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Discussion papers
https://doi.org/10.5194/acp-2019-199
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-199
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 25 Apr 2019

Research article | 25 Apr 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Impact of poleward heat and moisture transports on Arctic clouds and climate simulation

Eun-Hyuk Baek1, Joo-Hong Kim2, Sungsu Park3, Baek-Min Kim4, and Jee-Hoon Jeong1 Eun-Hyuk Baek et al.
  • 1Faculty of Earth and Environmental Sciences, Chonman National University, 77 Yongbong-ro, Buk-gu Gwangju, 61186, South Korea
  • 2Unit of Arctic Sea-Ice Prediction, Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, South Korea
  • 3School of Earthand Environmental Sciences, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
  • 4Department of Environmental Atmospheric Sciences, Pukyong National University, 49 Yongso-ro, Nam-gu, Busan, 48513, South Korea

Abstract. Clouds play an important role in regulating the Earth's global radiation budget. Many General Circulation Models (GCMs) have difficulty in simulating Arctic clouds and climate with a large inter-model spread. In an attempt to address this issue, we compare an Atmospheric Model Inter-comparison Project (AMIP) simulation from the Community Atmosphere Model version 5 (CAM5) with that from the Seoul National University (SNU) Atmosphere Model version 0 with a Unified Convection Scheme (SAM0). Over the Arctic, it was found that SAM0 simulates more cloud fraction and cloud liquid mass than CAM5, reducing the Arctic clouds biases in CAM5. The budget analysis indicates that this improvement is associated with an enhanced net condensation rate of water vapor into the liquid condensate of the Arctic low-level stratus, which in turn is driven by enhanced poleward transports of heat and moisture by mean meridional circulation and transient eddies. The reduced Arctic cloud biases lead to improved simulations of surface radiation fluxes and near-surface air temperature over the Arctic throughout the year. The association between the enhanced poleward transports of heat and moisture and more liquid stratus over the Arctic is also evident in the multi-models analysis. Our study indicates that the proper simulation of poleward heat and moisture transport is one of the key factors necessary for improving the simulations of Arctic clouds and climate.

Eun-Hyuk Baek et al.
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Short summary
Clouds play an important role in regulating the Earth's global radiation budget. Many General Circulation Models (GCMs) have difficulty in simulating Arctic clouds and climate. By analyzing various model simulation results, we found that the proper simulation of poleward heat and moisture transport is one of the key factors necessary for improving the simulations of Arctic clouds and climate.
Clouds play an important role in regulating the Earth's global radiation budget. Many General...
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