气候变化领域集成服务门户(CCPortal): Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers

CCPortal

DOI	10.5194/tc-10-535-2016
	Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers
	Andreassen L.M.; Elvehøy H.; Kjøllmoen B.; Engeset R.V.
发表日期	2016
ISSN	19940416
卷号	10 期号:2
英文摘要	Glaciological and geodetic methods provide independent observations of glacier mass balance. The glaciological method measures the surface mass balance, on a seasonal or annual basis, whereas the geodetic method measures surface, internal, and basal mass balances, over a period of years or decades. In this paper, we reanalyse the 10 glaciers with long-term mass-balance series in Norway. The reanalysis includes (i) homogenisation of both glaciological and geodetic observation series, (ii) uncertainty assessment, (iii) estimates of generic differences including estimates of internal and basal melt, (iv) validation, and, if needed, (v) calibration of mass-balance series. This study comprises an extensive set of data (484 mass-balance years, 34 geodetic surveys, and large volumes of supporting data, such as metadata and field notes). In total, 21 periods of data were compared and the results show discrepancies between the glaciological and geodetic methods for some glaciers, which are attributed in part to internal and basal ablation and in part to inhomogeneity in the data processing. Deviations were smaller than 0.2 m w.e. a-1 for 12 out of 21 periods. Calibration was applied to 7 out of 21 periods, as the deviations were larger than the uncertainty. The reanalysed glaciological series shows a more consistent signal of glacier change over the period of observations than previously reported: six glaciers had a significant mass loss (14-22 m w.e.) and four glaciers were nearly in balance. All glaciers have lost mass after the year 2000. More research is needed on the sources of uncertainty to reduce uncertainties and adjust the observation programmes accordingly. The study confirms the value of carrying out independent high-quality geodetic surveys to check and correct field observations. © 2016 Author(s).
学科领域	ablation; calibration; data processing; geodesy; glacier mass balance; glaciology; inhomogeneity; meltwater; Norway
语种	英语
scopus关键词	ablation; calibration; data processing; geodesy; glacier mass balance; glaciology; inhomogeneity; meltwater; Norway
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119692
作者单位	Section for Glaciers, Ice and Snow, Norwegian Water Resources and Energy Direct. (NVE), Oslo, Norway
推荐引用方式 GB/T 7714	Andreassen L.M.,Elvehøy H.,Kjøllmoen B.,et al. Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers[J],2016,10(2).
APA	Andreassen L.M.,Elvehøy H.,Kjøllmoen B.,&Engeset R.V..(2016).Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers.Cryosphere,10(2).
MLA	Andreassen L.M.,et al."Reanalysis of long-term series of glaciological and geodetic mass balance for 10 Norwegian glaciers".Cryosphere 10.2(2016).