Global Warming Induced by CO2 and the Okhotsk Sea.
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概要
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A numerical experiment examining the transient response of climate to a gradual increase in atmospheric CO<SUB>2</SUB> concentration at a compound annual rate of 1% has been performed with a coupled atmosphere-ocean general circulation model (CGCM) developed at the Meteorological Research Institute (MRI).<BR>Time integration has been performed up to 70 years in the future over which time the CO<SUB>2</SUB> concentration doubles. This report focuses on the transient climate response at high latitudes in the Northern Hemisphere, especially on the warming over the Okhotsk Sea.<BR>The maximum warming did not occur until the last decade of the 70 year integration near the north pole. This fact and correlation among temporal changes in surface energy fluxes suggests that the negative feedback of lead strongly affects the response in the polar region. Although the sea ice and snow/ice-albedo feedback dominates the CO<SUB>2</SUB> -induced warming at high latitudes of the Northern Hemisphere, the warming at the southern boundary of sea ice formation is, to some extent, affected by stationary planetary waves in winter, taking a form of zonal wave-number 3 in the decadal time mean. The location of maximum warming at the southern boundaries of the polar region, i.e., the Okhotsk Sea, the Barents Sea and the Hudson Bay, almost agrees with the troughs of the waves. This fact may be applied to detect a CO<SUB>2</SUB>-induced climate-change signal in the real climate system by referring to observed stationary planetary waves, especially to the troughs, in winter. Thus a long term monitoring of the sea ice over there by satellites using remote sensing techniques will provide a strong basis for the detection of the global warming.
- 社団法人 日本リモートセンシング学会の論文