Articles | Volume 19, issue 10
Research article
25 May 2022
Research article |  | 25 May 2022

Summer trends and drivers of sea surface fCO2 and pH changes observed in the southern Indian Ocean over the last two decades (1998–2019)

Coraline Leseurre, Claire Lo Monaco, Gilles Reverdin, Nicolas Metzl, Jonathan Fin, Claude Mignon, and Léa Benito

Data sets

Surface Ocean CO2 Atlas Database Version 2021 (SOCAT v2021) (NCEI Accession 0235360) Bakker, D. C. E., Alin, S. R., Casta\~{n}o-Primo, R., Cronin, M., Gkritzalis, T., Kozyr, A., Lauvset, S. K., Metzl, N., Munro, D. R., Nakaoka, S.-I., O'Brien, K. M., Olsen, A., Omar, A. M., Pfeil, B., Pierrot, D., Rodriguez, C., Steinhoff, T., Sutton, A. J., Tilbrook, B., Wanninkhof, R., Willstrand, A., Ahmed, M., Andersson, A., Apelthun, L. B., Bates, N., Battisti, R., Beaumont, L., Becker, M., Benoit-Cattin, A., Berghoff, C. F., Boutin, J., Burger, E. F., Burgers, T. M., Cantoni, C., Cattrijsse, A., Chierici, M., Cross, J. N., Coppola, L., Cosca, C. E., Currie, K. I., De Carlo, E. H., Else, B., Enright, M. P., Ericson, Y., Evans, W., Feely, R. A., Fiedler, B., Fransson, A., Garc\'{\i}a-Ib\'{a}\~{n}ez, M. I., Gehrung, M., Glockzin, M., Gonz\'{a}lez D\'{a}vila, M., Gutekunst, S., Hermes, R., Humphreys, M. P., Hunt, C. W., Ib\'{a}nhez, J. S. P., Jones, S. D., Kitidis, V., K\"{o}rtzinger, A., Kosugi, N., Landa, C. S., Landsch\"{u}tzer, P., Lef\`{e}vre, N., Lo Monaco, C., Luchetta, A., Lutz, V. A., Macovei, V., Manke, A. B., Merlivat, L., Millero, F. J., Monacci, N. M., Negri, R. M., Newberger, T., Newton, J., Nickford, S. E., Nojiri, Y., Ohman, M., \'{O}lafsd\'{o}ttir, S. R., Sweeney, C., Ono, T., Palter, J. B., Papakyriakou, T., Petersen, W. T., Plueddemann, A. J., Qi, D., Rehder, G., Ritschel, M., Rutgersson, A., Sabine, C. L., Salisbury, J. E., Santana-Casiano, J. M., Schlitzer, R., Send, U., Skjelvan, I., Smith, K., Sparnocchia, S., Sullivan, K. F., Sutherland, S. C., Szuts, Z., Tadokoro, K., Tanhua, T., Telszewski, M., Theetaert, H., Vandemark, D., Voynova, Y., Wada, C., Weller, R. A., and Woosley, R. J.

Surface AT and CT data (OISO lines) (NCEID/OCADS database) Metzl, N and Lo Monaco C.

Global Ocean Data Analysis Project version 2.2021 (GLODAPv2.2021) (NCEI Accession 0237935) Siv K. Lauvset, Nico Lange, Toste Tanhua, Henry C. Bittig, Are Olsen, Alex Kozyr, Marta Álvarez, Susan Becker, Peter J. Brown, Brendan R. Carter, Leticia Cotrim da Cunha, Richard A. Feely, Steven M. A. C. van Heuven, Mario Hoppema, Masao Ishii, Emil Jeansson, Sara Jutterström, Steve D. Jones, Maren K. Karlsen, Claire Lo Monaco, Patrick Michaelis, Akihiko Murata, Fiz F. Pérez, Benjamin Pfeil, Carsten Schirnick, Reiner Steinfeldt, Toru Suzuki, Bronte Tilbrook, Antón Velo, Rik Wanninkhof, Ryan J. Woosley, and Robert M. Key

Short summary
Decadal trends of fugacity of CO2 (fCO2), total alkalinity (AT), total carbon (CT) and pH in surface waters are investigated in different domains of the southern Indian Ocean (45°S–57°S) from ongoing and station observations regularly conducted in summer over the period 1998–2019. The fCO2 increase and pH decrease are mainly driven by anthropogenic CO2 estimated just below the summer mixed layer, as well as by a warming south of the polar front or in the fertilized waters near Kerguelen Island.
Final-revised paper