File:Glacier Mass Balance vectorCS.svg
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English: This figure shows the average rate of thickness change in mountain glaciers around the world. This information, known as the glaciological mass balance, is found by measuring the annual snow accumulation and subtracting surface ablation driven by melting, sublimation, or wind erosion. These measurements do not account for thinning associated with iceberg calving, flow related thinning, or subglacial erosion. All values are corrected for variations in snow and firn density and expressed in meters of water equivalent (Dyurgerov 2002).
Measurements are shown as both the annual average thickness change and the accumulated change during the fifty years of measurements presented. Years with a net increase in glacier thickness are plotted upwards and in red; years with a net decrease in glacier thickness (i.e. positive thinning) are plotted downward and in blue. Only three years in the last 50 have experienced thickening in the average. Systematic measurements of glacier thinning began in the 1940s, but fewer than 15 sites had been measured each year until the late 1950s. Since then more than 100 sites have contributed to the average in some years (Dyurgerov 2002, Dyurgerov and Meier 2005). Error bars indicate the standard error in the mean. Other observations, based on glacier length records, suggest that glacier retreat has occurred nearly continuously since the early 1800s and the end of the little ice age, but variations in rate have occurred, including a significant acceleration during the twentieth century that is believed to have been a response to global warming (Oerlemans 2005).Čeština: Tento obrázek ukazuje průměrnou rychlost změny tloušťky v horských ledovců po celém světě. Tato informace, známá jako hmotnostní bilance ledovce, se zjistí měřením roční sněhové akumulace a odečtením ablace poháněné táním, sublimací nebo větrnou erozí. Tato měření nezohledňují ztenčení spojené telením ledovců , ztenčením souvisejícím s toky nebo subglaciální erozí. Všechny hodnoty jsou korigovány na změny sněhu a hustoty firnu a jsou vyjádřeny v metrech ekvivalentu vody (Dyurgerov 2002).
Měření jsou zobrazena jako roční průměrná změna tloušťky a kumulovaná změna během padesáti let prezentovaných měření. Roky s čistým nárůstem tloušťky ledovce jsou vyneseny nahoru a červeně; roky s čistým poklesem tloušťky ledovce (tj. kladní ztenčení) jsou vyneseny dolů a jsou modré. Pouze tři roky za posledních 50 let zaznamenaly v průměru nárůst. |
| Date | |
| Source | Own work |
| Author | Pavouk , translated from File:Glacier Mass Balance vector.svg: Original figure was prepared by Robert A. Rohde from published data and is part of the Global Warming Art project. |
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| current | 19:38, 4 December 2020 | | 823 × 625 (92 KB) | Pavouk (talk | contribs) | Uploaded own work with UploadWizard |
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