On the accuracy of North Atlantic temperature and heat storage fields from Argo
On the accuracy of North Atlantic temperature and heat storage fields from Argo
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DOI：
10.1029/2006jc003825
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发表时间：
2007-01-25
影响因子：
3.6
通讯作者：
Hirschi, J. J-M.
中科院分区：
文献类型：
--
作者：
Hadfield, R. E.;Wells, N. C.;Hirschi, J. J-M.
[ 1]研究了Argo剖面浮标数据集估计北大西洋上层海洋温度和热储存的准确性。横跨36度N的水文剖面用于评估基于Argo的温度场估计的不确定性。基于Argo的温度场相对于截面测量值的均方根（RMS）差约为0.6摄氏度。RMS差异较小，小于0.4摄氏度，在东部盆地和较大，高达2.0摄氏度，向西部边界。相比之下，该部分相对于世界海洋地图集（WOA）的差异为0.8摄氏度。对于上面100米，Argo的改进更显着，RMS差异为0.56摄氏度，而WOA为1.13摄氏度。海洋环流和气候高级模式（OCCAM）被用来确定混合层热储存估计中的Argo采样误差。用OCCAM亚采样到典型的Argo采样密度，发现在西边界外，北大西洋副热带混合层月热储量在10 ° × 10 °区域平均时，采样误差为10 - 20 W m（-2）。当考虑季节性热存储时，该误差减小到小于10 Wm（-2）。这种幅度的误差表明，Argo数据集是用于调查年际时间尺度上的混合层热储存的变化。然而，在墨西哥湾流区域和北纬40度以北，预期的采样误差增加到50 Wm（-2）以上，限制了Argo在这些地区的使用。
[ 1] The accuracy with which the Argo profiling float dataset can estimate the upper ocean temperature and heat storage in the North Atlantic is investigated. A hydrographic section across 36 degrees N is used to assess uncertainty in Argo-based estimates of the temperature field. The root-mean-square (RMS) difference in the Argo-based temperature field relative to the section measurements is about 0.6 degrees C. The RMS difference is smaller, less than 0.4 degrees C, in the eastern basin and larger, up to 2.0 degrees C, toward the western boundary. In comparison, the difference of the section with respect to the World Ocean Atlas (WOA) is 0.8 degrees C. For the upper 100 m, the improvement with Argo is more dramatic, the RMS difference being 0.56 degrees C, compared to 1.13 degrees C with WOA. The Ocean Circulation and Climate Advanced Model (OCCAM) is used to determine the Argo sampling error in mixed layer heat storage estimates. Using OCCAM subsampled to typical Argo sampling density, it is found that outside of the western boundary, the mixed layer monthly heat storage in the subtropical North Atlantic has a sampling error of 10 - 20 W m(-2) when averaged over a 10 degrees X 10 degrees area. This error reduces to less than 10 Wm(-2) when seasonal heat storage is considered. Errors of this magnitude suggest that the Argo dataset is of use for investigating variability in mixed layer heat storage on interannual timescales. However, the expected sampling error increases to more than 50 Wm(-2) in the Gulf Stream region and north of 40 degrees N, limiting the use of Argo in these areas.