Seaglider observations of equatorial Indian Ocean Rossby waves associated with the Madden-Julian Oscillation
Seaglider observations of equatorial Indian Ocean Rossby waves associated with the Madden-Julian Oscillation
复制标题
与马登-朱利安振荡相关的赤道印度洋罗斯贝波的海上滑翔机观测
作者：
Webber B
在2011年9月至2012年1月的CINDY-CINDO实地活动期间，在80°E部署了一个Seaglider，并完成了3至4°S之间的10个南北部分，测量温度，盐度，溶解氧浓度和叶绿素荧光。这些高分辨率的地下观测提供了对这段时间内三次马登-朱利安振荡（MJO）事件所导致的赤道海洋罗斯贝波活动的深入了解。这些罗斯贝波产生温度O（1°C）、盐度O（0.2 g kg−1）、密度O（0.2 kg m−3）和氧浓度O（10 μmol kg−1）的变化，与温跃层10 m的垂直位移有关。的变化延伸到1000米，最深的海底滑翔机观测，突出了表面强迫的重要性，深赤道海洋。Seaglider观测到的温度变化大于ECCO-JPL再分析中模拟的温度变化，特别是在深度。在叶绿素最大值的表面和深度处，叶绿素荧光也有明显的变化。上升流从Rossby波和当地的风应力旋度导致增强浅滩的叶绿素最大值10-25米，在响应增加的营养物质和光的可用性。MJO通过赤道海洋Rossby波对初级生产的这种影响以前没有被认识到。
During the CINDY–DYNAMO field campaign of September 2011–January 2012, a Seaglider was deployed at 80°E and completed 10 north‐south sections between 3 and 4°S, measuring temperature, salinity, dissolved oxygen concentration, and chlorophyll fluorescence. These high‐resolution subsurface observations provide insight into equatorial ocean Rossby wave activity forced by three Madden‐Julian Oscillation (MJO) events during this time period. These Rossby waves generate variability in temperature O(1°C), salinity O(0.2 g kg−1), density O(0.2 kg m−3), and oxygen concentration O(10 μmol kg−1), associated with 10 m vertical displacements of the thermocline. The variability extends down to 1000 m, the greatest depth of the Seaglider observations, highlighting the importance of surface forcing for the deep equatorial ocean. The temperature variability observed by the Seaglider is greater than that simulated in the ECCO‐JPL reanalysis, especially at depth. There is also marked variability in chlorophyll fluorescence at the surface and at the depth of the chlorophyll maximum. Upwelling from Rossby waves and local wind stress curl leads to an enhanced shoaling of the chlorophyll maximum by 10–25 m in response to the increased availability of nutrients and light. This influence of the MJO on primary production via equatorial ocean Rossby waves has not previously been recognized.