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In New Zealand, direct measurements of mass balance are sparse due to the\udinaccessibility of glaciers in the Southern Alps and the logistical\uddifficulties associated with maintaining a mass balance record. In order to\udexplore the benefit of remotely sensed imaging to monitor mass balance in the\udSouthern Alps, this research assesses the relationship between measurements\udof glacier surface albedo derived from Moderate Resolution Imaging\udSpectroradiometer (MODIS) and mass balance observations using the\udglaciological method on Brewster Glacier over the 2005–2013 period. We\udconfirm that minimum glacier-wide albedo is a reliable predictor for annual\udmass balance in this maritime environment (R2 = 0.93). Furthermore, we\udshow that regular monitoring of glacier-wide albedo enables a new metric of\udwinter accumulation to be derived, namely the cumulative winter albedo, which\udis found to correlate strongly with winter mass balance (R2 = 0.88),\udthus enabling the reconstruction of separate winter and summer mass balance\udrecords. This allows the mass balance record for Brewster Glacier to be\udextended back to the start of MODIS observations in 2000 and to confirm that\udthe annual balance of Brewster Glacier is largely controlled by summer\udbalance (R2  =  92 %). An application of the extended record is\udproposed whereby the relationship between mass balance and the photographic\udrecord of the end-of-summer snowline altitude is assessed. This allowed the\udannual balance record of Brewster Glacier to be reconstructed over the period\ud1977–2013, thus providing the longest record of mass balance for a glacier\udin New Zealand. Over the 37-year period, our results show that Brewster\udGlacier gained a significant mass of up to 14.5 ± 2.7 m w.e. by 2007.\udThis gain was offset by a marked shift toward negative balances after 2008,\udyielding a loss of 5.1 ± 1.2 m w.e., or 35 % of the gain\udaccumulated over the previous 30 years. The good correspondence between mass\udbalance of Brewster Glacier and the phase of the Pacific (Inter-)Decadal\udOscillation (PDO/IPO), associated with the fast terminus retreat observed\udbetween 1978 and 1998, strongly suggests that the observed mass gain of Brewster\udGlacier since 1977 is only offsetting a longer sequence of dominantly\udnegative balances

Reconstructing the mass balance of Brewster Glacier, New Zealand, using MODIS-derived glacier-wide albedo