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

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2018GL077852· OSTI ID:1452661
 [1];  [2];  [3];  [4];  [5];  [2];  [2];  [2]
  1. Institute for Climate and Global Change Research and School of Atmospheric Sciences Nanjing University Nanjing China, Jiangsu Provincial Collaborative Innovation Center of Climate Change Nanjing China, Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory Richland WA USA
  2. Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory Richland WA USA
  3. Department of Atmospheric Sciences University of Washington Seattle WA USA
  4. National Center for Atmospheric Research Boulder CO USA
  5. Institute for Climate and Global Change Research and School of Atmospheric Sciences Nanjing University Nanjing China, Jiangsu Provincial Collaborative Innovation Center of Climate Change Nanjing China
Abstract

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.

Sponsoring Organization:
USDOE
OSTI ID:
1452661
Alternate ID(s):
OSTI ID: 1578082
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 11 Vol. 45; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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