Arctic-wide operational sea ice drift from enhanced-resolution QuikScat/SeaWinds scatterometry and its validation
Arctic-wide operational sea ice drift from enhanced-resolution QuikScat/SeaWinds scatterometry and its validation
复制标题
DOI：
10.1109/tgrs.2005.859352
复制
发表时间：
2006
影响因子：
8.2
通讯作者：
J. Haarpaintner
中科院分区：
文献类型：
--
作者：
J. Haarpaintner
近实时增强分辨率 QuikScat/SeaWinds (QS) 散射测量复合数据用于通过整个北极的最大互相关进行每日自动 48 小时海冰跟踪。为了获得最佳性能，使用 61/spl 倍/61 像素的相关窗口。垂直 (VV) 和水平 (HH) 两种 QS 偏振均独立使用，这允许通过分别比较两个漂移矢量 u/spl I.oarr//sub VV/ 和 u/spl I.oarr//sub HH/ 来过滤最终结果中的错误矢量。通过设置最小相关系数并考虑运动场的空间一致性来执行附加滤波。该算法已通过国际北极浮标计划 2002/2003 年冬季浮标数据进行了验证，显示 48 小时位移的误差标准偏差在纬度和经度方向分别为 3.1 和 3.2 公里。这对应于冰漂移速度的误差标准偏差仅为 2.6 厘米/秒。在冰浓度较低的动态区域（例如弗拉姆海峡南部），误差最大。增强分辨率的数据将之前的漂移结果提高了约 25%，但由于生产复合材料所需的 36 小时，数据仍然模糊。
The near-real-time enhanced-resolution QuikScat/SeaWinds (QS) scatterometry composite data are used for daily automatic 48-h sea ice tracking by maximum cross-correlation over the entire Arctic. A correlation window of 61 /spl times/ 61 pixels is used for best performance. Both QS polarizations, vertical (VV) and horizontal (HH), are used independently, which permits to filter the final results for erroneous vectors by comparing the two drift vectors, u/spl I.oarr//sub VV/ and u/spl I.oarr//sub HH/, respectively. Additional filtering is performed by setting a minimum correlation coefficient and by considering the spatial consistency of the motion field. The algorithm has been validated with winter 2002/2003 buoy data from the International Arctic Buoy Program showing error standard deviations in the 48-h displacement of 3.1 and 3.2 km in the latitude and longitude direction, respectively. This corresponds to an error standard deviation in ice drift speed of just 2.6 cm/s. Errors are largest in dynamic regions with lower ice concentrations as for example the southern Fram Strait. The enhanced-resolution data improve previous drift results by about 25%, but are still blurred by the necessary 36-h period to produce the composites.