Sentences with phrase «from paleoclimate records»

Efforts to estimate climate sensitivity from paleoclimate records... face the additional challenge of a proxy record that contains major uncertainty.

Verdon, D. C., and S. W. Franks (2006), Long - term behaviour of ENSO: Interactions with the PDO over the past 400 years inferred from paleoclimate records, Geophys.

Long - term behaviour of ENSO: Interactions with the PDO over the past 400 years inferred from paleoclimate records (Verdon and Franks, 2006)

Verdon, D. C., Franks, S. W., 2006, Long - term behaviour of ENSO: Interactions with the PDO over the past 400 years inferred from paleoclimate records, Geophysical Research Letters, Volume 33, Issue 6, March 2006, DOI: 10.1029 / 2005GL025052

Stefan is not saying «we don't learn anything from paleoclimate records».

temperature could have exacerbated the 2014 drought by approximately 36 %... These observations from the paleoclimate record suggest that high temperatures have combined with the low but not yet exceptional precipitation deficits to create the worst short - term drought of the last millennium for the state of California... Future severe droughts are expected to be in part driven by anthropogenic influences and temperatures outside the range of the last millennium.

Our understanding of ENSO and its connection to background climatic conditions comes largely from the paleoclimate record and model simulations.

Not exact matches

Carmala Garzione, a professor of earth and environmental sciences at the University of Rochester, and Junsheng Nie, a visiting research associate at the University, surveyed sediment samples from the northern Tibetan Plateau's Qaidam Basin and were able to construct paleoclimate cycle records from the late Miocene epoch of Earth's history, which lasted from approximately 11 to 5.3 million years ago.

«Most of the paleoclimate records from this region are plant - based, and track only the warm part of the year — the growing season,» says Candace Major, program director in NSF's Directorate for Geosciences, which funded the research.

The paleoclimate data, which included mainly changes in the oxygen isotopes of the calcium carbonate deposits, were then compared to similar records from other caves, ice cores, and sediment records as well as model predictions for water availability in the Middle East and west central Asia today and into the future.

Paleoclimate: I don't know for sure, but this record is too long (1 million years) to be an ice core, so I'm guessing it's a stacked sediment core, showing delta - O18 from ocean foraminifera.

Paleoclimate derived from stacked benthic foraminifera δ18O or aeolian dust records has been unable explain the occurrence of discrete evolutionary phases in the hominin fossil record [2]--[3], [15], the incorporation of the Rift lakes as both a climate indicator and landscape feature provides this missing environmental evidence.

Here we use a comprehensive set of paleoclimate indicators: East African Rift lake presence, regional Aeolian flux records from the Arabian Sea, the Mediterranean and the East Atlantic together global benthic foraminifera δ18O with to develop models predicting hominin brain size.

Oerlemans's reconstruction of global temperatures (largely from mid latitude glaciers) is entirely independent of the much talked about temperature records from other paleoclimate proxy data (e.g. Moberg and others, Mann and others, Crowley and others).

In terms of the comments about the Holocene record, etc, and Gavin's saying that there is «no evidence» of such methane burps then: first, let us all also acknowledge that some of the world's major paleoclimate and methane experts HAVE seen evidence of exactly that [i.e., Nisbet, Have sudden large releases of methane from geological reservoirs occurred since the Last Glacial Maximum, and could such releases occur again?

In fact, Marohasy points out that a lack of rising temperatures for recent decades is so common in paleoclimate reconstructions that tendentious climate scientists have necessarily added heavily adjusted, hockey - stick - shaped instrumental records (e.g., from NASA GISS, HadCRUT) on to the end of the trend so as to maintain the visualization of an ongoing dangerous warming.

When I hear this criticism of the paleoclimate record, namely that we have only indirect knowledge of it, which the «tool man» contrasts with the knowledge we gain of trends by means of satellites, I am reminded that all knowledge is from one perspective or another, indirect.

«The paleoclimate record shouts out to us that, far from being self - stabilising, the Earth's climate system is an ornery beast which overreacts to even small nudges.»

Previous large natural oscillations are important to examine: however, 1) our data isn't as good with regards to external forcings or to historical temperatures, making attribution more difficult, 2) to the extent that we have solar and volcanic data, and paleoclimate temperature records, they are indeed fairly consistent with each other within their respective uncertainties, and 3) most mechanisms of internal variability would have different fingerprints: eg, shifting of warmth from the oceans to the atmosphere (but we see warming in both), or simultaneous warming of the troposphere and stratosphere, or shifts in global temperature associated with major ocean current shifts which for the most part haven't been seen.

Stalagmite DP1, a speleothem 1.6 m in length from Dante Cave in northeastern Namibia, provides a paleoclimate record of a gradual transition from wetter to drier conditions from 4.6 to 3.3 ka BP [before present], a variable but pronounced dry period from 3.3 to 1.8 ka, and a wetter but variable period from 1.8 ka to the present.

The information derives in part from paleoclimate data, the record of how climate changed in the past, as well as from measurements being made now by satellites and in the field.

22 This study includes 73 records derived from multiple paleoclimate archives and 23 temperature proxies (Fig.

Paleoclimate records from ice cores, marine sediment cores, and speleothems (stalagmites and stalactites) have demonstrated that abrupt Northern Hemisphere cooling and Southern Hemisphere warming occurred in response to Heinrich events.

Verdon and Franks (2006)-- for instance — used «proxy climate records derived from paleoclimate data to investigate the long - term behaviour of the PDO and ENSO.

However, the separation of char from soot has rarely been applied in paleoclimate studies using sediment analysis, much less in investigations of long - term records of paleo - fires.

Also, like you say, in his inexorable quest to remove any hockey stick shape whatsoever from the historical paleoclimate record, McIntyre insisted on using only PC1 — even though MBH98's short - centred PCA methodology required that all significant principle components were captured.

Results from relatively short simulations should, therefore, be interpreted with caution when comparing to the paleoclimate record.

From a combination of climate models, satellite data, and paleoclimate records the scientists conclude that the West Antarctic ice sheet, Arctic ice cover, and regions providing fresh water sources and species habitat are under threat from continued global warmFrom a combination of climate models, satellite data, and paleoclimate records the scientists conclude that the West Antarctic ice sheet, Arctic ice cover, and regions providing fresh water sources and species habitat are under threat from continued global warmfrom continued global warming.

Composed of 450 instrumental records from temperature stations sheltered from ocean - air / urbanization / adjustment biases throughout the world, a new 20th / 21st century global temperature record introduced previously here very closely aligns with paleoclimate evidence from tree rings, ice cores, fossil pollen and other temperature proxies.

From a combination of climate models, satellite data, and paleoclimate records, Hansen and co-author Makiko Sato of Columbia's Earth Institute, conclude that the West Antarctic ice sheet, Arctic ice cover, and regions providing fresh water sources and species habitat are threatened from continued global warmFrom a combination of climate models, satellite data, and paleoclimate records, Hansen and co-author Makiko Sato of Columbia's Earth Institute, conclude that the West Antarctic ice sheet, Arctic ice cover, and regions providing fresh water sources and species habitat are threatened from continued global warmfrom continued global warming.

We had no «globally and annually averaged land and sea surface temperature» indicator back in medieval times, so we have to rely on the information we can get from historical records and paleoclimate studies.

And by the way, I am not aware of any event in the Paleoclimate record where CO2 in the atmosphere rises this much this fast although, to be fair, paleoclimate data from the distant past often lacks the fine resolution required for such a dePaleoclimate record where CO2 in the atmosphere rises this much this fast although, to be fair, paleoclimate data from the distant past often lacks the fine resolution required for such a depaleoclimate data from the distant past often lacks the fine resolution required for such a demonstration.

A similar negative trend is seen in most other Holocene paleoclimate records from northern Sweden, e.g. changes in tree - limit (Karlén 1976; Kullman 1995); pollen (Barnekow 1999); chironomids (Larocque and Bigler 2004); oxygen - isotopes in lacustrine biogenic silica (Shemesh et al. 2001) and in lacustrine carbonates (Hammarlund et al. 2002).

Based on the paleoclimate record from ice and ocean cores, the last warm period in the Arctic peaked about 8,000 years ago, during the so - called Holocene Thermal Maximum.

Comprised of 450 instrumental records from temperature stations sheltered from ocean - air / urbanization / adjustment biases throughout the world, a new 20th / 21st century global temperature record introduced previously here very closely aligns with paleoclimate evidence from tree rings, ice cores, fossil pollen and other temperature proxies.

Our ability to place the recent temperature increase in a longer paleoclimate perspective is also hampered by an apparent change in the sensitivity of recent tree - growth to temperature at high northern latitudes where trends in TRW and MXD have been reported to increasingly diverge from the instrumental records during the second half of the twentieth century (Jacoby and D'Arrigo 1995; Briffa et al. 1998a, b; D'Arrigo et al. 2007).

Paleoclimate: I don't know for sure, but this record is too long (1 million years) to be an ice core, so I'm guessing it's a stacked sediment core, showing delta - O18 from ocean foraminifera.

7) How central is the debate over the paleoclimate temperature record to the overall scientific consensus on global climate change (as reflected in previous reports from the Academy)?

But a recent study published in Nature uses paleoclimate records from the 1500s to show that industrial - era warming first became apparent in the Northern Hemisphere in the mid-1800s.