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Challenges of predicting gas transfer velocity from wind measurements over global lakes

Klaus, Marcus and Vachon, Dominic (2020). Challenges of predicting gas transfer velocity from wind measurements over global lakes. Aquatic Sciences - Research Across Boundaries. 82 , 53 , 1-17
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Abstract

Estimating air-water gas transfer velocities (k) is integral to understand biogeochemical and ecological processes in aquatic systems. In lakes, k is commonly predicted using wind-based empirical models, however, their predictive performance under conditions that differ from their original calibration remains largely unassessed. Here, we collected 2222 published k estimates derived from various methods in 46 globally distributed lakes to (1) evaluate the predictions of a selection of six available wind-speed based k models for lakes and (2) explore and develop new empirical models to predict k over global lakes. We found that selected k models generally performed poorly in predicting k in lakes. Model predictions were more accurate than simply assuming a mean k in only 2-39% of all lakes, however, we could not identify with confidence the specific conditions in which some models outperformed others. We developed new wind-based models in which additional variables describing the spatial coverage of k estimates and the lake size and shape had a significant effect on the wind speed-k relationship. Although these new models did not fit the global dataset significantly better than previous k models, they generate overall less biased predictions for global lakes. We further provide explicit estimates of prediction errors that integrate methodological and lake-specific uncertainties. Our results highlight the potential limits when using wind-based models to predict k across lakes and urge scientists to properly account for prediction errors, or measure k directly in the field whenever possible.

Authors/Creators:Klaus, Marcus and Vachon, Dominic
Title:Challenges of predicting gas transfer velocity from wind measurements over global lakes
Year of publishing :2020
Volume:82
Article number:53
Number of Pages:17
Publisher:Springer Nature
ISSN:1015-1621
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
Keywords:Air-water gas exchange, Model assessment, Lake gas flux, Wind speed, k(600), Reaeration
URN:NBN:urn:nbn:se:slu:epsilon-p-105608
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105608
Additional ID:
Type of IDID
DOI10.1007/s00027-020-00729-9
Web of Science (WoS)000529754800001
ID Code:17087
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:09 Jun 2020 06:28
Metadata Last Modified:09 Jun 2020 06:28

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