Precipitation regimes over central Greenland inferred from 5 years of ICECAPS observations
Precipitation regimes over central Greenland inferred from 5 years of ICECAPS observations
复制标题
根据 ICECAPS 五年观测推断的格陵兰中部降水情况
DOI：
10.5194/acp-18-4715-2018
复制
发表时间：
2017
影响因子：
6.3
通讯作者：
V. Walden
中科院分区：
文献类型：
--
作者：
C. Pettersen;R. Bennartz;A. Merrelli;M. Shupe;D. Turner;V. Walden
抽象。提出了一种利用地面遥感器对北极降水进行分类的新方法。利用云液态水和冰的微波吸收和散射特性的光谱变化的差异，这种方法可以区分不同类型的降雪事件，这取决于产生降水的云中是否存在冷凝液态水。分类揭示了两个不同的，主要制度的格陵兰冰盖（GIS）的降水：一个来自完全冰川化的冰云和其他来自混合相云。来自能量、云、大气状态和峰会降水综合表征（ICECAPS）的五年同位多仪器数据被用来研究与每个降水制度相关的云和气象特性和模式。确定和量化的降水制度的发生和积累。ICECAPS其他仪器的云和降水观测说明了每个制度的不同特征。此外，再分析产品和后向轨迹分析表明，不同的天气尺度强迫与每个制度。降水在中央GIS表现出独特的微物理特性，由于高的表面海拔以及连接到特定的大尺度流动模式。降雪起源于冰云耦合到深，锋面云系平流和格陵兰岛东南海岸的中央地理信息系统。这些事件似乎与巴芬湾和格陵兰岛背风气旋生成的低压所产生的个别风暴系统有关。源自混合相云的降雪较浅，具有典型的过冷云液态水层特征，并从格陵兰岛南部和西南部沿着GIS上方的静止流缓慢传播。
Abstract. A novel method for classifying Arctic precipitation using ground based remote sensors is presented. Using differences in the spectral variation of microwave absorption and scattering properties of cloud liquid water and ice, this method can distinguish between different types of snowfall events depending on the presence or absence of condensed liquid water in the clouds that generate the precipitation. The classification reveals two distinct, primary regimes of precipitation over the Greenland Ice Sheet (GIS): one originating from fully glaciated ice clouds and the other from mixed-phase clouds. Five years of co-located, multi-instrument data from the Integrated Characterization of Energy, Clouds, Atmospheric state, and Precipitation at Summit (ICECAPS) are used to examine cloud and meteorological properties and patterns associated with each precipitation regime. The occurrence and accumulation of the precipitation regimes are identified and quantified. Cloud and precipitation observations from additional ICECAPS instruments illustrate distinct characteristics for each regime. Additionally, reanalysis products and back-trajectory analysis show different synoptic-scale forcings associated with each regime. Precipitation over the central GIS exhibits unique microphysical characteristics due to the high surface elevations as well as connections to specific large-scale flow patterns. Snowfall originating from the ice clouds is coupled to deep, frontal cloud systems advecting up and over the southeast Greenland coast to the central GIS. These events appear to be associated with individual storm systems generated by low pressure over Baffin Bay and Greenland lee cyclogenesis. Snowfall originating from mixed-phase clouds is shallower and has characteristics typical of supercooled cloud liquid water layers, and slowly propagates from the south and southwest of Greenland along a quiescent flow above the GIS.
地面无源微波辐射计测量中的雪散射信号
DOI：
10.1029/2010jd013856
发表时间：
2010
期刊：
影响因子：
--
作者：
Kneifel;U. Löhnert;A. Battaglia;S. Crewell;D. Siebler
通讯作者：
D. Siebler
影响因子：
--
作者：
S. Kneifel;M. Kulie;R. Bennartz
通讯作者：
S. Kneifel;M. Kulie;R. Bennartz