Mendoza-Lera, Clara; Pastor, Ada; Anna, Lupon; Catalan, Nuria; Datry, Thibault: Dissolved Organic Carbon concentration and properties in two constrasting pre-alpine streams [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996227 (dataset in review)
Abstract:
This study investigates the influence of hyporheic exchange on dissolved organic matter (DOM) dynamics in two contrasting 100-m stream reaches within the Isère catchment, French Alps Piedmont. One reach (Correncon, Disconnected) exhibited no significant hyporheic exchange due to semi-permeable silty sand sediment, while the other (La Fauge, Connected) had a relative connectivity of 0.49 ± 0.014, indicating active hyporheic flow through permeable clean sand. At 25 evenly spaced transects, hyporheic wells (1.6 cm PVC, 0.4 cm mesh, 25 cm depth) were installed and sampled over five days. A conservative tracer (NaCl) was added upstream to quantify hyporheic exchange via electrical conductivity (EC) dynamics. Surface and hyporheic water samples were collected at background and plateau conditions, with Dissolved Organic Carbon (DOC) measured via TOC analyzer and DOM composition assessed using excitation-emission matrices (EEMs). EEMs were corrected for instrument bias, inner filter effects, and calibrated to Raman Units. Spectroscopic metrics—fluorescence index (FI), biological index (BIX), and humification index (HIX)—were calculated to assess DOM source, age, and degree of humification. Data include EC time series, DOC concentrations, EEMs, and derived DOM metrics.
Supplement to:
Mendoza-Lera, Clara; Pastor, Ada; Anna, Lupon; Catalan, Nuria; Datry, Thibault (in prep.): Hyporheic Exchange modulates dissolved organic matter in the hyporheic zone in pre-alpine streams. Limnetica
References:
Argerich, Alba; Martí, Eugènia; Sabater, Francesc; Ribot, Miquel (2011): Temporal variation of hydrological exchange and hyporheic biogeochemistry in a headwater stream during autumn. Journal of the North American Benthological Society, 30(3), 635-652, https://doi.org/10.1899/10-078.1
Fellman, Jason B; Hood, Eran; Spencer, Robert G M (2010): Fluorescence spectroscopy opens new windows into dissolved organic matter dynamics in freshwater ecosystems: A review. Limnology and Oceanography, 55(6), 2452-2462, https://doi.org/10.4319/lo.2010.55.6.2452
Huguet, Arnaud; Vacher, L; Relexans, S; Saubusse, S; Froidefond, J M; Parlanti, E (2009): Properties of fluorescent dissolved organic matter in the Gironde Estuary. Organic Geochemistry, 40(6), 706-719, https://doi.org/10.1016/j.orggeochem.2009.03.002
Jaffé, Rudolf; McKnight, D; Maie, Nagamitsu; Cory, R; McDowell, William H; Campbell, J L (2008): Spatial and temporal variations in DOM composition in ecosystems: The importance of long‐term monitoring of optical properties. Journal of Geophysical Research, 113(G4), 2008JG000683, https://doi.org/10.1029/2008JG000683
Mendoza-Lera, Clara; Ribot, Miquel; Foulquier, Arnaud; Martí, Eugènia; Bonnineau, Chloé; Breil, Pascal; Datry, Thibault (2019): Exploring the role of hydraulic conductivity on the contribution of the hyporheic zone to in‐stream nitrogen uptake. Ecohydrology, 12(7), e2139, https://doi.org/10.1002/eco.2139
Coverage:
Median Latitude: 45.052517 * Median Longitude: 5.560675 * South-bound Latitude: 45.048450 * West-bound Longitude: 5.543600 * North-bound Latitude: 45.056583 * East-bound Longitude: 5.577750
Date/Time Start: 2016-06-20T00:00:00 * Date/Time End: 2016-07-11T00:00:00
Minimum Elevation: 1018.0 m * Maximum Elevation: 1232.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Type of study | Study type | Mendoza-Lera, Clara | |||
| 2 | Stream, flow type | Stream, flow type | Mendoza-Lera, Clara | According to Mendoza-Lera et al. (2019) | ||
| 3 | Compartment | Compartment | Mendoza-Lera, Clara | According to Mendoza-Lera et al. (2019) | ||
| 4 | Carbon, organic, dissolved | DOC | mg/l | Mendoza-Lera, Clara | Total organic carbon analyzer (TOC), Shimadzu, TOC-VPCH | |
| 5 | Fluorescence index | FI | Mendoza-Lera, Clara | According to Jaffé et al. (2008) | ||
| 6 | Biological index | BIX | Mendoza-Lera, Clara | According to Huguet et al. (2009) | ||
| 7 | Humification index | HIX | Mendoza-Lera, Clara | According to Fellman et al. (2010) | ||
| 8 | Hyporheic exchange, relative connectivity | Hyporheic exchange RC | Mendoza-Lera, Clara | see comment | According to Argerich et al. (2011, doi:10.1899/10-078.1) and Mendoza-Lera et al. (2019, doi:10.1002/eco.2139). |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
393 data points