Although, in the tropics, glacier mass balance responds sensitively to changes in precipitation and humidity (see Lemke et al., 2007, Section 4.5.3), the fast glacier shrinkage of Chacaltaya is consistent with an ascent of the 0 °C isotherm of about 50 m / decade in the tropical Andes since the 1980s (Vuille et al., 2003), resulting in a corresponding rise in the equilibrium line of glaciers in the region (Coudrain et al., 2005). (ipcc.ch)
Based in this virtually ubiquitous relationship, we developed a methodology to estimate fields of isotherm depth from the SHA fields derived from satellite observations. (aoml.noaa.gov)
(a) Outline how physical factors affect the shape of the 4 °C isotherm in the River Severn estuary and valley north of Gloucester. (metlink.org)