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Study on SST front disappearance in the subtropical North Pacific using microwave SSTs

机译：利用微波SST研究北太平洋亚热带SST锋面消失

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We investigated the processes relating to the weakening of the SST front in the subtropical front (STF) zone using the Advanced Microwave Scanning Radiometer for the Earth Observing System SSTs for 7 years with temporal/spatial resolutions of 1 day/12.5 km. In April, the SST front is strong with a high gradient magnitude (GM) and Jensen-Shannon divergence (JSD) band; in August, SSTs become uniform (28-30℃), together with small GMs (<0.8℃/100 km) and JSDs (<0.75). Since the SST front features become invisible in GM/JSD snapshots and weekly-monthly averaged images, we call this phenomenon 'SST front disappearance (SFD)'. The SFD occurs in August, but the number of high SSTs (>30℃) in August is smaller than that in July, which indicates that the SFD results from not only the increase in lower SSTs but also the decrease in higher SSTs. In June and July, the GM distributions have quite large standard deviations compared to those in May and August. We also investigated the vertical profile of STF using in situ temperature/salinity profiles. It was revealed that the SFD influence extends to 50 m depth. The area of high integrated heat flux and shallow mixed layer depth were found to correspond to the area where the GM decreases from 0.9 to 0.6℃/100 km during June-August. Quantitative analyses confirmed that the SFD mechanism may be attributable to the establishment of the shallow mixed layer by the high integrated heat flux from May to July. From July to August, the SST heating/cooling in the north/south of the SST front may accelerate the SFD.
机译：我们使用先进的微波扫描辐射计对地球观测系统SST进行了7年的时间/空间分辨率为1天/12.5 km的研究，研究了与副热带锋（STF）区域SST锋减弱有关的过程。 4月，SST锋强，具有高梯度幅度（GM）和Jensen-Shannon发散（JSD）波段；在八月，海表温度变得均匀（28-30℃），小GMs（<0.8℃/ 100 km）和JSDs（<0.75）一起变得均匀。由于SST前部特征在GM / JSD快照和每周平均图像中不可见，因此我们将此现象称为“ SST前部消失（SFD）”。 SFD发生在8月，但是8月高SST（> 30℃）的数量少于7月，这表明SFD不仅是由于低SST的增加，而且是由于高SST的减少。与5月和8月相比，6月和7月的GM分布具有较大的标准差。我们还使用原位温度/盐度剖面调查了STF的垂直剖面。结果表明，SFD的影响扩展到50 m深度。发现高总热通量和较浅的混合层深度的区域对应于6-8月期间GM从0.9降低到0.6℃/ 100 km的区域。定量分析证实，SFD机制可能归因于5月至7月高集成热通量建立了浅层混合层。从7月到8月，SST前端南北的SST加热/冷却可能会加速SFD。

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