BoBBLE: Ocean-Atmosphere Interaction and Its Impact on the South Asian Monsoon
BoBBLE: Ocean-Atmosphere Interaction and Its Impact on the South Asian Monsoon
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BoBBLE：海洋-大气相互作用及其对南亚季风的影响
DOI：
10.1175/bams-d-16-0230.1
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发表时间：
2018
影响因子：
8
通讯作者：
Vinayachandran P
中科院分区：
文献类型：
--
作者：
Vinayachandran P
孟加拉湾 (BoB) 在控制构成南亚夏季季风系统的天气系统方面发挥着重要作用。特别是，BoB 南部的海面温度 (SST) 较低，会影响海洋与大气的相互作用并影响季风。与东南部BoB相比，西南BoB气候凉爽，盐分较多，降雨量少，且受夏季季风流（SMC）影响。为了研究这些特征对季风的影响，印度和英国于 2016 年 6 月至 7 月期间联合开展了 BoB 边界层实验 (BoBBLE)。使用电导率-温度-深度 (CTD) 剖面仪、五架海洋滑翔机、一台海洋科学正在进行的 CTD (uCTD)、一台垂直微观结构剖面仪 (VMP)、两台 声学多普勒电流剖面仪 (ADCP)、Argo 浮标、漂流浮标、气象传感器和高空无线电探空仪气球。观测是沿着 8°N、85.3° 和 89°E 之间的纬向剖面进行的，在 8°N、89°E 处进行了 10 天的时间序列。本文介绍了 BoBBLE 现场计划在卫星数据支持下观察到的南部 BoB 的新特征。 BoBBLE 野外活动的主要结果显示，斯里兰卡圆顶和 SMC 处于季节演变的不同阶段，以及两次淡水化事件，在此期间上层盐度下降，导致厚屏障层的形成。 BoBBLE 观测是在季节内振荡的抑制阶段进行的；他们详细记录了海洋混合层的变暖和大气对对流的预处理。
The Bay of Bengal (BoB) plays a fundamental role in controlling the weather systems that make up the South Asian summer monsoon system. In particular, the southern BoB has cooler sea surface temperatures (SST) that influence ocean–atmosphere interaction and impact the monsoon. Compared to the southeastern BoB, the southwestern BoB is cooler, more saline, receives much less rain, and is influenced by the summer monsoon current (SMC). To examine the impact of these features on the monsoon, the BoB Boundary Layer Experiment (BoBBLE) was jointly undertaken by India and the United Kingdom during June–July 2016. Physical and biogeochemical observations were made using a conductivity–temperature–depth (CTD) profiler, five ocean gliders, an Oceanscience Underway CTD (uCTD), a vertical microstructure profiler (VMP), two acoustic Doppler current profilers (ADCPs), Argo floats, drifting buoys, meteorological sensors, and upper-air radiosonde balloons. The observations were made along a zonal section at 8°N between 85.3° and 89°E with a 10-day time series at 8°N, 89°E. This paper presents the new observed features of the southern BoB from the BoBBLE field program, supported by satellite data. Key results from the BoBBLE field campaign show the Sri Lanka dome and the SMC in different stages of their seasonal evolution and two freshening events during which salinity decreased in the upper layer, leading to the formation of thick barrier layers. BoBBLE observations were taken during a suppressed phase of the intraseasonal oscillation; they captured in detail the warming of the ocean mixed layer and the preconditioning of the atmosphere to convection.