The evolution of thermohaline structure at the upper ocean during three tropical cyclones (TCs) in the Northwest Pacific was studied in this study based on successive observation by two new-style underwater gliders during fall 2018. These remote-controllable gliders with CTD sensor enabled us to explore high frequency responses of temperature, salinity, mixed and barrier layers in the upper ocean to severe TCs in this area. Results showed that three significant cooling-to-warming and stratification destructing-to-reconstructing processes at the mixed layer occurred during the lives of three TCs. The maximal cooling of SST all reached ⩾=0.5°C although TCs with different intensities had different minimal distances to the observed area. Under potential impacts of solar radiation, tide and inertial motions, the mixed layer depth possessed significant high-frequency fluctuations during TC periods. In addition, barrier layers appeared and vanished quickly during TCs, accompanied with varied temperature inversion processes.

本研究基于2018年秋季两次新型水下滑翔机的连续观测，研究了西北太平洋三个热带气旋（TC）期间高空热盐环结构的演变。这些带有CTD传感器的可遥控滑翔机使我们能够探索高空温度，盐度，混合层和阻挡层对该地区严重TC的高频响应。结果表明，在三个TC的生命周期中，混合层发生了三个从显着的变暖到变暖和从分层到重构的过程。尽管不同强度的TC到观察区域的最小距离不同，但SST的最大冷却都达到⩾= 0.5°C。在太阳辐射，潮汐和惯性运动的潜在影响下，在TC期间，混合层深度具有明显的高频波动。此外，在TC期间，势垒层迅速出现并消失，伴随着不同的温度反转过程。