DOI: 10.5061/dryad.bzkh189fk
title: Data from: Stream thermalscape scenarios for British Columbia, Canada

description: Water temperature is a key feature of freshwater ecosystems but
 comprehensive datasets are severely lacking, a limiting factor in research
 and management of freshwater species and habitats. An existing statistical
 stream temperature model developed for British Columbia (BC), Canada, was
 refit to predict August mean stream temperatures, a common index of stream
 thermal regime also used in thermalscapes developed for the western United
 States (US). Thermalscapes of predicted August mean stream temperature
 were produced for 680,000 km of stream network at approximately 400 m
 intervals. Temperature predictions were averaged for 20-year periods from
 1981–2100 to produce 86 scenarios: one for each historical period (i.e.,
 1981–2000, 2001–2020), and 21 for each future period (i.e., six global
 climate models and an ensemble average under three representative
 concentration pathways). The final model performance was consistent with
 other published regional-scale statistical models (R2 = 0.79, RMSE =
 1.53°C, MAE = 1.18°C), performing well given the relative paucity of data,
 large geographic extent, and range of climatic and physiographic
 conditions. Model results suggested an average increase of August mean
 stream temperature of 2.9 ± 1.0°C (RCP 4.5 ensemble mean ± SD) by end of
 century, with significant heterogeneity in predicted temperatures and
 warming rates across the province. Compared to stream temperature
 predictions from the western US, the predictions for BC showed good
 agreement at cross-border streams (Pearson’s r = 0.91), suggesting the
 possible integration of both products for a thermalscape covering much of
 western North America. These stream thermalscapes for BC address a major
 data deficiency in freshwater ecosystems and have potential applications
 to stream ecology, species distribution modelling, and evaluation of
 climate change impacts.
description: Please see Weller et al. (2023) for full methods.
 Weller, J.D., R.D. Moore & J.C. Iacarella (2023) Stream thermalscape scenarios for British Columbia, Canada, Canadian Water Resources Journal / Revue canadienne des ressources hydriques, DOI: 10.1080/07011784.2023.2267028
description: Zipped files (.zip) are stored in an ESRI geodatabase (.gdb) and
 can be accessed through open-souce GIS software (e.g., QGIS)
description: Data from: Stream Thermalscape Scenarios for British Columbia, Canada,
 Dryad, Dataset, https://doi.org/10.5061/dryad.bzkh189fk All thermalscapes
 (i.e., stream temperature layers) are stored as linear feature classes in
 'bc\_stream\_thermalscapes.gdb'. The geodatabase contains a
 linear feature class for each major drainage region in British Columbia
 (BC), Canada, as defined by the BC Freshwater Atlas (FWA). All feature
 classes share the same set of attribute fields. Full details on the
 development of the stream temperature model ('BC AugTw model')
 and associated thermalscapes can be found in 'Stream Thermalscape
 Scenarios for British Columbia, Canada' (Weller et al. 2023). The
 thermalscape network is a subset of linear stream network layers from the
 British Columbia Freshwater Atlas (FWA; information licensed under the
 Open Government Licence British Columbia): the network includes only
 'main' flow paths, and excludes lakes and reaches draining less
 than 1km^2. Linear features and key identifying attributes from the FWA
 were retained 'as is' so the thermalscapes could be directly
 compared or appended to existing spatial products based on the FWA.
 Attributes Description: LINEAR\_FEATURE\_ID: Unique linear feature ID
 (from FWA). FWA\_WATERSHED\_CODE: Position of linear feature within the
 hydrologic network (from FWA). LOCAL\_WATERSHED\_CODE: Position of linear
 feature within the hydrologic network (from FWA). WATERSHED\_GROUP\_ID:
 Numerical ID for a group of contiguous watersheds (from FWA).
 WATERSHED\_GROUP\_CODE: Code for a group of contiguous watersheds (from
 FWA). STREAM\_ORDER: Strahler stream order (from FWA). REGION: Major
 drainage region (defined by first 3 digits of FWA\_WATERSHED\_CODE).
 Tw8\_... : Predicted mean August stream temperature (Tw8) for a specific
 scenario (scenario coding details below). b1: Modelled stream thermal
 sensitivity to changes in air temperature. ext\_... : Extrapolation
 detection (ExDet) value (Bouchet et al. 2020). ExDet &lt; 0 :
 univariate, or Type 1, extrapolation; ExDet &gt; 1 : combinatorial, or
 Type 2, extrapolation; 0 &lt;= ExDet &lt;= 1 : analogous/no
 extrapolation. mic\_... : Most important covariate (MIC) contributing to
 extrapolation (Bouchet et al. 2020). NONE = no extrapolation; AREA =
 catchment area; ELEV = mean catchment elevation; LAT = latitude; GLC =
 fractional glacier cover; LAKE = fractional lake cover; T08 = mean August
 air temperature; PPT = total annual precipitation. nby\_... : % Nearby;
 percent of reference data within a 'neighborhood' around the
 prediction (Bouchet et al. 2020). Scenario Codes: 'Tw8\_...',
 'ext\_...', 'mic\_...' and 'nby\_...'
 attributes all refer to specific historical or future climate scenarios
 using a 6-character coding scheme that follows the 4-character attribute
 code (e.g., 'Tw8\_'). GCM ID: the first set of digits following
 the attribute code identifies the global climate model (GCM) for a given
 scenario. This is a single digit code ranging from 0-9: 0 = historical:
 data from historical observations or reanalysis products 1 = CanESM2 2 =
 CSIRO-Mk3-6-0 3 = GFDL-CM3 4 = HadGEM2-ES 5 = MIROC-ESM 6 = MPI-ESM-LR 9 =
 ensemble mean of GCMs 1-6 Climate forcing ID: the second set of digits
 following the attribute code identifies the representative concentration
 pathway (RCP) scenario. This is a 2-digit code: 00 = historical conditions
 (2020 and earlier) 26 = RCP 2.6 ('best case') 45 = RCP 4.5
 ('middle of the road') 85 = RCP 8.5 ('worst case')
 Time period ID: the third set of digits following the attribute code
 identifies the time period for the prediction. Predictions were made for
 20-year time periods from 1981-2100. This is a single digit code ranging
 from 0-5: 0 = 1981-2000 1 = 2001-2020 2 = 2021-2040 3 = 2041-2060 4 =
 2061-2080 5 = 2081-2100 For example, the field 'Tw8\_0\_00\_1'
 contains the predictions for August mean stream temperature for historical
 conditions during the 2001-2020 period. 'Tw8\_1\_26\_4' contains
 the predictions from the CanESM2 GCM under RCP 2.6 during the 2061-2080
 period. 'Tw8\_9\_85\_5' contains the GCM-ensemble mean under RCP
 8.5 for the 2081-2100 period. There were a total of 86\* scenarios
 produced for stream temperature predictions ('Tw8\_...').
 Extrapolation assessments ('ext\_...', 'mic\_...',
 'nby\_...') were conducted for 4 scenarios. \*An additional
 stream temperature scenario, 'Tw8\_baseline', was produced as
 the average of Tw8\_0\_00\_0 and Tw8\_0\_00\_1 for comparison to the
 baseline thermalscape scenario produced for the western United States from
 the NorWeST project (Isaak et al. 2016). References: BC Freshwater Atlas
 (FWA). Accessed from:
 ftp://ftp.geobc.gov.bc.ca/sections/outgoing/bmgs/FWA\_Public/. Bouchet,
 Phil J., David L. Miller, Jason J. Roberts, Laura Mannocci, Catriona M.
 Harris, and Len Thomas. 2020. dsmextra: Extrapolation assessment tools for
 density surface models. Methods in Ecology and Evolution 11 (11):1464-9.
 doi: https://doi.org/10.1111/2041-210X.13469. Isaak, Daniel J.; Wenger,
 Seth J.; Peterson, Erin E.; Ver Hoef, Jay M.; Hostetler, Steven W.; Luce,
 Charlie H.; Dunham, Jason B.; Kershner, Jeffrey L.; Roper, Brett B.;
 Nagel, David E.; Chandler, Gwynne L.; Wollrab, Sherry P.; Parkes, Sharon
 L.; Horan, Dona L. 2016. NorWeST modeled summer stream temperature
 scenarios for the western U.S. Fort Collins, CO: Forest Service Research
 Data Archive. https://doi.org/10.2737/RDS-2016-0033. Open Government
 Licence British Columbia:
 https://www2.gov.bc.ca/gov/content/data/open-data/open-government-licence-bc. Weller, J.D., R.D. Moore & J.C. Iacarella (2023) Stream thermalscape scenarios for British Columbia, Canada, Canadian Water Resources Journal / Revue canadienne des ressources hydriques, DOI: [10.1080/07011784.2023.2267028](https://doi.org/10.1080/07011784.2023.2267028) Disclaimer: These data are provided “as is”, and the authors provide no warranty, expressed or implied, regarding the appropriateness of these data for a particular purpose.  The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.