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Additional file 1 of Ocean depth–temperature profiles for operational oceanography from a shark-borne transmitter

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posted on 22.11.2022, 10:07 authored by Kim Holland, Carl Meyer, James Potemra, Melinda Holland
Additional file 1: Figure S1. Broken Stick algorithm applied to archived depth/temperature and depth/oxygen curves. The broken stick algorithm (“transmitted”) used in the current SCOUT tag implementation is overlaid on the most recent archived profiles of oxygen saturation and temperature from a recovered pop-up tag. In this case, the broken stick curve was fitted with six points as opposed to eleven used in the case reported here. Figure S2. Conceptual rendering of translation of dive behavior into a broken stick temperature profile. In this stylized dive and surfacing event (blue line) temperatures at the same depth (yellow arrows) are overwritten until the last values stored (red numbers) are used to create the virtual upcast temperature profile (red line). Values imported here from the top panel (red dots) are among many hundreds comprising a typical upcast profile. Inflection points on the upcast (blue squares) are used to construct the eleven-point transmitted broken stick profile (black squares, inset). Figure S3. Upcast creation and time discontinuities. Temperatures are recorded every second throughout the dive but only the values in blue are used to create the virtual upcast. Dashed line shows temporal discontinuities. In the current study, any discontinuity greater than 1 h resulted in a ‘discontinuity flag’ appearing in the broken stick profile. Figure S4. Profile 38 was constructed between 0746 and 0801 (i.e., 15 min + 15 min) on 5/12/21 and transmitted from a Fastloc-derived location approximately 1.6 km south of Kewalo Basin, Oahu. The profile originated at 256 m. Assuming the slowest ascent rate (30 min), average ascent rate = 8.5 m/min (2.9 body lengths/min).

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