Geoacoustic inversion using explosive air gun signals received by a single hydrophone in the East Siberian Sea, Arctic Ocean

Goacoustic inversions using low-frequency impulsive sources in shallow water have been recently performed to estimate geoacoustic parameters of sediments. In this talk, we present the geoacoustic inversion results estimated using explosive air gun data received by a single hydrophone in the East Siberian Sea in September 2019. The single hydrophone was deployed by the Korean icebreaker R/V Araon operated by Korea Polar Research Institute. The geoacoustic inversion is carried out by extracting modal dispersion curves from air gun data received from tens of km. A signal processing method called warping is applied to separate normal mode components and then the extracted dispersion curves are compared to the replicas predicted by the KRAKEN normal mode program. Although it was not possible to compare to in situ measurements of sediment, our inversion results are valuable in that they provide indirect information about geoacoustic parameters of the Arctic Ocean. [This research was a part of the project titled ‘Korea-Arctic Ocean Warming and Response of Ecosystem (K-AWARE, KOPRI, 1525011760)’, funded by the Ministry of Oceans and Fisheries, Korea and supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2020R1A2C2007772).]