Freezing-induced acidification of sea ice brine
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985904%3A_____%2F24%3A00587907" target="_blank" >RIV/67985904:_____/24:00587907 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/24:00137406
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0048969724043420?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0048969724043420?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.scitotenv.2024.174194" target="_blank" >10.1016/j.scitotenv.2024.174194</a>
Alternative languages
Result language
angličtina
Original language name
Freezing-induced acidification of sea ice brine
Original language description
The acidity of sea ice and snow plays a key role in the chemistry of the cryosphere, an important example lies in the photochemical catalytic release of reactive bromine in polar regions, facilitated at pHs below 6.5. We apply in-situ acid-base indicators to probe the microscopic acidity of the brine within the ice matrix in artificial sea water at a range of concentrations (0.35-70 PPT) and initial pHs (6-9). The results are supported by analogous measurements of the most abundant salts in seawater: NaCl, Na2SO4, and CaCO3. In the research herein, the acidity is expressed in terms of the Hammett acidity function, H2- . The obtained results show a pronounced acidity increase in sea water after freezing at -15 degrees C and during the subsequent cooling down to -50 degrees C. Importantly, we did not observe any significant hysteresis, the values of acidity upon warming markedly resembled those at the corresponding temperatures at cooling. The acidity increase is attributed to the minerals' crystallization, which is accompanied by a loss of the buffering capacity. Our observations show that lower salinity sea water samples (<= 3.5 PPT) reach pH values below 6.5 at the temperature of -15 degrees C, whereas higher salinity ices attain such values only at -30 degrees C. The ensuing implications for polar chemistry and the relevance to the field measurements are discussed.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10613 - Zoology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Science of the Total Environment
ISSN
0048-9697
e-ISSN
1879-1026
Volume of the periodical
946
Issue of the periodical within the volume
OCT 10
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
14
Pages from-to
174194
UT code for WoS article
001266508700001
EID of the result in the Scopus database
2-s2.0-85196803827