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Evaluation of land-atmosphere processes of the Polar WRF in the summertime Arctic tundra

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Evaluation of land-atmosphere processes of the Polar WRF in the summertime Arctic tundra
Other Titles
여름 북극 툰드라 지역에서의 Polar WRF 지면-대기 과정 평가
Kim, Jeongwon
Lee, Junhong
Hong, Je-Woo
Hong, Jinkyu
Koo, Ja-Ho
Kim, Joo-Hong
Yun, Juyeol
Nam, Sungjin
Jung, Ji Young
Choi, Taejin
Lee, Bang Yong
Meteorology & Atmospheric Sciences
Polar WRF; Arctic tundra; Land-atmosphere interaction; Surface energy balance; Soil moisture; Planetary boundary layer
Issue Date
Kim, Jeongwon, et al. 2020. "Evaluation of land-atmosphere processes of the Polar WRF in the summertime Arctic tundra". ATMOSPHERIC RESEARCH, 240(1): 104946-104956.
Arctic tundra is undergoing a rapid transition due to global warming and will be exposed to snow-free conditions for longer periods under projected climate scenarios. Regional climate modeling is useful for understanding and predicting climate change in the Arctic tundra, however, the lack of in-situ observations of surface energy fluxes and the planetary boundary layer (PBL) structure hinders accurate predictions of local and regional climate around the Arctic. In this study, we investigate the performance of the Polar-optimized version of the Weather Research and Forecasting model (PWRF) in the Arctic tundra on clear days in summer. Based on simultaneous observations of surface fluxes and the PBL structure in Cambridge Bay, Nunavut, Canada, our validation shows that the PWRF simulates a drier environment, leading to a larger Bowen ratio and a warmer atmosphere compared to observations. Further sensitivity analyses indicate that the model biases are mainly from the uncertainties in physical parameters such as surface albedo and emissivity, the solar constant, and the model top height, rather than structural flaws in the model physics. Importantly, the PWRF reproduces the observations more accurately when the observed soil moisture is fed into the simulation. This indicates that there must be improvements in simulations of the land-atmosphere interaction at the Arctic tundra, not only in the accuracy of the initial soil moisture conditions but also in soil hydraulic properties and drainage processes. The mixing diagram analysis also shows that the entrainment process between the PBL and the overlying atmosphere needs to be improved for better weather and climate simulation. Our findings shed light on modeling studies in the Arctic region by disentangling the model error sources from uncertainties by parameters and physics package options.
Appears in Collections  
2020-2020, Arctic permafrost environment change monitoring and prediction method developments (20-20) / Lee, Bang Yong (PN20081)
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