reference : Role of polar amplification in long-term surface air temperature variations and modern Arctic warming

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/reference/e1ea418d-9ff7-4869-a09e-30672e492a64
Bibliographic fields
reftype Journal Article
Abstract This study uses an extensive dataset of monthly surface air temperature (SAT) records (including previously unutilized) from high-latitude (>60°N) meteorological land stations. Most records have been updated by very recent observations (up to December 2008). Using these data, a high-latitude warming rate of 1.36°C century−1 is documented for 1875–2008—the trend is almost 2 times stronger than the Northern Hemisphere trend (0.79°C century−1), with an accelerated warming rate in the most recent decade (1.35°C decade−1). Stronger warming in high-latitude regions is a manifestation of polar amplification (PA). Changes in SAT suggest two spatial scales of PA—hemispheric and local. A new stable statistical measure of PA linking high-latitude and hemispheric temperature anomalies via a regression relationship is proposed. For 1875–2008, this measure yields PA of ∼1.62. Local PA related to the ice–albedo feedback mechanisms is autumnal and coastal, extending several hundred kilometers inland. Heat budget estimates suggest that a recent reduction of arctic ice and anomalously high SATs cannot be explained by ice–albedo feedback mechanisms alone, and the role of large-scale mechanisms of PA of global warming should not be overlooked.
Author Roman V. Bekryaev; Igor V. Polyakov; Vladimir A. Alexeev
DOI 10.1175/2010jcli3297.1
Issue 14
Journal Journal of Climate
Keywords Arctic,Temperature,Albedo,Sea ice,Radiative forcing
Pages 3888-3906
Title Role of polar amplification in long-term surface air temperature variations and modern Arctic warming
Volume 23
Year 2010
Bibliographic identifiers
.reference_type 0
_record_number 20784
_uuid e1ea418d-9ff7-4869-a09e-30672e492a64