Determination of the snow accumulation rate from satellite remote sensing by means of combining high resolution densitiy data and microwave images at low frequencies

绘制极地冰盖质量变化的地图对于计算未来海平面的发展至关重要，并且需要了解冰盖表面的雪密度变化。最近的相关性研究的密度变化内的积雪意味着之间的连接的积累率，物理结构的积雪和亮温卫星传感器。在拟议的项目范围内，对最近从南极几个区域获得的高分辨率密度剖面图进行统计分析，将有助于确定微波发射对密度变化敏感的长度尺度。将不同长度尺度的分层统计数据与累积速率相关联，不仅可以将累积速率与积雪的物理性质联系起来，而且可以从微波图像中确定累积速率。对项目期间实地考察获得的雪芯进行检查，将能够系统地研究先前通过微波图像分析确定的雪类的特征分层特征。

Mapping the mass changes of the polar ice sheets is crucial for computing future sea level development and requires knowledge of snow density variations at the ice sheet’s surface. Recent correlation studies of density variations within the firn imply a connection between the accumulation rate, the physical structure of the firn and the brightness temperature by satellite sensors. Within the proposed project the statistical analysis of recently available high resolution density profiles from several regions of Antarctica will lead to the determination of length scales at which microwave emission is sensitive to density variations. Correlating the layering statistics at different length scales to accumulation rates may offer the possibility not only to link accumulation rates to physical firn properties, but to determine accumulation rates from microwave images. An examination of firn cores obtained from field expeditions during the project duration will allow the systematic study of characteristic layering features of snow classes, which have been previously defined by microwave image analysis.