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Naslov:Heating rate and energy gradient from the tropics to the North Pole
Avtorji:ID Ferrero, Luca (Avtor)
ID Rigler, Martin (Avtor)
ID Gregorič, Asta (Avtor)
ID Močnik, Griša (Avtor), et al.
Datoteke:.pdf EGU24-17118-print.pdf (291,43 KB)
MD5: 36A5AA5CF85713AC180D29FD18EDAB27
 
URL https://meetingorganizer.copernicus.org/EGU24/EGU24-17118.html
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.12 - Objavljeni povzetek znanstvenega prispevka na konferenci
Organizacija:UNG - Univerza v Novi Gorici
Opis:Absorbing aerosol species, such as Black (BC) and Brown (BrC) Carbon, are able to warm the atmosphere. The role of aerosols is one of the least clear aspects in the so called “Arctic Amplification” (AA) and up to now this was mostly modelled [1,2]. For this reason, we took part in four scientific cruises (AREX, Arctic-Expedition, summer 2018, 2019, 2021 and EUREC4A, 2020) in the North Atlantic, eastward and south-eastward of Barbados, aiming at the determination of the aerosol chemical composition and properties from the Tropics to the North Pole. The Heating Rate (HR) was experimentally determined at 1 minute time-resolution along different latitudes by means of an innovative methodology [3], obtained by cumulatively taking into account the aerosol optical properties, i.e. the absorption coefficients (measured by AE33 Aethalometer) and incident radiation (direct, diffuse and reflected) across the entire solar spectrum. The HR computed along AREX and in Milan (in the same period) were used to determine the energy gradient, due to the LAA induced heat storage at mid-latitudes, which contributes to AA through the atmospheric heat transport northward. Moreover, aerosol chemical composition was achieved by means of sampling via high volume sampler (ECHO-PUF Tecora) and analysis via ion chromatography, TCA08 for Total Carbon content, Aethalometer AE33 (for BC), ICP-OES for elements. A clear latitudinal behaviour in Black Carbon concentrations, with the highest values at low latitudes (e.g. average BC concentration in Gdansk up to 1507±75 ng/m3) and a progressive decrease moving northwards and away from the big Arctic settlements (Black Carbon concentrations within the 81st parallel: 5±1 ng/m3). According to the latitudinal behaviour of BC concentrations and solar radiation (decreases towards the north while the diffuse component increases), HR decreases noticeably towards the Arctic: e.g. higher in the harbor of Gdansk (0.290±0.010 K/day) followed by the Baltic Sea (0.04±0.01 K/day), the Norvegian Sea (0.010±0.010 K/day) and finally with the lowest values in the pure Arctic Ocean (0.003±0.001 K/day). Accordingly, the energy density added to the system by the aerosol, a positive forcing that differs by 2 orders of magnitude between mid-latitudes and North Pole was found: 347.3 ± 11.8 J/m3 (Milan), 244.8 ± 12.2 J/m3 (Gdansk) and 2.6 ± 0.2 J/m3 (80°N). These results highlight the presence of a great energy gradient between mid-latitudes and Arctic that can trigger a heat transport towards the Arctic. Moreover this was strengthen by the HR value for EUREC4A in Barbados that was 0.175±0.003 K/day. Finally, preliminary results from Antarctica collected onboard the Italian RV Laura Bassi cruising the Southern Ocean and the Ross Sea will be shown.     Acknoledgements: GEMMA Center, Project TECLA MIUR – Dipartimenti di Eccellenza 2023–2027. JPI EUREC4A-OA project. CAIAC (oCean Atmosphere Interactions in the Antarctic regions and Convergence latitude) PNRA project   References [1] Navarro, J. C. A. et al. (2016) Nat. Geosci. 9, 277–281. [2] Shindell, D. and Faluvegi, G. (2009) Nat. Geosci. 2, 294–300. [3] Ferrero, L. et al. (2018) Environ. Sci. Technol. 52, 3546 3555.
Ključne besede:blackcarbon, brown carbon, atmospheric heating rate, climate change
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Leto izida:2024
Št. strani:1 spletni vir
PID:20.500.12556/RUNG-8938 Novo okno
COBISS.SI-ID:189253635 Novo okno
UDK:502.3/.7
DOI:10.5194/egusphere-egu24-17118 Novo okno
NUK URN:URN:SI:UNG:REP:UUEKECK2
Datum objave v RUNG:18.03.2024
Število ogledov:398
Število prenosov:2
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Naslov:EGU General Assembly 2024 : Vienna, Austria & online, 14-19 April 2024
Kraj izida:Göttingen
Založnik:EGU - European Geosciences Union
Leto izida:2024
COBISS.SI-ID:189198083 Novo okno

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