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Free-drifting icebergs as proliferating dispersion sites of iron
enrichment, organic carbon production and export in
the Southern Ocean

Terms and Definitions

ablation: Ice from the iceberg that sloughs into the sea. (Back)

AGUNSA Warehouse: AGUNSA is the Chilean contractor that supports USAP activities out of Santiago and Punta Arenas. (Back)

Clarence Island: An island located off the northern-most tip of the South Shetland Islands and the Bransfield Strait. (Back)

current profiles: The rate and in which direction the water is moving, horizontally at different depths in the water column? (Back)

dogged: secure the latches that help keep the ships' exterior doors water-tight. (Back)

ectoenzyme: enzymes on the bacterial cell surface or that are excreted by bacteria into the surrounding environment to degrade polymers of food such as sugars and proteins for transport into the cell. (Back)

far-field: outside the iceberg's zone of influence (IZI. (Back)

free-drifting icebergs: Icebergs that are not grounded and are free of seasonal pack-ice. (Back)

iceberg’s zone of influence: The region that exhibits physical, chemical, and biological effects from the iceberg. (Back to home pageBack to April 1 blog)

iron-binding ligands: Many questions remain about these important components in iron availability, but researchers believe they are of direct biological origin, relatively small molecules that "scavenge" iron and aid in its dissolution, making it bio-available to both bacteria and phytoplankton. (Back)

micronutrients such as iron: Such micronutrients occur as wind-deposited dust and eroded rock that are entrained in glacial ice from which the icebergs originate. (Back)

near-field: within the iceberg's zone of influence (IZ). (Back)

organic matter: Specifically, organic matter resulting from primary production by phytoplankton and waste products from bacterio-, phyto-, and zoo-plankton, (krill), and seabirds. (Back)

protein production assay: The rate at which tritiated leucine, a radio-labeled amino acid, gets incorporated into growing protein molecules can be used to determine the bacterial activity in the LST samples in addition to the many water samples we collected. (Back)

Raytheon Polar Services Company (RPSC): The contractor that provides US-based logistics, and at-sea and on-the-ice support for USAP. (Back)

reference samples: Samples that represent the ocean water free of potential inputs, flux, and other effects inferred by the presence of free-drifting icebergs. (Back)

surface mapping data: water chemistry and biology samples collected from surface water at specific points along a course that map the surface chemistry of a region of water. (Back)

ROV: remotely operated vehicle. (Back)

tabular: a flat-topped, mesa-like iceberg, typically much greater in length relative to its height. (Back)

trace-metal standard: a cleaning protocol accepted in the published science world that includes soap and acid washes and rinses, in which no metal objects or surfaces come into contact with the sample containers. (Back)

UAV: unmanned aerial vehicle. (Back)

upwelling: The cycling of water from deeper to shallower regions within the water column. (Back)

Weddell Sea: The Weddell Sea is located east of the Antarctic Peninsula, between 62.5 - 65°S latitude and 10-50°W longitude. (Back)