Multi-decadal historical regional hydroclimate simulation with two mid 21st century Pseudo-Global Warming futures over Alaska and the Yukon at 4 km resolution
Hydroclimate and terrestrial hydrology greatly influence the local communities, ecosystems, and economies across Alaska and Yukon River Basin. Therefore, we utilized the Regional Arctic Systems Model (RASM) to model the coupled land-atmosphere, and generated a climate and hydrology dataset at 4-km grid spacing to improve our understanding of the regional hydroclimate and terrestrial hydrology. Our model domain encompasses all of the U.S. State of Alaska, the entire Yukon River Basin, part of Western Canada, and the eastern coastal region of Russia. This dataset includes 1) one simulation of the historical climate (Water Years 1991-2021), which serves as a benchmark for climate change studies, and 2) two future simulations (Equivalent Water Years 2035-2065) using the Pseudo-Global Warming method under future greenhouse gas emission scenario SSP2-4.5. The two future scenarios represent median and high changes derived from ensemble means across different Global Climate Models in the Coupled Model Intercomparison Project Phase 6 within SSP2-4.5 respectively. The microphysics schemes in the Weather Research and Forecast (WRF) atmospheric model were manually tuned for optimal model performance. The land component in RASM was replaced using the Community Terrestrial Systems Model (CTSM) given its comprehensive process representations for cold regions. We conducted optimization for uncoupled CTSM to improve its performance in terrestrial hydrologic simulations, especially streamflow and snow (Cheng et al., 2023). In order to maintain the quality for both hydroclimate and terrestrial hydrologic simulation, we implemented a strategy of iterative testing and re-optimization of CTSM. This dataset was then generated using RASM with optimized CTSM parameters and manually tuned WRF microphysics. The historical simulation was evaluated against multiple observational datasets for five key weather variables and hydrologic fluxes, including precipitation, air temperature, snow fraction, evaporation-to-precipitation ratios, and streamflow. The evaluation details can be found in Cheng et al. (2024).
Temporal Range:
1990-10-01 00:00 +0000 to 2065-10-01 00:00 +0000
(Entire dataset)
Period details by dataset productPeriod details by dataset product1990-10-01 00:00 +0000 to 2065-10-01 00:00 +0000 (CTSM_lnd_h0, ERA5, PGW004, PGW005 files)1990-10-01 00:00 +0000 to 2065-10-01 00:00 +0000 (CTSM_lnd_h1, ERA5, PGW004, PGW005 files)1990-10-01 00:00 +0000 to 2021-10-01 00:00 +0000 (CTSM_lnd_h2, ERA5 WY1991-WY2021 files)2034-10-01 00:00 +0000 to 2065-10-01 00:00 +0000 (CTSM_lnd_h2, PGW004 WY2035-WY2065 files)2034-10-01 00:00 +0000 to 2065-10-01 00:00 +0000 (CTSM_lnd_h2, PGW005 WY2035-WY2065 files)1990-10-01 00:00 +0000 to 2021-10-01 00:00 +0000 (CTSM_lnd_h3, ERA5 WY1991-WY2021 files)2034-10-01 00:00 +0000 to 2065-10-01 00:00 +0000 (CTSM_lnd_h3, PGW004 WY2035-WY2065 files)2034-10-01 00:00 +0000 to 2065-10-01 00:00 +0000 (CTSM_lnd_h3, PGW005 WY2035-WY2065 files)1990-10-02 00:00 +0000 to 2065-10-01 00:00 +0000 (WRF_atm_ha, ERA5, PGW004, PGW005 files)1990-10-02 00:00 +0000 to 2065-10-01 00:00 +0000 (WRF_atm_hcl, ERA5, PGW004, PGW005 files)1990-11-01 00:00 +0000 to 2021-10-01 00:00 +0000 (WRF_atm_hda, ERA5 WY1991-WY2021 files)2034-11-01 00:00 +0000 to 2065-10-01 00:00 +0000 (WRF_atm_hda, PGW004 WY2035-WY2065 files)2034-11-01 00:00 +0000 to 2065-10-01 00:00 +0000 (WRF_atm_hda, PGW005 WY2035-WY2065 files)1990-10-01 06:00 +0000 to 2021-10-01 00:00 +0000 (WRF_atm_hpm, ERA5 WY1991-WY2021 files)2034-10-01 06:00 +0000 to 2065-10-01 00:00 +0000 (WRF_atm_hpm, PGW004 WY2035-WY2065 files)2034-10-01 06:00 +0000 to 2065-10-01 00:00 +0000 (WRF_atm_hpm, PGW005 WY2035-WY2065 files)
Longitude Range: Westernmost=175.789W Easternmost=107.896W
Latitude Range: Southernmost=49.625N Northernmost=75.801N
Detailed coverage informationDetailed coverage information0.053° x 0.03° from 184.211E to 225.789E and 50.012N to 69.885N (782 x 662 Longitude/Latitude)4km x 4km (at 64N) oriented 155W (782x662 Lambert Conformal starting at 50.012N,175.789W)4km x 4km (at 64N) oriented 155W (782x663 Lambert Conformal starting at 49.996N,175.78W)4km x 4km (at 64N) oriented 155W (783x662 Lambert Conformal starting at 50.006N,175.813W)
Data Contributors:
CU/INSTAAR
Institute of Arctic and Alpine Research, University of Colorado Boulder
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UCAR/NCAR/RAL/HAP
Hydrometeorological Applications Program, Research Application Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research
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