Performance of a Coupled Arctic Climate Model Compared to MOSAiC Observations and its Sensitivity to a Change in Snow Thermal Conductivity ...
Climate models like the coupled Arctic atmosphere-ocean-sea ice model HIRHAM-NAOSIM are helpful to gain a deeper understanding of Arctic Amplification and interactions between atmosphere, ocean and sea ice. HIRHAM-NAOSIM is evaluated in Arctic winter compared to data from the MOSAiC expedition for F...
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Format: | Text |
Language: | English |
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Zenodo
2023
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Online Access: | https://dx.doi.org/10.5281/zenodo.7693669 https://zenodo.org/record/7693669 |
Summary: | Climate models like the coupled Arctic atmosphere-ocean-sea ice model HIRHAM-NAOSIM are helpful to gain a deeper understanding of Arctic Amplification and interactions between atmosphere, ocean and sea ice. HIRHAM-NAOSIM is evaluated in Arctic winter compared to data from the MOSAiC expedition for February 2020. A warm surface temperature bias of more than 5°C during clear-sky conditions is discussed in terms of modeled surface energy budget, clouds and atmospheric stability. HIRHAM-NAOSIM's control run underestimates the stable atmospheric stratification and has a positive bias in liquid water path and longwave radiation during observed clear-sky time periods. Though the positive longwave radiative bias outweighs the impact of a changed snow thermal conductivity and the positive temperature bias during radiatively clear state remains, a halved conductivity of 0.15 Wm -1 K -1 reduces the simulated surface temperature by up to 5°C and causes a higher occurrence of stable atmospheric conditions. ... |
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