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On the Origin of Multi-decadal to Centennial Greenland Temperature Anomalies Over the Past 800 Yr : Volume 8, Issue 6 (08/11/2012)

By Kobashi, T.

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Book Id: WPLBN0003974977
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: On the Origin of Multi-decadal to Centennial Greenland Temperature Anomalies Over the Past 800 Yr : Volume 8, Issue 6 (08/11/2012)  
Author: Kobashi, T.
Volume: Vol. 8, Issue 6
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Kawamura, K., Box, J. E., Kodera, K., Shindell, D. T., Nakaegawa, T., & Kobashi, T. (2012). On the Origin of Multi-decadal to Centennial Greenland Temperature Anomalies Over the Past 800 Yr : Volume 8, Issue 6 (08/11/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: National Institute of Polar Research, 10-3 Midoricho, Tachikawa, Tokyo, 190-8518, Japan. The surface temperature of the Greenland ice sheet is among the most important climate variables for assessing how climate change may impact human societies associated with accelerating sea level rise. However, the causes of multi-decadal-to-centennial temperature changes in Greenland are not well understood, largely owing to short observational records. To examine the causes of the Greenland temperature variability, we calculated the Greenland temperature anomalies (GTA(G-NH)) over the past 800 yr by subtracting the standardised NH temperature from the standardised Greenland temperature. It decomposes the Greenland temperature variation into background climate (NH); Polar amplification; and Regional variability (GTA(G-NH)). The Central Greenland polar amplification factor as expressed by the variance ratio = Greenland/NH is 2.6 over the past 161 yr, and 3.3–4.2 over the past 800 yr. The GTA explains 31–35% of the variation of Greenland temperature in the multi-decadal-to-centennial time scale over the past 800 yr. Another orthogonal component of the Greenland and NH temperatures, GTP(G+NH) (Greenland temperature plus = standardized Greenland temperature + standardized NH temperature) exhibited the multi-decadal variations that were likely induced by large volcanic eruptions, increasing greenhouse gasses, and internal variation of climate. We found that the GTA(G-NH) has been influenced by solar-induced changes in atmospheric circulation patterns such as those produced by North Atlantic Oscillation/Arctic Oscillation (NAO/AO). Climate modelling indicates that the anomaly is also likely linked to solar-paced changes in the Atlantic meridional overturning circulation (AMOC) and to associated changes in northward oceanic heat transport.

Summary
On the origin of multi-decadal to centennial Greenland temperature anomalies over the past 800 yr

Excerpt
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