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首页> 外文期刊>Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of >Variability of the East Greenland Current in Fram Strait From Subdaily COSMO-SkyMed X-SAR Imagery
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Variability of the East Greenland Current in Fram Strait From Subdaily COSMO-SkyMed X-SAR Imagery

机译：次日COSMO-SkyMed X-SAR影像在Fram海峡东格陵兰洋流的变化

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Sea ice speed vectors were extracted from COSMO-SkyMed X-band SAR images acquired twice per day from March 2013 to December 2014 over the East Greenland current (EGC) in western Fram Strait. Only winter periods (October–May) were investigated. Maximum ice speed of 81.7 cm/s to SW was detected at 80°N 0°W between November 22 and 23, 2013. At 79°N between 7° and 5°W, sea ice speed vectors were mostly directed to S-SW but reversed to the north for short periods. Using ERA-Interim atmospheric data, the southward component of the ice speed (${max!.}, {+71.7}$, ${min!.}, {-30.9};text{cm/s}$) was correlated (${rm R}=0.93$) to the cross-strait sea level pressure gradient. Ice speeds due to the EGC were obtained by subtracting the wind-induced ice speed component estimated by linear regression. Results for winter 2013–2014 show that the mean southward component of the EGC (9.4 cm/s, $sigma =3.0$) accounted more than half of the mean sea ice speed (17.7 cm/s, $sigma =7.2$). The EGC oscillated between 5 and 15 cm/s and sustained the southward ice export during short periods when the wind reversed to north. Satellite-based measurements of the surface EGC are the complement to hydrographic measurements in Fram Strait, but further investigation is required to understand how the apparent variability of the current is influenced by the thickness of the ice transiting in the strait or by wind induced north-to-south oscillations of the sea surface in the strait.
机译：从2013年3月至2014年12月期间每天两次采集的COSMO-SkyMed X波段SAR图像中提取海冰速度矢量，这些图像是在Fram海峡西部的东格陵兰洋流（EGC）上采集的。仅调查了冬季（10月至5月）。在2013年11月22日至23日之间，在80°N 0°W处检测到西南冰的最大冰速为81.7厘米/秒。在7°和5°W之间的79°N处，海冰速度矢量主要指向S-SW但短时间向北扭转。使用ERA-Interim大气数据，将冰速的南向分量（$ {max！。}，{+ 71.7} $，$ {min！。}，{-30.9};文本{cm / s} $）与相关（$ {rm R} = 0.93 $）至两岸海平面压力梯度。 EGC引起的冰速是通过减去线性回归估计的风致冰速分量而获得的。 2013-2014年冬季的结果表明，EGC的平均向南分量（9.4 cm / s，$ sigma = 3.0 $）占平均海冰速度（17.7cm / s，$ sigma = 7.2 $）的一半以上。当风向北反转时，EGC在5至15 cm / s之间振荡并维持了向南的冰出口。基于卫星的地面EGC测量是对弗拉姆海峡水文测量的补充，但需要进一步研究以了解电流的表观变异性如何受到海峡中冰层厚度或北风引起的风影响的影响。海峡海面从南向南的振荡。

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