Sentences with phrase «holocene climate»

With this proxy and instrumental information, researchers and others interested in later - Holocene climate can now find a complete set of data tools needed to calibrate and make temperature reconstructions.

Glacier records are very useful for studies of Holocene climate variability (e.g., Haeberli et al., 1998; and Section 2.4).

As an aside and slight conceptual digression with a tip of the cap to Roger Pielke Sr, perhaps this enjoyable and profitable Holocene climate is due, in part, to Anthropogenic Climate Moderation from 10K - years of agricultural and landuse alteration.

To sum up, recent global temperatures, weather, polar ice and sea levels are consistent with our knowledge of corresponding Holocene climate variability measures when man was not a factor to be considered.

My research incorporates glacial geoology and cosmogenic geochronology methods to reconstruct late - Quaternary and Holocene climate behaviour.

«we conclude that this relatively clean empirical assessment yields a fast feedback climate sensitivity in the upper part of the range suggested by the LGM Holocene climate change, i.e., a sensitivity 3 — 4 °C for 2 × CO2» (p. 23)

At what point can we identify an event or a set of events as outside the holocene climate altogether?

A negative trend is also seen in oxygen isotope records in Greenland ice cores (NGRIP - members 2004), which implies that the proxy records from northern Sweden display a general feature of Holocene climate in the North Atlantic region, possibly linked to orbital forcing of summer insolation.

That can also be explained if you accept that CO2 is nearly saturated and so climate sensitivity is low i.e. during the Holocene climate was driven by solar isolation not CO2.

Less dramatic cycles (the Holocene climate optimum, the little ice age, and the current warming) have affected humanity within our interglacial period.

The key issue seems to be the relatively stable holocene climate and ecology that has greatly benefited humanity, and could well do so for thousands of years more (some much - needed growing - up time).

We do not know enough to determine under what circumstance CO2 is a forcing or a feedback relative to temperature sometimes it maybe both sometimes over large areas it may even be a coolant e.g. if you think it is the main driver (which I don't) you would have to say it acted as a coolant for several thousand years from the Holocene climate optimum to the LIA — see Fig 6 in the last post at http://climatesense-norpag.blogspot.com I quoted the end Permian Siberian traps as a possible example of CO2 as a forcing but even here CO2 was rising rapidly before the volcanic event.

But overall the trend has been down, (as had the general direction of CO2 concentration, which had peaked during the Holocene Climate Optimum, and was also trending down until industrialization.

I propose it was human activity that led to the Holocene Climate Optimum, and the later gradual cooling.

And why isn't the same mechanism a valid explanation for the natural variations in Holocene climate?

Given your profound knowledge of Holocene climate proxies, your ample statistical knowledge, and the pitiful lack of a reliable Holocene temperature reconstruction, wouldn't you attempt to make and publish a better Holocene temperature reconstruction?

Holocene climate variability in Antarctica based on 11 ice - core isotopic records.

A multi-proxy paleolimnological reconstruction of Holocene climate conditions in the Great Basin, United States

Lin, V.N. Mikhalenko, D. R. Hardy, and J. Beer (2002) Kilimanjaro ice core records: Evidence of Holocene climate change in tropical Africa, Science 298, 589 - 593.

The ~ 1000 - year Eddy solar cycle seems to have dominated Holocene climate variability between 11,500 - 4,000 years BP, and in the last two millennia, where it defines the Roman, Medieval, and Modern warm periods.

1) The ~ 1000 - year Eddy solar cycle seems to have dominated Holocene climate variability between 11,500 - 4,000 years BP and in the last two millennia, where it defines the Roman, Medieval, and Modern warm periods.

Don't tell me about holocene climate stability, the climate has never been stable.

A lot of people might be surprised how strong is the evidence, and how important it has been for Holocene climate so far.

We know about the Holocene Climate Optimum or aka Hypsithermal, Altithermal, Climatic Optimum, Holocene Optimum, Holocene Thermal Maximum, and Holocene (according to wiki).

Reconstruction of Holocene climate shows that the 20th century was remarkably balmy for the US in particular.

In a recent review of Holocene climate variability (Part A, and Part B) it was shown that Milankovitch forcing was likely the primary driving force behind the general climate evolution from the Holocene Climatic Optimum to the Neoglacial period, for the past 12,000 years.

7) Holocene climate variability is characterized by periodic cooling events of reduced amplitude compared to glacial climate variability.

Summary: Holocene climate has been affected in different periods by several centennial to millennial solar cycles.

Thus Holocene climate change is dominated by periodic variability in the millennial band (grey band, figure 49).

The expected response to a step increase in CO2 is to move from the relatively stable Holocene climate through a period of rapid (in geological terms) change to a new, relatively stable climate with a higher overall temperature and somewhat different circulation and rainfall patterns.

A jaw bone found during the Eemian interglacial and they survived the Holocene Climate Optimum of ice - free Arctic Ocean.

Non-linear Holocene climate evolution in the North Atlantic: a high - resolution, multi-proxy record of glacier activity and environmental change from Hvitarvatn, central Iceland.

(I know this is terribly obvious, but so should Holocene climate fluctuations be obvious.

It has been warmer than the present for much of the ten thousand years since the last big ice age: it was a little warmer for a few centuries in the medieval warm period around 1100 (when Greenland was settled for grazing) and also during the Roman - Climate Optimum at the time of the Roman Empire (when grapes grew in Scotland), and at least 1 °C warmer for much of the Holocene Climate Optimum (four to eight thousand years ago).

The Earth is not now as warm as it was during the Holocene Climate Optimum, so one could say that to date there is no evidence that anthropogenic CO2 has raised the global mean temperature above its cyclic maximum.

The likelihood of occurrence or the fractional area covered by 3 - standard - deviation hot anomalies, relative to a base period (1951 — 1980) that was still within the range of Holocene climate, has increased by more than a factor of ten.

More generally, humanity and nature, the modern world as we know it, is adapted to the Holocene climate that has existed more than 10,000 years.

Identifying natural contributions to late Holocene climate change, Humlum et al, 09/2011; read more here.

The Northern Hemisphere was substantially warmer than the present for thousands of years during the Holocene Climate Optimum (~ 5,000 - 9,000 years ago).

Abrupt Holocene climate change and potential response to solar forcing in western Canada.

The Sahare went from swamp to sand in a thousand years because the mid Holocene climate cooled 2 - 5 degrees, not because it got warmer.

Bunker Cave stalagmites: an archive for central European Holocene climate variability, J. Fohlmeister, 2012.

Reconstructing Late Holocene climate.

Especially when you don't have the learning or the wit to distinguish between Holocene climate phenomena and deglacial / glacial climate phenomena.

The Polar Bears survived two Holocene Climate Optimums, a Roman Climate Optimum and a Medieval Warm Period, all warmer than now, and yet those darn bears are still here!

Evaluating Holocene climate change in northern Norway using sediment records from two contrasting lake systems., J. Paleolimnology 48, 259 - 273; Doi: 10.1007 / s10933 -012-9604-7.

Brown, E. T., R. Bendick, D. L. Bourlès, V. Gaur, P. Molnar, G. M. Raisbeck, and F. Yiou, Early Holocene climate recorded in geomorphological features in Western Tibet, Palaeogeography, Palaeoclimatology, Palaeoecology, 199, 141 - 151, 2003.

This is not adequate for Holocene climate change but the field is progressing fast.

Does it also include a Holocene Climate optimum, Minoan Warm Period, Roman Warm Period and Medieval Warm Period, and the cold epochs in between?

High - latitude areas by the poles warm more than the equator or the rest of the world average during times of high solar warming (Medieval Warm Period, Holocene Climate Optimum, Modern Warm Period, etc.).