Ilse Van Opzeeland¹, Ramona Mattmueller¹, Joseph Hoffmann² and Karolin Thomisch³, (1)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Physical Oceanography - Ocean Acoustics Group, Bremerhaven, Germany, (2)University of Bielefeld, Biology Faculty - Molecular Ecology Lab, Bielefeld, Germany, (3)Alfred Wegener Institute for Polar and Marine Research, Physical Oceanography - Ocean Acoustics Group, Bremerhaven, Germany