reference : A decomposition of feedback contributions to polar warming amplification

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/reference/74b2ec95-20d0-4af6-8f4c-08f7a0ae8981
Bibliographic fields
reftype Journal Article
Abstract Polar surface temperatures are expected to warm 2–3 times faster than the global-mean surface temperature: a phenomenon referred to as polar warming amplification. Therefore, understanding the individual process contributions to the polar warming is critical to understanding global climate sensitivity. The Coupled Feedback Response Analysis Method (CFRAM) is applied to decompose the annual- and zonal-mean vertical temperature response within a transient 1% yr−1 CO2 increase simulation of the NCAR Community Climate System Model, version 4 (CCSM4), into individual radiative and nonradiative climate feedback process contributions. The total transient annual-mean polar warming amplification (amplification factor) at the time of CO2 doubling is +2.12 (2.3) and +0.94 K (1.6) in the Northern and Southern Hemisphere, respectively. Surface albedo feedback is the largest contributor to the annual-mean polar warming amplification accounting for +1.82 and +1.04 K in the Northern and Southern Hemisphere, respectively. Net cloud feedback is found to be the second largest contributor to polar warming amplification (about +0.38 K in both hemispheres) and is driven by the enhanced downward longwave radiation to the surface resulting from increases in low polar water cloud. The external forcing and atmospheric dynamic transport also contribute positively to polar warming amplification: +0.29 and +0.32 K, respectively. Water vapor feedback contributes negatively to polar warming amplification because its induced surface warming is stronger in low latitudes. Ocean heat transport storage and surface turbulent flux feedbacks also contribute negatively to polar warming amplification. Ocean heat transport and storage terms play an important role in reducing the warming over the Southern Ocean and Northern Atlantic Ocean.
Author Patrick C. Taylor; Ming Cai; Aixue Hu; Jerry Meehl; Warren Washington; Guang J. Zhang
DOI 10.1175/JCLI-D-12-00696.1
Issue 18
Journal Journal of Climate
Keywords Climate change,Climate sensitivity,Feedback,Forcing
Pages 7023-7043
Title A decomposition of feedback contributions to polar warming amplification
Volume 26
Year 2013
Bibliographic identifiers
.reference_type 0
_record_number 19883
_uuid 74b2ec95-20d0-4af6-8f4c-08f7a0ae8981