Armstrong.听 鈥淭hat鈥檚 when we start to come up with water volumes for individual rivers and streams from both melting snow and ice.鈥�

The modeling results will be verified using geochemical and water isotope 鈥渢racer鈥� techniques developed at CU that allow researchers to follow water as it courses through mountain landscapes. Previous studies by Williams and his research group showed high mountain groundwater in Colorado dominated by snowmelt can be locked underground for decades before emerging into downstream waterways. 鈥淭hese isotopic and geochemical measurements provide unique fingerprints, allowing a CSI-like approach to tracing water sources,鈥� said Williams.

Critical to the project is the university鈥檚 expertise in remote sensing research through NSIDC 鈥� including assessing changes in Earth鈥檚 snow and ice cover 鈥� and INSTAAR鈥檚 research on the physical, chemical and biological processes in 鈥渃ritical zones,鈥� which are the areas between treetops and groundwater. 听INSTAAR administers both the Long-Term Ecological Research site at Niwot Ridge west of Boulder and the Critical Zone Observatory project in the Boulder Creek watershed for the National Science Foundation.

One of the biggest project challenges will be to obtain data from some of the most remote regions on Earth, said Williams. The water, rain and snow samples collected by collaborators within the study area will be sent back to CU-Boulder for analysis.

The research will bring together scientists and government officials in the countries of High Asia to coordinate and compare results on what part of river flows come from glaciers and seasonal snow. This sharing of information is important because the rivers of Asia can cross several country borders.听 USAID support will contribute to the research and coordination and CU-Boulder will make its archived and new data on snow and ice easily available to all the countries and their citizens.

The CU team will hire Asian project managers and collaborate with research scientists affiliated with various Asian institutes. 鈥淲e already have some good scientific contacts in the region, people we know who are reliable and who can deliver,鈥� said Armstrong.

A number of CU undergraduate and graduate students will be involved in the study and support will be available to Asian students by way of the funding provided to Asian project partners.

鈥淥ne of the main project goals is to transfer scientific understanding to people in the region who can continue these measurements and analysis once the USAID project is finished,鈥� said Armstrong. 鈥淭he idea is to provide the local population with the information they need to make decisions that will increase sustainability as land use and climate change.鈥�

Jim Scott is science editor at the. See more on this story from听Inter Press Service. In a related story, read about a CU researcher鈥檚 study of Himalayan glacial lakes in听.