Three of the four climate models used produce increasing damage with time, with the global
warming signal emerging on time scales of 40, 113, and 170 yr, respectively.
The short answer is that nobody reading this post today will likely be around when (if)
the warming signal emerges!
Not exact matches
For the first, Geert Jan van Oldenborgh of the Royal Netherlands Meteorological Institute (KNMI) used a statistical analysis of historic rainfall observations that looked at how the frequency of such an event has changed from the past, before a
warming signal clearly
emerged, to the present.
«This
signal of
warming emerged above the noise of background variability during the 20th century for most parts of the globe.
This is because part of the outgoing radiation
signal (albeit small) is
emerging from relatively
warm layers aloft, and thus slightly less emission is demanded from the troposphere in order to satisfy planetary energy balance.
The
warming signal, by contrast,
emerges from a much larger data set and accordingly offers much greater statistical significance.
While many studies of the effects of global
warming on hurricanes predict an increase in various metrics of Atlantic basin - wide activity, it is less clear that this
signal will
emerge from background noise in measures of hurricane damage, which depend largely on rare, high - intensity landfalling events and are thus highly volatile compared to basin - wide storm metrics.
While rainfall in the region is consistent with the
emerging El Niño, the unprecedented amounts suggest a possible climate change
signal, where a
warming atmosphere becomes more saturated with water vapor and capable of previously unimagined downpours.
«Ben Santer [federal climatologist] just published a pal - reviewed paper in the Proceedings of the National Academy of Science loudly proclaiming that the dreaded man - made global
warming signal has
emerged from our naturally chaotic climate... pretty much what he wrote in Naturefor the UN's 1996 edition of this conference, 16 years ago.
There are, however, caveats: (1) multidecadal fluctuations in Arctic — subarctic climate and sea ice appear most pronounced in the Atlantic sector, such that the pan-Arctic
signal may be substantially smaller [e.g., Polyakov et al., 2003; Mahajan et al., 2011]; (2) the sea - ice records synthesized here represent primarily the cold season (winter — spring), whereas the satellite record clearly shows losses primarily in summer, suggesting that other processes and feedback are important; (3) observations show that while recent sea - ice losses in winter are most pronounced in the Greenland and Barents Seas, the largest reductions in summer are remote from the Atlantic, e.g., Beaufort, Chukchi, and Siberian seas (National Snow and Ice Data Center, 2012, http://nsidc.org/Arcticseaicenews/); and (4) the recent reductions in sea ice should not be considered merely the latest in a sequence of AMOrelated multidecadal fluctuations but rather the first one to be superposed upon an anthropogenic GHG
warming background
signal that is
emerging strongly in the Arctic [Kaufmann et al., 2009; Serreze et al., 2009].
Meh, since he said «We also show that a local
warming signal that exceeds past natural variability is
emerging at present, or will likely
emerge in the next two decades, in many tropical countries», he has honestly said nothing.
We also show that a local
warming signal that exceeds past variability is
emerging at present, or will likely
emerge in the next two decades, in many tropical countries.
The researchers cautioned that this extreme event provides a glimpse into the region's future as greenhouse gases continue to increase, and the
signal of a
warming climate, even at this regional scale, begins to
emerge more clearly from natural variability in coming decades.