We explored the frequency response of krill target strength (TS) to understand the Antarctic krill (Euphausia superba) and ice krill (Euphausia crystallorophias) using the stochastic distorted-wave Born approximation (SDWBA) model. The results showed that the distribution of orientation and the fatness factor could significantly impact on the frequency response of TS. Krill TS is clearly depended on acoustic properties, which could affect to estimate the biomass of two krill species. The results provide insight into the importance of understanding TS variation to estimate the Antarctic krill and ice krill biomass, and their ecology related to the environmental features in the Southern Ocean.

• 손우주(한국과학기술연합대학교대학원 극지과학과 학생) | Wuju SON (Student, Department of Polar Science, University of Science and Technology)
• 나형술(한국해양과학기술원 극지연구소 해양연구본부 책임연구원) | Hyoung Sul LA (Principal Research Scientist, Division of Ocean Sciences, Korea Polar Research Institute) Corresponding Author
• 오우석(전남대학교 수산과학과 대학원생) | Wooseok OH (Student, Division of Fisheries Science, Chonnam National University)
• 주종민(국가미세먼지정보센터 배출량조사팀 환경연구사) | Jongmin JOO (Environmental Researcher, Emission Inventory Management Team, National Air Emission Inventory and Research Center)