Differentiation between melt and freeze stages of the melt cycle using SSM/I channel ratios

被引:12
作者
Ashcraft, IS [1 ]
Long, DG [1 ]
机构
[1] Brigham Young Univ, Ctr Remote Sensing, Provo, UT 84602 USA
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2005年 / 43卷 / 06期
关键词
brightness temperature; freeze/thaw; Greenland melt detection; Special Sensor Microwave Imager (SSM/I);
D O I
10.1109/TGRS.2005.845642
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Microwave remote sensing detection of snow melt and ablation generally focuses on the detection of liquid moisture in the snow-pack. For ablation estimation, it is important to determine if wet snow is in the process of melting or freezing. The different stages of the melt cycle are observed in the diurnal variation of T-b measurements from the Special Sensor Microwave Imager (SSM/I) over Greenland. SSM/I channel ratios exhibit patterns indicating that they are sensitive to melt and freeze stages of the daily melt cycle. The horizontal to vertical polarization ratio is sensitive to surface wetness associated with melting. The 19-37-GHz frequency ratio is sensitive to a frozen surface layer over wet snow which is associated with the freeze stage of the melt cycle. These observations are supported by conceptual models presented here and in in situ measurements from other investigators.
引用
收藏
页码:1317 / 1323
页数:7
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