Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors, Version 2

Daily ice motion vectors are computed from a wide variety of sensors ranging from passive microwave radiometers, such as the Scanning Multichannel Microwave Radiometer (SMMR), to International Arctic Buoy Programme (IABP) buoy data. Daily gridded fields combine data from all sensors, from November 1978 through December 2012. Grids extend from 48.4° N to 90° N, and from 53.2° S to 90° S. Mean gridded fields include yearly, monthly, and weekly means, and a mean for the entire time series. Both daily and mean gridded fields are in 2-byte integer format, reprojected to 25 km Northern and Southern Hemisphere EASE-Grids. Browse images of mean fields are available in Portable Network Graphics (PNG) and Postscript (PS) formats. Raw ice motion vectors from each sensor are in tab-delimited ASCII text format.

本数据集的每日海冰运动矢量（ice motion vectors）由多种传感器计算得到，涵盖被动微波辐射计（passive microwave radiometer）类设备（如扫描多通道微波辐射计（Scanning Multichannel Microwave Radiometer, SMMR））以及国际北极浮标计划（International Arctic Buoy Programme, IABP）的浮标观测数据。1978年11月至2012年12月期间的每日网格化场整合了所有传感器的观测数据。该网格覆盖范围为北纬48.4°至90°、南纬53.2°至90°。平均网格化场包含年平均、月平均、周平均及全时间序列平均四种产品。每日与平均网格化场均采用2字节整数格式，并重投影至25千米分辨率的南北半球EASE格网（EASE-Grid）。平均场的预览图像支持可移植网络图形（Portable Network Graphics, PNG）与Postscript（PS）两种格式。各传感器的原始海冰运动矢量采用制表符分隔的ASCII文本格式存储。