Significant increases in annual temperatures are having a devastating affect on glaciers in the mountainous regions of south-western China, potentially affecting natural habitats, tourism and wider economic development.
In a study published today, 25 October 2011, in IOP Publishing's Environmental Research Letters, scientists examined data from 111 weather stations across south-western China and have shown that temperature patterns were consistent with warming, at a statistically significant level, between 1961 and 2008.
Of the 111 stations examined, 77 per cent displayed statistically significant increases in annual temperature.
Collating a broad range of research on glaciers during this time period, the researchers, from the Chinese Academy of Sciences, identified three characteristics that were consistent with the increasing trend in temperature; drastic retreats were observed in the glacial regions, along with large losses of mass and an increase in the area of glacial lakes.
In the Pengqu basin of the Himalayas, for example, the 999 glaciers had a combined area loss of 131 km2 between 1970 and 2001, whilst the Yalong glacier in the Gangrigabu Mountains retreated over 1500 meters from 1980 to 2001.
The implications of these changes are far more serious than simply altering the landscape; glaciers are an integral part of thousands of ecosystems and play a crucial role in sustaining human populations.
Continued widespread melting of glaciers, caused by increasing temperatures, could potentially lead to floods, mudflows and rock falls, affecting traffic, tourism and wider economic development.
South-western China has 23,488 glaciers, covering an area of 29,523 km2 across the Himalayas and the Nyainqntanglha, Tanggula and Hengduan mountains.
As well as temperature, the researchers also investigated precipitation; however the results were less marked. Annual increasing precipitation is consistent with climate change and was observed in 53 per cent of the stations. A decrease in annual precipitation can also influence glacial retreat and this was observed in central regions of the Himalayas.
The lead author of this study, Dr Zongxing Li, said, "I think glacial loss is caused mainly by rises in temperature, especially in the high altitude regions. From the 14 weather stations above 4000 m, there was an annual mean temperature increase of 1.73 °C from 1961 to 2008.
"It is imperative we determine the relationship between climate change and glacier variations, particularly the role of precipitation, as the consequences of glacial retreat are far reaching."
From 25 October 2011, this paper can be downloaded in English from http://iopscience.iop.org/1748-9326/6/4/045404
Notes to Editors
1. For further information or a full draft of the journal paper, contact IOP Publishing Press Officer Michael Bishop:
Phone: 01179 301032
Climate and glacier change behaviour in southwestern China during the past several decades
2. The published version of the paper "Climate and glacier change behavious in southwestern China during the past several decades" (Zongxing Li, Yuanqing He, Wenling An, Linlin Song, Wei Zhang, Norm Catto, Yan Wang, Shijin Wang, Huancai Liu,Weihong Cao,Wilfred H Theakstone, Shuxin Wang and Jiankuo Du 2011 Environ. Res. Lett. 6 045404) will be freely available online from 25 October 2011. It will be available at http://iopscience.iop.org/1748-9326/6/4/045404
Environmental Research Letters
3. Environmental Research Letters is an open access journal that covers all of environmental science, providing a coherent and integrated approach including research articles, perspectives and editorials.
4. IOP Publishing provides publications through which leading-edge scientific research is distributed worldwide. IOP Publishing is central to the Institute of Physics (IOP), a not-for-profit society. Any financial surplus earned by IOP Publishing goes to support science through the activities of IOP. Beyond our traditional journals programme, we make high-value scientific information easily accessible through an ever-evolving portfolio of community websites, magazines, conference proceedings and a multitude of electronic services. Focused on making the most of new technologies, we're continually improving our electronic interfaces to make it easier for researchers to find exactly what they need, when they need it, in the format that suits them best. Go to http://publishing.iop.org/.
The Institute of Physics
5. The Institute of Physics is a leading scientific society promoting physics and bringing physicists together for the benefit of all.
It has a worldwide membership of around 40 000 comprising physicists from all sectors, as well as those with an interest in physics. It works to advance physics research, application and education; and engages with policymakers and the public to develop awareness and understanding of physics. Its publishing company, IOP Publishing, is a world leader in professional scientific communications. Go to www.iop.org
Environmental Research Letters