Sentences with phrase «variability over millennia»

Great variability over millennia casts doubt on the statistical reliability of divining rainfall changes from modern records.

The are fundamental things in climate that lead to immense variability over millennia — the 20th century was relatively balmy compared to other periods in the recent past.

In the 20th we saw climate regimes and shifts that ultimately add up to climate variability over millennia.

Climate means and variance shift every 20 to 30 years and add up to variability over millennia.

But there is also variability over millennia.

Not exact matches

Separating Forced from Chaotic Climate Variability over the Past Millennium.

If you think all this is obvious, please hold the thought in mind, and bring it back when, towards the end of this commentary, I tell you what Esper et al. wrote in an opinion piece regarding the implications of natural variability observed over the past millennium.

The new paper places tighter constraints on variability over the last 3 millennia and identifies global fluctuations.

Koffman, B.G., Kreutz, K.J., Breton, D.J., Kane, E.J., Winski, D.A., Birkel, S.D., Kurbatov, A.V., and Handley, M.J., 2014, Centennial - scale variability of the Southern Hemisphere westerly wind belt in the eastern Pacific over the past two millennia.

Esper et al. (2012)-- «Variability and extremes of northern Scandinavian summer temperatures over the past two millennia»

The ice core CO2 record over the past millennium provides an additional constraint on natural climate variability.

However, models would need to underestimate variability by factors of over two in their standard deviation to nullify detection of greenhouse gases in near - surface temperature data (Tett et al., 2002), which appears unlikely given the quality of agreement between models and observations at global and continental scales (Figures 9.7 and 9.8) and agreement with inferences on temperature variability from NH temperature reconstructions of the last millennium.

record over the past millennium provides an additional constraint on natural climate variability.

Esper, J. et al. (2012) Variability and extremes of northern Scandinavian summer temperatures over the past two millennia.

Variability and extremes of northern Scandinavian summer temperatures over the past two millennia.

Separating Forced from Chaotic Climate Variability over the Past Millennium.

The hockey stick pattern also shows up in the following papers: «Pacific Ocean Heat Content During the Past 10,000 Years» «Inter-hemispheric temperature variability over the past millennium»

Our results show that hydroclimatic variability in the Southwest has not remained constant over the last millennia, with a shift from low to high variance at the MCA - LIA transition that was accompanied by a change in quasi-periodic variance, from a higher concentration of power in the multi-decadal periodicities during the MCA vs. interannual and decadal periodicities during the LIA.

The response of atmospheric CO2 and climate to the reconstructed variability in solar irradiance and radiative forcing by volcanoes over the last millennium is examined by applying a coupled physical — biogeochemical climate model that includes the Lund - Potsdam - Jena dynamic global vegetation model (LPJ - DGVM) and a simplified analogue of a coupled atmosphere — ocean general circulation model.

We used PDSI values from the North American Drought Atlas (NADA, version 2a) to detect changes in aridity variability and periodicity for the Southwest over the past millennium.

These changes in tropical Pacific Ocean SSTs over the past millennium have often been associated with internal variability of the ocean - atmosphere system [19,27,53,54] that may not be accurately represented in current climate models.

Variability and extremes of northern Scandinavian summer temperatures over the past two millennia, Esper et al, 01/2012; read more here.

Indeed, data over millennia on the El Niñ0 - Southern Oscillation (ENSO) show variability considerably in excess of that seen in the last century.

Solar variability over the past several millennia.

The hockey stick pattern also shows up in the following papers: «Medieval Warm Period, Little Ice Age and 20th century temperature variability from Chesapeake Bay» «Inter-hemispheric temperature variability over the past millennium»

Inter-hemispheric temperature variability over the past millennium.

Emile - Geay, J., Cobb, K. M., Mann, M. E. & Wittenberg, A. T. Estimating central equatorial Pacific SST variability over the past millennium.

Schurer, A. P., Tett, S. F. B. & Hegerl, G. C. Small influence of solar variability on climate over the past millennium.

«Over the past millennium, late 20th century snowpack reductions are almost unprecedented in magnitude across the northern Rocky Mountains and in their north - south synchrony across the cordillera... the snowpack declines and their synchrony result from unparalleled springtime warming that is due to positive reinforcement of the anthropogenic warming by decadal variability.

What are the bounds of natural variability over the past millennia?

I am not aware of evidence for natural variability / oscillations that shuffle heat around having operated on the multi-century timescale over the past millennium.

Title: Variability of sea - surface temperature and sea - ice cover in the Fram Strait over the last two millennia Author (s): Bonnet, S; de Vernal, A; Hillaire - Marcel, C, et al..

Having evolved in a region with less climate variability over both the years and the millennia, tropical species may harbor a less diverse set of genes related to heat tolerance and similar traits.