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Title: Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem

Abstract

Semiarid ecosystems play a critical role in determining the interannual variability of the global terrestrial carbon sink. Water availability is a critical driver of productivity in semiarid ecosystems, which often alternate between carbon sink/source functioning during wet/dry years. In this study, we investigate how groundwater availability resulting from groundwater-river water exchange influences net ecosystem exchange of CO2 (NEE), evapotranspiration (ET), and the surface energy balance at two semiarid ecosystems along the Columbia River in central Washington, USA. We examined 1 year of eddy covariance measurements from an upland sagebrush ecosystem primarily fed by rainfall without groundwater access and a riparian grassland ecosystem with groundwater access during the dry season due to lateral groundwater-river water exchange. The two sites had distinct seasonal patterns of NEE and ET, driven by differences in water availability. While NEE at the upland sagebrush site was strongly constrained by water availability during the dry months, access to groundwater allowed the riparian site to maintain high NEE magnitude and ET during the same dry months. The riparian site had larger annual gross primary productivity than the upland site (612 vs. 424 gC/m2), which was offset by higher ecosystem respiration (558 vs. 363 gC/m2). Thus, the magnitude ofmore » the annual NEE at the upland site was larger than that at the riparian site (-62 vs. -54 gC/m2). Furthermore, our results demonstrate that groundwater access determined by connectivity between groundwater and surface water can be a critical driver of carbon uptake and ET in semiarid ecosystems.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [2];  [2];  [2]; ORCiD logo [2]
  1. Washington State Univ., Pullman, WA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1502404
Alternate Identifier(s):
OSTI ID: 1490760
Report Number(s):
PNNL-SA-142097
Journal ID: ISSN 2169-8953
Grant/Contract Number:  
AC05-76RL01830; 54737
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 124; Journal Issue: 1; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; eddy covariance; semi‐arid ecosystems; groundwater; carbon dioxide fluxes; evapotranspiration

Citation Formats

Missik, Justine E. C., Liu, Heping, Gao, Zhongming, Huang, Maoyi, Chen, Xingyuan, Arntzen, Evan, Mcfarland, Douglas P., Ren, Huiying, Titzler, P. Scott, Thomle, Jonathan N., and Goldman, Amy. Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem. United States: N. p., 2018. Web. doi:10.1029/2018JG004666.
Missik, Justine E. C., Liu, Heping, Gao, Zhongming, Huang, Maoyi, Chen, Xingyuan, Arntzen, Evan, Mcfarland, Douglas P., Ren, Huiying, Titzler, P. Scott, Thomle, Jonathan N., & Goldman, Amy. Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem. United States. doi:10.1029/2018JG004666.
Missik, Justine E. C., Liu, Heping, Gao, Zhongming, Huang, Maoyi, Chen, Xingyuan, Arntzen, Evan, Mcfarland, Douglas P., Ren, Huiying, Titzler, P. Scott, Thomle, Jonathan N., and Goldman, Amy. Thu . "Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem". United States. doi:10.1029/2018JG004666. https://www.osti.gov/servlets/purl/1502404.
@article{osti_1502404,
title = {Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem},
author = {Missik, Justine E. C. and Liu, Heping and Gao, Zhongming and Huang, Maoyi and Chen, Xingyuan and Arntzen, Evan and Mcfarland, Douglas P. and Ren, Huiying and Titzler, P. Scott and Thomle, Jonathan N. and Goldman, Amy},
abstractNote = {Semiarid ecosystems play a critical role in determining the interannual variability of the global terrestrial carbon sink. Water availability is a critical driver of productivity in semiarid ecosystems, which often alternate between carbon sink/source functioning during wet/dry years. In this study, we investigate how groundwater availability resulting from groundwater-river water exchange influences net ecosystem exchange of CO2 (NEE), evapotranspiration (ET), and the surface energy balance at two semiarid ecosystems along the Columbia River in central Washington, USA. We examined 1 year of eddy covariance measurements from an upland sagebrush ecosystem primarily fed by rainfall without groundwater access and a riparian grassland ecosystem with groundwater access during the dry season due to lateral groundwater-river water exchange. The two sites had distinct seasonal patterns of NEE and ET, driven by differences in water availability. While NEE at the upland sagebrush site was strongly constrained by water availability during the dry months, access to groundwater allowed the riparian site to maintain high NEE magnitude and ET during the same dry months. The riparian site had larger annual gross primary productivity than the upland site (612 vs. 424 gC/m2), which was offset by higher ecosystem respiration (558 vs. 363 gC/m2). Thus, the magnitude of the annual NEE at the upland site was larger than that at the riparian site (-62 vs. -54 gC/m2). Furthermore, our results demonstrate that groundwater access determined by connectivity between groundwater and surface water can be a critical driver of carbon uptake and ET in semiarid ecosystems.},
doi = {10.1029/2018JG004666},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 1,
volume = 124,
place = {United States},
year = {2018},
month = {12}
}

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    Works referencing / citing this record:

    Mechanistic links between underestimated CO 2 fluxes and non-closure of the surface energy balance in a semi-arid sagebrush ecosystem
    journal, April 2019

    • Gao, Zhongming; Liu, Heping; Missik, Justine E. C.
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