Local Radiative Feedbacks Over the Arctic Based on Observed Short-Term Climate Variations

TitleLocal Radiative Feedbacks Over the Arctic Based on Observed Short-Term Climate Variations
Publication TypeJournal Article
Year of Publication2018
AuthorsZhang, Rudong, Wang Hailong, Fu Qiang, Pendergrass Angeline G., Wang Minghuai, Yang Yang, Ma Po-Lun, and Rasch Philip J.
JournalGeophysical Research Letters
Volume45
Number11
Pages5761-5770
Date Published08/2018
Abstract / Summary

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.

URLhttp://dx.doi.org/10.1029/2018gl077852
DOI10.1029/2018gl077852
Journal: Geophysical Research Letters
Year of Publication: 2018
Volume: 45
Number: 11
Pages: 5761-5770
Date Published: 08/2018

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.

DOI: 10.1029/2018gl077852
Citation:
Zhang, R, H Wang, Q Fu, A Pendergrass, M Wang, Y Yang, P Ma, and P Rasch.  2018.  "Local Radiative Feedbacks Over the Arctic Based on Observed Short-Term Climate Variations."  Geophysical Research Letters 45(11): 5761-5770.  https://doi.org/10.1029/2018gl077852.