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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Sensitivity of AMSR-E Brightness Temperatures to the Seasonal Evolution of Lake Ice Thickness
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Sensitivity of AMSR-E Brightness Temperatures to the Seasonal Evolution of Lake Ice Thickness

机译:AMSR-E亮度温度对湖冰厚度季节变化的敏感性

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摘要

The sensitivity of brightness temperature $(T_{B})$ at 6.9, 10.7, and 18.7 GHz from Advanced Microwave Scanning Radiometer—Earth Observing System (AMSR-E) observations is investigated over five winter seasons (2002–2007) on Great Bear Lake and Great Slave Lake, Northwest Territories, Canada. The $T_{B}$ measurements are compared to ice thicknesses obtained with a previously validated thermodynamic lake ice model. Lake ice thickness is found to explain much of the increase of $T_{B}$ at 10.7 and 18.7 GHz. $T_{B}$ acquired at 18.7 GHz (V-pol) and 10.7 GHz (H-pol) shows the strongest relation with simulated lake ice thickness over the period of study $(R^{2} > 0.90)$. A comparison of the seasonal evolution of $T_{B}$ for a cold winter (2003–2004) and a warm winter (2005–2006) reveals that the relationship between $T_{B}$ and ice growth is stronger in the cold winter (2003–2004). Overall, this letter shows the high sensitivity of $T_{B}$ to ice growth and, thus, the potential of AMSR-E mid-frequency channels to estimate ice thickness on large northern lakes.
机译:在大熊熊的五个冬季(2002–2007年)中,研究了来自先进微波扫描辐射计-地球观测系统(AMSR-E)的亮度温度$(T_ {B})$在6.9、10.7和18.7 GHz的灵敏度湖和大奴湖,西北地区,加拿大。将$ T_ {B} $测量值与使用先前验证的热力学湖冰模型获得的冰厚进行比较。发现湖冰厚度解释了在10.7和18.7 GHz下$ T_ {B} $的增加。在研究期间$(R ^ {2}> 0.90)$,在18.7 GHz(V-pol)和10.7 GHz(H-pol)处获得的$ T_ {B} $与模拟的湖冰厚度之间存在最强的关系。比较寒冷的冬天(2003-2004年)和温暖的冬天(2005-2006年)$ T_ {B} $的季节性变化,可以发现在寒冷的季节,$ T_ {B} $和冰的生长之间的关系更强。冬季(2003年至2004年)。总体而言,这封信显示,$ T_ {B} $对冰的生长非常敏感,因此,AMSR-E中频频道具有估算北部大湖冰厚的潜力。

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