Data Trawler - Project details

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Project details

Title: Cloud Aerosol Precipitation Radiation Interactions eXperiment (CAPRIX)
Id: 2586
Short Name: CAPRIX
Investigator(s): Alain Protat
Bureau of Meteorology [details]

Description: Cloud microphysical properties produced from the competition between supercooled liquid and ice particles for water vapour in subfreezing cumulus clouds over the Southern Ocean and off the coast of Antarctica have been directly linked to errors in absorbed solar radiation at the sea surface, which have been further linked to uncertainty in predicting global climate sensitivity under CO2 warming and sea surface temperature biases in climate models.
Description (full): The proposal is to collect a suite of aerosol, cloud, surface radiation, surface eddy momentum, heat and moisture fluxes, and precipitation observations in areas characterized by high ocean productivity and to continue to build a comprehensive understanding of the relationship between ocean productivity, aerosol formation, cloud microphysics and then link to rainfall properties and surface radiation.
Years: 2020 to 2022

List of surveys that this project was on. Click on column header to sort.

Use [details] link to view survey details (map, reports, metadata etc) including links to download data.

Survey InvestigatorDescription

Alix Post (GA) This study has two main scientific objectives: i) to understand past changes in Antarctic Bottom Water (AABW) production using long sediment cores from the continental slope over multiple warm periods during the Pleistocene; ii) develop an improved bathymetry model to support oceanographic modelling of AABW pathways. Sediment core records of previous warmer interglacials will provide an analogue for understanding the impact of any future changes in bottom water production associated with a warming climate. This project will recover long sediment cores from the shelf and slope off Cape Darnley to provide palaeoceanographic records over multiple glacial-interglacial cycles, including previous interglacials when Antarctic air temperatures were 2 to 4.5°C warmer than today. A multi-proxy approach, combining sedimentological, geochemical and biological proxies, will provide evidence of the nature and timing of past changes in AABW formation, and associated variations in meltwater input, and the extent of the Cape Darnley polynya. AABW has previously been associated with unique and diverse benthic ecosystems, including hydrocorals. We will investigate the presence and distribution of hydrocorals, and, if present, analyse their carbonate skeletons to understand past water mass variability over recent centuries, complementing the sediment core records.

Shadwick (CSIRO O&A) The Southern Ocean has a predominant role in the movement of heat and carbon dioxide into the ocean interior, moderating Earth’s average surface climate. The IMOS - SOTS moorings are designed to remotely and automatically measure these oceanographic processes under extreme conditions, where they are most intense and have been least studied. The atmosphere-ocean exchanges occur on many timescales, from daily insolation cycles to ocean basin decadal oscillations and thus high frequency observations sustained over many years are required. The current context of anthropogenic forcing of rapid climate change adds urgency to the work.

Dr Kawaguchi (AAD) The primary objective of this voyage is to ensure the orderly development of the krill fishery in waters off Australia’s Antarctic Territory. This will be achieved by updating the biomass estimate of Antarctic krill, enabling a revision of the catch limit within CCAMLR Division 58.4.2-East in the Indian Ocean (IO) sector of the Southern Ocean. Commercial krill fishing in the IO sector recommenced in 2016/17 after a 25 year hiatus. The current krill catch limit in the region is based on surveys conducted 14 years ago. There has been no regular ecosystem monitoring to assess how the system may have changed since then.

Prof. Philip Boyd (UTAS) Voyage objectives: 1) A modular 3.5 day cycle of diverse water column activities from deployment and recovery of surface tethered free floating moorings (RESPIRE, particle sediment traps), to deployment from the ship of CTD, profiling cameras, net tows, ISP’s, and water sampling to run lab based experiments. This cycle will be repeated 3 times at the subantarctic site (lower productivity and particle export) and 4 times at the polar site (bloom/bust and higher productivity and particle export). The mooring deployment / recovery is the most weather dependent event. Weather days will be factored in and may result in a modification of the number of cycles or their duration. In order to fully meet the multiple aims of the voyage we will carry out additional sampling (to add to our time series) on ‘weather days’ that we do not use for bad weather. 2) Land-based satellite oceanography will be linked to shipboard bio-optical and optical sampling for validation (within the 3.5 day cycle of 1) above). It will be further underpinned by the deployment of gliders (from collaborators at CALTEC, USA) – one at each site (recovered post voyage downstream off New Zealand by another vessel). Weather should be of little influence for these deployment activities across the 45 day voyage. 3) Deployment of two state-of-the-art BGC-ARGO profiling floats with miniaturised UVP (Underwater Vision Profiler) on a 5 year mission. The floats telemeter datasets and their output will be modelled by collaborators in Spain. If weather conditions permit we may attempt to retrieve each BGC-ARGO for a data download (using ‘Trull’ device – see equipment manifest for details). 4) SOLACE sits under the JETZON umbrella - . The site is currently being developed and we are already (in anticipation of our voyage) contributing to metadata development and modelling initiatives. 5) Conduct aerosol and rain sampling: a. ASP to provide advance notice of incineration events and a final record of incineration events for the voyage to both the aerosols and atmospheric teams. b. Require access to aerosol sampling lab. 6) Cosmic ray measurements from underway instrument (Dr Grahame Rosolen, CSIRO). 7) Cloud Aerosol Precipitation Radiation Interactions eXperiment (CAPRIX) (Dr Alain Protat, BOM). 8) Completion of noise signature testing (MNF). a. This will be completed in Storm Bay immediately following departure and will be structured so as not to impact science equipment testing in Storm Bay and the voyage schedule. 9) To complement the CTD casts and regular BGC Argo floats, underway instrumentation will be running and will require some estimate of the mixed layer depth to support these observations. To give subsurface temperature structure while the ship is in transit, deployment of 12 x XBTs to observe subsurface properties while the ship is in transit between the 2 sites will be undertaken. These deployments are not permitted occur within Australian Marine Parks (AMPs).
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