...
首页> 外文期刊>The Cryosphere Discussions >Quantifying the snowmelt–albedo feedback at Neumayer Station, East Antarctica
【24h】

Quantifying the snowmelt–albedo feedback at Neumayer Station, East Antarctica

机译:量化南极东部诺马耶站的融雪-反照率反馈

获取原文
           

摘要

We use 24?years (1992–2016) of high-quality meteorological observations at Neumayer Station, East Antarctica, to force a surface energy balance model. The modelled 24-year cumulative surface melt at Neumayer amounts to 1154?mm water equivalent (w.e.), with only a small uncertainty ( ±3 mm?w.e.) from random measurement errors. Results are more sensitive to the chosen value for the surface momentum roughness length and new snow density, yielding a range of 900–1220?mm?w.e. Melt at Neumayer occurs only in the months November to February, with a summer average of 50?mm?w.e. and large interannual variability ( σ=42 mm?w.e.). This is a small value compared to an annual average (1992–2016) accumulation of 415±86 mm?w.e. Absorbed shortwave radiation is the dominant driver of temporal melt variability at Neumayer. To assess the importance of the snowmelt–albedo feedback we include and calibrate an albedo parameterisation in the surface energy balance model. We show that, without the snowmelt–albedo feedback, surface melt at Neumayer would be approximately 3?times weaker, demonstrating how important it is to correctly represent this feedback in model simulations of surface melt in Antarctica.
机译:我们使用南极东部Neumayer站24年(1992-2016年)的高质量气象观测值来建立表面能平衡模型。在Neumayer建模的24年累积表面融化量相当于1154?mm水当量(w.e.),而随机测量误差只有很小的不确定性(±3 mm?w.e。)。结果对所选的表面动量粗糙度长度和新的雪密度值更敏感,得出的范围为900–1220?mm?w.e。 Neumayer的融化仅发生在11月到2月的几个月中,夏季平均为50?mm?w。和较大的年际变化(σ= 42 mm?w.e。)。与年平均(1992-2016)415±86 mm?w.e.e相比,这是一个很小的值。吸收的短波辐射是Neumayer熔体随时间变化的主要驱动因素。为了评估融雪-反照率反馈的重要性,我们在表面能平衡模型中包括并校准了反照率参数。我们表明,如果没有融雪-反照率的反馈,诺伊迈尔的表面融化将弱大约3倍,这说明在南极洲表面融化的模型模拟中正确表示这种反馈的重要性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号