Abstract

The Patagonia Icefields (PIF) are the largest non-polar ice mass in the southern hemisphere. The icefields cover an area of approximately 16,500 km(2) and are divided into the northern and southern icefields, which are similar to 4000 km(2) and similar to 12,500 km(2), respectively. While both icefields have been losing mass rapidly, their responsiveness to various climate drivers, such as the El Nino-Southern Oscillation, is not well understood. Using the elastic response of the earth to loading changes and continuous GPS data we separated and estimated ice mass changes observed during the strong El Nino that started in 2015 from the complex hydrological interactions occurring around the PIF. During this single event, our mass balance estimates show that the northern icefield lost similar to 28 Gt of mass while the southern icefield lost similar to 12 Gt. This is the largest ice loss event in the PIF observed to date using geodetic data.