Sentences with phrase «ice core records such»

Not exact matches

To calculate the correlation during the Little Ice Age, researchers compared the core data with proxies for precipitation data, such as data from tree rings, cave formations and other natural records.

Most previous Antarctic ice core records have not included many of the elements and chemical species that we study, such as heavy metals and rare earth elements, that characterize the anomaly — so in many ways these other studies were blind to the Mt. Takahe event.»

Current research methods such as ice - core drilling can produce high - quality records of aerosols and soot going back centuries and even millennia, he says, and «these written accounts provide a good complement» to the data.

It is therefore important, using instrumental records and proxies (such as ice cores, or microfossils in marine sediment cores), to compare current trends with those in the past [3].

The biggest uncertainties lies in the interpretation of the radionuclide records that can be measured in natural archives such as ice cores in the case of 10Be or tree rings in the case of 14C.

1) Lack of such degassing events in the recent paleo - records, as Dr Schmidt points out this would appear in ice cores, yet the warmth of the early Holocene and the earlier Eemian and Holsteinian interglacials did not trigger a degassing.

You may now understand why global temperature, i.e. ocean heat content, shows such a strong correlation with atmospheric CO2 over the last 800,000 years — as shown in the ice core records.

No detailed assessment of the speed of change involved seems to have been made within the literature (though it should be possible to make such assessments from the ice core record), but the short duration of these events at least suggests changes that took only a few decades or less to occur.

Neither such a large increase or decrease, nor a recovery in less than a decade is seen in the d13C record: less than 0.1 per mil decrease in atmosphere (ice cores) and upper oceans (sponges) 1935 - 1950.

This work is the first to consistently recreate the event by computer modeling, and the first time that the model results have been confirmed by comparison to the climate record, which includes such things as ice core and tree ring data.

''... worked with two sediment cores they extracted from the seabed of the eastern Norwegian Sea, developing a 1000 - year proxy temperature record «based on measurements of δ18O in Neogloboquadrina pachyderma, a planktonic foraminifer that calcifies at relatively shallow depths within the Atlantic waters of the eastern Norwegian Sea during late summer,» which they compared with the temporal histories of various proxies of concomitant solar activity... This work revealed, as the seven scientists describe it, that «the lowest isotope values (highest temperatures) of the last millennium are seen ~ 1100 - 1300 A.D., during the Medieval Climate Anomaly, and again after ~ 1950 A.D.» In between these two warm intervals, of course, were the colder temperatures of the Little Ice Age, when oscillatory thermal minima occurred at the times of the Dalton, Maunder, Sporer and Wolf solar minima, such that the δ18O proxy record of near - surface water temperature was found to be «robustly and near - synchronously correlated with various proxies of solar variability spanning the last millennium,» with decade - to century - scale temperature variability of 1 to 2 °C magnitude.»

The computations show similar long - term variations with the global radionuclides production records from terrestrial archives such as tree rings and ice cores which validate the approach.

The modelled series are next compared with the records from terrestrial archives such as tree rings (Roth & Joos 2013) and ice cores (Berggren et al. 2009).

Interpretation of such proxy records of climate — for example, using tree rings to judge occurrence of droughts or gas bubbles in ice cores to study the atmosphere at the time the bubbles were trapped — is a well - established science that has grown much in recent years.

229 Time resolution on the scale of a year or two can be obtained from semi-fossil trees, e.g., Roig et al (2001) have a 1229 - year - long stretch of tree - ring widths from the middle of the last ice age at 40 ° S that shows abrupt droughts with abrupt recoveries (tenfold changes in yearly accumulation), but they are floating in absolute time and such local records can not yet be matched to events in the ice - core records.

Once the ice cores reach storage facilities, scientists digitally record the ice cores» characteristics — such as the presence of volcanic ash or the appearance of bubbles in the ice — in a controlled cold laboratory.

Instrumental climate records aren't available for dates before the mid-19th century so scientists must turn to data from «proxies» such as tree - rings, corals, and ice cores.

Looking at other records such as ice cores shows very large and sharp spikes in the Holocene that can not be squared easily with the assertion of an essentially constant temperature as given ex cathedra to us by Marcott et al..

... Also, in the Huber et al paper, we wrote that our findings support the integrity of the records of large - molecule gases such as CO2 from ice cores».

The ice core data is insensitive to an epoch of 50 to 100 years, such as that observed in the full MLO record.

1) a quasi-60 year cycle has been detected in several proxy during the last centuries and for several millennia, For example in numerous Holocene records, such as in Davis J.C., and Bohling G., The Search for Patterns in Ice - Core Temperature Curves: in Gerhard, Lee C., William E. Harrison, and Bernold M. Hanson, eds., Geological Perspectives of Global Climate Change, 213 - 230 (2001).

Note that regional proxies, such as the oxygen - isotope temperature reconstructions from the Greenland Ice Core Project that record Dansgaard - Oeschger events, often indicate faster regional rates of climate change than the overall global average for glacial - interglacial transitions, just as today warming is more pronounced in Arctic regions than in equatorial regions (Barnosky et al., 2003; Diffenbaugh and Field, 2013).

There are a host of other problems with Salby's «model», such as the ice core record, and where the warming came from in the first place, but there's no need to go into these details when the fundamental premise of Salby's argument is so clearly wrong.

To gain a longer view, Dr Jones and her colleagues used a compilation of records from natural archives such as ice cores from the Antarctic ice sheet, which show how the region's climate has changed over the last 200 years.

Quantities such as tree ring widths, coral growth, isotope variations in ice cores, ocean and lake sediments, cave deposits, fossils, ice cores, borehole temperatures, and glacier length records are correlated with climatic fluctuations.

Such as another fascinating paper by Don J. Easterbrook, Professor Emeritus in the Deptment of Geology at Western Washington University: «Solar Influence on Recurring Global, Decadal, Climate Cycles Recorded by Glacial Fluctuations, Ice Cores, Sea Surface Temperatures, and Historic Measurements Over the Past Millennium» — Hat tip to Anthony Watt's Watts Up with That.

Estimates of surface temperature changes further back in time must therefore make use of the few long available instrumental records or historical documents and natural archives or «climate proxy» indicators, such as tree rings, corals, ice cores and lake sediments, and historical documents to reconstruct patterns of past surface temperature change.

The lack of widespread instrumental climate records introduces the need for the use of natural climate archives from «proxy» data such as tree - rings, corals, speleothems and ice cores, as well as documentary evidence to reconstruct climate in past centuries (see Jones et al. 2009 for a review).