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Sea surface salinity and the ocean structure in the tropical Indian Ocean

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The Variability of the tropical Indian Ocean (TIO) is crucial to the global water cycle and heat transportation. At the seasonal time scale, the variability of the TIO is closely related to the monsoon circulation. Interannualy, on the one hand, it is influenced remotely by the variability of the Pacific Ocean through atmospheric bridge and Rossby wave. On the other hand, the variability of TIO is independent of El Nino-Southern Oscillation (ENSO) and varies as a dipole pattern along the equator, know as the Indian Ocean Dipole (IOD). In addition, the unique distribution of the TIO with shallower thermocline in the west, due to the unstable easterlies along the equator, makes the variability of the TIO differ from that in the Pacific and the Atlantic Ocean with deeper thermocline in the west. However, the TIO variability is still hard to precisely predict and the diffulty is well acknowledged nowadays.
To this end, the main aim of this disertation is to better undestand the seasonal and interannual variability of the TIO. Specifically, the first objective is to distinguish the relative impacts of heat flux and wind stress on the interannual variability of upper-ocean temperature in the TIO. The second objective focuses on studying the relationship among the parameters in the mixed layer and thermocline with the barrieer layer thickness (BLT) in the TIO. Tha last objective of this dissertation is to investigate the role of sea surface salinity (SSS) in the onset of South Asian Summer Monsoon (SASM). To achieve this aim, the observation datasets including float and satelite data, reanalysis data, and simulations from a high-resolution model, are employed.
To Conclude, This Ph.D research primarity investigates the variability of the TIO by distingushing the main driver of the interannual upper-ocean temperature variability, studying the relationship between SSS and thermocline with BLT at seasonal and interannual scales and discovering the role of SSS in the onset of SASM. However, more efforts are highly demanded in the neear future to investiga more sophiscated air-sea interaction mechanism within the TIO. For example, the theory of crossing depth is only adapted in the area of (15S-20N). Thus , how to distinguish the relative impacts of heat flux and wind stress on the upper-ocean variability in the area to the south of 15S is still to be unraveled. In addition, the role of SSS in the interannual variability of the TIO needs more precise datasets to investigate and the numerical modeling with more sophisticated air-sea interactions sholud be taken into consideration.

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Ketersediaan

B20210419014

DS 551.46 YUA s

Perpustakaan BIG (500)

Tersedia

Informasi Detail

Judul Seri

-

No. Panggil

DS 551.46 YUA s

Penerbit

Netherland : University of Twente., 2020

Deskripsi Fisik

viii, 93 hlm. : illus. ; 24 cm.

Bahasa

Inggris

ISBN/ISSN

978-90-365-4959-2

Klasifikasi

551.46

Tipe Isi

text

Tipe Media

other

Tipe Pembawa

unspecified

Edisi

-

Subjek

Oseanografi

Info Detail Spesifik

-

Pernyataan Tanggungjawab

-

Versi lain/terkait

Lampiran Berkas

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