Ocean glider observations in Greater Cook Strait, New Zealand

continuous, long-duration and high resolution hydrographic sampling from gliders have enabled the evaluation of variability in density structure of submesoscale features in a new zealand shelf sea. glider sampling allows for: 1) minimal disturbance of upper stratification and 2) horizontal and temporal spacing between profiles to be typically less than one kilometer and 30 minutes depending on the profile depth. seven glider surveys were completed from 2015 to 2018. the average glider track spanned 132 40o75s, 174o49e to 39o91s, 171o90e. in each survey, the glider transverses from east to west and back to its deployment location. for surveys 3, 4, 6, 9 and 11, the glider was deployed closer to the cook strait narrows. as the glider would spend multiple days trying to overcome strong currents due to strong tidal fluctuations near the narrows, deployments for surveys 12 and 15 were from tasman bay to maximise observations across the greater cook strait shelf sea.this study used teledyne webb research slocum g2 gliders equipped with seabird ctd sensor, aanderaa oxygen optode and wet labs environmental characterization optics (eco) puck, that measured chlorophyll-a fluorescence, backscatter (at 470, 532, 660 and 700 nm) and chromophoric dissolved organic matter (cdom). temperature, conductivity, and pressure data were sampled at 0.5 hz, and subsequently processed to remove spikes. the accuracy within calibration range of temperature and conductivity were +/-0.002oc and +/-0.0003 s m-1, respectively. glider data processing was completed using the socib glider toolbox (https://github.com/socib/glider_toolbox; troupin et al. (2015)). glider data processing includes salinity lag correction for the thermal lag error for the un-pumped ctd unit. data were averaged in vertical bins of 1 m.

连续、长时间和高分辨率的浮标水文采样，为评估新西兰大陆架海域次中尺度特征的密度结构变率提供了新的可能。浮标采样技术具有以下优势：1）对上层水层的扰动最小化；2）横跨和垂直方向上的剖面间距通常小于一公里和30分钟，具体取决于剖面深度。自2015年至2018年间，共完成了七次浮标调查。平均而言，浮标轨迹跨越了132°40'75"S，174°49'E至39°91'S，171°90'E。在每次调查中，浮标从东向西穿越，再返回其投放地点。对于第3、4、6、9和11次调查，浮标投放位置靠近库克海峡狭窄处。由于海峡附近潮汐波动强烈，浮标需花费数日时间克服强劲的洋流，因此第12和15次调查的投放地点选择在塔斯曼湾，以最大化对库克海峡大陆架海域的观测。本研究使用了配备Seabird CTD传感器、Aanderaa氧光极和Wet Labs环境特征光学（Eco） puck的Teledyne Webb Research Slocum G2浮标，测量了叶绿素a荧光、后向散射（在470、532、660和700纳米处）以及色散溶解有机物（CDOM）。温度、电导率和压力数据以0.5赫兹的采样率采集，并经过后续处理以去除尖峰。温度和电导率在标定范围内的精度分别为±0.002°C和±0.0003 S·m^-1。浮标数据处理采用了SOCIB浮标工具箱（https://github.com/socib/glider_toolbox；Troupin等，2015年）。浮标数据处理包括对未泵CTD单元的热滞误差进行盐度滞后校正。数据在1米高的垂直层中进行了平均。