Mean vertical sections of zonal currents in the Tropical Pacific

Mean subthermocline and intermediate zonal currents meridional sections are produced at several longitudes across the Tropical Pacific, from 18°S to 18°N and 0 to 2000m depth. They are based on a compilation of shipboard ADCP measurements, and absolute geostrophic velocities constructed from a high-resolution 0–2000-m Argo climatology referenced to a 1000-m velocity field derived from Argo float drifts.
Description
1) SADCP data obtained from ships transiting in the low-latitude tropical Pacific, during 1999–2015 (see Cravatte et al., 2017, 190 cruises) are compiled. Most of the data (128 cruises) were provided by the Joint Archive for Shipboard ADCP (JASADCP) at the University of Hawaii, with a large fraction from the NOAA ship Ka’imimoana, servicing the TAO array of moored buoys.
All data retrieved from the JASADCP center were from their ‘‘standard subset’’ containing hourly averages interpolated to a 10-m vertical grid. For the other datasets, SADCP data were provided as 5- to 15-min temporal averages with 5- to 24-m vertical resolution. They were then averaged and interpolated to the 1-h, 10-m vertical grid. The complete dataset was mapped on a 0.25° latitude by 1° longitude grid using a simple Gaussian weighting function with 0.25° latitude and 3° longitude decorrelation scales, independent of the timing of the measurements, with windows of 0.5° of latitude and 6° of longitude.
2) The mean Argo temperature and salinity gridded climatology with a 1/6° resolution (Roemmich and Gilson 2009 was used to compute dynamic height anomalies. Derived zonal geostrophic shear both on and off the equator were computed following the method presented by Picaut and Tournier (1991) using a 1000-m reference level. The 1000-m Argo float drift then provided the constant of integration for vertically integrating the geostrophic shear to obtain a field of mean absolute geostrophic velocity.

次温跃层及中层纬向流的平均经向剖面在热带太平洋的多个经度上生成，覆盖范围为南纬18°至北纬18°、深度0至2000米。这些剖面基于船载声学多普勒流速剖面仪（shipboard ADCP）测量数据的汇编，以及由高分辨率0-2000米Argo气候态数据构建的绝对地转流速——该气候态数据参考了源自Argo浮标漂移的1000米流速场。
描述
1）汇编了1999-2015年间低纬度热带太平洋航行船舶获取的SADCP数据（参见Cravatte等人，2017，共190次巡航）。大部分数据（128次巡航）由夏威夷大学的船载ADCP联合档案库（JASADCP）提供，其中很大一部分来自服务于TAO锚定浮标阵列的NOAA船舶Ka'imimoana。
从JASADCP中心获取的所有数据均来自其‘标准子集’，包含插值至10米垂直网格的小时平均值。对于其他数据集，SADCP数据以5至15分钟时间平均的形式提供，垂直分辨率为5至24米。随后这些数据被平均并插值至1小时、10米垂直网格。
2）采用分辨率为1/6°的平均Argo温盐网格化气候态数据（Roemmich和Gilson，2009）计算动力高度异常。赤道及赤道外区域的纬向地转切变根据Picaut和Tournier（1991）提出的方法计算，采用1000米参考层。随后，1000米处的Argo浮标漂移为地转切变的垂直积分提供积分常数，从而得到平均绝对地转流速场。