@article{ardon_clark_marzolf_ramirez_pringle_2023, title={Can we see the nitrate from the trees? Long-term linkages between tropical forest productivity and stream nitrogen concentrations}, volume={2}, ISSN={["1573-515X"]}, DOI={10.1007/s10533-023-01030-1}, journal={BIOGEOCHEMISTRY}, author={Ardon, Marcelo and Clark, Deborah A. and Marzolf, Nicholas S. and Ramirez, Alonso and Pringle, Catherine M.}, year={2023}, month={Feb} }
 @article{marzolf_baca_bruce_vega-gomez_watson_ganong_ramirez_pringle_ardon_2022, title={Do experimental pH increases alter the structure and function of a lowland tropical stream?}, volume={13}, ISSN={["2150-8925"]}, url={https://doi.org/10.1002/ecs2.4097}, DOI={10.1002/ecs2.4097}, abstractNote={Abstract}, number={7}, journal={ECOSPHERE}, publisher={Wiley}, author={Marzolf, Nicholas S. and Baca, Dominic M. and Bruce, Terrius K. and Vega-Gomez, Mariely and Watson, Christopher D. and Ganong, Carissa N. and Ramirez, Alonso and Pringle, Catherine M. and Ardon, Marcelo}, year={2022}, month={Jul} }
 @article{marzolf_small_oviedo-vargas_ganong_duff_ramirez_pringle_genereux_ardon_2022, title={Partitioning inorganic carbon fluxes from paired O-2-CO2 gas measurements in a Neotropical headwater stream, Costa Rica}, volume={7}, ISSN={["1573-515X"]}, url={https://doi.org/10.1007/s10533-022-00954-4}, DOI={10.1007/s10533-022-00954-4}, abstractNote={The role of streams and rivers in the global carbon (C) cycle remains unconstrained, especially in headwater streams where CO2 evasion (FCO2) to the atmosphere is high. Stream C cycling is understudied in the tropics compared to temperate streams, and tropical streams may have among the highest FCO2 due to higher temperatures, continuous organic matter inputs, and high respiration rates both in-stream and in surrounding soils. In this paper, we present paired in-stream O2 and CO2 sensor data from a headwater stream in a lowland rainforest in Costa Rica to explore temporal variability in gas concentrations and ecosystem processes. Further, we estimate groundwater CO2 inputs (GWCO2) from riparian well CO2 measurements. Paired O2–CO2 data reveal stream CO2 supersaturation driven by groundwater CO2 inputs and large in-stream production of CO2. At short time scales, CO2 was diluted during storm events, but increased at longer seasonal scales. Areal fluxes in our study reach show that FCO2 is supported by greater in-stream metabolism compared to GWCO2. Our results underscore the importance of tropical headwater streams as large contributors of carbon dioxide to the atmosphere and show evaded C can be derived from both in-stream and terrestrial sources.}, journal={BIOGEOCHEMISTRY}, publisher={Springer Science and Business Media LLC}, author={Marzolf, Nicholas S. and Small, Gaston E. and Oviedo-Vargas, Diana and Ganong, Carissa N. and Duff, John H. and Ramirez, Alonso and Pringle, Catherine M. and Genereux, David P. and Ardon, Marcelo}, year={2022}, month={Jul} }
 @misc{marzolf_ardon_2021, title={Ecosystem metabolism in tropical streams and rivers: a review and synthesis}, volume={66}, ISSN={["1939-5590"]}, DOI={10.1002/lno.11707}, abstractNote={Abstract}, number={5}, journal={LIMNOLOGY AND OCEANOGRAPHY}, author={Marzolf, Nicholas S. and Ardon, Marcelo}, year={2021}, month={May}, pages={1627–1638} }
 @article{gomez-gener_rocher-ros_battin_cohen_dalmagro_dinsmore_drake_duvert_enrich-prast_horgby_et al._2021, title={Global carbon dioxide efflux from rivers enhanced by high nocturnal emissions}, volume={14}, ISSN={["1752-0908"]}, DOI={10.1038/s41561-021-00722-3}, abstractNote={Carbon dioxide (CO2) emissions to the atmosphere from running waters are estimated to be four times greater than the total carbon (C) flux to the oceans. However, these fluxes remain poorly constrained because of substantial spatial and temporal variability in dissolved CO2 concentrations. Using a global compilation of high-frequency CO2 measurements, we demonstrate that nocturnal CO2 emissions are on average 27% (0.9 gC m−2 d−1) greater than those estimated from diurnal concentrations alone. Constraints on light availability due to canopy shading or water colour are the principal controls on observed diel (24 hour) variation, suggesting this nocturnal increase arises from daytime fixation of CO2 by photosynthesis. Because current global estimates of CO2 emissions to the atmosphere from running waters (0.65–1.8 PgC yr−1) rely primarily on discrete measurements of dissolved CO2 obtained during the day, they substantially underestimate the magnitude of this flux. Accounting for night-time CO2 emissions may elevate global estimates from running waters to the atmosphere by 0.20–0.55 PgC yr−1. Failing to account for emission differences between day and night will lead to an underestimate of global CO2 emissions from rivers by up to 0.55 PgC yr–1, according to analyses of high-frequency CO2 measurements.}, number={5}, journal={NATURE GEOSCIENCE}, author={Gomez-Gener, Lluis and Rocher-Ros, Gerard and Battin, Tom and Cohen, Matthew J. and Dalmagro, Higo J. and Dinsmore, Kerry J. and Drake, Travis W. and Duvert, Clement and Enrich-Prast, Alex and Horgby, Asa and et al.}, year={2021}, month={May}, pages={289-+} }