气候变化领域集成服务门户(CCPortal): Understanding drivers of glacier-length variability over the last millennium

CCPortal

DOI	10.5194/tc-15-1645-2021
	Understanding drivers of glacier-length variability over the last millennium
	Huston A.; Siler N.; Roe G.H.; Pettit E.; Steiger N.J.
发表日期	2021
ISSN	19940416
起始页码	1645
结束页码	1662
卷号	15 期号:3
英文摘要	Changes in glacier length reflect the integrated response to local fluctuations in temperature and precipitation resulting from both external forcing (e.g., volcanic eruptions or anthropogenic CO2) and internal climate variability. In order to interpret the climate history reflected in the glacier moraine record, the influence of both sources of climate variability must therefore be considered. Here we study the last millennium of glacier-length variability across the globe using a simple dynamic glacier model, which we force with temperature and precipitation time series from a 13-member ensemble of simulations from a global climate model. The ensemble allows us to quantify the contributions to glacier-length variability from external forcing (given by the ensemble mean) and internal variability (given by the ensemble spread). Within this framework, we find that internal variability is the predominant source of length fluctuations for glaciers with a shorter response time (less than a few decades). However, for glaciers with longer response timescales (more than a few decades) external forcing has a greater influence than internal variability. We further find that external forcing also dominates when the response of glaciers from widely separated regions is averaged. Singleforcing simulations indicate that, for this climate model, most of the forced response over the last millennium, preanthropogenic warming, has been driven by global-scale temperature change associated with volcanic aerosols. © 2019 EDP Sciences. All rights reserved.
英文关键词	aerosol; ensemble forecasting; glacier; global climate; moraine; numerical model; precipitation (climatology); simulation; time series
语种	英语
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/202335
作者单位	College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Institute of Earth Sciences, Hebrew University, Jerusalem, Israel; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
推荐引用方式 GB/T 7714	Huston A.,Siler N.,Roe G.H.,et al. Understanding drivers of glacier-length variability over the last millennium[J],2021,15(3).
APA	Huston A.,Siler N.,Roe G.H.,Pettit E.,&Steiger N.J..(2021).Understanding drivers of glacier-length variability over the last millennium.Cryosphere,15(3).
MLA	Huston A.,et al."Understanding drivers of glacier-length variability over the last millennium".Cryosphere 15.3(2021).