Abstract
Climate change has already influenced lake temperatures globally, but understanding future change is challenging. The response of lakes to changing climate drivers is complex due to the nature of lake-atmosphere coupling, ice cover, and stratification. To better understand the diversity of lake responses to climate change and give managers insight on individual lakes, we modelled daily water temperature profiles for 10,774 lakes in Michigan, Minnesota, and Wisconsin for contemporary (1979–2015) and future (2020–2040 and 2080–2100) time periods with climate models based on the Representative Concentration Pathway 8.5, the worst-case emission scenario. In addition to lake-specific daily simulated temperatures, we derived commonly used, ecologically relevant annual metrics of thermal conditions for each lake. We include all supporting lake-specific model parameters, meteorological drivers, and archived code for the model and derived metric calculations. This unique dataset offers landscape-level insight into the impact of climate change on lakes.
Design Type(s) | data integration objective |
Measurement Type(s) | hydrodynamics |
Technology Type(s) | computational modeling technique |
Factor Type(s) | observation period |
Sample Characteristic(s) | Midwest Region • lake |
Machine-accessible metadata file describing the reported data (ISA-Tab format)
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Background & Summary
Understanding how lake ecosystems are affected by climate change is challenging. The response of lakes to changing climate drivers is not always straightforward due to the complex nature of lake-atmosphere coupling and stratification1,2. Lakes have highly diverse characteristics that make individual lake climate response difficult to predict. Attributes such as water clarity3, lake size and shape4, surrounding canopy cover5, and depth6 all affect how lakes gain, lose, and distribute thermal energy. These attributes interact in complex and difficult to predict ways to determine how a lake responds to changes to meteorological drivers1. Using all information available when evaluating how lakes will respond individually is important to understanding and managing for climate change in lakes. Furthermore, understanding the response of biota to changes in seasonal dynamics of stratification and temperature is challenged by complex behavior and life histories that are influenced by multiple temperature cues7–9. To fully evaluate how climate change might affect lakes, the full annual dynamics of water temperature are required.
Most previous research projecting lake temperature trends has focused on annual or seasonal averages1,10,11. Furthermore, at large scales, researchers have typically relied on statistical models12 or lake ‘archetypes’13–15 to reduce the large computational and metadata requirements when examining large numbers of lakes across a continuum of key attributes. In contrast, this dataset focuses on real lakes and daily estimated temperature profiles, based on site- and lake-specific data, allowing for detailed examination of climate change effects on specific temperature metrics relevant to the biological and biogeochemical functioning of lakes.
Here we present a database of daily simulated water temperature profiles in 10,774 midwestern United States lakes for contemporary (1979–2015) and two future periods (2020–2039 and 2080–2099). This database includes basic lake-specific attributes relevant to stratification and temperature trends where available. These include lake location and morphological information, water clarity estimates, surrounding canopy height, and all in-situ observations of water temperature.
The motivation for this simulated dataset was to address several questions relevant to managing thousands of lakes in the midwestern United States in a changing climate. For example, (1) How diverse is the response to climate change of a regional population of lakes? (2) What does this diverse response to climate change mean for inland fisheries? (3) What does climate change mean for broad-scale processes, such as nutrient cycling? This novel modeling approach can help fill the gaps in past water temperature data as well as project a scenario of future changes to improve our understanding of the impacts of climate change on lakes and their biota.
Methods
Modeling contemporary and future water temperatures across Michigan, Minnesota, and Wisconsin requires integrating diverse methods, models and datasets. Preliminary methods used to model lake temperatures for 2,368 lakes in Wisconsin, USA were described in brief in previous publications16,17. Here we document the entire modeling process, highlighting improvements and updates to the modeling approach.
The modeling framework (Fig. 1) consisted of (1) the collation of required and optional lake-specific characteristics across the modeled region and identification of lakes with sufficient data, (2) setup and run of the 1-dimensional hydrodynamic model, and (3) output of raw daily simulated water temperature, and calculation of annual, ecologically relevant thermal metrics.
Hydrodynamic model
At the core of the modeling framework is a lake hydrodynamic model that uses inputs of lake-specific properties and local meteorology to estimate water temperature. Our chosen model is the open source, General Lake Model (GLM) version 2.2.0 (ref. 18). GLM is a one-dimensional dynamical model which simplifies lakes using a vertical approximation, where horizontal variability is ignored. GLM uses a Lagrangian approach to layer structure where layers can split and combine based on changing vertical gradients. GLM is a modern, implementation of other one-dimensional models19,20.
The water budget of GLM can include surface and groundwater inflows/outflows as well as precipitation and evaporation. In our simulations, evaporation is an important energy flux and is included. Precipitation is also included as this replaces water lost to evaporation. We did not include surface or groundwater flows as they were not generally available across the 10,774 lakes and were not a significant contributor to the energy budget of most lakes16. Despite the generally small impact of surface inflows on the energy budget16, in some lakes, the imbalance of precipitation and evaporation and a lack of compensatory surface or groundwater flows resulted in a long-term negative trend in lake volume. To counteract this while minimizing the impact on temperatures, across all lakes we increased rainfall volume by 17 cm per month during the summer months (July, August, and September). Excess water volume input through precipitation was simply lost to generic overflow (which does not induce mixing) when the lake height exceeds the crest height. This maintained reasonable lake volumes for all simulation periods.
In GLM, Energy lost and gained through the surface layer of the lake models is tabulated for each timestep and converted to temperature increases or decreases. Surface energy fluxes include shortwave radiation, longwave radiation, and sensible and latent heat fluxes. Incoming shortwave and longwave radiation are time series inputs to the model, while the outgoing longwave radiation flux is calculated as a function of surface temperature. Sensible and latent heat fluxes are estimated by GLM as a function of surface temperature and the time series drivers of air temperature, relative humidity, and windspeed18. For each timestep, these fluxes are summed and result in lowering or increasing the surface water temperature (or ice formation). Ice formation, loss, and snow is modeled using the same structure as other existing 1-dimensional hydrodynamic models, a three-layer system of white ice, blue ice, and snow21,22.
Temperatures in the layers below the uppermost surface layer are altered for each time step according to the amount of vertical mixing generated by wind, convection, or inflows; the model also estimates warming of the water column contributed by the attenuation of penetrating shortwave radiation. For our modeling efforts, surface flows were ignored, so all mixing energy originated from wind energy or convective heat loss. The momentum flux from wind is partitioned by GLM into three fates for the kinetic mixing energy, and each is parameterized separately. This energy is converted into wind stirring, wind shear, and Kelvin-Helmholtz billows, and the efficiency of these energetic fates are parameterized user-defined constants (Table 1). As in a previous work16, we scaled the momentum flux (impacting the magnitude of all three) according to sheltering from a local canopy buffer (see Model Parameter sub-section). Convective mixing is quantified by the turbulent velocity scale of convective cooling (w*23) calculated for the GLM lagrangian model following (ref. 19). The contribution of light attenuation to water column warming is calculated according to the Beer-Lambert Law, which parametrizes an exponential attenuation of energy with increasing depth24. Attenuated solar radiation is converted into thermal energy, and thus a temperature increase.
Meteorological data
Meteorological data used to drive the lake simulations have two primary sources, the North American Land Data Assimilation25 (NLDAS; http://ldas.gsfc.nasa.gov/nldas) and downscaled Global Climate Models (GCMs). NLDAS was used to drive back-cast simulations (1979–2015). To represent future climate conditions under anthropogenic climate change, we used six regionally downscaled GCMs from the Coupled Model Intercomparison Project Phase 5 (CMIP5). Of the GCMs available in the CMIP5 archive, we selected a subset of models that met three requirements. (1) sufficient spatial resolution for the downscaling procedure, (2) satisfactory representation of the Great Lakes Basin’s modern day climatology, and (3) represent a range of responses to show the diversity of modeled outcomes26,27 (further discussion of GCM selection by (ref. 27)). The six GCMs downscaled and used for our simulations were ACCESS, CNRM, GFDL, IPSL, MIROC5, and MRI (Table 2). All GMCs were driven by the representative concentration pathway 8.5 (RCP8.5), which assumes high warming in response to continued growth in emissions through the end of the 21st century.
The six GCMs from CMIP5 were downscaled from the native model resolution (various) to a common horizontal 25-km grid spacing and debiased to local conditions for the overlapping 1981–2000 period. Downscaling was done using the International Centre for Theoretical Physics (ICTP) Regional Climate Model Version Four28,29 (RegCM4). Debiasing was done against observational data on air temperature, precipitation, near-surface wind speed, relative humidity, and incoming longwave and shortwave radiation using the following observational datasets: Oak Ridge National Laboratory’s Daymet30 and the Global Land Data Assimilation System (Version One, GLDAS; http://ldas.gsfc.nasa.gov/gldas/). Debiasing corrected for biases in daily mean and interannual standard deviation for each calendar day. For each day’s simulated value, the climatological mean was subtracted. The remainder was multiplied by the ratio of observed interannual standard deviation to the simulated interannual standard deviation for that calendar day. Finally, the observed climatology for that calendar mean was added to each day’s value. Further details provided by (ref. 31).
Neither the downscaled future GCMs nor NLDAS included precipitation differentiated between snow and rain, instead including water equivalent precipitation for all seasons. For modeling winter ice cover, it is important to differentiate between snow and rain because snow accumulation on ice acts to reduce heat flux through increased albedo and insulation of sensible heat flux, whereas rain tends to melt or compact snow, reducing snow albedo and its insulating effect. To separate water equivalent precipitation into rain and snow for input into the lake models, we used a simple 0 °C air temperature cutoff. While air temperature was above and equal to 0 °C, all precipitation was assumed to be rain. For air temperature below 0 °C, precipitation was assumed to be snow and converted to snow. The magnitude of snowfall was based on a 1:10 conversion (1 cm rainfall equivalent to 10 cm snowfall), assuming a snow density of approximately 100 kg m−3.
To drive the one-dimensional hydrodynamic model, NLDAS and the downscaled GCMs were spatially subset to extract local, lake-specific drivers. For all lakes, the lake polygon centroid was used to extract data from the nearest grid cell of the gridded drivers. Due to the large size of the gridded driver datasets, subsets were extracted from remote servers hosting the data using the Geo Data Portal32 access from R using the package geoknife33. Beyond the conversion to snow, all subset NLDAS and GCM data were used without modification with the exception of wind speed data from NLDAS. Wind speeds in the study region showed a small step change in average annual magnitude before and after December 31st, 2001 that is attributed to a switch from back-casting to now-casting of the NLDAS system. To compensate for this, all wind speed values after December 31, 2001 were multiplied by a correction factor (0.921) calculated from a comparison of the speed distributions before and after the 2001 step change.
Model parameters
Estimating how lake-surrounding land cover (e.g., tall tree canopy) acts to shelter a lake from wind is important in lake hydrodynamic models4,5. Wind plays an important role in quantifying surface heat flux and in estimating the mixing dynamics of wind-driven turbulence (details above in modeling section). For our simulations, we used a wind sheltering model based on the lake-surrounding canopy height5. To estimate canopy height, we used an approach that uses the land-cover in a 100 meter buffer around each lake previously shown to estimate lake wind sheltering34. For the land cover source, we used the U.S. National Land Cover Database35 (NLCD 2011) to identify the dominant surrounding land-cover type for each lake. The dominant land-cover was used to select an average canopy height for each type using the lookup table34 (Supplementary Table 1).
For sub-surface lake morphology, GLM is parameterized using lake hypsometry, or the relationship between depth and area. For hypsometry for our lakes, we used a tiered approach. When available, observed lake hypsometry was used to parameterize the model. But for most lakes, hypsometry is not known, or has not been digitized. For those lakes, we used an estimate of maximum depth and assumed a conical hypsometric profile. We required either hypsometry or an observation of maximum depth to run a lake model, and the lack of maximum depth was the most common reason a lake was excluded from this modeling effort.
Average light attenuation (Kd) is an important parameter in estimating lake thermal structure as it controls the vertical distribution of radiative heat flux. To parameterize our model, we used in situ Secchi observations from a variety of databases. The majority of data came from the state natural resources departments (the Michigan, Minnesota and Wisconsin Departments of Natural Resources). Other minority providers included, but were not limited to the U.S. Geological Survey, tribal agencies, and local county or municipalities. The observed Secchi depth observation was converted to light attenuation using a constant conversion coefficient of 1.7 (ref. 36). When more than one observation was available for a single lake, we took the annual mean of all Secchi observations before converting to light attenuation. If no in situ observations were available, the overall average mean Secchi value (2.46 meters) was used. Of the 10,774 modeled lakes, 5,716 had in situ Secchi observations, while the remaining 5,058 use the global mean Secchi.
Modeled lakes
All lakes modeled as part of this study were selected from the U.S. Geological Survey’s National Hydrography Dataset, specifically the 1:100 k, medium resolution product37 (NHD; accessed January 2016). To align with previous large-scale lake data collection efforts38 and to reduce the number of candidate lakes to a more manageable number, we adopted a 4 hectare minimum size cutoff (based on lake polygon areas calculated from the NHD). With the cutoff, there were 27,315 individual lakes. Of these, only lakes with available observed maximum depth (or hypsometry) and coverage from gridded driver data (10,774 lakes) were modeled.
Thermal habitat metrics
Derived thermal metrics were calculated for all simulated lakes to enable easier use of the large simulation output and that may be of use towards answering a variety of limnological questions. These derived outputs are a generic set of metrics that were chosen to be broadly applicable to questions of change in lake thermal structure due to climate change. While the open-source released code is the primary source for details on the calculation methods (Table 3), we have also included the full list of derived outputs (Supplementary Table 2) and briefly discuss the thermal metrics and how they were calculated.
The core metrics include calculated annual metrics of broad interest. Growing degree days with base temperatures of 0, 5, and 10 °C were calculated as a measure of cumulative thermal energy. Ice cover duration was included and defined as the total number of days with ice cover and includes all days in which the lake was ice covered, not just the longest contiguous period. Ice onset date and ice breakup date were calculated and defined as the last open day of the year in the fall/winter and the first open day of the year in the spring. Using the previous ice off date definition, the coefficient of variability (standard deviation divided by the mean) of surface water temperatures for 0 to 30 days after ice-off and for 30 to 60 days after ice-off was calculated.
Common stratification metrics were included for those interested in predicted changes to mixing and stratification39. Overall stratification duration was calculated as the number of days in the longest contiguous stratified period, where lakes were considered stratified when the water column temperature difference from the surface to bottom of the lake was equal or greater than 1 °C. Stratification onset date was also calculated as the first modeled day meeting the earlier definition of stratified. Using the first day of stratification as defined earlier, bottom temperature at stratification onset was extracted. The average thermocline depth during the stratified period was calculated using the R package rLakeAnalyzer40 using the seasonal option to avoid erroneous calculations caused by temporary microstratification. Annual sum of daily Schmidt stability41 was calculated.
Lastly, temperatures aggregated by season and month were calculated. For all 12 months, mean and max temperatures were calculated for surface (shallowest simulated layer) and bottom (deepest simulated layer) waters. To facilitate comparison with past empirical work on lake temperature trends1,42 we included July through September annual average and maximum modeled surface temperatures for each lake and year.
Code availability
All code and Supplementary Data for the overarching modelling framework is open-source and freely available in the form of several R packages and a core hydrodynamic model hosted online on Github (Table 3). The source code for the open-source model GLM is available online at Github (https://github.com/AquaticEcoDynamics). The custom packages developed for this effort are GLMr, glmtools, lakeattributes, and mda.lakes. GLMr and glmtools are packages which automate and aid in the creation of model input files and processing of output from GLM. The mda.lakes package contains all routines to combine the collected metadata into the appropriate GLM input files and process the resulting output into the various ecologically-relevant thermal metrics. The lakeattributes package is a container for key attributes of all modeled lakes uniformly linked by NHD permanent ID (site_id identifier is a combination of ‘NHD_’ prefix and NHD permanent ID) and includes Secchi observations, water temperature observations (for validation), lake latitude/longitude, the land-use within a 100 m buffer, lake surface area, and lake hypsometry (or maximum depth). The collection of code and routines used in preparation of NHD lake data and spatial linking to attribute data is also available online at the necsc-lake-modeling Github repository. Snapshots of the source of the custom R packages used to produce these model results have been archived and have version-specific DOI references (Table 3).
Data Records
The model output data are available as a number of tab-separated text files, zip archive files, and shapefile (Data Citation 1; Table 4). The zip archive files contain the raw water temperature outputs for all lakes as individual comma-separated files. The zip files are split into groups of 1,000 lakes to avoid distributing a single 20 gigabyte zip file. A lookup table is included to map individual lake IDs to the relevant zip archive files. Annual thermal habitat metrics derived from the raw simulation data are also available as a single file with a row for each lake and year. The shapefile includes polygons for all simulated lakes indexed by the same site identifier used throughout the data release.
The dataset output is organized by output type (i.e., raw temperature, derived metrics, and meteorological drivers) and is distributed as different sets of files. The output based on NLDAS includes data from each lake and year from 1979–2015. All GCM-based output includes data from each lake for each year within three time periods 1981–2000, 2040–2059, 2080–2099.
Also included in the data release are packaged input data (Table 4) that include all lake-specific drivers and parameters used in each simulation. All processed meteorological drivers are saved as lake-specific CSV files (the specific CSV format is input-ready for running GLM) and packaged in zip archives, organized by meteorological driver dataset. All raw model input files are combined and archived as a JSON-formatted ASCII file. A shapefile of all modeled lakes has the modeled subset of the NHD and an attached attribute table that includes lake metadata from the NHD source (e.g., lake name, permanent identifier).
Technical Validation
Temperature validation
To validate the model, water temperature estimates were compared to in-situ, depth-specific temperature observations from scientific and routine monitoring collections. We collated a large number of observations across many lakes and across the modeled contemporary period (1979–2015). The sources of temperature observations were diverse, with the majority coming from state agencies, followed by collections from federal agencies and universities. Access to these data was greatly simplified by using the U.S. Geological Survey’s (USGS) Water Quality Portal, which aggregates access to multiple databases, including the U.S. Environmental Protection Agency (EPA) Storage and Retrieval Data Warehouse (STORET) and USGS National Water Information System (NWIS) databases. Water temperature data from the North Temperate Lakes, Long-Term Ecological Research (NTL-LTER) site were also retrieved and used as part of the validation analysis. In total across the three states, 1.58 million water temperature observations were collated representing 5,103 lakes.
Before use in model validation, the data were cleaned of outliers and linked to specific lakes. All temperature data were converted to °C and all outliers<0 °C and >40 °C were removed. Any observations lacking metadata on the depth of observation were also removed. All data from the Water Quality Portal included latitude and longitude information. We used the sp package in R43 to join all point data representing the observations with the NHD lake polygons using a simple point-in-polygon technique. All temperature observations with points lacking a matching lake polygon were removed. Some observations did not correspond to simulated lakes (due to other missing metadata) so the final validation observations count used was lower than the total observations collated (Fig. 2b,d; 0.94 million matching water temp observations). For consistency and ease of comparison with past work, model error in temperature is reported as the root-mean squared error (RMSE) and error in ice-on and ice-off are reported in both RMSE and Mean Absolute Error (MAE).
All available temperature observations were paired with modeled water temperature from the same lake, depth, and date to estimate model error across lakes (Fig. 3). Overall, simulations reproduced temperature dynamics well, with an overarching all-observation RMSE of 2.79 °C (n=936,673). Average epilimnetic modeled temperatures had the lowest residual error when compared to observations, with an average epilimnetic temperature RMSE of 1.91 °C (n=72,232). Average hypolimnion temperatures had overall higher error with an RMSE of 3.14 °C (n=49,909). For detail and context on error with this large-scale modeling framework, see (ref. 16).
Ice validation
To evaluate the lake ice model, we compared observations of ice onset and breakup with estimates from the model. Ice onset and breakup observations were not as common as temperature observations, but at least one observation of ice onset or breakup date was available for 29 Wisconsin lakes from the Wisconsin Department of Natural Resources database (Fig. 2a,c; http://dnr.wi.gov/topic/surfacewater/swims/). There was a total of 724 ice onset and 548 ice breakup event observations that overlapped with simulated lakes. Observations were made between 1980 and 2015, though the observation years were biased towards earlier years (Fig. 2c).
There was large variability in lake ice breakup dates that were well represented by the model (Fig. 4). Lake ice breakup date was more accurately modeled than ice onset date. The RMSE of ice breakup and ice onset were 7.85 days and 12.30 days respectively (MAE of 5.7 and 8.0 days respectively). Bias (modeled—observed) in onset date was also higher, with modeled bias of −2.56 days ice onset. Ice breakup dates bias was lower at 1.57 days later than observed dates. Though only comparable when both ice onset and breakup were observed in the same lake in the same year, RMSE of observed versus modeled ice cover duration was 16.84 days with a 2.03 day shorter modeled ice cover bias. While lake ice models at this scale are not common, past work describing empirical modelling efforts and ice cover estimates based on satellite remote sensing can provide valuable context. For example, an empirical model of ice cover for lakes across Canada have similar error magnitude, with MAE of 8.7 and 5.2 days for ice-on and ice-off respectively13. Satellite remote sensing-based estimates of ice cover show similar error magnitude, with studies reporting various observation uncertainties (breakup RMSE values of 7.1 days and MAE of 4.2 days; ice onset MAE of 7.4 days)44. We are unaware any reported error in estimated ice cover duration. Overall, the error in modeled ice cover is similar to past broad-scale estimates of lake ice.
Usage Notes
The downscaled climate drivers represent past and future climate, not specific weather patterns. Future periods are best analyzed as period averages than single-year predictions. For the past overlapping period, the historic weather events will not be represented in the past model results based on the GCM downscaled climate drivers. These overlapping periods are included because they are useful for contrast with future periods and the evaluation of bias in model output that may be a result of the different GCMs. For analyses where the re-creation of specific weather patterns is important (for analysis of past data), use simulations based on gridded past weather (NLDAS), not downscaled GCM simulations.
Additional Information
How to cite this article: Winslow, L. A. et al. Large-scale modeled contemporary and future water temperature estimates for 10774 Midwestern U.S. Lakes. Sci. Data 4: 170053 doi: 10.1038/sdata.2017.53 (2017).
Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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Winslow, L. A., Read, J. S., & Hansen, G. J. A. ScienceBase http://dx.doi.org/10.5066/F7DV1H10 (2016)
Acknowledgements
We would like to thank a number of collaborators that have assisted over time on this project, including T.L., J.V.D.H., C.M., E.S., P.J., M.D., K.W., M.H. and K.R. This research was funded by the Department of the Interior Northeast Climate Science Center (Title: An Integrated Assessment of Lake and Stream Thermal Habitat under Climate Change), the Wisconsin Department of Natural Resources Federal Aid in Sport Fish Restoration (Project F-95-P, study SSBW), the U.S. National Oceanic and Atmospheric Administration (grant number NA09OAR4310108) and the U.S. Environmental Protection Agency (grant numbers 3001595939, 751B0200072, 751P1301081). We acknowledge the World Climate Research Program's Working Group on Coupled Modelling, which is responsible for the Coupled Model Intercomparison Project (CMIP), and we thank the climate modeling groups (listed in Table 2 of this paper) for producing and making available their model output. For CMIP the U.S. Department of Energy's Program for Climate Model Diagnosis and Intercomparison provides coordinating support and led development of software infrastructure in partnership with the Global Organization for Earth System Science Portals.
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L.W. developed the state-scale modelling architecture, ran the models and generated the output, and oversaw the preparation of the manuscript. G.H. developed fisheries relevant thermal and optical metrics, reviewed model results, and assisted in preparation of the manuscript. J.R. assisted in input data processing, data validation and analysis, and in the preparation of the manuscript. M.N. assisted in the generation and debiasing of downscaled meteorological drivers, preparation of drivers for modeling and assisted in the preparation of the manuscript.
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Winslow, L., Hansen, G., Read, J. et al. Large-scale modeled contemporary and future water temperature estimates for 10774 Midwestern U.S. Lakes. Sci Data 4, 170053 (2017). https://doi.org/10.1038/sdata.2017.53
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DOI: https://doi.org/10.1038/sdata.2017.53
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