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Local Radiative Feedbacks Over the Arctic Based on Observed Short‐Term Climate Variations
Author(s) -
Zhang Rudong,
Wang Hailong,
Fu Qiang,
Pendergrass Angeline G.,
Wang Minghuai,
Yang Yang,
Ma PoLun,
Rasch Philip J.
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl077852
Subject(s) - environmental science , albedo (alchemy) , shortwave , longwave , climatology , cloud feedback , atmospheric sciences , arctic , water vapor , cloud forcing , radiative transfer , atmosphere (unit) , cloud albedo , lapse rate , climate model , cloud cover , climate change , meteorology , climate sensitivity , cloud computing , geology , geography , physics , art history , operating system , art , oceanography , quantum mechanics , performance art , computer science
We compare various radiative feedbacks over the Arctic (60–90°N) estimated from short‐term climate variations occurring in reanalysis, satellite, and global climate model data sets using the combined Kernel‐Gregory approach. The lapse rate and surface albedo feedbacks are positive, and their magnitudes are comparable. Relative to the tropics (30°S–30°N), the lapse rate feedback is the largest contributor to Arctic amplification among all feedbacks, followed by surface albedo feedback and Planck feedback deviation from its global mean. Both shortwave and longwave water vapor feedbacks are positive, leading to a significant positive net water vapor feedback over the Arctic. The net cloud feedback has large uncertainties including its sign, which strongly depends on the data used for all‐sky and clear‐sky radiative fluxes at the top of the atmosphere, the time periods considered, and the methods used to estimate the cloud feedback.