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reference : Geodetic and direct mass-balance measurements: Comparison and joint analysis

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Geodetic and direct mass-balance measurements: comparison and joint analysis
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reftype Journal Article
Abstract This paper describes a new compilation of both direct and geodetic mass-balance measurements, develops a procedure to reduce diverse balance measurements over different time-spans to common time-spans, and presents updated estimates of global average balance of small glaciers based on the enlarged compilation. Although geodetic measurements are fewer than direct measurements, they cover four times as many balance years. Direct and geodetic measurements are unbiased with respect to one another, but differences are often substantial. The statistical procedure can be understood by imagining that an n-year balance measurement is an average of a series of 1 year measurements. The series is hypothetical but we can calculate the uncertainty of each of its elements if, in addition to its measured average, we can also estimate its standard deviation. For this claim to be valid, the annual series must be stationary and normally distributed with independent (roughly, uncorrelated) elements, for which there is reasonable evidence. The need to know the standard deviation means that annual direct measurements from a nearby glacier, or equally reliable information about variability, are indispensable. Given this information, the new methodology results in moderately more negative balances. This is probably because tidewater glaciers are better represented in the geodetic data. In any case, the most recent published estimate of global average balance, 0.8-1.0 mm a(-1) of sea-level equivalent for 2001-04, is now increased substantially to 1.1-1.4 mm a(-1) for 2001-05.
Accession Number WOS:000279990100015
Author Cogley, J. G.
DOI 10.3189/172756409787769744
Date 2009
ISSN 0260-3055
Issue 50
Journal Annals of Glaciology
Notes Times Cited: 41
Pages 96-100
Title Geodetic and direct mass-balance measurements: Comparison and joint analysis
Volume 50
Year 2009
Bibliographic identifiers
.reference_type 0
_chapter ["Appendix 3: Climate Science FINAL"]
_record_number 753
_uuid e941c8c5-8433-42c0-aa28-09c8737053ac