Ocean Sciences Meeting 2022

Virtual event.

Web page: https://www.aslo.org/osm2022/

GEOTRACES Town Hall:

TH33 Accessing and utilizing the GEOTRACES 2021 Intermediate Data Product (IDP2021)

The international GEOTRACES program aims to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions. GEOTRACES has just released a new intermediate data product (GEOTRACES IDP2021), combining data acquired during the first 10 years of the program. It contains datasets on trace elements that serve as micronutrients, tracers of continental sources to the ocean (e.g., aerosols and boundary exchange), contaminants (e.g., Pb and Hg), radioactive and stable isotopes used in paleoceanography and a broad suite of hydrographic parameters used to trace water masses. IDP2021 expands on, and includes, the collection of results from the Atlantic, Pacific, and Southern Oceans (IDP2014 and IDP2017) and includes new data from the Pacific, Arctic and Indian Oceans. In addition, IDP2021 includes a significant amount of BioGEOTRACES data on ligands, enzymes, and single cell quotas. IDP2021 will be of value to chemical, biological, and physical oceanographers, especially those interested in biogeochemical cycles and the impact of micronutrients on marine carbon cycling. This Town Hall will introduce IDP2021, explain how to access IDP2021, and include some highlights on the use of GEOTRACES data. The goal is to intensify collaboration within the broader ocean research community but also seek feedback from the community to help us improve future data products.

Lead Organizer: William Landing, Florida State University, wlanding@fsu.edu

Date and Time: Friday, 2/25/2022 11:00 AM to 2/25/2022 12:00 PM (US EST)
Location: Room 02

Programme:

GEOTRACES sessions:

CT01 Temporal Variability of Bioactive Trace Elements in the Ocean: Towards Constraining Drivers, Mechanisms and Timescales

Organizers:
Peter Sedwick, psedwick@odu.edu
Erin Black, erinb@ldeo.columbia.edu
Alessandro Tagliabue, a.tagliabue@liverpool.ac.uk
Simon Ussher, simon.ussher@plymouth.ac.uk

In the past decade, our understanding of the distribution of bioactive trace elements has improved greatly, advancing the development of numerical models that provide mechanistic insight and predictive capability. However, in addition to establishing the spatial distribution of biologically active trace elements, it is equally important to understand their temporal variability. Such information provides critical constraints on the mechanisms that control the biogeochemical cycling of these elements, and allows the assessment and expansion of numerical modeling efforts. In this session, we invite interdisciplinary contributions from both observationalists and modelers that examine the time variation of bioactive trace elements in the ocean, from both chemical and biological perspectives, over timescales ranging from daily to millennial.

CT03 Advances in understanding of the biogeochemical processes shaping the basin-scale distributions of trace elements and their isotopes

Organizers:
Tim Conway, tmconway@usf.edu
Lauren Kipp, kipp@rowan.edu
Jessica Fitzsimmons, jessfitz@tamu.edu
Greg Cutter, gcutter@odu.edu

A range of important trace elements act as micronutrients, toxins, or tracers throughout the global oceans. The distributions of these trace elements are shaped by a range of biotic and abiotic processes including external sources and sinks, microbial uptake and regeneration, exchange with particles, and physical circulation of the oceans. In recent years, field programs such as GEOTRACES, CLIVAR, and SOLAS have hugely expanded the available datasets of trace elements and their isotopes (TEIs) throughout the oceans. These and other datasets are being used to determine the processes, sources, and sinks that control observed TEI distributions, and the transformations and rates of input, removal, and exchange associated with each process. Here, we invite submissions of abstracts using ocean transect, field, laboratory, or modelling datasets that focus on the distribution, isotopic composition, speciation, and cycling of TEIs at the basin-scale, as well as abstracts which use geochemical tracers to interrogate the internal cycling and source/sink processes which shape these basin-scale distributions or transform TEIs within the ocean. In addition to studies that yield insights into the current distributions and cycling of TEIs, we also invite submissions that investigate how the oceanic cycling of TEIs may change in response to the changing oceans and warming climate.

CT10 Sources, sinks, and cycling of trace elements in coastal and near-shore systems

Organizers:
David Janssen, janssen.davej@gmail.com
Veronique Oldham, voldham@uri.edu
Emily Estes, estes@iodp.tamu.edu

The terrestrial-ocean continuum regulates the delivery of trace elements to the global ocean; however, important gaps remain in understanding the complex cycling of trace elements in coastal systems. Further, coastal systems face significant pressure from anthropogenic climate change, nutrient loading, and inputs of environmental toxins. This session aims to connect GEOTRACES-style studies on distributions of trace elements with studies examining processes and cycling of trace elements in nearshore environments to better bridge the terrestrial-ocean continuum. We invite contributions examining the cycling of trace elements and their isotopes in rivers, wetlands and estuaries; inlets, marginal seas and inland seas; and the near-shore coastal ocean. Field, laboratory, and modelling studies of trace element distributions, speciation, biological transformations, sources and sinks, and pollution & remediation are welcome. We particularly encourage studies (1) on the transport of terrestrially-sourced metals and dissolved organic matter to near-shore environments; (2) on metal fluxes to and from shelf sediments; (3) linking processes regulating near-shore trace element availability and their impact on the biosphere; and (4) investigating natural and anthropogenic perturbations on trace element cycling in these systems.

CT11 Mercury transformations in marine ecosystems

Organizers:
Eric Capo, eric.capo@hotmail.fr
Amina Schartup, aschartup@ucsd.edu
Heyu Lin, heyu.lin@student.unimelb.edu.au
Lars-Eric Heimbürger, lars-eric.heimburger@mio.osupytheas.fr

Mercury (Hg) is a naturally occurring element that has been mined and released by humans for millennia. Inorganic Hg is released by natural processes such as volcanic activity, and also by human activities which have largely outweighed natural ones. We have known for half a century that methylmercury is naturally formed in marine sediment and water column from inorganic Hg and is a potent neurotoxicant. The majority of global methylmercury exposure for human populations is from marine ecosystems due to its bioaccumulation in predatory fish at levels that are a million times, or more, higher than seawater. Yet our understanding of abiotic and biotic Hg transformations in marine systems is still limited. A greater understanding of the microbial reactions and geochemical conditions conducive to the formation and degradation of methylmercury is needed to mitigate its impacts on the health of fish-consuming wildlife and human populations. This session invites presentations on Hg transformations in marine ecosystems.

OB20 Towards BioGeoSCAPES: Linking cellular metabolism with ocean biogeochemistry

Organizers:
Adrian Marchetti, amarchetti@unc.edu
Yoshiko Kondo, yoshikondo@nagasaki-u.ac.jp
Naomi Levine, n.levine@usc.edu
Dalin Shi, dshi@xmu.edu.cn

BioGeoSCAPES is an international program initiative aimed at integrating knowledge on organism identity and physiology within frameworks of community ecology and global ocean biogeochemistry. It is envisioned that an improved, predictive, and quantitative understanding of ocean metabolism on a changing planet can be achieved by combining detailed information on plankton (i.e., virio-, bacterio-, phyto- and zoo-) cell status, biochemical processes, and species interactions with intercalibrated measurements of nutrient fluxes, concentrations, and speciation (e.g., macronutrients, including inorganic and organic carbon, micronutrients and vitamins). We invite contributions describing research that can serve as inspiration for this nascent program. Appropriate abstracts could include: studies that integrate cellular metabolism through physiological and ‘omics approaches (e.g., genomic, transcriptomic, proteomic, metabolomic, metallomic, lipidomic, etc.) with biogeochemical measurements, including fluxes; or studies that scale from the cellular to the ecosystem level through integrated field measurements or mechanistic models of interactions. With the COVID-19 pandemic significantly impacting field research opportunities, we are particularly interested in laboratory and modelling studies that provide new insights into BioGeoSCAPES-related topics across different scales of time and space.

HL11 Arctic Ocean processes, progress, and potential explored through synthesis supported research

Organizers:
Laura Whitmore, lmwhitmore@alaska.edu
Laramie Jensen, jensenla@uw.edu
Ryan McCabe, rmccabe.ocean@gmail.com

Session Abstract:
The Arctic Ocean is changing rapidly as a result of global climate change at rates disproportionate to other ocean basins. Changes in stratification, circulation, and ice cover are giving way to a cascade of biogeochemical and ecological changes that are altering the character of the Arctic Ocean. These changes influence the global ocean by modulating freshwater export from the Arctic Ocean to the North Atlantic Ocean, the transfer of chemical constituents, and the connectivity of organismal populations. Because of continued annual sea ice coverage and accessibility barriers; data collection across small (seasonal) and larger (annual to decadal) timescales has been historically difficult. In order to elucidate and ultimately predict the impacts of climate change on the Arctic Ocean system a synthetic and trans-disciplinary effort is valued. In this spirit, we encourage submissions across ecological, chemical, physical, and geological sub-disciplines with special consideration to interdisciplinary approaches and to studies investigating spatial and/or temporal scales.