Investigation of ENSO, IOD and MJO toward the vertical temperature in Bali Strait
WE Rintaka, D Berlianty, B Priyono, TA Tiadi

Institute for Marine Research and Observation, Ministry Marine Affair and Fisheries

Abstract

Bali strait get the influence of upwelling from the Indian ocean, especially when southeast monsoon (SEM). In normal years, upwelling processes in southern Java include Bali Strait appear when entering SEM in early June to mid-October, with cold SST. Climatic variability, the incidence of India Ocean dipole (IOD) is independent of ENSO. IOD correlates strongly with seasonal conditions. Medden Julian Ossilation (MJO) can affect the ENSO cyrcle even though it is not in the context of the cause Niño or La Niña formation, but can contribute to the speed of development and intensity of El Nino and La Niña. This study aims to investigate of ENSO, IOD and MJO toward the vertical temperature in Bali Strait during SEM (August 2013 & August 2017). The location of the study in Bali Strait 8.20S - 8.80S and 114.40E-115.20E. The method used is observation in August 2013 and 2017. The information about ENSO, this study is complemented by the Ocean Nino Index (ONI) climate index data and MJO obtained from NOAAs Climate Prediction Center. The information on IOD events is positive or negative mode, DMI data is also used from JAMSTEC. Information on the incidence of ENSO and IOD was used to further analyze the influence of these climatic conditions on the evolution of vertical temperature profiles in the Bali Strait. Seasonal vertical profile temperature variability linked to climate index in Bali Strait waters is processed and analyzed using ferret software from PMEL-NOAA, ODV, and General Mapping Tools (GMT). Based on the results vertical temperature in the August 2013 were relatively cooler with a thicker mixer layer than the August 2017. In the period of August 2013, the normal ENSO conditions (-0.3) with IOD (+) (0.1) with weakening intensity, while there was a period of August 2017 normal ENSO conditions (-0.16) with strong (+) IOD (0.6). Direct linier correlation among ENSO and IOD. MJO in August 2017 looks strong than August 2013 although at the same ENSO phase (neutral). Indirect linier correlation among ENSO and MJO.

Keywords: vertival temperature, ENSO, IOD, MJO, Bali Strait

Topic: Coastal and Ocean Dynamics

Link: https://ifory.id/abstract-plain/uWN4KBjyMqpQ

Web Format | Corresponding Author (Wingking Era Rintaka Siwi)