Para quien tenga un rato, interesante ir recorriendo los abstrats a presentar en el próximo congreso de la AGU:
http://agu-fm10.abstractcentral.com/plannerDejo como ejemplo esto de nuestros amigos del NSIDC:
Sea ice response to an extreme negative phase of the Arctic Oscillation during winter 2009/2010
J. C. Stroeve1; J. A. Maslanik2; M. C. Serreze1; I. G. Rigor3; W. Meier1
1. NSIDC, University of Colorado, Boulder, CO, United States.
2. Colorado Center for Astrodynamics Research, University of Colorado, Boulder, CO, United States.
3. Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA, United States.
An extreme negative phase of the Arctic Oscillation (AO) characterized winter 2009/2010, leading to a strong Beaufort Gyre, a weak Transpolar Drift Stream (TDS), and near normal ice flow out of Fram Strait. In term of impacts on ice transport, autumn and winter of 2009/2010 saw above-average ice transport from north of the Canadian Archipelago westward into the eastern Beaufort and western Chukchi seas (Figure 1). Ice originating from this location is some of the oldest and thickest in the Arctic.
Typically, ice that forms within, or drifts into, the Beaufort Gyre may circulate within the Canada Basin for several years, becoming thicker with time. Eventually, the thick ice enters the TDS and exits the Arctic through Fram Strait.
A stronger Beaufort Gyre, as tends to accompany the negative phase of the AO, should therefore foster the development of older, thicker ice that survives summer melt, meaning more ice in September. However, a key aspect of the 2009/2010 winter transport pattern is that the winds drove the older ice directly across the Beaufort into the Chukchi Sea, as opposed to curving northward in the western Beaufort.Heading into the 2010 melt season we then had the situation where more MYI was present in the Chukchi and southern Beaufort seas than in recent years. A priori, this thicker ice should have had a better chance of surviving summer melt and thus replenished the overall MYI extent. However,by the end of August, most of the old ice transported into these regions had disappeared, further depleting the Arctic's store of old, thick ice.
8207 Respuestas
3416055 Vistas