Open AccessVariation of seawater properties on tidal-scale in the entrance of Padangbai Lombok Strait Indonesia
Author(s) -
Yulianto Suteja,
Agus S. Atmadipoera,
M. N. Natih,
Marlin Chrisye Wattimena,
V. C. Masoleh,
Y. Pranoto,
D. Adhyatma,
P. Widiastuti,
S. R. Deswanti,
Airin Triwahyuni,
Hidetaka Watari,
Amandangi Wahyuning Hastuti,
Asep Ma’mun,
Anda Vladoiu,
Chonnaniyah
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/429/1/012016
Subject(s) - seawater , turbidity , oceanography , bay , water mass , flood myth , geology , chlorophyll a , environmental science , atmospheric sciences , geography , chemistry , biochemistry , archaeology
During Marine Science Summer Course 2017, a continuous 24-h conductivity-temperature-depth (CTD) “yoyo” measurement has been carried out at the entrance of Padangbai Lombok Strait to investigate seawater properties variations on semidiurnal tidal-scale which is dominant in the strait. The SBE CTD 19 plus is equipped with optional sensors such as pH, turbidity and chlorophyll-a derived-fluoro. During 24-h field observation, 15 CTD casts from sea surface to about 60 m depth have been acquired. It is shown that observed seawater properties fluctuate strongly four times a day, following semidiurnal-tide period with two flood-tide and two ebb-tide conditions. During flood-tide, water mass is derived from open strait with colder, saltier, denser and low dissolved oxygen characteristics. In contrast, during ebb-tide, local water mass is recirculated back from the inner bay to the open strait. It is interesting to note that fluctuation of chlorophyll-a indicates a diurnal signal. In addition, fluctuation of pH, turbidity and dissolved oxygen showed a weak semidiurnal signal.