DOI: 10.5281/zenodo.17728138
title: Controls of sea–air O2 and CO2 exchanges along the Patagonian shelf-break: the role of temperature and phytoplankton communities

description: This dataset presents surface oceanographic measurements collected from 2004 to 2009 along the Patagonian Shelf (35°–55°S) as part of the Patagonian Experiment (PATEX) conducted by the High Latitude Oceanography Group (GOAL-Universidade Federal do Rio Grande FURG). The measurements include hydrographic variables (i.e., temperature, salinity, conductivity, pressure), dissolved oxygen concentration, chlorophyll-a (Chl-a), surface wind speed, and the partial pressure of CO2 in both seawater (pCO2sw) and the atmosphere (pCO2air). Derived variables include density, dissolved oxygen saturation, air-sea CO2 gradient (delta_pCO2), modeled fCO2, air–sea O2 and CO2 fluxes derived from multiple gas-exchange parameterizations (Woolf 1997, Woolf 1991, Wanninkhof 1992, Wanninkhof 2014, Liang et al.), non-thermal and thermal components of O2 fluxes.

In addition to the physicochemical variables, the dataset provides a characterization of the phytoplankton community, classified by pigment composition via high-performance liquid chromatography (HPLC; following Zapata et al.2000) and by microscopic counts, including abundance and biovolume of major functional groups (diatoms, dinoflagellates, cyanobacteria, cryptophytes, green flagellates, and haptophytes), as well as total chlorophyll-a and total biovolume estimates. The dataset supports investigations of air–sea gas exchange, carbon and oxygen cycles, primary productivity, and the ecological dynamics of phytoplankton in Southwestern Atlantic, contributing to ongoing efforts to quantify the role of coastal and shelf systems in regional and global climate-relevant processes.

References:

Liang, J.-H.;, Deutsch, C ;, Mcwilliams, J.C.;, Baschek, B ;, Sullivan, P.P.;, Chiba, D, Liang, J.-H., Deutsch, Curtis, Mcwilliams, James C, Baschek, Burkard, Sullivan, Peter P, Chiba, David, Liang, C.:, Deutsch, C, Mcwilliams, J C, Baschek, B, Sullivan, P P, 2013. Parameterizing bubble-mediated air-sea gas exchange and its effect on ocean ventilation. Global Biogeochem. Cycles 27, 894–905. https://doi.org/10.1002/GBC.20080

Wanninkhof, R., 2014. Relationship between wind speed and gas exchange over the ocean revisited. Limnol. Oceanogr. Methods 12, 351–362. https://doi.org/10.4319/lom.2014.12.351

Wanninkhof, R., 1992. Relationship between wind speed and gas exchange over the ocean. J. Geophys. Res. Ocean. 97, 7373–7382. https://doi.org/10.1029/92JC00188

Woolf, D.K., 1997. Bubbles and their role in gas exchange. Sea Surf. Glob. Chang. 173–206. https://doi.org/10.1017/CBO9780511525025.007

Woolf, D.K., Thorpe, S.A., 1991. Bubbles and the air-sea exchange of gases in near-saturation conditions. J. Mar. Res. 49, 435–466. https://doi.org/10.1357/002224091784995765

Zapata, M., Rodríguez, F., Garrido, J.L., 2000. Separation of chlorophylls and carotenoids from marine phytoplankton: a new HPLC method using a reversed phase C8 column and pyridine-containing mobile phases. Marine Ecology Progress Series 195, 29–45. https://doi.org/10.3354/MEPS195029

 

More information: luisa.moraes1998@hotmail.com or rodrigokerr@furg.br