Sentences with phrase «glacial records»

The relative warmth of the climate around 1640 to 1660 approximately that I had expressed some scepticism about appears to be vindicated by glacial records.

I've sometimes thought that global cataclysms like the largest volcanic eruptions would disrupt the glacial records by many years, like Oruanui eruption c. 26500bp, as these would induce unrecorded behavior in weather and other things, f.e. the huge ash deposits might decrease the albedo so much a local melting event happens.

While this is controversial, in any case there must be some sort of feedback from temperature to atmospheric carbon to account for certain aspects of the glacial record.

Emphasize that we are now matching the warmest climate seen in the glacial record.

In particular, there are «slow» responses to the imbalance that are seen in the glacial record — CO2 and methane increase with a slow lag as temperature rises in response to the orbital changes, and the albedo effect that reduces incoming sunlight decreases as the ice melts, also with a slow lag.

If one looks at the full glacial record, every retreat and collapse of ice sheets are preceded by ever increasing dust accumulations.

Figure 103 in Hubert Lamb's «Climate History and the Modern World» shows an estimate of the growing season near the upper limit of cultivation in Scotland which mirrors much of the glacial record and demonstrates a steady - but not constant - improvement after a modest peak in the mid 1550's - from the trough of the early 1600's to the present day.

Is the temperature chronology of the ice cores and global proxies consistent with the well - dated, global glacial record?

I would like to remind you that the 100ppm CO2 rises (smoothed over multi-century samples) in the glacial record took 5 - 10K years, I'm not sure what you are suggesting might have really happened, certainly not that our 100ppm in 1.5 century jump is not unusual.

Not exact matches

Human history is in grand cycles parallel to glacial floods starting in about 63000 BC from which Puranic records are available.

The comptroller also hit the mayor over what he claimed was the glacial pace of the recording devices» arrival in New York City.

Reconstructing past climate records can help scientists determine both natural patterns and the ways in which future glacial events and greenhouse gas emissions may affect global systems.

Instead, the fossil record indicates they vanished during the Earth's glacial - interglacial transition, which occurred about 12,000 years ago and led to much warmer conditions and the start of the current Holocene period.

Previous ocean sediment records suggest that, as the world slipped into the last glacial period, less carbon overall reached the sediments of the Southern Ocean, coinciding with declining atmospheric carbon dioxide.

Now, using two deep cores collected at two Ocean Drilling Program sites in the Southern Ocean, Jaccard and colleagues have reconstructed ocean records of productivity and vertical overturning reaching back a million years, through multiple glacial - interglacial cycles.

But for the other half of the picture — what happened in the oceans during that time — there is only a relatively short record extending back about 20,000 years to the last glacial cycle.

This record is to date the most comprehensive terrestrial archive from the Arabian Peninsula, and provides evidence for multiple humid episodes during both glacial and interglacial periods.

Record high temperatures in Pakistan's far north were already producing higher amounts of snowmelt and glacial meltwater runoff from the Karakoram Range and into the Indus River System.

The concentrations of dissolved phosphate the researchers found in the Leverett Glacier meltwater — which is just one form of phosphorus found in the meltwater — were similar to concentrations found in Arctic rivers, and among the highest levels recorded in glacial meltwaters worldwide.

Indeed, in another paper in the same issue of Science, Goran Ekstrom of Harvard University reported a marked increase in so - called glacial earthquakes (seismic events recorded throughout the world when Greenland's glaciers slip past rock) since 2002.

According to climate records stretching back a century, southern Greenland has warmed three degrees Celsius in just the past 20 years, driving melting that may help lubricate glacial flow along the bedrock, the two speculate.

«This record, which spans the entire last glacial period, adds significantly to the understanding of how various climate forcings are felt by the western tropical Pacific,» Carolin added.

Complementary analyses of the surface mass balance of Greenland (Tedesco et al, 2011) also show that 2010 was a record year for melt area extent... Extrapolating these melt rates forward to 2050, «the cumulative loss could raise sea level by 15 cm by 2050 ″ for a total of 32 cm (adding in 8 cm from glacial ice caps and 9 cm from thermal expansion)- a number very close to the best estimate of Vermeer & Rahmstorf (2009), derived by linking the observed rate of sea level rise to the observed warming.

Ice core records are rich archives of the climate history during glacial - interglacial cycles over timescales of up to ~ 800 kyr before the current age.

Here we present the first dated terrestrial record from southeast Arabia that provides evidence for increased rainfall and the expansion of vegetation during both glacial and interglacial periods.

The MIS 5a palaeosol is overlain by massive sands, representing a major change in the depositional regime, which we interpret as evidence for climatic desiccation at the start of the last glacial period (MIS 4), which would be consistent with other dated records for the region [13], [16], [18], [30].

Readers can look for themselves at the Greenland ice core record and decide whether there's anything of consequence going on around 41K before present that looks any different from other glacial - interglacial cycles.You can look at the GISP data yourself by downloading

Methane changes much more quickly than CO2 in the ice core records, through the Younger Dryas for example, which lasted 1000 years, methane goes back to glacial values while CO2 sort of hovers in place.

Having briefly glanced at it, his main argument seems to come from overlaying the CO2 records at the same stage of different glacial cycles, and that seems quite hard to do, to me — William]

Glacial retreat patterns and processes determined from integrated sedimentology and geomorphology records.

We recently extended this record to approximately 120,000 years BP in order to track vegetation change over a full glacial cycle at millennial to orbital timescales.

Konfal, S., Wilson, T., Bevis, M., Kendrick, E., Hall, B. «Glacial isostatic crustal uplift in southern Victoria Land, Antarctica, from geologic and geodetic records.»

The volcanic rocks are dateable, and the sequence provides an excellent record of glacial activity [1].

«Palaeoshoreline records of glacial isostatic adjustment in the Dry Valleys region, Antarctica.»

Pope, P.G. and Anderson, J.B., 1992, Late Quaternary glacial history of the northern Antarctic Peninsula's western continental shelf: Evidence from the marine record, in Elliot, D.H. ed., Contributions to Antarctic Research III, Antarctic Research Series, Volume 57, American Geophysical Union, Washington, D.C., p. 63 - 91.

As ice from the last glacial period retreated, plants, animals and people left behind a detailed record of their environment.

Episodic retreat is recorded by mega-scale glacial lineations that are overprinted by transverse grounding - zone wedges, each recording a pause in ice stream retreat with a stationary grounding line.

The project collects waveforms of seismic phases travelling through Earth and records instances of glacial earthquakes.

Ice core records show that atmospheric CO2 varied in the range of 180 to 300 ppm over the glacial - interglacial cycles of the last 650 kyr (Figure 6.3; Petit et al., 1999; Siegenthaler et al., 2005a).

Marine sediment cores will reveal records of past glacial - interglacial cycles while lake sediments and peat cores will reveal climate records since the last ice age.

While Milankovitch forcing predicts that cyclic changes in the Earth's orbital parameters can be expressed in the glaciation record, additional explanations are necessary to explain which cycles are observed to be most important in the timing of glacial — interglacial periods.

Here we show that the East Greenland Ice Sheet existed over the past 7.5 million years, as indicated by beryllium and aluminum isotopes (10Be and 26Al) in quartz sand removed by deep, ongoing glacial erosion on land and deposited offshore in the marine sedimentary record.

An ultra-high resolution continuous record of methane variations during the last glacial - interglacial transition from the WAIS Divide ice core.

Triple water.isotopologue record from WAIS Divide, Antarctica: controls on glacial - interglacial changes in 17Oexcess of precipitation.

The archaeological record suggested that very roughly 150,000 individuals spanned Europe and Asia, living in small groups of 15 to 25 — and that their total numbers fluctuated greatly during the several climate cycles (which included harsh glacial periods) that occurred during the half a million years they inhabited Earth, before going extinct 40,000 years ago.

Glacial, but unexpectedly funny in spots, the latest from the reigning king of «style for style's sake» is a cautionary tale about beauty and the fashion industry in which everyone looks like a vampire and every scene sounds like it was recorded in a mausoleum.

Expanding on the exhibition's ongoing performative components, the gallery space will be populated by painted human bodies performing «glacial» movements that will create tableuxs across new architectural and sculptural works and be accompanied by new sound recordings.

Methane changes much more quickly than CO2 in the ice core records, through the Younger Dryas for example, which lasted 1000 years, methane goes back to glacial values while CO2 sort of hovers in place.

[Response: Given your extensive reading of the blog, you surely can't be unaware that I have consistently stated that the best constraints on sensitivity come from the paleo record - and most importantly the last glacial period.

Having briefly glanced at it, his main argument seems to come from overlaying the CO2 records at the same stage of different glacial cycles, and that seems quite hard to do, to me — William]