Anomaly of surface circulation and Ekman transport in Banda Sea during 'Normal' and ENSO episode (2008-2011)

3rd International Symposium on LAPAN-IPB Satellite For Food Security and Environmental Monitoring 2016

地球科学;轻工业;生态环境科学

Horhoruw, Selfrida M.^1 ; Atmadipoera, Agus S.^1 ; Nanlohy, Pieldrie^2 ; Nurjaya, I. Wayan^1

Department of Marine Science and Technology, FPIK IPB Bogor, Indonesia^1

Department of Physics, FMIPA UNPATTI Ambon, Indonesia^2

关键词: Ekman transport;    El Nino southern oscillation;    Indonesian throughflow;    Local forcing;    Ocean dynamics;    Regional climate;    Surface circulation;    Upwelling intensity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/54/1/012041/pdf
DOI  :  10.1088/1755-1315/54/1/012041

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Banda Sea (BS) is a deep and large ocean basin in interior Indonesia Seas which may play a significant role on regulating ocean dynamics and regional climate variability such as El Nino Southern Oscillation (ENSO). It also provides a 'temporary reservoir' for Indonesian Throughflow (ITF), and as a region of seasonal alternating upwelling/downwelling. The objective of present study is to investigate changes of surface ocean circulation and associated upwelling anomaly during 'normal' (2008/2009), El Nino (2009/2010) and La Nina (2010/2011) years in BS, using data sets from validated INDESO model outputs. The results show that surface circulation in BS is regulated by both local forcing of monsoon winds and inflow of ITF via Flores Sea (FS), Lifamatola Strait, and Halmahera/Seram Seas. Inflow from FS is drastically increased during northern winter and 'normal' year. The upwelling event occurs along the eastern edge of BS with southwestward Ekman transport and its kinetic energy of above 10 Joule. The Ekman layer depth in BS is about 60 m. During La Nina event surface circulation is much stronger with kinetic energy of about 700 J, causing Ekman layer shallower due to increased Ekman transport and upwelling intensity.