Response sensitivities of a summer-accumulation type glacier to climate changes indicated with a glacier fluctuation model

URI http://harp.lib.hiroshima-u.ac.jp/it-hiroshima/metadata/9720
File
Title
Response sensitivities of a summer-accumulation type glacier to climate changes indicated with a glacier fluctuation model
Author
氏名 Naito Nozomu
ヨミ ナイトウ ノゾム
別名 内藤 望
氏名 Ageta Yutaka
ヨミ アゲタ ユタカ
別名
氏名 Nakawo Masayoshi
ヨミ ナカオ マサヨシ
別名
氏名 Edwin D. Waddington
ヨミ
別名
氏名 Charles F. Raymond
ヨミ
別名
氏名 Howard Conway
ヨミ
別名
Abstract

Sensitivities of a summer-accumulation type glacier in response to changes in air temperature and precipitation are investigated using a glacier fluctuation model. The model couples glacier dynamics to empirical mass balance equations obtained for a typical summer-accumulation type glacier in the eastern Nepal Himalayas. The geometry and seasonal variations in air temperature and precipitation are simplified in order to examine the principal characteristics of the sensitivities. The magnitude of the volume change and the volume response time are discussed and compared with those for a hypothetical winter-accumulation type glacier of equivalent geometry. The volume change of a summer-accumulation type glacier is roughly twice as large in its magnitude for an air temperature change as for an equally probable precipitation change in east Nepal. Moreover, the volume response time of the glacier is shorter for the temperature change than for the precipitation change. Accordingly, we suggest that air temperature changes rather than precipitation changes are mainly responsible for the fluctuations of summer-accumulation type glaciers in east Nepal, as long as the likelihood of future shifts in air temperature and precipitation scale with their modern standard deviations. The summer-accumulation type glacier responds more quickly to a temperature change than does the winter-accumulation type glacier, and its magnitude of the volume response is smaller for a precipitation change than the winter-accumulation type glacier. There is a significant shortening of the response time for increasing magnitude of glacier shrinkage.

Journal Title
Bulletin of glaciological research
Volume
18
Spage
1
Epage
8
Published Date
2001-03-01
Publisher
Japanese Society of Snow and Ice
ISSN
1345-3807
NCID
AA11582242
NAID
10015734930
Language
eng
NIIType
Journal Article
Text Version
Relation URL
Old URI
Set
it-hiroshima