Abstract
Ocean surface waves are essential to navigation safety, coastal activities, and climate systems. Numerical simulations are still the primary methods used in wave climate research, especially in future climate change scenarios. Recently, First Institute of Oceanography-Earth System Model version 2.0 (FIO-ESM v2.0), a global climate model coupled with an ocean wave model, was carried out the Coupled Model Intercomparison Project phase 6 (CMIP6) experiments. Here, we present the global monthly-mean and 3-hourly instantaneous wave parameter dataset from the FIO-ESM v2.0 CMIP6 experiments, including 700-year piControl, 165-year historical, three 86-year future scenarios (ssp125, ssp245, and ssp585, respectively), and two 150-year climate sensitive experiments (1pctCO2 and abrupt-4xCO2) simulations. Historical results show that the model can capture the basic wave climate features under climate change. These unique centuries of global wave data are from a fully coupled system and can provide the community with a vital long-term data source for scientific and engineering applications, such as wave climate research, wave-related process studies and parameterizations, as well as coastal and near-shore industry designs.
Measurement(s) | spectrum peak wave period • zero-crossing wave period • wave • height • direction |
Technology Type(s) | computational modeling technique |
Factor Type(s) | time-variant • geographic location |
Sample Characteristic - Environment | climate system • ocean |
Sample Characteristic - Location | Earth (planet) |
Machine-accessible metadata file describing the reported data: https://doi.org/10.6084/m9.figshare.12479582
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Background & Summary
Ocean surface waves (hereafter called ocean waves) are a kind of motion occurring on ocean and sea surfaces driven by surface winds. Ocean waves can travel thousands of miles with heights ranging from several centimeters to tens of meters before reaching land and vanishing. Therefore, ocean waves are valuable for navigation safety, coastal ecosystems, and offshore human activities and even play a crucial role in global and regional climate systems1,2.
A long-term dataset with high spatial resolution and temporal continuity is necessary for climate research. Although the number and coverage of in situ observations have been increasing (e.g., ICOADS)3, ocean wave data are still sparse in space and discontinuous in time. There has been nearly continuous coverage of global observations from satellite altimeters since 19854,5, but this coverage only meets the time requirements for climate research and only provides the significant wave height. Therefore, numerical simulations are still the primary method to be used in ocean wave climate research, especially in future climate change scenarios.
For historical ocean wave climate research, several global hindcast/reanalysis datasets, such as the ERA series (e.g., ERA-Interim from 1979 to 20196; ERA5 from 1979 to present7; ERA-20C from 1900 to 20108; CERA-20C from 1901 to 20109), EMC/NCEP 30-Year wave hindcast data from 1979 to 200910, GFDL Wave Hindcast from 1981 to 200911, Ifremer Wave Hindcast from 1990 to present12, CAWCR Wave Hindcast from 1979 to present13, JAR-55-Wave from 1958–201214, and other similar datasets, have been carried out worldwide.
However, ocean waves are not included in most of the state-of-the-art global climate models, which is the key tool to assess and provide future projections of climate systems. Therefore, as the growing demand to understand the response of the global wave climate to increasing greenhouse gas concentrations, especially through the Coordinated Ocean Wave Climate Project (COWCLIP)1, several studies on future ocean wave climate research have provided ocean wave information by using the output of global and regional climate models to force the standalone ocean surface wave model15,16,17,18,19,20,21,22,23,24,25,26,27,28.
Recently, the First Institute of Oceanography-Earth System Model version 2.0 (FIO-ESM v2.0)29, a global climate model coupled with the ocean wave model through the wave-induced vertical mixing, the effects of Stokes drifts and sea spray on the air-sea flux, was used to carry out the Coupled Model Intercomparison Project phase 6 (CMIP6) experiments30. FIO-ESM v2.0 was integrated for 1000 years under pre-industrial conditions (piControl experiment), and the model reached a quasi-equilibrium state after 300 years. Then, FIO-ESM v2.0 conducted the historical simulation (AD 1850–2014), three future scenario experiments (ssp126, ssp245, and ssp585 covering AD 2015–2100), and two 150-year climate sensitive experiments (1pctCO2, and abrupt-4xCO2). The preliminary results showed that FIO-ESM v2.0 could capture the basic features of the ocean waves and the climate system29.
Here, we provide the monthly mean and 3-hourly instantaneous wave parameters, including significant wave height (Hs), mean wave direction (Dm), spectrum peak wave period (Tp), and zero-crossing wave period (Tz) from the FIO-ESM v2.0 CMIP6 experiments. As the wave model is one of the components of FIO-ESM v2.0, the wave statistics from the FIO-ESM v2.0 CMIP6 experimental data are unique in multiple scientific and engineering applications, which is different from previous ocean wave datasets. The wave data over 1000 years can contribute to wave climate research, such as improving our scientific understanding of climate variabilities, long-term trends, extremes, and scenario studies. Moreover, these data can also contribute to wave-related process studies and parameterizations, as well as coastal and near-shore industry designs, etc.
Methods
In this section, we introduce the framework and configurations of FIO-ESM v2.0 and the design of the related CMIP6 experiments used in this study. FIO-ESM v2.0 is the global earth system model, which contains two parts: a coupled physical climate model and a carbon cycle model. As we did not consider the biogeochemical processes and only integrated part of the coupled physical climate model, FIO-ESM v2.0 is referred to as the coupled physical climate model in this study.
FIO-ESM v2.0 and configuration
Despite the carbon cycle model components, FIO-ESM v2.0 is a global climate model consisting of the atmosphere, land surface, river runoff, sea ice, ocean, and ocean wave model components, which are connected through a coupler (Fig. 1). The components include the Community Atmosphere Model version 5 (CAM5)31, the Community Land Surface Model version 4.0 (CLM4.0)32, the River Transport Model (RTM)33, the Los Alamos National Laboratory sea ice model version 4 (CICE4)34, the Parallel Ocean Program version 2 (POP2)35, and the MArine Science and NUmerical Modeling (MASNUM) wavenumber spectrum wave model (MASNUM-WAM)36.
There are three distinctive physical processes related to ocean waves in FIO-ESM v2.0: (1) nonbreaking surface wave-induced vertical mixing (Bv)37, which has been incorporated into both FIO-ESM v1.038 and FIO-ESM v2.029, (2) Stokes drift, which influences the air-sea relative speed in the calculation of air-sea fluxes, and (3) sea spray, which could influence the air-sea heat fluxes. Bv can dramatically improve the upper ocean temperature, salinity and current simulation ability, and the other two physical processes are incorporated into FIO-ESM to physically improve the air-sea flux parameterization for the first time. Further information on FIO-ESM v2.0 can be found in Bao et al.29.
In this work, the resolution configuration is referred to as f09_gx1v6. The horizontal resolutions are f09 with a finite volume grid (approximately 0.9° × 1.25°) for both CAM5 (with 30 vertical layers) and CLM4.0 and a nominal 1° with the northern pole displaced into Greenland for POP2 (with 61 vertical layers), CICE4 and MASNUM-WAM. The actual horizontal resolution of nominal 1° is 1.125° in longitude and varies from 0.27° (at the equator) to 0.54° (far northwest Pacific) in latitude. In the wavenumber space of MASNUM-WAM, the angular resolution is 30°, and the wavenumber grid is adopted as follows:
where
The atmosphere, land surface, and sea ice component models exchange data with the coupler every 0.5 h, while the river runoff, ocean and wave models exchange data with the coupler at 3 h intervals. The MASNUM-WAM obtains wind field at 10 m height of ocean surface and sea ice concentration (SIC) from the coupler, is integrated to produce the wavenumber spectrum, and then calculates the nonbreaking surface wave-induced vertical mixing and other necessary variables for including the effects of Stokes drift and sea spray on air-sea flux, and finally sends Bv to POP2 and other variables to the coupler (Fig. 1). SIC is used to check whether the grid is covered by sea ice (sea ice concentration greater than 30%), where the wave spectrum is set to be zero. The configuration information of FIO-ESM v2.0 is summarized in Table 1.
Related CMIP6 experiment setup
Following the CMIP6 protocols30, FIO-ESM v2.0 was conducted with the Diagnostic, Evaluation and Characterization of Klima (DECK), a historical simulation, and six CMIP-Endorsed Model Intercomparison Projects (MIPs) for participating CMIP629. As this dataset is used for wave climate research, we selected the wave output of the experiments related to the wave climate (Fig. 2, Table 2), including piControl, historical simulation, three future scenario experiments (ssp126, ssp245, and ssp585), and two climate sensitive experiments (1pctCO2, and abrupt-4xCO2). The CMIP6 forcing data are available from https://esgf-node.llnl.gov/search/input4mips/. The details of the experiments are summarized in Table 2.
piControl is the preindustrial control simulation and one of the DECK experiments, which represents a quasi-equilibrium state of the climate system under the imposed conditions. piControl is used to investigate the naturally occurring, unforced variability in the climate system and serves as a baseline for other experiments that branch from it. We integrated the FIO-ESM v2.0 initialized from observations for 1000 a with all forcing fields (e.g., solar radiative, greenhouse gas, and aerosols) fixed at AD 1850. The global mean of the net radiation at the top of the atmosphere averaged from 301 a to 1000 a is 0.07 W/m2 with a negligible linear trend of −0.0073 W/m2 per 100 years, which means that the energy balance of FIO-ESM v2.0 is excellent and that the climate system is stable. The trends of global mean sea temperature (0.0155 °C/100a), global mean sea salinity (−0.0001 pus/100a), and Atlantic Meridional Overturning Circulation (−0.1093 Sv/100a) from 301 a to 1000 a indicated that FIO-ESM v2.0 reached a quasi-equilibrium state after 300 a29. Therefore, we took the output of the last 700 years (from 301 a to 1000 a) as the piControl simulation results.
The CMIP6 historical simulation is the experiment to represent climate change over the 1850–2014 period forced by the common time-evolving forcing datasets (e.g., solar radiation, greenhouse gases, and aerosols). We integrated the historical simulation to begin in 1850, which was initialized on Jan 1st for 301 a in the piControl (Fig. 2) and ended in 2014, forced by the datasets provided by CMIP6.
The future scenario experiments, which belong to the CMIP6-Endorsed Scenario Model Intercomparison Project (ScenarioMIP), are the projections of future climate change for improving understanding of the climate systems as well as future mitigation, adaptation, and impacts for climate and societal change39. The ScenarioMIP incorporated a new future pathway of societal development called shared socioeconomic pathways (SSPs) and designed a set of eight SSPs to provide future scenario forcings. The three future scenario experiments in this work are ssp126, ssp245, and ssp585 (Fig. 2), which represent the low, medium, and high ends of the range of future forcing pathways to produce radiative forcings of 2.6 W/m2, 4.5 W/m2, 8.5 W/m2 in 2100, respectively. All three experiments began in 2015, initialized on Jan 1st of 2015 in the historical simulation, and ended in 2100, forced by the datasets provided by CMIP6.
The climate sensitive experiments are idealized CO2-forced experiments (1pctCO2 and abrupt-4xCO2) in DECK, which are used to reveal the fundamental forcing and feedback response characteristics of the models. The only externally imposed difference from piControl is the change in CO2 concentration. In the 1pctCO2 experiment, the CO2 concentration increased gradually at a rate of 1% per year. This experiment has been performed since CMIP2 and can serve as a consistent and useful benchmark for analyzing model transient climate response (TCR). In the abrupt-4xCO2 experiment, the CO2 concentration is immediately and abruptly quadrupled from the value in piControl. This experiment can be useful for diagnosing the fast responses of the system under an abrupt change in forcing and estimating a model’s equilibrium climate sensitivity (ECS). Both the 1pctCO2 and abrupt-4xCO2 branched from Jan 1st for 301 a in piControl and integrated for 150 a (Fig. 2).
Data Records
This dataset consists of global monthly mean and 3-hourly instantaneous wave parameters (significant wave height, mean wave direction, spectrum peak wave period, and zero-crossing wave period) from seven FIO-ESM v2.0 CMIP6 experiments, including 700-year piControl, 165-year historical, three 86-year future scenarios (ssp125, ssp245, and ssp585, respectively), and two 150-year climate sensitive simulation data (1pctCO2, and abrupt-4xCO2).
As the full dataset consists of approximately 3,000 files, it is divided into two collections. One collection stores the monthly data40, which are composed of 28 sub-datasets containing 52 files from four wave parameter data of 7 experiments (Online-only Table 1). The other is 3-hourly data41, which are composed of 24 sub-datasets containing 2892 files from four wave parameters data of 6 experiments (Online-only Table 2). The lists and conventions of these files are outlined in Online-only Tables 1 and 2.
The filenames of the monthly data are in the following format:
〈para_id〉_glob_FIO_FIO-ESM-2-0_<exp_id〉_r1i1p1f1_mon_〈year_start〉01-〈year_end〉12.nc
For the 3-hourly data, the filenames are in the following format: 〈para_id〉_glob_FIO_FIO-ESM-2-0_〈exp_id〉_r1i1p1f1_3hr_〈year_start〉0101〈hour〉00-〈year_end〉12312100.nc
where
para_id is the wave parameter (Table 3). Hs, Dm, Tp, and Tz represent the significant wave height, mean wave direction, spectrum peak wave period, and zero-crossing wave period, respectively.
exp_id represents the name of the CMIP6 experiments, including piControl, historical, ssp126, ssp245, ssp585, 1pctCO2, and abrupt-4xCO2.
year_start and year_end are represented by 4 digits, which are the beginning and end years of the file.
Hour is represented by 2 digits, where the beginning hour of the file is usually 00, except for 06, which is used for the first file of each sub-dataset.
All data files are provided in NetCDF format and are archived in the figshare digital repository40,41. The seven fields, including the variables of the grid information (longitude, latitude, and time) and four wave parameters in the files, are outlined in Table 3.
Technical Validation
The MASNUM-WAM is a third-generation wavenumber spectrum wave model developed by the Key Laboratory of Marine Science and Numerical Modeling in the late 1980s36. MASNUM-WAM has been calibrated and adopted many times in ocean wave simulations and hindcasts, wave-current interactions, typhoons and climate simulations, and other scientific studies37,38,42,43,44,45,46. Moreover, MASNUM-WAM is now the ocean wave component of several operational ocean forecasting systems (OFS), such as the OFS for the seas off China and adjacent areas47, OFS for Southeast Asian Seas and OFS for the 21st-Century Maritime Silk Road48. Therefore, validation of the MASNUM-WAM is not shown in this study.
The validation of FIO-ESM v2.0 against observational datasets was given in Bao et al.29. The piControl results show that the global mean of the net radiation at the top of atmosphere during the last 700 years is 0.07 W/m2 with a negligible linear trend of −0.0073 W/m2 per 100 years, which indicate the energy balance of FIO-ESM v2.0 is good and the model is stable. Furthermore, they showed that FIO-ESM v2.0 could reproduce the different aspects of the climate system in global warming, surface temperatures, precipitation, and ocean circulation, etc.
ERA57, one of the baseline datasets for wave climatology studies as well as providing the four wave parameters (significant wave height, mean wave direction, spectrum peak wave period, and zero-crossing wave period), was used to assess the simulation ability of wave parameters from FIO-ESM v2.0. As the aim of this dataset is to aid in wave climate research, we only represent validations for the climatology of the wave parameters in the following. The data derived from both ERA5 and FIO-ESM v2.0 were selected from 1979 to 2014 for analysis, and the monthly and 3-hourly simulated wave parameters were interpolated to the ERA5 grid at 0.5° × 0.5°.
Monthly significant wave height, mean wave direction, spectrum peak wave period, and zero-crossing wave period
To assess the mean state in the spatial pattern and seasonal variation in the long-term monthly data, Figs. 3–6 show the climatological distributions of the four wave parameters (Hs, Dm, Tp, and Tz) in the boreal winter (December-January-February), boreal summer (June-July-August), and annual mean from the monthly ERA-5 and FIO-ESM v2.0 historical simulation data.
Generally, comparison against the ERA5 data in terms of annual/seasonal Hs (Fig. 3) and Dm (Fig. 4) exhibits good agreement, with the centered-root-mean-square-difference (CRMSD) values less than 0.4 m and 35°, respectively, and the spatial correlation coefficients (SCCs) values greater than 0.9 and normalized standard deviation (NSD) values close to 1. However, we found relatively less model-skill in representing the spectrum peak wave period and zero-crossing wave period. The SCCs in both annual/seasonal Tp (Fig. 5) and Tz (Fig. 6) are only approximately 0.8, while the CRMSD values are approximately 1.8 s and 0.7 s, respectively. Moreover, the model-skill in the standard deviation of Tz with NSD values greater than 0.7 is better than for Tp with NSD values less than 0.55.
Although the FIO-ESM v2.0 can capture the basic characteristics of the ocean wave, there are still several biases in spatial distributions. As shown in Fig. 3, the simulated annual mean Hs values are higher approximately 0.5 m over the North Atlantic and North Pacific oceans in summer, while the higher Hs values are simulated over the tropical Pacific Ocean throughout the year. Similar to Hs, the simulated Dm (Fig. 4), Tp (Fig. 5), and Tz (Fig. 6) also exhibit the obvious biases over the North Atlantic, North Pacific, and tropical Pacific oceans. Furthermore, the simulated Tp is less than ERA5 by approximately 1–2 s (Fig. 5), while the simulated Tz is greater by approximately 0.5–1 s (Fig. 6).
The 3-hourly significant wave height
The mean state has been validated above by using monthly data, so here, we focus on the extreme conditions by using 99th-percentile values of significant wave height for the 3-hourly data. Figure 7 shows the climatological distributions of the 99-th percentile (p99) significant wave height in the boreal winter (December-January-February), boreal summer (June-July-August), and whole year from the ERA5 and FIO-ESM v2.0 historical simulation data. The p99 significant wave height is calculated on a seasonal basis for boreal winter and summer and a yearly basis for the whole year.
Similar to the comparison of the monthly significant wave height between FIO-ESM v2.0 and ERA5, FIO-ESM v2.0 can reproduce the major spatial patterns and seasonal variations in the p99 significant wave height. The SCCs between ERA5 and FIO-ESM v2.0 can reach 0.96, while the CRMSD values are less than 0.8 m with the NSD values greater than 0.7. Additionally, the simulated p99 significant wave height is also greater than ERA5, particularly over the North Atlantic, North Pacific and tropical Pacific oceans.
Overall, the above analyses indicate that both the simulated spatial distributions and seasonal variations in FIO-ESM v2.0 are broadly consistent with the ERA5 data, including not only the monthly but also the 3-hourly significant wave height data. However, the simulated wave parameters still suffer several biases, especially in the North Atlantic, North Pacific, and tropical Pacific oceans, with an approximately 10% relative difference from the ERA5 data, which is similar to other ocean wave data from COWCLIP28.
Usage Notes
For the 3-hourly data, as shown in Online-Only Table 2, because of one data file per year for each wave parameter, the file usually starts at 00 UTC on January 1 except for the first file of each experiment, which starts at 06 UTC. The days in February are always 28, as there is no leap year in the model.
All of the significant wave heights, mean wave directions, spectrum peak periods, and zero-crossing periods are on the native model grid named the Greenland dipole grid. The Greenland diploe grid is a latitude/longitude grid, with the North Pole displaced to Greenland to avoid singularity problems in the model. The data can be used with a wide range of postprocessing software (e.g., Ferret, NCL).
Code availability
The source code of FIO-ESM v2.0 will be provided upon request for the purpose of replicating the data described in this paper. The code may be requested from the corresponding author by email.
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Acknowledgements
We acknowledge two anonymous reviewers for their constructive comments and suggestions for improving the manuscript. We would like to thank the integrations engineer Radu Gheorghiu at figshare for helping manage the published wave data. This work was supported by the National Key R&D Program of China (2016YFA0602200), the Basic Scientific Fund for National Public Research Institute of China (2016S03), the National Natural Science Foundation of China (41821004 and U1806205), the AoShan Talents Cultivation Excellent Scholar Program Supported by Qingdao National Laboratory for Marine Science and Technology (2017ASTCP-ES04), and the China-Korea Cooperation Project on Northwestern Pacific Climate Change and its Prediction. All numerical experiments were carried out at the Beijing Super Cloud Computing Center (BSCC).
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All authors jointly conceived the study and contributed equally to the experimental data. Zhenya Song analyzed the data and prepared the manuscript, with all authors discussing the results and implications and commenting on the manuscript at all stages. Fangli Qiao provided scientific guidance for this work.
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Song, Z., Bao, Y., Zhang, D. et al. Centuries of monthly and 3-hourly global ocean wave data for past, present, and future climate research. Sci Data 7, 226 (2020). https://doi.org/10.1038/s41597-020-0566-8
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DOI: https://doi.org/10.1038/s41597-020-0566-8
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