Past and future mass balance of ‘Ka Roimata o Hine Hukatere’ Franz Josef Glacier, New Zealand

Anderson, Brian; Lawson, Wendy; Owens, I. F.; Goodsell, Becky

doi:10.3189/172756506781828449

Cited by 88 publications

(78 citation statements)

References 28 publications

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“…Cook: Franz Josef, Fox, Tasman and Murchison glaciers. Franz Josef and Fox glacier are located on the west side of the mountain divide and consequently receive large amounts of accumulation due to the large eastwest precipitation gradient (Fitzharris et al, 1999) and experience high magnitudes of ablation (Anderson et al, 2006). These glaciers are generally quite steep with rather short response times (Oerlemans et al, 2005).…”

Section: Results I: New Zealand Case Studymentioning

confidence: 99%

Co-registration and bias corrections of satellite elevation data sets for quantifying glacier thickness change

2011

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Abstract.There are an increasing number of digital elevation models (DEMs) available worldwide for deriving elevation differences over time, including vertical changes on glaciers. Most of these DEMs are heavily post-processed or merged, so that physical error modelling becomes difficult and statistical error modelling is required instead. We propose a three-step methodological framework for assessing and correcting DEMs to quantify glacier elevation changes: (i) remove DEM shifts, (ii) check for elevation-dependent biases, and (iii) check for higher-order, sensor-specific biases. A simple, analytic and robust method to co-register elevation data is presented in regions where stable terrain is either plentiful (case study New Zealand) or limited (case study Svalbard). The method is demonstrated using the three global elevation data sets available to date, SRTM, ICESat and the ASTER GDEM, and with automatically generated DEMs from satellite stereo instruments of ASTER and SPOT5-HRS. After 3-D co-registration, significant biases related to elevation were found in some of the stereoscopic DEMs. Biases related to the satellite acquisition geometry (along/cross track) were detected at two frequencies in the automatically generated ASTER DEMs. The higher frequency bias seems to be related to satellite jitter, most apparent in the backlooking pass of the satellite. The origins of the more significant lower frequency bias is uncertain. ICESat-derived elevations are found to be the most consistent globally available elevation data set available so far. Before performing regional-scale glacier elevation change studies or mosaicking DEMs from multiple individual tiles (e.g. ASTER GDEM), we recommend to co-register all elevation data to ICESat as a global vertical reference system.

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Section: Results I: New Zealand Case Studymentioning

confidence: 99%

Co-registration and bias corrections of satellite elevation data sets for quantifying glacier thickness change

2011

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“…Both glaciers were here chosen as case studies due to their short reaction times and thus potentially nonlinear elevation development, and due to the good availability of ASTER stereo data. Franz Josef and Fox Glaciers are very maritime with assumed precipitation rates of up to 12 m· w.e.a −1 [19][20][21][22]. Ablation at the tongues is substantial at all seasons with a mean summer ablation of ~130 mm· d −1 and a mean winter ablation of ~20 mm· d −1 , i.e., several tens of meters as annual sum [23].…”

Section: Study Areamentioning

confidence: 99%

Modeling Glacier Elevation Change from DEM Time Series

Wang

Kääb

2015

Remote Sensing

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“…Lorrey et al, 2007). While a change in precipitation phase and the associated albedo feedback has been shown to be an important component of the sensitivity of SMB to air temperature in New Zealand as in other glaciated regions (Oerlemans 1997;Anderson et al, 2006), there is a suggestion that increased turbulent (mainly sensible) heat fluxes dominate variations in melt (Anderson et al, 2010). This has led some authors to interpret past glacier fluctuations as a linear and direct proxy for regional air temperature (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The large barrier the Southern Alps poses to the prevailing winds creates a high precipitation environment, which, coupled to the relatively low elevation of glacier termini (Hoelzle et al, 2007), creates high mass turnover glaciers that have shown high sensitivity to climatic variations in temperature-index glacier modelling studies (Anderson et al, 2006;Oerlemans, 2010). For these reasons the glaciers of the Southern Alps are seen as useful indicators of regional atmospheric circulation in the southwest Pacific and form a vital component of palaeoclimate work (e.g.…”

Section: Introductionmentioning

confidence: 99%

Cloud effects on surface energy and mass balance in the ablation area of Brewster Glacier, New Zealand

Conway

Cullen

2016

The Cryosphere

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Abstract. The effect of clouds on glacier surface energy balance (SEB) has received increased attention in the last decade, but how clouds interact with other meteorological forcing to influence surface mass balance (SMB) is not as well understood. This paper resolves the SEB and SMB at a site in the ablation zone of Brewster Glacier over a 22-month period, using high-quality radiation data to carefully evaluate SEB terms and define clear-sky and overcast conditions. A fundamental change in glacier SEB in cloudy conditions was driven by increased effective sky emissivity and surface vapour pressure, rather than a minimal change in air temperature and wind speed. During overcast conditions, positive net long-wave radiation and latent heat fluxes allowed melt to be maintained through a much greater length of time compared to clear-sky conditions, and led to similar melt in each sky condition. The sensitivity of SMB to changes in air temperature was greatly enhanced in overcast compared to clear-sky conditions due to more frequent melt and changes in precipitation phase that created a strong albedo feedback. During the spring and autumn seasons, the sensitivity during overcast conditions was strongest. To capture these processes, future attempts to explore glacier-climate interactions should aim to resolve the effects of atmospheric moisture (vapour, cloud, and precipitation) on melt as well as accumulation, through enhanced statistical or physically based methods.

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Past and future mass balance of ‘Ka Roimata o Hine Hukatere’ Franz Josef Glacier, New Zealand

Cited by 88 publications

References 28 publications

Co-registration and bias corrections of satellite elevation data sets for quantifying glacier thickness change

Co-registration and bias corrections of satellite elevation data sets for quantifying glacier thickness change

Modeling Glacier Elevation Change from DEM Time Series

Cloud effects on surface energy and mass balance in the ablation area of Brewster Glacier, New Zealand

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