Sentences with phrase «during glacial periods there»

Create a temperature profile for high, medium and equatorial latitudes and you can imagine that during glacial periods there is less variation between the deep and shallow layers.

During glacial periods there were others.

During the glacial period there were 26 abrupt temperature increases of about 7 - 10 degrees.

Not exact matches

Climate scientists find the last glacial period interesting because ice cores in Greenland and ocean sediment cores have shown that during this period there were sharp shifts in global temperatures.

«Although this period is around the late glacial maximum, there is a blip at 23,000 years during which time it was milder.»

It seems that after the climate cooled during the last glacial period, disappearing habitat inland forced brown bears toward the coasts, where they encountered polar bears shifted there by British - Irish ice sheets.

During the history of Earth, there have been a series of periods in which a significant portion of the hydrosphere was locked up in the form of glacial ice.

During the last part of the Pleistocene there were actually five major periods of glaciation with four periods of warmer non glacial conditions between them.

What Bond showed is that there are quasi-cycles that Bond argued have the same cause as the ones during the glacial period.

It seems increasingly clear that D - O events must involve major sea ice changes (and there is not much sea ice left, by comparison with what was present during the glacial period (20000 + years ago, when these events happened), so D - O events are increasingly unlikely in the future).

Global average temperature is lower during glacial periods for two primary reasons: 1) there was only about 190 ppm CO2 in the atmosphere, and other major greenhouse gases (CH4 and N2O) were also lower 2) the earth surface was more reflective, due to the presence of lots of ice and snow on land, and lots more sea ice than today (that is, the albedo was higher).

There is no doubt that the temperature accuracy and many of the forcing accuracies during the instrumental period are much better than temperature and forcing reconstructions of the Last Glacial Maximum.

If there was actually glaciation during cold periods, glacial dust might well have blown out to sea, fertilizing large areas and producing a stronger CO2 pump.

However, there have been other studies in both the Swiss and Austrian alps (e.g. Schlüchter, Patzelt), which have found carbon - dated remains of trees under receding glaciers, supporting the conclusion that the glacial extent during the Roman Warm Period and the MWP (as well as during earlier warm periods) was less than today.

As there is a lot of talk of the see - saw mechanism (in decadal - centurial scale) during the glacial terminations, might this effect be noticeable also in shorter periods of time?

Well drained and rocky substrate there creates a glade ecosystem where sloping ground can encourage the growth of prickly pear cacti and other desert and prairie species such as the collared lizard, Crotaphytus that last covered the whole area around 7,000 years ago in the Hypsithermal Interval, during the Holocene Period, when warming dried out much of the glacial Northern Hemisphere.

I think there must be at least two factors interacting to achieve the necessary switches so that they offset one another to minimise climate variability during interglacials but supplement one another to increase climate variability during glacial periods.

1998 was near the tail end of a decade that jumped well above the mean average longer term rate of increase (there is a thing called climate variability, it didn't disappear with climate change, and if anything probably only intensified;, and ocean warming and glacial melt both accelerated during this period, taking more energy out of the air — see below).