资源环境科技发展态势分析平台

Clouds are a key regulator of Earth's surface energy balance. The presence or absence of clouds, along with their macroscale and microscale characteristics, is the primary factor modulating the amount of radiation incident on the surface. Recent observational studies in the Arctic highlight the ubiquity of supercooled liquid-containing clouds (LCCs) and their disproportionately large impact on surface melt. Global climate models (GCMs) do not simulate enough Arctic LCCs compared to observations, and thus fail to represent the surface energy balance correctly. This work utilizes spaceborne observations from NASA's A-Train satellite constellation to explore physical processes behind LCCs and surface energy biases in the Community Earth System Model Large Ensemble (CESM-LE) project output. On average CESM-LE underestimates LCC frequency by; 18% over the Arctic, resulting in a similar to 20Wm 22 bias in downwelling longwave radiation (DLR) over the similar to 18x10(6) km(2) area examined. Collocated observations of falling snow and LCCs indicate that Arctic LCCs produce precipitation similar to 13% of the time. Conversely, CESM-LE generates snow in similar to 70% of LCCs. This result indicates that the Wegener-Bergeron-Findeisen (WBF) process-the growth of ice at the expense of supercooled liquid-may be too strong in the model, causing ice to scavenge polar supercooled cloud liquid too efficiently. Ground-based observations from Summit Station, Greenland, provide further evidence of these biases on a more local scale, suggesting that CESM-LE overestimates snow frequency in LCCs by similar to 52% at the center of the ice sheet leading to similar to 21% too few LCCs and similar to 24Wm(-2) too little DLR.