Inferring the variation of climatic and glaciological contributions to West Greenland iceberg discharge in the twentieth century

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dc.contributor.authorZhao, Yifan
dc.contributor.authorBigg, Grant R.
dc.contributor.authorBillings, Steve A.
dc.contributor.authorHanna, Edward
dc.contributor.authorSole, Andrew J.
dc.contributor.authorWei, Hua-Liang
dc.contributor.authorKadirkamanathan, Visakan
dc.contributor.authorWilton, David J.
dc.date.accessioned2016-08-24T13:41:27Z
dc.date.available2016-08-24T13:41:27Z
dc.date.issued2016-08-17
dc.description.abstractIceberg discharge is a major component of the mass balance of the Greenland Ice Sheet (GrIS). While bulk estimates of discharge variation over time exist, inferred remotely from measurements of grounding line ice velocities or surface mass balance calculations, few detailed measurements of discharge itself from individual marine-terminating glaciers existed until recent years. Recently, it has been shown, through a combination of ocean–iceberg modelling and non-linear system identification, that the century-long record of iceberg numbers crossing 48oN in the West Atlantic is a good first-order proxy for discharge from at least south and west Greenland. Here, we explore the varying relative importance of ice sheet, oceanic and climatic forcing of iceberg discharge from these areas over the twentieth century, by carrying out sensitivity studies of a non-linear auto-regressive mathematical model of the 48oN time series. We find that the relationships are mainly non-linear, with the contribution of the GrIS surface mass balance to iceberg discharge likely to be dominant in the first half of the century. This period is followed by several decades where oceanic temperature effects are most important in determining the model variation in iceberg discharge. In recent decades, all physical processes play a non-negligible part in explaining the iceberg discharge and the model suggests that the glacial response time to environmental changes may have decreaseden_UK
dc.identifier.citationYifan Zhao, Grant R. Bigg, Steve A. Billings, et al., Inferring the variation of climatic and glaciological contributions to West Greenland iceberg discharge in the twentieth century. Cold Regions Science and Technology, Volume 121, January 2016, pp. 167-178en_UK
dc.identifier.issn0165-232X
dc.identifier.urihttp://dx.doi.org/10.1016/j.coldregions.2015.08.006
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/10421
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectGreenlanden_UK
dc.subjectIcebergen_UK
dc.subjectIce sheeten_UK
dc.subjectOcean temperatureen_UK
dc.subjectClimateen_UK
dc.subjectSystems modellingen_UK
dc.titleInferring the variation of climatic and glaciological contributions to West Greenland iceberg discharge in the twentieth centuryen_UK
dc.typeArticleen_UK

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