Dynamics of the surface layer diurnal cycle in the equatorial Atlantic Ocean (0°, 23°W)
Dynamics of the surface layer diurnal cycle in the equatorial Atlantic Ocean (0°, 23°W)
复制标题
赤道大西洋表层日循环动态（0°，23°W）
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Mcphaden
中科院分区：
文献类型：
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作者：
J. Wenegrat;M. Mcphaden
从热带大西洋(Pirata)系泊系统(Pirata)的0°，23°W预测和研究系泊阵列(Pirata)获得了15年的时间序列(1999-2014年)，其中包括8个月的高分辨率近地表速度数据(2008年10月至2009年6月)，用于分析赤道中部大西洋海表面温度、切变和层结的日变化。海洋的昼夜循环表现出明显的季节性，这与地面风场的季节变化有关。在北方夏季和秋季，稳定的信风和晴朗的天空占据主导地位，海洋表面温度的日变化有限。随着Richardson数的减小，白天的切变层经常下降到混合层下方边缘不稳定的赤道潜流中，这是产生深循环湍流的有利条件。相比之下，北方冬季和春季，风较轻，变化较大，混合层较浅，海表面温度日变化大。在这些条件下，日切变层不那么显著，潜流的稳定性增加，这表明日近地表切变和深循环湍流之间存在季节协变性。热带不稳定波对海洋日循环的调制也被发现。这项工作首次对赤道大西洋近地表切变、层结和边缘不稳定的日循环进行了观测评估，证实了先前的模拟结果，并为赤道太平洋的类似工作提供了补充视角。
A 15 year time series (1999–2014) from the 0°, 23°W Prediction and Research Moored Array in the Tropical Atlantic (PIRATA) mooring, which includes an 8 month record (October 2008 to June 2009) of high-resolution near-surface velocity data, is used to analyze the diurnal variability of sea surface temperature, shear, and stratification in the central equatorial Atlantic. The ocean diurnal cycle exhibits pronounced seasonality that is linked to seasonal variations in the surface wind field. In boreal summer and fall, steady trade winds and clear skies dominate, with limited diurnal variability in sea surface temperature. Diurnal shear layers, with reduced Richardson numbers, are regularly observed descending into the marginally unstable equatorial undercurrent below the mixed layer, conditions favorable for the generation of deep-cycle turbulence. In contrast, in boreal winter and spring, winds are lighter and more variable, mixed layers are shallow, and diurnal variability of sea surface temperature is large. During these conditions, diurnal shear layers are less prominent, and the stability of the undercurrent increases, suggesting seasonal covariance between diurnal near-surface shear and deep-cycle turbulence. Modulation of the ocean diurnal cycle by tropical instability waves is also identified. This work provides the first observational assessment of the diurnal cycle of near-surface shear, stratification, and marginal instability in the equatorial Atlantic, confirming previous modeling results and offering a complementary perspective on similar work in the equatorial Pacific.
EGEE-3 活动期间 PIRATA 浮标赤道大西洋昼夜周期的一维建模研究
影响因子：
2.3
作者：
G. Caniaux;Y. DuPenhoat;M. Dengler;H. Giordani;R. Hummels
通讯作者：
R. Hummels
影响因子：
4.4
作者：
Sillmann, J.;Kharin, V. V.;Bronaugh, D.
通讯作者：
Bronaugh, D.
大西洋冷舌上层海洋二重热通量的季节和区域变化
影响因子：
4.1
作者：
Hummels;M. Dengler;B. Bourlés
通讯作者：
B. Bourlés