Cho, Mee-Hyun Yang, Ah-Ryeon Baek, Eun-Hyuk Kang, Sarah M. Jeong, Su-Jong Kim, Jin Young Kim, Baek-Min 2024-01-19T23:00:31Z 2024-01-19T23:00:31Z 2021-09-03 2018-05 0930-7575 https://pubs.kist.re.kr/handle/201004/121413 This study investigates future changes in the Arctic region and vegetation-cloud feedbacks simulated using the National Center for Atmospheric Research Community Atmosphere Model Version 3 coupled with a mixed layer ocean model. Impacts of future greening of the Arctic region are tested using altered surface boundary conditions for hypothetical vegetation distributions: (1) grasslands poleward of 60A degrees N replaced by boreal forests and (2) both grasslands and shrubs replaced by boreal forests. Surface energy budget analysis reveals that future greening induces a considerable surface warming effect locally and warming is largely driven by an increase in short wave radiation. Both upward and downward shortwave radiation contribute to positive surface warming: upward shortwave radiation decreases mainly due to the decreased surface albedo (a darker surface) and downward shortwave radiation increases due to reduced cloud cover. The contribution of downward shortwave radiation at surface due to cloud cover reduction is larger than the contribution from surface albedo alone. The increased roughness length also transported surface fluxes to upper layer more efficiently and induce more heating and dry lower atmosphere. A relatively smaller increase in water vapor compared to the large increase in low-level air temperature in the simulation reduces relative humidity and results in reduced cloud cover. Therefore, vegetation-cloud feedbacks induced from land cover change significantly amplify Arctic warming. In addition to previously suggested feedback mechanisms, we propose that the vegetation-cloud feedback should be considered as one of major components that will give rise to an additional positive feedback to Arctic amplification. English SPRINGER NORTHERN ALASKA CLIMATE-CHANGE COVER CHANGES SEA-ICE FOREST TEMPERATURE SENSITIVITY IMPACTS MODEL INDEX Vegetation-cloud feedbacks to future vegetation changes in the Arctic regions Article 10.1007/s00382-017-3840-5 1 CLIMATE DYNAMICS, v.50, no.9-10, pp.3745 - 3755 CLIMATE DYNAMICS 50 9-10 3745 3755 scie scopus 000429650700034 2-s2.0-85026552770 Meteorology & Atmospheric Sciences Meteorology & Atmospheric Sciences Article NORTHERN ALASKA CLIMATE-CHANGE COVER CHANGES SEA-ICE FOREST TEMPERATURE SENSITIVITY IMPACTS MODEL INDEX Arctic greening CAM3 Albedo Roughness Vegetation-cloud feedback