Retrieval of Snow Depth on Arctic Sea Ice From Surface‐Based, Polarimetric, Dual‐Frequency Radar Altimetry-猫眼课题宝

DOI：

10.1029/2023gl104461

发表时间：

2023-10

期刊：

Geophysical Research Letters

影响因子：

5.2

通讯作者：

中科院分区：

地球科学1区

文献类型：

作者：

R. Willatt;J. Stroeve;V. Nandan;Thomas Newman;R. Mallett;Stefan Hendricks;R. Ricker;James Mead;P. Itkin;R. Tonboe;D. Wagner;G. Spreen;G. Liston;M. Schneebeli;D. Krampe;M. Tsamados;O. Demir;Jeremy Wilkinson;Matthias Jaggi;Lu Zhou;M. Huntemann;Ian A. Raphael;Arttu Jutila;M. Oggier

海冰上的积雪深度是一个重要的气候变量，也是卫星测高得出的海冰厚度不确定性的主要来源。在MOSAiC远征的冬季，“KuKa”双频，全极化Ku和Ka波段雷达以“凝视”最低点模式部署，以研究结合这两种频率来检索雪深的可能性。研究了三种方法：双频，双极化和波形，并与独立的雪深测量进行了比较。新型双极化方法产生的r2值高达0.77。平均积雪深度在1 cm范围内一致，即使数据子带到CryoSat-2 SIRAL和SARAL AltiKa带宽。来自同极化双频方法的雪深至少是四分之一太小，r2为0.15或更低。波形技术的R2达到0.72，但深度被低估。因此，使用偏振信息或波形形状的雪深检索可能可以通过机载/卫星雷达高度计进行。

Snow depth on sea ice is an Essential Climate Variable and a major source of uncertainty in satellite altimetry‐derived sea ice thickness. During winter of the MOSAiC Expedition, the “KuKa” dual‐frequency, fully polarized Ku‐ and Ka‐band radar was deployed in “stare” nadir‐looking mode to investigate the possibility of combining these two frequencies to retrieve snow depth. Three approaches were investigated: dual‐frequency, dual‐polarization and waveform shape, and compared to independent snow depth measurements. Novel dual‐polarization approaches yielded r2 values up to 0.77. Mean snow depths agreed within 1 cm, even for data sub‐banded to CryoSat‐2 SIRAL and SARAL AltiKa bandwidths. Snow depths from co‐polarized dual‐frequency approaches were at least a factor of four too small and had a r2 0.15 or lower. r2 for waveform shape techniques reached 0.72 but depths were underestimated. Snow depth retrievals using polarimetric information or waveform shape may therefore be possible from airborne/satellite radar altimeters.

Retrieval of Snow Depth on Arctic Sea Ice From Surface‐Based, Polarimetric, Dual‐Frequency Radar Altimetry

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