Annual mass balances of 'reference' glaciers with more than 30 continued observation years. Mass balance values are given on the left y-axis in the unit meter water equivalent per year (m w.e. a-1). A value of -1.0 m w.e. a-1 corresponds to an annual glacier-wide ice thickness loss of about 1.1 meter. Global values are calculated using only one single value (averaged) for each of 19 mountain regions in order to avoid a bias to well observed regions. The number of 'reference' glaciers with reported data is given on the right y-axis. Note that extreme values before 1960 and in 2015 need to be taken with reservation because of the limited sample size.

Source: WGMS (2015, and earlier reports)

Reference: WGMS (2015): Global Glacier Change Bulletin No. 1 (2012–2013). Zemp, M., Gärtner-Roer, I., Nussbaumer, S. U., Hüsler, F., Machguth, H., Mölg, N., Paul, F., and Hoelzle, M. (eds.), ICSU(WDS)/IUGG(IACS)/UNEP/UNESCO/WMO, World Glacier Monitoring Service, Zurich, Switzerland, 230 pp., publication based on database version: doi:10.5904/wgms-fog-2015-11.


Cumulative annual mass balances of 'reference' glaciers with more than 30 continued observation years. Cumulative mass balance values relativ to 1970 are given on the left y-axis in the unit meter water equivalent (m w.e.). A value of -10 m w.e. corresponds to a cumulative glacier-wide ice thickness loss of about 11 meters since 1970. Global values are calculated using only one single value (averaged) for each of 19 mountain regions in order to avoid a bias to well observed regions. Note that extreme values before 1960 and in 2015 need to be taken with reservation because of the limited sample size.

Source: WGMS (2015, and earlier reports)

Reference: WGMS (2015): Global Glacier Change Bulletin No. 1 (2012–2013). Zemp, M., Gärtner-Roer, I., Nussbaumer, S. U., Hüsler, F., Machguth, H., Mölg, N., Paul, F., and Hoelzle, M. (eds.), ICSU(WDS)/IUGG(IACS)/UNEP/UNESCO/WMO, World Glacier Monitoring Service, Zurich, Switzerland, 230 pp., publication based on database version: doi:10.5904/wgms-fog-2015-11.


Cumulative annual mass balances of 'reference' glaciers with more than 30 continued observation years. Cumulative mass balance values relativ to 1970 are given on the left y-axis in the unit meter water equivalent (m w.e.). A value of -10 m w.e. corresponds to a cumulative glacier-wide ice thickness loss of about 11 meters since 1970. Global values are calculated using only one single value (averaged) for each of 19 mountain regions in order to avoid a bias to well observed regions. Note that extreme values before 1960 and in 2015 need to be taken with reservation because of the limited sample size.

Source: WGMS (2015, and earlier reports)

Reference: WGMS (2015): Global Glacier Change Bulletin No. 1 (2012–2013). Zemp, M., Gärtner-Roer, I., Nussbaumer, S. U., Hüsler, F., Machguth, H., Mölg, N., Paul, F., and Hoelzle, M. (eds.), ICSU(WDS)/IUGG(IACS)/UNEP/UNESCO/WMO, World Glacier Monitoring Service, Zurich, Switzerland, 230 pp., publication based on database version: doi:10.5904/wgms-fog-2015-11.