01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-02-0344 |
| Title of Abstract | Acoustic signatures and ecological patterns of sound scattering layers in a major upwelling system of the Indian Ocean |
| Authors | Myounghee Kang*, Jihoon Jung, Dongha Kang, Fredrich Simanungkalit, SungHyun Nam, Jung-Hoon Kang, Dong-Jin Kang |
| Organisation | Gyeongsang National University |
| Address | 2 Tongyeong Haeanro Tongyeong, Gyeongsangnamdo, Korea, Rep. Pincode: 53064 E-mail: mk@gnu.ac.kr |
| Country | Korea, Rep. |
| Presentation | Oral |
| Abstract | Sound scattering layers (SSLs), composed primarily of micronekton, are a common feature of the global ocean but remain poorly studied in the Seychelles⿿Chagos Thermocline Ridge (SCTR), a major upwelling system in the southwest Indian Ocean. To investigate SSL characteristics in relation to environmental and biological conditions, we conducted a research expedition aboard the RV Isabu from May 25 to June 21, 2024. During the cruise, hydroacoustic measurements (18, 38, 70, 120, 200, and 333 kHz, EK80), oceanographic profiles (conductivity⿿temperature⿿depth probe, SBE 911plus), and zooplankton samples (multi-net, 1 m ÿ 1 m) were collected. Integration of these datasets revealed diverse SSL structures linked to the unique hydrographic properties of the SCTR and the distribution of zooplankton. These findings provide new insights into the ecological dynamics of SSLs in this key region of the Indian Ocean. |
| Are you part of IIOE-2 endorsed project | yes |
| Endorsed Project Number | IIOE2-EP52 |
| Keywords | Sound scattering layer, Seychelles⿿Chagos Thermocline Ridge, hydroacoustics, zooplankton, Indian Ocean, upwelling system |
| For Awards | no |