An updated compilation of published and new data of major-ion (Ca, Cl, K, Mg, Na, NO3, SO4) and methylsulfonate (MS) concentrations in snow from 520 Antarctic sites is provided by the national ITASE (International Trans-Antarctic Scientific Expedition) programmes of Australia, Brazil, China, Germany, Italy, Japan, Korea, New Zealand, Norway, the United Kingdom, the United States and the national Antarctic programme of Finland.

The data are related to the ionic composition of atmospheric aerosol continuously collected at Dome C. They refer to PM10 and size-segregated aerosol collected at 2-day and 4-day resolution, respectively. The measured chemical parameters include main and trace inorganic anions and cations and selected organic anions (methanesulphonic acid - MSA).

The MBES NZ-water dataset was collected during the XXXIX PNRA Italian Antarctic Expedition aboard R/V Laura Bassi in direct response to a request from New Zealand to acquire bathymetric data during transits within their waters. The acquisition of this valuable dataset was carried out by the ISOBatA Project team, utilizing a state-of-the-art multibeam EM304 system installed on the R/V Laura Bassi. The genesis of the MBES NZ-water dataset is deeply linked to the international collaborative effort aimed at mapping unexplored regions, exemplified by the Seabed 2030 Project. By aligning with New Zealand's research objectives, both the ISOBatA project and the Italian Antarctic Expedition epitomize their commitment to knowledge exchange and the advancement of scientific understanding on a global scale.

Commandant Charcot. Italian National Research Council - Institute of Polar Sciences data from a local source.

An updated compilation of published and new data of major-ion (Ca, Cl, K, Mg, Na, NO3, SO4) and methylsulfonate (MS) concentrations in snow from 520 Antarctic sites is provided by the national ITASE (International Trans-Antarctic Scientific Expedition) programmes of Australia, Brazil, China, Germany, Italy, Japan, Korea, New Zealand, Norway, the United Kingdom, the United States and the national Antarctic programme of Finland.

We present here the Multichannel Seismic metadata collected in 2022 by the PNRA19_00022 COLLAPS project "Cook glacier-Ocean system, sea LeveL and Antarctic Past Stability" Principal Investigator: L. De Santis OGS ldesantis@ogs.it The data set consist of ca. 300 km of multichannel seismic profiles collected with the R/V L. Bassi employing 2 x 210 cu.in. GI Gun and a 1500 m long digital streamer, 120 channels, intertrace of 12.5 m, shot interval 37.5 m (=circa 18.75 sec, ship speed 4 knots), record length 8 seconds. The data set was processed at OGS. The seismic trackline (and the segy stacked data) can be downloaded from the Antarctic Seismic Data Library System. The stacked seismic data are available after 4 years from the campaign. Keywords: Southern Ocean, Multichanenl Seismic, COLLAPS, Laura Bassi, Antarctica, SDLS.

We present here the final 100-meter cell size grid projection EPSG:9354 and metadata from the ISOBatA PNRA project, shared with the Alfred Wegener Institute (AWI) as part of the International Bathymetric Chart of the Southern Ocean (IBCSO). This dataset was collected by the ISOBatA project team using the Kongsberg EM304 multibeam system installed on the R/V Laura Bassi. The dataset processed and quality-controlled using QPS Qimera software and corrected for sound velocity using XBT and CTD data (courtesy of the MORSEA project), has been provided to AWI (IBCSO) and is archived here to ensure traceability, wide dissemination, and future usability. The PNRA-funded project ISOBatA (Italian Southern Ocean Bathymetry from consistent exploitation of opportunistic seafloor datasets in the Antarctic region and surrounding areas) introduced an innovative approach to optimize the collection of acoustic (mainly bathymetric) and magnetometric data. The primary objective of the project was to improve the bathymetric understanding of the Southern Ocean by collecting multibeam echosounder data during the Laura Bassi expeditions, focusing on previously unexplored areas in the Ross Sea and in the region between the Macquarie Triple Junction (MQ TJ) and the Emerald Fracture Zone (EMZ). The operational phase of ISOBatA spanned three expeditions: XXXVII (2021-2022), XXXVIII (2023), and XXXIX (2024) of the Laura Bassi in Antarctica. In the first two years (XXXVII and XXXVIII), the project benefited from dedicated ship time, which enabled efficient data collection through strategic speed reductions during transfers and route adjustments along pre-identified corridors. Data collection was planned based on pre-existing metadata, such as IBCSO coverage, the Seismic Data Library (SDL), Italian Mooring Sites, and Italian Coring and Box Coring Sites. This also included transit routes through the Southern Ocean along the MQ and EMZ, as well as unmapped areas in the Ross Sea, such as the Italian MORSEA Mooring Sites. In the third year (XXXIX), no dedicated ship time was available. Nevertheless, ISOBatA managed to collect data under two conditions: 1) without changing the ship's course or speed and 2) by simultaneously collecting acoustic data for other projects, which affected the spatial resolution of the data collected with EM304. Despite the challenges posed by rough seas, ice, ship speeds, and the lack of tide gauges, ISOBatA proved the feasibility of opportunistic acoustic data collection, particularly in the Ross Sea. This was achieved by utilizing downtime during mooring maintenance, support for supply vessels, medical evacuation (MEDEVAC), and sheltering during standby weather conditions. Onboard data sharing fostered valuable collaborations with other research teams, enhancing the overall scientific results. We acknowledge the MORSEA project for providing real-time of XBT and CTD data, which enabled the application of accurate sound velocity profiles. We also thank to the PNRA Program for funding and support, to ISOBatA project partners: OGS (PI D. Accettella, P. Diviacco), UniMIB (A. Savini), IGAG-CNR (M. Cuffaro), and INGV (F. Muccini), as well as the Laura Bassi research teams for their scientific contributions and collaborations. Keywords: Southern Ocean, Bathymetry, ISOBatA, Laura Bassi, Antarctica, IBCSO.

Calibrated (in unit of solar disk brightness) measurements of the sky brightness at DOME C as obtained by the ESCAPE experiment during the campaign 2022-2023

Here we present the snow pits collected along the international EAIIST project traverse, which took place in 2019-2020 Antarctic Campaign. We report the number of snow pits collected, the depth of the samplings and their geographic information.

Trophic interactions underlie coexistence mechanisms between species, define the functional role of specie within communities, affect biodiversity and bioaccumulation processes of heavy metal. Sea-ice dynamics, which at Terra Nova Bay is characterized by an extraordinary seasonality, drives interspecific interactions and the exchange of materials between ecosystem compartments. Indeed, the activation of the primary production after sea-ice break up opens alternative trophic pathways for consumers. The “next generation SRPs” represent a highly appropriate framework for the present project which follows the results obtained with the previous project ISOBIOTOX (PNRA 2013) and aims at (i) determine topological and functional metrics of sympagic and pelagic food webs at Terra Nova Bay under different conditions of sea-ice coverage along a distance gradient from the nearest open water polynya to areas were the seasonal sea-ice coverage persists longer; (ii) evaluate bioaccumulation and biomagnification of heavy metals in trophic sources at the base of the food web and in target species along food chains, including fishes of commercial interests and top predators, both in the presence and absence of sympagic and pelagic primary producers. High resolution food webs will be reconstructed by means of the simultaneous elemental and isotopic analysis of different elements (C and N) and the bioaccumulation of pollutants. The research program integrates complementary research approaches: (a) Elemental analysis coupled with mass spectrometry for stable isotope analysis (δ13C, δ15N) in animal and vegetal tissues and dead organic matter, (b)analyses of heavy metals accumulation (Chromatography) in the constituent species of the Antarctic food web.