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Data Descriptor

Reconstructed River Water Temperature Dataset for Western Canada 1980–2018

by
Rajesh R. Shrestha
* and
Jennifer C. Pesklevits
Watershed Hydrology and Ecology Research Division, Environment and Climate Change Canada, University of Victoria, 2472 Arbutus Rd., Victoria, BC V8N 1V8, Canada
*
Author to whom correspondence should be addressed.
Submission received: 2 February 2023 / Revised: 24 February 2023 / Accepted: 24 February 2023 / Published: 26 February 2023
(This article belongs to the Collection Modern Geophysical and Climate Data Analysis: Tools and Methods)

Abstract

:
Continuous water temperature data are important for understanding historical variability and trends of river thermal regime, as well as impacts of warming climate on aquatic ecosystem health. We describe a reconstructed daily water temperature dataset that supplements sparse historical observations for 55 river stations across western Canada. We employed the air2stream model for reconstructing water temperature dataset over the period 1980–2018, with air temperature and discharge data used as model inputs. The model was calibrated and validated by comparing with observed water temperature records, and the results indicate a reasonable statistical performance. We also present historical trends over the ice-free summer months from June to September using the reconstructed dataset, which indicate- significantly increasing water temperature trends for most stations. Besides trend analysis, the dataset could be used for various applications, such as calculation of heat fluxes, calibration/validation of process-based water temperature models, establishment of baseline condition for future climate projections, and assessment of impacts on ecosystems health and water quality.
Dataset License: Open Government License–Canada: https://open.canada.ca/en/open-government-licence-canada (accessed on 25 February 2023)

1. Summary

We describe a reconstructed daily river water temperature (°C) dataset for 55 stations across western Canada. The dataset was reconstructed using the semi-empirical air2stream model with inputs primarily consisting of extracted air temperature from ~10 km resolution 1980–2018 Regional Deterministic Reforecast System version 2.1, and streamflow data from the Water Survey of Canada hydrometric station network. Air2stream was calibrated/validated with observed water temperature records from various sources and the model provided a reasonable statistical performance. The dataset is designed to supplement sparse observation-based data, which is usually based on a few spot measurements in a year. The dataset could be used for various applications, such as analysis of trend, calculation of heat fluxes, calibration/validation of process-based water temperature models, establishment of baseline condition for future climate projections, analysis of climatic and basin drivers, and assessment of impacts on ecosystems health and water quality. An example application of the dataset, in terms of monthly trend analysis over open-water summer months, is provided.

2. Data Description

The dataset consists of reconstructed river water temperature values (°C) at a daily time step using the air2stream model [1] for 55 stations across western Canada (Figure 1). The dataset for all stations is provided in a single file in comma-separated-format (csv) spanning the period from 1 January 1980 to 31 December 2018 through the Government of Canada data portal. The water temperature station locations (Table A1) correspond to the Water Survey of Canada hydrometric stations (https://wateroffice.ec.gc.ca/ (accessed on 23 February 2023)) and a separate text file provides the station coordinates. Since air2stream simulation requires observed discharge data as an input, the days with no observed discharge data are specified as not available (NA) in the simulated water temperature dataset. Statistical performance of the simulated water temperature compared to observations are summarized in Table A2.
We also provide 1980–2018 trends over the ice-free summer months of June-September using the reconstructed water temperature data. The trend results are depicted spatially in maps (Figure A1) and summarized in Table A3. The results indicate significantly increasing water temperature trends for most months. Additionally, while most stations in the southern region indicate significant trends for all months, most northern stations show significant trends only for the month of June.

3. Methods

We selected 55 stations across western Canada based on the criteria of at least 50 water temperature observations and drainage basin area >1000 km2. Additional criteria included continuous streamflow observations and unregulated or relatively minor level of river flow regulation, e.g., Mackenzie and Fraser river stations.
We used the semi-empirical air2stream model [1] to reconstruct the daily water temperature dataset. The model uses simplified process-based equations to simulate river water temperature, with air temperature as the only meteorological forcing and the surface and sub-surface flow contributions considered in terms of lumped discharge. Daily air temperature inputs were extracted from ~10 km resolution Regional Deterministic Reforecast System, version 2.1 (RSRS_v2.1) reanalysis [2], except the high resolution (500 m) NRCanMet_500 data [3] for the Similkameen River near Headley and Nighthawk stations. Discharge inputs consisted of daily streamflow data from the Water Survey of Canada (WSC) hydrometric stations (https://wateroffice.ec.gc.ca/ (accessed on 23 February 2023)) that are nearest to the water temperature stations, except for the USGS streamflow data for the Yukon River at Eagle station AK (https://waterdata.usgs.gov/nwis/ (accessed on 23 February 2023)). We infilled missing observed discharge data with the hydrologic model simulated data for the available stations in the Liard [4] and Similkameen [5] watersheds. For all other stations, we infilled missing discharge values with averages before and after the missing period, and water temperature values for the missing discharge periods were specified as NA values in the uploaded dataset. We obtained observed water temperature records from a number of sources for calibrating/validating air2stream, as summarized in Shrestha and Pesklevits [6].
The air2stream model consists of 3 to 8 parameters (except 6 parameters) depending on the form of equation used. In this study, we calibrated air2stream models for all parameter combinations by using the particle swarm stochastic optimization procedure [1]. The model calibration was performed by comparing the simulated water temperature with observations for either the years 2010–2018 or 2000–2009, with the years with larger (smaller) number of observed water temperature records used for calibration (validation). We selected the best performing model parameter set by using the Nash–Sutcliffe coefficient of efficiency (NSE) as the performance criterion, supplemented by the mean absolute error (MAE), Kling–Gupta coefficient (KGE) and ratio of root mean square error to standard deviation of observation (RSR) as additional criteria. Higher NSE and KGE values (approaching 1) indicate better model performance, and lower MAE and RSR (approaching 0) indicate better model performance. We used the selected best performing models to simulate water temperature over the period of 1980–2018, and the model’s statistical performance over the period is summarized in Table A2. The results indicate good model performance in terms of NSE (minimum = 0.79, median = 0.93, maximum = 0.97), KGE (0.81, 0.94, 0.99), MAE (0.51, 0.99, 1.61 °C) and RSR (0.16, 0.27, 0.46) goodness-of-fit metrics.
We used the reconstructed water temperature dataset to calculate trends over the years 1980–2018 by employing the non-parametric Thiel–Sen method. Trend significance was determined by using the Mann–Kendall test with the effects of serial correlation removed by using the iterative pre-whitening method [7], as implemented in the R “zyp” package [8]. Two significance levels of p ≤ 0.05 and p ≤ 0.10 were used to consider statistically significant trends.
It is to be noted that the dataset presented is partially based on our previous study [6]. However, this dataset uses an expanded domain with a larger number of stations (55 vs. 18 in the previous study). Additionally, while two studies employed the same input data (RDRS_v2.1) for model calibration and validation, this study uses air temperature extracted from RDRS_v2.1 over the period of 1980–2018 compared to the 1945–2012 air temperature from the Pacific Northwest North-American meteorological (PNWNAmet) dataset [9] in the previous study. Hence, the presented water temperature data and trend analysis results are not expected to match with the previous study. In addition, note that the model reconstructed water temperature is affected by a number of sources of uncertainties arising out of data and model limitations, especially the sparsity of observation data and the lack of representation of physical processes and physiographic controls in the model. Readers are referred to our previous study [6] for a detailed discussion on uncertainties.

4. User Notes

The reconstructed water temperature dataset is designed to supplement sparse observation-based dataset, which is usually based on few spot measurements (typically 6–10 measurements per year), and whose spatial coverage and sampling frequency are low. The reconstructed data could be used for various applications related to analyzing historical variability and change in river thermal characteristics, as well as implications on aquatic ecosystem health. An example application is the presented historical trends, which could be expanded to heat fluxes analyses [10]. The dataset could also provide a useful basis for calibration/validation of process-based water temperature models, e.g., River Basin Model [11] and Dynamic Water Temperature Model [12], and as a baseline condition to compare future climate projections [13,14]. The dataset could also be used for analyzing climatic and basin drivers of water temperature variability and change [6,10,15]. Furthermore, the dataset could provide a useful basis for analyzing the effects of changing water temperature on water quality [16] and aquatic species habitat [17,18,19].

Author Contributions

Conceptualization, R.R.S.; data curation, analyses, J.C.P.; writing—original draft preparation, R.R.S.; writing—review and editing, R.R.S. and J.C.P.; visualization, J.C.P.; supervision, R.R.S.; project administration, R.R.S. All authors have read and agreed to the published version of the manuscript.

Funding

This study was conducted with internal funding from Environment and Climate Change Canada.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Reconstructed water temperature data are available through the Government of Canada data portal: https://catalogue.ec.gc.ca/geonetwork/srv/eng/catalog.search#/metadata/cc103402-ba59-43eb-820e-f319b6b5f9b4 (accessed on 23 February 2023). Gridded air temperature and observed discharge and water temperature datasets are available through the original sources provided in citations.

Acknowledgments

We thank Laurent de Rham (ECCC) for providing water temperature records from the river–ice database. We acknowledge Marco Toffolon (University of Trento) for making available the air2stream model code.

Conflicts of Interest

The authors declare no conflict of interest.

Appendix A. Figures and Tables

Figure A1. Historical trends in monthly water temperature over 1980–2018. The results show significantly increasing trends at 5 and 10% levels; no significantly decreasing trends were detected. The station numbers correspond to the station identifiers listed in Table A1.
Figure A1. Historical trends in monthly water temperature over 1980–2018. The results show significantly increasing trends at 5 and 10% levels; no significantly decreasing trends were detected. The station numbers correspond to the station identifiers listed in Table A1.
Data 08 00048 g0a1aData 08 00048 g0a1bData 08 00048 g0a1cData 08 00048 g0a1d
Table A1. Summary of streamflow stations in the water temperature database. WSC_ID corresponds to Water Survey of Canada hydrometric station identifiers.
Table A1. Summary of streamflow stations in the water temperature database. WSC_ID corresponds to Water Survey of Canada hydrometric station identifiers.
Station #WSC_IDWSC Discharge Station NameLatitudeLongitudeDrainage Area (km2)
105CB001Little Red Deer River near the Mouth52.0282−114.14032578
205CC001Blindman River near Blackfalds52.3540−113.79471796
305CC007Medicine River near Eckville52.3196−114.34421916
407BE001Athabasca River at Athabasca54.7220−113.288074,602
507CD001Clearwater River at Draper56.6853−111.255430,799
607DA001Athabasca River below Fort Mcmurray56.7804−111.4022132,588
707EA005Finlay River above Akie River57.0751−125.149915,600
807EC002Omineca River above Osilinka River55.9169−124.56765560
907FC001Beatton River near Fort St. John56.2784−120.699915,600
1007GE001Wapiti River near Grande Prairie55.0713−118.802911,300
1107GJ001Smoky River at Watino55.7146−117.623150,300
1207HC001Notikewin River at Manning56.9200−117.61844679
1307JD002Wabasca River at Highway No. 8857.8746−115.389135,800
1407OB001Hay River Near Hay River60.7430−115.859651,700
1507OC001Chinchaga River near High Level58.5971−118.334110,370
1607RD001Lockhart River at Outlet of Artillery Lake62.8941−108.466026,600
1708EC013Babine River at Outlet of Nilkitkwa Lake55.4265−126.69766760
1808EE004Bulkley River at Quick54.6186−126.90007340
1908EF001Skeena River at Usk54.6319−128.430642,300
2008FB006Atnarko River near the Mouth52.3601−126.00592550
2108KA004Fraser River at Hansard54.0787−121.850418,000
2208KA007Fraser River at Red Pass52.9863−119.00671710
2308KB001Fraser River at Shelley54.0037−122.624732,400
2408KH006Quesnel River near Quesnel52.8431−122.225311,500
2508LF051Thompson River near Spences Bridge50.3546−121.393655,400
2608MC018Fraser River near Marguerite52.5303−122.4443114,000
2708MF005Fraser River at Hope49.3860−121.4542217,000
2808MF040Fraser River above Texas Creek50.6137−121.8534154,000
2908NA002Columbia River at Nicholson51.2436−116.91296660
3008NB005Columbia River at Donald51.4833−117.18049700
3108NL007Similkameen River at Princeton49.4597−120.50351810
3208NL022Similkameen River near Nighthawk48.9847−119.61729190
3308NL038Similkameen River near Hedley49.3770−120.15235580
3409AB001Yukon River at Whitehorse60.7445−135.064019,600
3509BC001Pelly River at Pelly Crossing62.8297−136.580648,900
3609BC004Pelly River below Vangorda Creek62.2208−133.377821,900
3709CD001Yukon River above White River63.0825−139.4969149,000
3809DD003Stewart River at The Mouth63.2822−139.254451,000
3909EA003Klondike River above Bonanza Creek64.0428−139.40787810
4009ED001Yukon River at Eagle64.7894−141.1978288,000
4110AA001Liard River at Upper Crossing60.0508−128.906932,600
4210AA004Rancheria River near the Mouth60.2042−129.55005100
4310AB001Frances River near Watson Lake60.4739−129.118912,800
4410BE001Liard River at Lower Crossing59.4125−126.0972104,000
4510BE004Toad River above Nonda Creek58.8550−125.38262540
4610BE013Smith River near the Mouth59.5533−126.48063740
4710CB001Sikanni Chief River near Fort Nelson57.2382−122.69152180
4810CD001Muskwa River near Fort Nelson58.7881−122.661620,300
4910EA003Flat River near the Mouth61.5300−125.41088560
5010EB001South Nahanni River above Virginia Falls61.6361−125.797014,500
5110ED001Liard River at Fort Liard60.2416−123.4754222,000
5210ED002Liard River near the Mouth61.7427−121.2280275,000
5310GC001Mackenzie River at Fort Simpson61.8684−121.35891,301,440
5410LC002Mackenzie River (East Channel) at Inuvik68.3742−133.76481,703,387
5510LC014Mackenzie River at Arctic Red River67.4560−133.75331,680,000
Table A2. Statistical performance of the best performing air2stream model compared to observed water temperature records over the data reconstruction period 1980–2018. the number of air2stream model parameters and number of water temperature observations are also included.
Table A2. Statistical performance of the best performing air2stream model compared to observed water temperature records over the data reconstruction period 1980–2018. the number of air2stream model parameters and number of water temperature observations are also included.
Station #WSE_IDMAE (°C)NSEKGERSRBest Performing No. ParametersNo. Non-Zero Observed Water Temperature Records
105CB0011.150.920.960.285249
205CC0011.060.940.960.255252
305CC0071.040.940.950.255251
407BE0010.850.960.940.197368
507CD0010.720.960.970.19588
607DA0010.960.960.970.215264
707EA0050.660.960.970.2054777
807EC0020.970.920.910.2874457
907FC0011.570.860.890.377227
1007GE0010.820.930.950.26599
1107GJ0010.960.930.950.275111
1207HC0010.930.930.930.265186
1307JD0020.900.930.910.265111
1407OB0011.300.910.900.305132
1507OC0011.060.930.950.265156
1607RD0011.440.790.850.46492
1708EC0131.170.940.940.2531264
1808EE0040.670.970.980.1781102
1908EF0011.120.880.880.347785
2008FB0060.690.970.970.1751370
2108KA0041.460.850.890.397421
2208KA0071.080.880.940.355656
2308KB0010.600.970.990.1674050
2408KH0060.930.950.970.2283480
2508LF0511.060.940.960.2454841
2608MC0181.330.870.870.354621
2708MF0050.970.950.970.2373616
2808MF0400.840.970.980.1654553
2908NA0021.610.840.900.405228
3008NB0050.990.930.960.2651969
3108NL0071.240.890.940.337822
3208NL0221.290.910.910.307833
3308NL0381.340.890.910.337262
3409AB0011.020.920.910.277639
3509BC0011.080.910.950.305179
3609BC0041.050.910.930.317200
3709CD0011.150.920.940.285117
3809DD0031.120.920.880.28389
3909EA0030.520.960.970.1971232
4009ED0010.820.930.940.2651321
4110AA0010.830.940.910.247411
4210AA0040.940.920.920.287115
4310AB0010.560.950.950.225491
4410BE0011.250.870.870.365218
4510BE0041.160.830.830.414231
4610BE0131.300.880.880.343180
4710CB0011.160.850.890.395193
4810CD0011.210.880.940.355199
4910EA0030.760.930.960.277240
5010EB0010.920.920.930.2983382
5110ED0010.960.930.890.268195
5210ED0020.750.940.930.245158
5310GC0010.510.970.950.16579
5410LC0020.600.940.810.25451
5510LC0140.930.930.870.273199
Table A3. Decadal trends (°/decade) obtained from the simulated water temperature records. The results summarize monthly trends for June to September together with June to September averages. The bold and underlined values indicate significant trends at p ≤ 0.05 and p ≤ 0.10, respectively.
Table A3. Decadal trends (°/decade) obtained from the simulated water temperature records. The results summarize monthly trends for June to September together with June to September averages. The bold and underlined values indicate significant trends at p ≤ 0.05 and p ≤ 0.10, respectively.
Station #WSC_IDJuneJulyAugustSeptemberJune–September
105CB0010.080.210.200.230.18
205CC0010.130.310.290.320.27
305CC0070.150.350.210.270.21
407BE001−0.010.210.330.390.20
507CD0010.180.250.160.260.22
607DA0010.240.240.220.260.25
707EA0050.320.080.140.050.12
807EC0020.250.320.420.040.29
907FC0010.110.100.250.370.16
1007GE001−0.020.190.160.370.19
1107GJ0010.150.150.140.170.13
1207HC0010.100.040.070.370.17
1307JD0020.200.200.180.450.29
1407OB0010.100.120.060.150.08
1507OC0010.190.090.160.370.25
1607RD0010.890.880.340.390.65
1708EC0130.760.480.300.090.45
1808EE0040.120.190.200.050.16
1908EF0010.350.951.730.951.01
2008FB0060.221.220.420.080.56
2108KA0040.050.060.190.060.10
2208KA0070.290.220.120.070.17
2308KB0010.080.130.370.040.15
2408KH0060.010.120.220.100.12
2508LF0510.140.240.170.120.16
2608MC0180.100.460.440.170.28
2708MF0050.220.270.370.280.28
2808MF0400.130.410.300.140.25
2908NA0020.240.240.130.110.18
3008NB0050.270.210.100.100.16
3108NL0070.260.900.760.520.62
3208NL0220.150.620.490.420.39
3308NL0380.130.850.910.740.66
3409AB0010.230.000.070.150.13
3509BC0010.200.000.180.160.11
3609BC0040.280.000.270.290.20
3709CD0010.11-0.010.120.150.10
3809DD0030.51-0.010.360.380.32
3909EA0030.110.040.070.150.09
4009ED0010.190.010.140.170.12
4110AA0010.060.020.190.130.09
4210AA0040.210.020.240.230.16
4310AB0010.190.020.130.110.11
4410BE0010.120.070.230.180.11
4510BE0040.360.130.310.180.22
4610BE0130.180.060.390.230.17
4710CB0010.150.140.200.140.14
4810CD0010.060.100.260.210.10
4910EA0030.040.080.220.300.20
5010EB0010.100.100.140.150.12
5110ED0010.010.080.190.140.14
5210ED0020.120.070.120.140.11
5310GC0010.190.070.120.210.08
5410LC0020.220.050.500.650.39
5510LC0140.690.230.360.430.40

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Figure 1. Location map of the river water temperature stations across western Canada. The mean observed June–September water temperature over the period of 1980–2018 is also shown. The station numbers correspond to the station identifiers listed in Table A1.
Figure 1. Location map of the river water temperature stations across western Canada. The mean observed June–September water temperature over the period of 1980–2018 is also shown. The station numbers correspond to the station identifiers listed in Table A1.
Data 08 00048 g001
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Shrestha, R.R.; Pesklevits, J.C. Reconstructed River Water Temperature Dataset for Western Canada 1980–2018. Data 2023, 8, 48. https://doi.org/10.3390/data8030048

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Shrestha RR, Pesklevits JC. Reconstructed River Water Temperature Dataset for Western Canada 1980–2018. Data. 2023; 8(3):48. https://doi.org/10.3390/data8030048

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Shrestha, Rajesh R., and Jennifer C. Pesklevits. 2023. "Reconstructed River Water Temperature Dataset for Western Canada 1980–2018" Data 8, no. 3: 48. https://doi.org/10.3390/data8030048

APA Style

Shrestha, R. R., & Pesklevits, J. C. (2023). Reconstructed River Water Temperature Dataset for Western Canada 1980–2018. Data, 8(3), 48. https://doi.org/10.3390/data8030048

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