How well can we derive Global Ocean Indicators from Argo data
How well can we derive Global Ocean Indicators from Argo data
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DOI：
10.5194/os-7-783-2011
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发表时间：
2011-11
期刊：
影响因子：
3.2
通讯作者：
K. von Schuckmann;P.-Y Le Taron;P. Le Traon
中科院分区：
文献类型：
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作者：
K. von Schuckmann;P.-Y Le Taron;P. Le Traon
Argo于2000年开始部署，到2007年11月，该阵列达到了在全球运行3000个浮标的初始目标。本研究利用2005 - 2010年Argo的温度和盐度测量值来估算全球海洋指标（GOIs），如全球海洋热含量（GOHC）、全球海洋淡水含量（GOFC）和全球立体海平面（GSSL）。我们开发了一种基于加权平均值的简单框平均方案的方法。估计了由于数据处理方法和气候学选择而产生的不确定性。该方法易于实施和运行，可用于建立全球海洋的常规监测。在6年的时间里，GOHC和GSSL的变化趋势分别为0.54±0.1 wm2和0.75±0.15 mmyr 1。GOFC的趋势几乎不显著。结果表明，在全球尺度上存在显著的年际变化，特别是GOFC。从今天的Argo采样中得出的年平均goi， GSSL的精度为±0.11 cm， GOHC的精度为±0.22 - 10 8 jm2， GOFC的精度为±700 km 3。在观测系统不存在系统误差的假设下，基于Argo完整采样1500 m以上深度的goi的长期趋势（15年），GSSL的精度为±0.04 mm yr / 1， GOHC的精度为±0.02 W m / 2， GOFC的精度为±20 km 3 yr / 1。
Argo deployments began in the year 2000 and by November 2007, the array reached its initial goal of 3000 floats operating worldwide. In this study, Argo temperature and salinity measurements during the period 2005 to 2010 are used to estimate Global Ocean Indicators (GOIs) such as global ocean heat content (GOHC), global ocean fresh- water content (GOFC) and global steric sea level (GSSL). We developed a method based on a simple box averag- ing scheme using a weighted mean. Uncertainties due to data processing methods and choice of climatology are es- timated. This method is easy to implement and run and can be used to set up a routine monitoring of the global ocean. Over the six year time period, trends of GOHC and GSSL are 0.54± 0.1 W m 2 and 0.75± 0.15 mm yr 1 , re- spectively. The trend of GOFC is barely significant. Re- sults show that there is significant interannual variability at global scale, especially for GOFC. Annual mean GOIs from the today's Argo sampling can be derived with an accu- racy of ±0.11 cm for GSSL, ±0.22◊ 10 8 J m 2 for GOHC, and ±700 km 3 for GOFC. Long-term trends (15 yr) of GOIs based on the complete Argo sampling for the upper 1500 m depth can be estimated with an accuracy of ±0.04 mm yr 1 for GSSL, ±0.02 W m 2 for GOHC and ±20 km 3 yr 1 for GOFC - under the assumption that no systematic errors re- main in the observing system.