Effective resolution and drift of Paroscientific pressure sensors derived from long‐term seafloor measurements
Effective resolution and drift of Paroscientific pressure sensors derived from long‐term seafloor measurements
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DOI：
10.1029/2009gc002532
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发表时间：
2009-08
期刊：
影响因子：
3.7
通讯作者：
A. Polster;M. Fabian;H. Villinger
中科院分区：
文献类型：
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作者：
A. Polster;M. Fabian;H. Villinger
从1983年安装NOAA海啸预警系统DART开始，Paroscientific Digiquarz®宽带深度传感器已在许多海洋调查中用于长期海底压力测量。事实证明，该传感器非常可靠，在宽测量范围和高分辨率内具有良好的信号重复性。然而，到目前为止，其长期漂移，噪声水平和海底原位条件下的有效分辨率仅从少数已发表的研究和少数传感器中得知。在这项研究中，我们分析了118个长期海底压力时间序列（超过2个月，最长时间为9年），以研究在原位条件下的有效分辨率和长期漂移。数据来自DART、IFM-GEOMAR、LOLEM和CORK站。对于直接安装在海底的台站而言，数据的噪声水平以及传感器的平均分辨率均低于20.7 Pa（相当于2.07 mm的等效水位）的上限阈值。CORK传感器的噪声水平要大得多，中值为127 Pa。长期传感器漂移被假定为由初始指数部分和随后的线性漂移组成。现场平均漂移为−0.88 ± 0.73 kPa/a，根据所有可用数据确定，漂移随部署深度略有增加。我们第一次能够在现场条件下量化广泛使用的Paroscientific压力计的有效压力分辨率和漂移。我们的研究结果提供了重要的约束海底压力记录的解释。然而，仍然需要Paroscientific传感器的现场自校准程序，以便受益于高有效分辨率和长期稳定性，并提高精度，特别是用于监测海底地球动力学过程。
Starting with the installation of the NOAA tsunami early warning system DART in 1983, the Paroscientific Digiquarz® Broadband Depth Sensor has been deployed for long‐term ocean bottom pressure measurements in numerous marine investigations. The sensor turned out to be very reliable with a good signal repeatability within a broad measuring range and high resolution. However, up to now its long‐term drift, noise level, and effective resolution under in situ conditions at the seafloor are only known from a few published studies and for a few sensors. In this study we analyze 118 long‐term seafloor pressure time series (longer than 2 months and up to a maximum time period of 9 years) to investigate effective resolution and long‐term drift under in situ conditions. The data are from DART, IFM‐GEOMAR, LOLEM, and CORK stations. The noise level of the data and therefore the mean sensor resolution are lower than an upper threshold of 20.7 Pa (corresponding to 2.07 mm equivalent water level) for stations installed directly on the seafloor. The noise level of CORK sensors is much larger, with a median value of 127 Pa. Long‐term sensor drift is assumed to be composed of an initial exponential part and a subsequent linear drift. In situ mean drift is −0.88 ± 0.73 kPa/a, determined from all available data with a slight increase of drift with deployment depth. For the first time, we are able to quantify effective pressure resolution and drift of the widely used Paroscientific pressure gauges under in situ conditions. Our results provide important constrains for the interpretation of seafloor pressure records. However, in situ self‐calibration procedures for the Paroscientific sensors are still needed in order to benefit from high effective resolution and long‐term stability and also to increase accuracy especially for the monitoring of geodynamic processes at the seafloor.