Towards closure of regional heat budgets in the North Atlantic using Argo floats and surface flux datasets
Towards closure of regional heat budgets in the North Atlantic using Argo floats and surface flux datasets
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DOI：
10.5194/os-5-59-2009
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发表时间：
2009-01-01
期刊：
影响因子：
3.2
通讯作者：
Hadfield, R. E.
中科院分区：
文献类型：
--
作者：
Wells, N. C.;Josey, S. A.;Hadfield, R. E.
利用1999-2005年ARGO剖面浮标资料以及NCEP/NCAR和NOC表层通量资料，研究了北大西洋20度-60度之间的上层海洋热量收支(0-300m)。预算中不同项目(储热、平流、扩散和表面交换)的估计数是使用Hadfield等人开发的方法得出的。(2007a，b)。该方法包括对各个轮廓进行最优内插，以产生具有10度×10度网格框分辨率的误差估计的网格场。对于一些地区，特别是东部亚热带大西洋，热量收支的闭合是在误差估计范围内获得的，但对于那些包括墨西哥湾流的盒子则不是这样。在所考虑的整个范围内，具有NOC(NCEP/NCAR)表面通量的20个箱中有13(9)个获得了闭合。对北纬20-30度，西经35-25度的季节热量收支进行了详细的分析。在这里，基于NCEP的预算的年平均残差为-55+/-35Wm(-2)，而基于NOC的值为-4+/-35Wm(-2)。对于这个盒子，36Wm(-2)的净散度(Ekman=-4Wm(-2)，地转=11Wm(-2)，扩散=29Wm(-2))抵消了32Wm(-2)的净热量与NOC表面热通量的差额。这一框中的结果与早先使用俯冲阵列中研究浮标的测量对通量的评估是一致的，该测量显示NCEP存在偏差，但浮标值与NOC场很好地吻合。
The upper ocean heat budget (0-300 m) of the North Atlantic from 20 degrees-60 degrees N is investigated using data from Argo profiling floats for 1999 -2005 and the NCEP/NCAR and NOC surface flux datasets. Estimates of the different terms in the budget (heat storage, advection, diffusion and surface exchange) are obtained using the methodology developed by Hadfield et al. (2007a, b). The method includes optimal interpolation of the individual profiles to produce gridded fields with error estimates at a 10 degrees x 10 degrees grid box resolution. Closure of the heat budget is obtained within the error estimates for some regions-particularly the eastern subtropical Atlantic-but not for those boxes that include the Gulf Stream. Over the whole range considered, closure is obtained for 13 (9) out of 20 boxes with the NOC (NCEP/NCAR) surface fluxes. The seasonal heat budget at 20-30 degrees N, 35-25 degrees W is considered in detail. Here, the NCEP based budget has an annual mean residual of -55 +/- 35 Wm(-2) compared with a NOC based value of -4 +/- 35 Wm(-2). For this box, the net heat divergence of 36 Wm(-2) (Ekman=-4 Wm(-2), geostrophic=11 Wm(-2), diffusion=29 Wm(-2)) offsets the net heating of 32 Wm(-2) from the NOC surface heat fluxes. The results in this box are consistent with an earlier evaluation of the fluxes using measurements from research buoys in the subduction array which revealed biases in NCEP but good agreement of the buoy values with the NOC fields.