Sentences with phrase «global paleoclimate»
A Global Paleoclimate Observing System.
http://www.geo.umass.edu/
Disappearing evidence: the need for a Global Paleoclimate Observing System.
This, plus the fact that remarkable close simulations of the time series are obtained with a model consisting of a few nonlinear differential equations suggest the intriguing possibility that there are simple rules governing the complex behavior of global paleoclimate.»
They have proved that TEX86 in Lake Tanganyika is teleconnected to global temperature without realizing it and thus this single proxy can be used to reconstruct global paleoclimate, similar to, and perhaps more robust in this teleconnection, to the Graybill Bristlecones.
Our approach is a significant advance on previous models, as we incorporate the lake index as a proxy for local climate, together with regional and global paleoclimate records.
Not exact matches
So if you could then bring all these together — parts per millions, the global forcing and sea - level rise — based on the paleoclimate record, which is, kind of, the really more a recent data that the new view is built on.
These and other paleoclimate records indicate that rain belts shifted northward along with the thermal equator because of the global heat imbalance.
«Paleoclimate researchers find connection between carbon cycles, climate trends: Carbon cycling research can help scientists predict global warming and cooling trends.»
The committee has prepared a report that, in my view, provides policy makers and the scientific community with a critical view of surface temperature reconstructions and how they are evolving over time, as well as a good sense of how important our understanding of the paleoclimate temperature record is within the overall state of scientific knowledge on global climate change.
The NRC asked the committee to summarize current scientific information on the temperature record for the past two millennia, describe the main areas of uncertainty and how significant they are, describe the principal methodologies used and any problems with these approaches, and explain how central is the debate over the paleoclimate temperature record to the state of scientific knowledge on global climate change.
Other features of the record are also redated, such as the East African megadroughts (24), which must have terminated at least 10 ka earlier than the previous estimate of 75 ka B.P. Clearly, existing comparisons of the Lake Malawi paleoclimate data to other regional and global records (24, 25, 32) will need to be revised in the light of these findings.
What paleoclimate and oceanography researchers know of the mechanisms underlying such a climate «flip» suggests that global warming could start one in several different ways.
This is being actively investigated for the current human - caused global warming scenario with models and paleoclimate data.
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.
Early human evolution is characterised by pulsed speciation and dispersal events that can not be explained fully by global or continental paleoclimate records.
Human evolution is characterised by speciation, extinction and dispersal events that can not currently be explained by global or regional paleoclimate records [1]--[3].
Mike Wallace's talk was about the «National Research Council Report on the «Hockey Stick Controversy»... The charge to the committee, was «to summarize current information on the temperature records for the past millennium, describe the main areas of uncertainty and how significant they are, describe the principal methodologies used and any problems with these approaches, and explain how central is the debate over the paleoclimate record within the overall state of knowledge on global climate change.»
We use Earth's measured energy imbalance, paleoclimate data, and simple representations of the global carbon cycle and temperature to define emission reductions needed to stabilize climate and avoid potentially disastrous impacts on today's young people, future generations, and nature.
Paleoclimate data reveal instances of rapid global warming, as much as 5 — 6 °C, as a sudden additional warming spike during a longer period of gradual warming [see Text S1].
In contrast, chemistry modeling and paleoclimate records [222] show that trace gases increase with global warming, making it unlikely that overall atmospheric CH4 will decrease even if a decrease is achieved in anthropogenic CH4 sources.
We then examine climate impacts during the past few decades of global warming and in paleoclimate records including the Eemian period, concluding that there are already clear indications of undesirable impacts at the current level of warming and that 2 °C warming would have major deleterious consequences.
It's a long paper with a long title: «Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 oC global warming could be dangerous».
«Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2o C global warming could be dangerous»
We assess climate impacts of global warming using ongoing observations and paleoclimate data.
Paleoclimate data indicate that slow feedbacks would substantially amplify the 2 °C global warming.
Paleoclimate characteristics and trends provide the overarching framework and climate history to better understand centennial temperature fluctuations and potential future global temperature tipping points.
The full title is: «Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 o C global warming could be dangerous ``.
Although some earlier work along similar lines had been done by other paleoclimate researchers (Ed Cook, Phil Jones, Keith Briffa, Ray Bradley, Malcolm Hughes, and Henry Diaz being just a few examples), before Mike, no one had seriously attempted to use all the available paleoclimate data together, to try to reconstruct the global patterns of climate back in time before the start of direct instrumental observations of climate, or to estimate the underlying statistical uncertainties in reconstructing past temperature changes.
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).
On July 23, I wrote about the rocky rollout, prior to peer review, of «Ice Melt, Sea Level Rise and Superstorms: Evidence from Paleoclimate Data, Climate Modeling, and Modern Observations that 2 °C Global Warming is Highly Dangerous.»
Summary for Policymakers Chapter 1: Introduction Chapter 2: Observations: Atmosphere and Surface Chapter 3: Observations: Ocean Chapter 4: Observations: Cryosphere Chapter 5: Information from Paleoclimate Archives Chapter 6: Carbon and Other Biogeochemical Cycles Chapter 7: Clouds and Aerosols Chapter 8: Anthropogenic and Natural Radiative Forcing Chapter 8 Supplement Chapter 9: Evaluation of Climate Models Chapter 10: Detection and Attribution of Climate Change: from Global to Regional Chapter 11: Near - term Climate Change: Projections and Predictability Chapter 12: Long - term Climate Change: Projections, Commitments and Irreversibility Chapter 13: Sea Level Change Chapter 14: Climate Phenomena and their Relevance for Future Regional Climate Change Chapter 14 Supplement Technical Summary
Paleoclimate evidence and ongoing global changes imply that today's CO2, about 385 ppm, is already too high to maintain the climate to which humanity, wildlife, and the rest of the biosphere are adapted.
Firstly paleoclimate is not driven in any way by CO2 but by the proximity of planet Earth to supernova which Svensmark has helpfully converted into a nice graph that is a remarkable fit to global temperature reconstructions.
That it is possible to construct a metric that doesn't show regional warming in a certain roughly specified region on a certain unspecified time scale with a certain unspecified statistical technique in no way contradicts the assertion that the balance of observational evidence shows unusual recent global warming, in first order agreement with theoretical, computational, and paleoclimate evidence.
This is being actively investigated for the current human - caused global warming scenario with models and paleoclimate data.
Drawing on improved paleoclimate records and current global observations has prompted the authors to reach new conclusions about what constitutes a safe level of CO2.
The occurence of El Niño itself is — as far as science understands the phenomenon, based largely on Pliocene paleoclimate comparisons, even Eocene «clam studies «-- probably not strongly influenced by the trend of global climate warming.
The paleoclimate record makes it clear that a target to keep human made global warming less than 2 °C, as proposed in some international discussions, is not sufficient — it is a prescription for disaster.
Regarding paleoclimate findings supporting «global warming is happening and we are the cause», see Tom Curtis» comment here regarding Marcott et al 2013; in which Tom notes that Marcott et al found:
; North Pole Cam 1 & 2; Arctic Sea Ice Extent Averaging Below 2007 Anomaly; Paleoclimate Implications for Human - Made Climate Change; UN Security Council Addresses Considers Global Security and Climate Change; New study details glacier ice loss following ice shelf collapse; Climate Change To Spawn More Wildfires; Gingrich Says 2006 Climate Change Ad He Starred In Was «Misconstrued»
Answer: The first order of business here is to correct the mischaracterization of this single paleoclimate study as the «foundation» of global warming theory.
«Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 C global warming could be dangerous» J Hansen, M Sato, P Hearty, R Ruedy, M Kelley, V Masson - Delmotte,... Atmospheric Chemistry and Physics 16 (6), 3761 - 3812, 2016
In 2016, an examination of the peer - reviewed scientific literature has uncovered dozens of paleoclimate reconstructions that reveal modern «global» warming has not actually been global in scale after all, as there are a large number of regions on the globe where it has been cooling for decades.
Ice Patch Archaeology in Global Perspective: Archaeological Discoveries from Alpine Ice Patches Worldwide and Their Relationship with Paleoclimates.
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.
The initial title of «Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 °C global warming is highly dangerous» had the final phrase changed to «could be dangerous.»
Originally posted on Open Mind: A new paper by Hansen et al., Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 °C global warming is highly dangerous is currently under review...
The workshop was convened to build on the momentum of the successful Future Earth Past Global Changes (PAGES 2k) initiative and foster a more coordinated approach to coral paleoclimate research.
A useful gauge of the impact of a change of a few degrees in global mean temperature can be found in Tom Crowley's article on paleoclimate in this issue of CONSEQUENCES.
Very interesting, Mr. S. For those of us unfamiliar with the literature can you answer for us the most pressing question about this as a reply to Alson's question: are the paleoclimate runs referred to in this abstract performed by one of the models used for contemporary climate prediction and informing the global political process — i.e., one of those referred to in the IPCC reports?