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High-frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation

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High-frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation. / Blaen, Phillip J.; Khamis, Kieran; Lloyd, Charlotte; Comer-Warner, Sophie; Ciocca, Francesco; Thomas, Rick M.; MacKenzie, A. Rob; Krause, Stefan.

In: Journal of Geophysical Research: Biogeosciences, Vol. 122, No. 9, 2017, p. 2265-2281.

Research output: Contribution to journalArticle

Harvard

Blaen, PJ, Khamis, K, Lloyd, C, Comer-Warner, S, Ciocca, F, Thomas, RM, MacKenzie, AR & Krause, S 2017, 'High-frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation', Journal of Geophysical Research: Biogeosciences, vol. 122, no. 9, pp. 2265-2281. https://doi.org/10.1002/2017JG003904

APA

Blaen, P. J., Khamis, K., Lloyd, C., Comer-Warner, S., Ciocca, F., Thomas, R. M., ... Krause, S. (2017). High-frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation. Journal of Geophysical Research: Biogeosciences, 122(9), 2265-2281. https://doi.org/10.1002/2017JG003904

Vancouver

Blaen PJ, Khamis K, Lloyd C, Comer-Warner S, Ciocca F, Thomas RM et al. High-frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation. Journal of Geophysical Research: Biogeosciences. 2017;122(9):2265-2281. https://doi.org/10.1002/2017JG003904

Author

Blaen, Phillip J. ; Khamis, Kieran ; Lloyd, Charlotte ; Comer-Warner, Sophie ; Ciocca, Francesco ; Thomas, Rick M. ; MacKenzie, A. Rob ; Krause, Stefan. / High-frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation. In: Journal of Geophysical Research: Biogeosciences. 2017 ; Vol. 122, No. 9. pp. 2265-2281.

Bibtex

@article{1fac6b74cdbb44eab1b06abb3030c111,
title = "High-frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation",
abstract = "Storm events can drive highly variable behavior in catchment nutrient and water fluxes, yet short-term event dynamics are frequently missed by low-resolution sampling regimes. In addition, nutrient source zone contributions can vary significantly within and between storm events. Our inability to identify and characterize time-dynamic source zone contributions severely hampers the adequate design of land use management practices in order to control nutrient exports from agricultural landscapes. Here we utilize an 8 month high-frequency (hourly) time series of streamflow, nitrate (NO3-N), dissolved organic carbon (DOC), and hydroclimatic variables for a headwater agricultural catchment. We identified 29 distinct storm events across the monitoring period. These events represented 31{\%} of the time series and contributed disproportionately to nutrient loads (42{\%} of NO3-N and 43{\%} of DOC) relative to their duration. Regression analysis identified a small subset of hydroclimatological variables (notably precipitation intensity and antecedent conditions) as key drivers of nutrient dynamics during storm events. Hysteresis analysis of nutrient concentration-discharge relationships highlighted the dynamic activation of discrete NO3-N and DOC source zones, which varied on an event-specific basis. Our results highlight the benefits of high-frequency in situ monitoring for characterizing short-term nutrient fluxes and unraveling connections between hydroclimatological variability and river nutrient export and source zone activation under extreme flow conditions. These new process-based insights, which we summarize in a conceptual model, are fundamental to underpinning targeted management measures to reduce nutrient loading of surface waters.",
keywords = "Nutrients and nutrient cycling, Water quality, Extreme events, Hydroclimatology, Monitoring networks, sensor, in situ, NO3, DOC, river, hysteresis",
author = "Blaen, {Phillip J.} and Kieran Khamis and Charlotte Lloyd and Sophie Comer-Warner and Francesco Ciocca and Thomas, {Rick M.} and MacKenzie, {A. Rob} and Stefan Krause",
note = "2017JG003904",
year = "2017",
doi = "10.1002/2017JG003904",
language = "English",
volume = "122",
pages = "2265--2281",
journal = "Journal of Geophysical Research: Biogeosciences",
issn = "2169-8953",
publisher = "American Geophysical Union",
number = "9",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - High-frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation

AU - Blaen, Phillip J.

AU - Khamis, Kieran

AU - Lloyd, Charlotte

AU - Comer-Warner, Sophie

AU - Ciocca, Francesco

AU - Thomas, Rick M.

AU - MacKenzie, A. Rob

AU - Krause, Stefan

N1 - 2017JG003904

PY - 2017

Y1 - 2017

N2 - Storm events can drive highly variable behavior in catchment nutrient and water fluxes, yet short-term event dynamics are frequently missed by low-resolution sampling regimes. In addition, nutrient source zone contributions can vary significantly within and between storm events. Our inability to identify and characterize time-dynamic source zone contributions severely hampers the adequate design of land use management practices in order to control nutrient exports from agricultural landscapes. Here we utilize an 8 month high-frequency (hourly) time series of streamflow, nitrate (NO3-N), dissolved organic carbon (DOC), and hydroclimatic variables for a headwater agricultural catchment. We identified 29 distinct storm events across the monitoring period. These events represented 31% of the time series and contributed disproportionately to nutrient loads (42% of NO3-N and 43% of DOC) relative to their duration. Regression analysis identified a small subset of hydroclimatological variables (notably precipitation intensity and antecedent conditions) as key drivers of nutrient dynamics during storm events. Hysteresis analysis of nutrient concentration-discharge relationships highlighted the dynamic activation of discrete NO3-N and DOC source zones, which varied on an event-specific basis. Our results highlight the benefits of high-frequency in situ monitoring for characterizing short-term nutrient fluxes and unraveling connections between hydroclimatological variability and river nutrient export and source zone activation under extreme flow conditions. These new process-based insights, which we summarize in a conceptual model, are fundamental to underpinning targeted management measures to reduce nutrient loading of surface waters.

AB - Storm events can drive highly variable behavior in catchment nutrient and water fluxes, yet short-term event dynamics are frequently missed by low-resolution sampling regimes. In addition, nutrient source zone contributions can vary significantly within and between storm events. Our inability to identify and characterize time-dynamic source zone contributions severely hampers the adequate design of land use management practices in order to control nutrient exports from agricultural landscapes. Here we utilize an 8 month high-frequency (hourly) time series of streamflow, nitrate (NO3-N), dissolved organic carbon (DOC), and hydroclimatic variables for a headwater agricultural catchment. We identified 29 distinct storm events across the monitoring period. These events represented 31% of the time series and contributed disproportionately to nutrient loads (42% of NO3-N and 43% of DOC) relative to their duration. Regression analysis identified a small subset of hydroclimatological variables (notably precipitation intensity and antecedent conditions) as key drivers of nutrient dynamics during storm events. Hysteresis analysis of nutrient concentration-discharge relationships highlighted the dynamic activation of discrete NO3-N and DOC source zones, which varied on an event-specific basis. Our results highlight the benefits of high-frequency in situ monitoring for characterizing short-term nutrient fluxes and unraveling connections between hydroclimatological variability and river nutrient export and source zone activation under extreme flow conditions. These new process-based insights, which we summarize in a conceptual model, are fundamental to underpinning targeted management measures to reduce nutrient loading of surface waters.

KW - Nutrients and nutrient cycling, Water quality, Extreme events, Hydroclimatology, Monitoring networks, sensor, in situ, NO3, DOC, river, hysteresis

U2 - 10.1002/2017JG003904

DO - 10.1002/2017JG003904

M3 - Article

VL - 122

SP - 2265

EP - 2281

JO - Journal of Geophysical Research: Biogeosciences

JF - Journal of Geophysical Research: Biogeosciences

SN - 2169-8953

IS - 9

ER -