Michael Dinniman
ABSTRACT Subject :
The impact of simulated diel vertical migration and sea ice drift on the connectivity of krill in the Ross Sea
Tipe of Presentation: Oral
Topic: Marine biology and ecology
COAUTHORS :
Kim Bernard
Oregon State University
State : USA
e-Mail : kim.bernard@oregonstate.edu
Cassandra Brooks
University of Colorado
State : USA
e-Mail : Cassandra.Brooks@colorado.edu
Victor Pham
Virginia Beach City Public Schools Environmental Studies Program
State : USA
e-Mail : vpham329270@gmail.com
Zephyr Sylvester
University of Colorado
State : USA
e-Mail : Zephyr.Sylvester@colorado.edu
Sally Thorpe
British Antarctic Survey
State : UK
e-Mail : seth@bas.ac.uk
Abigail Williams
Virginia Beach City Public Schools Environmental Studies Program
State : USA
e-Mail : abigail@lxmr.org
Abstract Published : 14/02/2023 21:30:07
Download the Abstract
The Ross Sea region contains one of the healthiest marine ecosystems on the planet. In 2016, the Commission on the Conservation of Antarctic Marine Living Resources created one of the largest Marine Protected Areas (MPA) in order to protect “the structure and function” of this ecosystem. As part of a study to examine the movement of one particular species, Antarctic krill (Euphausia superba), between and within key regions of the Southern Ocean including the Ross Sea MPA, we are modeling Lagrangian drifters to simulate pathways during early life stages. The simulated drifters are embedded within a 5-km horizontal resolution ocean/sea ice/ice shelf Regional Ocean Modeling System circulation model of the Southern Ocean. The drifters include simplistic behavior of the early life stages of krill including the initial descent/ascent cycle, diel vertical migration (DVM), and advection with simulated sea ice velocity (instead of ocean velocity) under certain conditions. It has been previously shown (e.g. Behrens et al., JGR, 2021; Hudson et al., JGR, 2022) that advective pathways of simulated drifters can change significantly when sea ice advection or DVM is added. Here, we explore changes in the pathways in the Ross Sea when changes are made to when sea ice advection occurs, when and to what depth DVM occurs, and the vertical rates in the initial descent/ascent cycle based on krill physiology. For example, when sea ice advection is added to the krill behavior, drifter pathways are less constrained to stay along the continental slope in areas where sea ice is advected off the continental shelf, and this changes the number of drifters that transit through specific parts of the Ross Sea MPA.