CAJ | 학술논문

在中国第28次南极科学考察期间，利用“雪龙号”科考船载SIMRAD EK500（38 kHz）科学渔探仪对南极半岛附近海域的南极大磷虾资源量进行了调查。原始声学数据经过信噪比估算和背景噪声剔除数据后处理方法剔除背景噪声以及手动剔除表面混响、海底反射和坏数据之后，在200 m以浅水层中，以1 n mile间隔进行积分，并应用Matlab软件编程对积分结果进行后处理，得出调查海域中南极大磷虾的资源分布情况。结果表明：（1）“雪龙号”的平均噪声功率值为－146．47 dB re 1 W；（2）空白水体的噪声平均剔除百分比为88．3％；（3）调查区域内的南极大磷虾平均密度为27．30 g·m－2（62．95 ind·m－2）。
재중국제28차남겁과학고찰기간，이용“설룡호”과고선재SIMRAD EK500（38 kHz）과학어탐의대남겁반도부근해역적남겁대린하자원량진행료조사。원시성학수거경과신조비고산화배경조성척제수거후처리방법척제배경조성이급수동척제표면혼향、해저반사화배수거지후，재200 m이천수층중，이1 n mile간격진행적분，병응용Matlab연건편정대적분결과진행후처리，득출조사해역중남겁대린하적자원분포정황。결과표명：（1）“설룡호”적평균조성공솔치위－146．47 dB re 1 W；（2）공백수체적조성평균척제백분비위88．3％；（3）조사구역내적남겁대린하평균밀도위27．30 g·m－2（62．95 ind·m－2）。
The abundance of krill on the continental shelf and slope north of the Antarctic Peninsula was measured during the 28th Chinese Antarctic Research Expedition in the summer of 201 1—201 2.Acoustic data for the estimation of krill abundance were collected using an EK500 scientific echo sounder installed on the R/V Xuelong,using a 38 kHz operating frequency.However,the data were affected by significant electrical noise that had to be removed before integrating the mean volume backscattering strength (Sv).Noise correction and signal-to-noise-based thresh-olds were used for post-processing removal of noise from the acoustic data.Cell-size parameters of one ping and 70 samples were used to average the power data,a quantity equivalent to the Sv with no time varied gain applied.The signal-to-noise ratio (SNR)was defined as the original Sv minus the estimated maximal Svnoise ,such that 0 dB could be set as the minimum desired SNR.The results showed that the noise power averaged over all transects was-1 46.47 dB re 1 W and the average noise-removal percentage reached 88.3%.The mean biomass and numerical density in the survey area were 27.30 g·m-2and 2.95 ind·m-2,respectively.This study demonstrates that the R/V Xuelong is a useful platform to study the biomass and distribution of krill using acoustic methods.