DOI: 10.5194/tc-10-313-2016
Scopus记录号: 2-s2.0-84958961751
论文题名: Cloud effects on surface energy and mass balance in the ablation area of Brewster Glacier, New Zealand
作者: Conway J ; P ; , Cullen N ; J
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 1 起始页码: 313
结束页码: 328
语种: 英语
英文关键词: ablation
; air temperature
; albedo
; atmospheric forcing
; atmospheric moisture
; climate conditions
; climate effect
; emissivity
; energy balance
; latent heat flux
; mass balance
; precipitation (climatology)
; sensitivity analysis
; surface energy
; Brewster Glacier
; New Zealand
; South Island
; West Coast [South Island]
英文摘要: The effect of clouds on glacier surface energy balance (SEB) has received increased attention in the last decade, but how clouds interact with other meteorological forcing to influence surface mass balance (SMB) is not as well understood. This paper resolves the SEB and SMB at a site in the ablation zone of Brewster Glacier over a 22-month period, using high-quality radiation data to carefully evaluate SEB terms and define clear-sky and overcast conditions. A fundamental change in glacier SEB in cloudy conditions was driven by increased effective sky emissivity and surface vapour pressure, rather than a minimal change in air temperature and wind speed. During overcast conditions, positive net long-wave radiation and latent heat fluxes allowed melt to be maintained through a much greater length of time compared to clear-sky conditions, and led to similar melt in each sky condition. The sensitivity of SMB to changes in air temperature was greatly enhanced in overcast compared to clear-sky conditions due to more frequent melt and changes in precipitation phase that created a strong albedo feedback. During the spring and autumn seasons, the sensitivity during overcast conditions was strongest. To capture these processes, future attempts to explore glacier-climate interactions should aim to resolve the effects of atmospheric moisture (vapour, cloud, and precipitation) on melt as well as accumulation, through enhanced statistical or physically based methods. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75190
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geography, University of Otago, Dunedin, New Zealand; Centre for Hydrology, University of Saskatchewan, Saskatoon, Canada
Recommended Citation:
Conway J,P,, Cullen N,et al. Cloud effects on surface energy and mass balance in the ablation area of Brewster Glacier, New Zealand[J]. Cryosphere,2016-01-01,10(1)