Sonic anemometer measurements on an ice floe on the Weddell Sea, 11/2004-01/2005

As a part of the international expedition Ice Station Polarstern (ISPOL,
http://www.ispol.de/), sonic anemometer measurements were carried out on ice
floes on the Weddell Sea (68 degrees S, 55 degrees W) in 28.11.2004 - 2.1.2005.
Two Metek USA-1 sonic anemometers were used, set up on top of 3.5-m high steel
masts.

The instrument were set up in two different locations on the single large ISPOL
ice floe. For a short period, one of them was also set up on a separate floe.
Three wind components and air temperature were sampled at 20 Hz frequency. From
these data, momentum and sensible heat fluxes and other turbulence parameters
were automatically calculated at 10 minute intervals. The data set includes the
raw (20 Hz) air velocity and temperature data, and the following parameters as
10-minute averages: wind velocity (m/s), air temperature (degrees C), variances
and covariances of the wind/temperature components, friction velocity, drag
coefficient, Monin-Obukhov length and sensible heat flux. The air temperatures
are just trendsetting, relative readings.

作为国际科考项目“极星号冰站（Ice Station Polarstern, ISPOL，http://www.ispol.de/）”的组成部分，研究团队于2004年11月28日至2005年1月2日在威德尔海（南纬68°，西经55°）的浮冰上开展了超声风速仪（sonic anemometer）观测实验。本次实验使用两台Metek USA-1型超声风速仪，将其安装于3.5米高的钢桅杆顶部。

这些仪器被布设至这座大型ISPOL浮冰的两个不同点位。曾有一段短时间，其中一台仪器还被架设在另一座独立浮冰上。实验以20赫兹的采样频率采集三维风速分量与空气温度数据。基于上述原始数据，研究人员以10分钟为间隔自动计算得到动量通量、感热通量及其他湍流参数。本数据集包含原始（20赫兹）空气速度与温度数据，以及以下10分钟平均参数：风速（单位：m/s）、气温（单位：℃）、风速/气温分量的方差与协方差、摩擦速度、拖曳系数、莫宁-奥布霍夫长度（Monin-Obukhov length）以及感热通量。本次采集的气温数据仅为相对读数，仅具备趋势参考价值。