Upwelling Systems
Representatives
Team members
Present understanding
Upwelling systems, both coastal and equatorial, are natural laboratories for studying the impacts of multiple stressors on air sea-exchange processes and marine ecosystem services. These systems are characterised by very high biological productivity closely related to the presence of an extensive oxygen minimum zone (OMZ) and a low pH-high CO2 regime. Active research during recent decades has determined the role of upwelling systems in the exchange of climatically active gases (such as CO2, N2O, and CH4), OMZ variability, and the biogeochemical cycles of nitrogen, carbon, sulphur, halogens and trace metals.
Priorities
Planned activities
Current national and international programmes investigating upwelling include "Role of Eddies in the Carbon Pump of Eastern Boundary Upwelling Systems" (REEBUS), "Biogeochemical impact of mesoscale and sub-mesoscale processes along the life history of cyclonic and anticyclonic eddies (e-IMPACT)", and SCOR WG 155 on Eastern boundary upwelling systems (EBUS): diversity, coupled dynamics and sensitivity to climate change.
● SOLAS Summer School 2023, 5-16 June 2023, Mindelo, Cabo Verde, with special sessions on upwelling. https://www.solas-int.org/events/summer-school-22-23.html
● WCRP's Open Science Conference, 23-27 October 2023, Kigali, Rwanda. https://wcrp-osc2023.org/
● GOOD-OARS-CLAP-COPAS Summer School 2023, 6-12 November 2023, La Serena Chile, with focus on the Humboldt system. http://www.ceaza.cl/summerschool/
● FUTURO Large International Field Campaign in Canary Current EBUS, time window: 2027-2029, currently in early planning state
● 3rd GO2NE/GOOD/OARS Summer School, summer 2025, Universiti Sains Malaysia, Penang, Malaysia
● OceanICU campaign, from South Africa upwelling to the Canary Current Upwelling, Spring 2025
Polar Oceans and Sea Ice
Representatives
Team leaders
Team members
Present understanding
Changing sea-ice coverage in the polar oceans is impacting air-sea exchanges of chemically, biologically, and climatically active trace gases and particles. The dynamics and consequences of changes in sea-ice characteristics and distribution in the polar oceans are critical to understanding and modelling feedback mechanisms and future scenarios of climate change, including mechanisms of Arctic Amplification of climate change. Sea ice, including the overlying snowpack, is a rich and complex system that actively exchanges heat, momentum, and material (i.e., gases and particles) with both the atmosphere and the underlying water, and impacts exchanges in surrounding waters. Sea ice harbors a highly productive ecosystem, which interacts with both the ocean and the atmosphere and supports multiple ecosystem services. Understanding changes to the system is crucial in understanding potential impacts on these ecosystem services. The snowpack on sea ice is a highly reactive environment controlling uptake and release of many photochemically active trace gases, particles and their precursors, interacting with the lower atmosphere and the sea ice underneath. Understanding emission and deposition fluxes above snow on sea ice is critical to assess the impact of a changing sea-ice environment on atmospheric composition (oxidising capacity, budgets of mercury, halogens, sulfur, nitrogen and organics), aerosol direct and indirect effects, and climate. In addition to changes to sea-ice itself, the transition from a permanent to a seasonal ice cover leads to drastic changes in ocean stratification, biological activity, and exchange processes between ocean and atmosphere.
Much of the current information about sea-ice characteristics, surface temperatures, and clouds in polar regions is obtained from remote sensing instruments on polar-orbiting earth-observation satellites, of which there are many. Increasing numbers of deployments of satellite platforms with polar orbits (by both government and private organisations, e.g. three versions of the current NOAA polar orbiters: Suomi-NPP, NOAA-20 and NOAA-21, multiple versions of the Sentinel polar orbiters), new instruments (e.g., METimage of EUMETSAT, European CIMR - Copernicus Imaging Micowave Radiometer- with much improves spatial resolution), and instrument algorithm improvements are expected to continue to result in higher accuracy in the retrieved variables to the benefit of SOLAS polar objectives. However, challenges in observing these variables in remote Antarctic and Arctic regions leads to a lack of observations, particularly in winter and spring, making accuracy assessments of satellite measurements difficult. Challenges in remote sensing remain also due to the high presence of clouds.
Priorities
The primary SOLAS priority in polar research is to understand how the structure of sea ice impacts the uptake and release of climatically-active substances to/from the atmosphere and the underlying water. This involves exploring the changing nature of ice, which is generally becoming thinner and warmer, leading to increased fracturing and lead formation, expansion of the marginal ice zone (only little is known about the open lead transfer function or fluxes of trace gases and sea spray containing climatically active particles). In the Arctic, increasing pack ice mobility and rafting is potentially redistributing sympagic biological communities throughout the ice. Melt ponds, which are now becoming increasingly prevalent already in spring and show shifts from pure freshwater to biologically active environments in summer in the Arctic, may also represent a significant albeit poorly quantified source of gases and particles to the atmosphere. Thinner ice and enhanced snowfall can cause flooding and snow-ice formation, which are common in the Southern Ocean and becoming more so in the Arctic, impacting both ice biology and chemistry, thereby also affecting the physical exchange of mass and energy between the underlying ocean and the atmosphere. Seasonalities in the amount and phase of precipitation as well as melt onset timing are changing, leading to warmer and wetter snowpacks, which may dampen or even shut down ice-air trace gas and particle fluxes. On the other hand, increased flooding and saltier first year ice may increase salt loading of the snow, with unknown impact on photochemical processes and air-snow fluxes of trace gases, particles, and their precursors. Effects of sea ice and snow meltwater on the physical, chemical, and biological properties of surface water are not well known, especially for gas exchange in leads and melt ponds. The extent to which sea-ice brines directly contribute to deep-ocean carbon sequestration is also still unresolved. Answering these questions requires both detailed process studies (lab, field, and numerical) and integrated, large-scale observation systems. Developing adequate model parameterisations which allow models on a variety of scales to represent ocean-ice-snow-atmosphere interactions in a changing climate, including the mechanisms for Arctic/polar amplification, remains a challenge and depends heavily on advanced process understanding and collaborative efforts among observers and modellers. Finally, sea ice features in both the mechanisms and hoped-for outcomes of many climate intervention proposals, but such proposals cannot be properly evaluated or monitored without a better understanding of how variations in sea ice distributions, characteristics, biology, and chemistry feedback on the climate system.
Planned activities
A research community co-sponsored by SOLAS, CliC, and SCAR, BEPSII focuses on how the biogeochemistry of sea ice influences both the ocean and the atmosphere. Within sea ice, biotic and abiotic processes interact in changing ways throughout the freeze-melt cycle, and thus, sea ice is an active participant in the biogeochemical cycles of many elements, producing climatically active atmospheric aerosols, modulating the surface ocean ecosystem, contributing to seasonal gas fluxes, and possibly facilitating long-term export and carbon dioxide sequestration in deep waters. Near-future priorities for BEPSII include:
- A position analysis (PA) on Antarctic sea-ice biogeochemical responses to climate change (An Arctic PA has been published in Nature Climate Change)
- A policy brief on Antarctic sea-ice biogeochemical responses to climate change, summarising the Antarctic PA and ecosystem services impacts (An Arctic policy brief has been published in 2021 and presented at the COP26)
- Presentation of the impacts of sea-ice loss on ecosystems and humans at COPs (focused sessions have been organised for COP27, COP28 and COP29)
- 1-D and 3-D model intercomparison (Ice Algae Model Intercomparison Project Phase 2 is currently in progress)
- Methodology and technology developments for sea ice research
- Coordinated research planning for the 2032-33 International Polar Year
- SCOR working group (Cice2Clouds ##163; https://www.cice2clouds.org/)
- BEPSII-CIce2Clouds-CATCH sea ice school will be held in 2026 (end of February to beginning of March) in Saroma-ko Lagoon, Hokkaido, Japan
- Development of a new science plan
- The continuation of data collation for improved system understanding and model development and validation.
- Providing informed responses on geoengineering initiatives in sea-ice associated ecosystems.
- Producing a semi-regular newsletter to improve communication with our network.
BEPSII held their 2024 meeting online and will hold a hybrid meeting in Barga, Italy, just after the Gordon Conference on Polar Marine Science. Website: https://sites.google.com/site/bepsiiwg140/home
Cosponsored by SOLAS and IGAC, the CATCH mission is to facilitate atmospheric chemistry research within the international community, with a focus on natural processes specific to cold regions of the Earth. Cold regions include areas that are seasonally or permanently covered by snow and ice, from the high mountains to the polar ice sheets and sea-ice zones, as well as regions where ice clouds are found. Upcoming and ongoing activities and priorities for CATCH include:
- IPY planning workshop, Aussois - Nov 2024
- SOLAS Ocean-sea ice-atmosphere interaction discussion session, Goa - Nov 2024
- Faraday Discussion on Atmospheric Chemistry in cold environments, London - Jan 2025
- ICARP IV discussion session, Colorado, USA - Feb 2025
- EGU joint CATCH, CIce2Clouds session, Vienna - Apr/May 2025
- Sea ice school in Saroma-ko Lagoon, Hokkaido, Japan - End of Feb 2026
- Model Intercomparison Project - bromine in polar (Arctic) regions
- Special issue/ review of chemical fluxes between ocean, sea ice, snow and atmosphere
- FAIR and open data management for CATCH science
- PICCAASO (Partnerships for Investigating Clouds and the Chemistry of the Atmosphere in Antarctica and the Southern Ocean) working group
- ARTofMELT (Atmospheric rivers and the onset of sea ice melt) working group
- International Polar Year 2032-33 Strategy & Planning working group
- SCOR working group (Cice2Clouds ##163; https://www.cice2clouds.org/)
- Monthly CATCH newsletter
- CATCH seminar series(1-2 months)
Website: https://www.catchscience.org/
PICCAASO (Partnerships for Investigating Clouds and the biogeoChemistry of the Atmosphere in Antarctica and the Southern Ocean).
PICCAASO's mission is to amplify the scientific discovery of the many upcoming projects occurring in the Antarctic and Southern Ocean region by facilitating global collaboration and coordination. PICCASO's specific focus is on the scientific questions surrounding the link between biogeochemistry and atmospheric processes in this pristine region. PICCAASO evolved from a CATCH working group into an independent initiative after 2021. At the outset of this initiative, we have identified 16 long-term stations in the region, together with 21 intensive research projects, either fully funded or proposed, occurring before the end of 2025. Upcoming and ongoing activities and priorities for PICCAASO include:
- Positioning paper published in Elementa (Mallet et al 2023)
- Currently updating website to include new collaborative studies and existing campaign updates in the SO/Antarctica
- Submitted proposal for Copernicus cross-journal special issue on PICCASSO science
- Data availability resource at SO/Antarctic sites: Goal to gather info on all of similar types of datasets in a shared place to put on the website as a resource to Southern High Latitude researchers
- Data request for CMIP7 for PICCAASO
- Quarterly PICCAASO newsletter
- SOLAS Ocean-sea ice-atmosphere interaction discussion session, Goa - Nov 2024
The objective of the CRiceS project is to deliver improved understanding of chemical, biogeochemical, and physical interactions within the ocean-ice/snow-atmosphere system in order to quantify their role in polar and global climate, including feedbacks and teleconnections, to predict the consequences and impacts of change.
The specific objectives of CRiceS are to:
- Quantify key uncertain processes that control the polar ocean-ice/snow-atmosphere system, using existing and planned observations including in-situ data, satellite observations and data services for both poles
- Deliver improved descriptions of key ocean-ice/snow-atmosphere processes in process models and climate models/ESMs that operate on seasonal to climate timescales and local to global spatial scales
- Systematically quantify polar-global teleconnections in both hemispheres, how they are modified by natural and anthropogenic drivers of climate change and their governing physical processes and feedbacks
- Deliver improved projections that directly feed into regional and global climate change assessments relevant for EU policy development that can be used to quantify climate impacts relevant for society
Cice2Clouds, SCOR working group (#163) was developed from the BEPSII and CATCH communities to investigate feedbacks between atmospheric chemistry and sea-ice biogeochemistry. The CIce2Clouds mission is to bring the sea-ice and atmospheric communities together to resolve open questions about the impacts of the marine cryosphere on atmospheric chemistry in polar ocean environments.
CIce2Clouds objectives are to:
- Prioritise key coupled biological and chemical systems that drive atmospheric reactive trace gas, aerosol, and cloud properties in polar ocean environments
- Identify similarities and differences in controls on exchange processes between the Arctic and Antarctic O-SI-S-A systems
- Develop a conceptual model of exchange processes in O-SI-S-A systems, focusing on prioritised key reactive trace gas and aerosol species
- Develop interdisciplinary campaign planning recommendations to guide future studies and address model and measurement gaps
- Facilitate community and capacity building opportunities for sustainable multidisciplinary science at the O-SI-S-A interface
CIce2clouds active projects include:
- Synthesis papers on the coupled ocean-ice-snow-atmosphere cycling of primary aerosols and sulfur.
- A tutorial paper on fundamental concepts in coupled ocean-ice-snow-atmosphere research
- A joint campaign-planning white paper
- A special feature in the journal Elementa
- A hybrid online-in person meeting was held in Grenoble in 2023 and another will be held in Goa, November 2024, before the SOLAS OSC. Online meetings are held on a continuing basis for various subgroups.
Research highlights
1. Position Analysis Arctic sea ice ecosystems
Lannuzel, D., Tedesco, L., van Leeuwe, M., et al. (2020). The future of Arctic sea-ice biogeochemistry and ice-associated ecosystems. Nat. Clim. Chang., 10, 983–992. https://doi.org/10.1038/s41558-020-00940-4
2. Implications of sea ice management for Arctic biogeochemistry
Miller, L., Fripiat, F., Moreau, S., et al. (2020), Implications of sea ice management for Arctic biogeochemistry. Eos, 101. https://doi.org/10.1029/2020EO149927
3. Climate change impacts on sea-ice ecosystems and associated ecosystem services
Steiner, N.S., Bowman, J., Campbell, K., et al. (2021). Climate change impacts on sea-ice ecosystems and associated ecosystem services. Elem. Sci. Anth., 9(1): 00007. https://doi.org/10.1525/elementa.2021.00007
4. Picasso position paper
Mallet, M.D., Humphries, R.S., Fiddes, S.L., et al. (2023). Untangling the influence of Antarctic and Southern Ocean life on clouds. Elem. Sci. Anth., 11(1): 00130. https://doi.org/10.1525/elementa.2022.00130 (N. Steiner contributor)
5. SOLAS Synthesis paper: Polar oceans and sea ice in a changing climate.
Willis, M.D., Lannuzel, D., Else, B., et al. (2023). Polar oceans and sea ice in a changing climate. Elem. Sci. Anth., 11(1), 00056. https://doi.org/10.1525/elementa.2023.00056
6. BEPSII Policy Brief - Arctic
2021, BEPSII Arctic Policy brief: Effective Arctic climate change mitigation and adaptation strategies require consideration of biogeochemical and ecological impacts of sea-ice decline, https://doi.org/10.5281/zenodo.5595254.
For papers in the second BEPSII Special Feature in Elementa, see https://online.ucpress.edu/elementa/collection/8273/Special-Feature-Insights-into-Biogeochemical
Indian Ocean
Representatives
Team leaders
Team members
Present understanding
There have been significant advances in our ability to describe and model the Indian Ocean in recent years. For example, observations and modelling studies have confirmed that the Indian Ocean is warming faster than any other ocean besides the Arctic Ocean. The marginal seas around the Indian Ocean, such as the Red Sea and the Persian Gulf, also show high rates of warming suggesting a region-wide amplification effect. Observations also show considerable changes in deoxygenation, acidification, eutrophication, dynamics and productivity in the Indian Ocean. Due to increasing anthropogenic activities, the atmospheric composition and the ocean-atmosphere exchange over the Indian Ocean are also changing.
However, our understanding of oceanic and atmospheric processes in the Indian Ocean region is still rudimentary in many respects. This is largely because the Indian Ocean remains under-sampled in space and time, especially compared to the Atlantic and Pacific Oceans. The lack of sustained observation programs across the basin limits our understanding, which is currently based on episodic projects. The Indian Ocean is a dynamically complex and highly variable system, which is different from the other oceans because it shows a strong influence of and on the monsoon system. The air masses over the Indian Ocean change drastically in terms of continental influence depending on the season. With fast changes being observed, many uncertainties remain regarding how oceanic and atmospheric processes affect climate, extreme events, marine biogeochemical cycles, atmospheric chemistry, meteorology, ecosystems, and human populations in and around the Indian Ocean. Anthropogenic impacts of various pollutants lead to water quality deterioration and can have far-reaching detrimental ecosystem effects. There are growing concerns about food security, considering that countries with large populations surround the Indian Ocean. Thus, a detailed study of the Indian Ocean is needed in the context of the ongoing environmental changes to quantify the impacts of anthropogenic stressors on coastal environments and fisheries sustainability, especially in light of ocean utilisation projects planned by various countries in this region.
Priorities
The biogeochemical cycles and ecosystems of the Indian Ocean appear to be particularly vulnerable to anthropogenic impacts (including climate change, eutrophication, atmospheric pollution and aerosol load), the effects of which appear to be amplified as compared to other ocean basins. There are several global and regional phenomena, such as the Indian Ocean Dipole (IOD), Madden Julian Oscillation (MJO), and El Niño–Southern Oscillation (ENSO), which affect the Indian Ocean. This, in turn, affects the ocean-atmosphere exchange, which is still not well understood. It is essential to understand the underlying processes and drivers of these changes to predict the future of the Indian Ocean.
Major research questions to be addressed with high priority are:
- Which processes determine the natural variability of the biogeochemical cycles, ecosystems and atmospheric chemistry over the Indian Ocean?
- What are the effects of human-induced stressors (e.g., air pollution, extraneous nutrient input) on ocean biogeochemistry, ecosystems, atmospheric chemistry and climate, and why are these effects amplified in the Indian Ocean?
- How are ecosystem and basin-wide changes affecting monsoon circulation?
- How, in turn, are these changes affecting human populations?
- What role does the southern basin play in air-sea exchange, carbon cycling and climate?
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Planned activities
Sponsors
Funders