Sentences with phrase «centennial scale variability»

The climate of the past millennium was marked by substantial decadal and centennial scale variability in the Northern Hemisphere.

Not exact matches

Modes of climate variability contribute to significant MHW variations both regionally, and globally, but do not greatly affect the centennial - scale secular changes described above.

An enhanced variability of temperature during the last millenium suggested by the work of Esper, Moberg, etc. is mainly related to the time frame 1000 — 1900 and the centennial time - scale.

SPARC, together with others in the WCRP community, focuses on understanding atmospheric dynamics and climate variability to provide better climate predictions on scales from seasonal all the way to centennial.

Seasonal to centennial - scale variability of microparticle concentration and size distribution in the WAIS Divide ice core over the past 2.4 ka.

The ability of a sampling method to accurately measure seasonal variability does not indicate that the method is valid for estimating trends over centennial time scales.

This bias would not have similarly affected the «corridor method» used by Hantemirov and Shiyatov themselves, since this method which did not preserve centennial - scale variability and Hantemirov and Shiyatov would not have been concerned about potential bias introduced by how their cores were selected on a RCS chronology method that they themselves were not using.»

An enhanced variability of temperature during the last millenium suggested by the work of Esper, Moberg, etc. is mainly related to the time frame 1000 — 1900 and the centennial time - scale.

The suggested synchroneity of tropical and North Atlantic centennial to millennial variability (de Menocal et al., 2000; Mayewski et al., 2004; Y.J. Wang et al., 2005) is not common to the SH (Masson et al., 2000; Holmgren et al., 2003), suggesting that millennial scale variability can not account for the observed 20th - century warming trend.

An increasing number of Holocene proxy records are of sufficiently high resolution to describe the climate variability on centennial to millennial time scales, and to identify possible natural quasi-periodic modes of climate variability at these time scales (Haug et al., 2001; Gupta et al., 2003).

The study by Macias & Johnson (2008) provides not only evidence for the link between decadal - scale changes in the teleconnection patterns (e.g. the Pacific Decadal Oscillation (PDO) index) and the increased fire frequency in the late twentieth century but also an explanation of why the pattern of fire variability and fire - climate relationships changes at different time scales from centennial / decadal to interannual.....

The platform will complement existing GMES / Copernicus pre-operational components, but will focus on datasets which provide information on climate variability on decadal to centennial time scales from observed and projected climate change impacts in Europe, and will provide a toolbox to generate, compare and rank key indicators.

Climate shifts unpredictably at multi-decadal scales producing extreme variability at centennial to millennial scales.

Here is their description of the work: The influence of solar variability on Earth's climate over centennial to millennial time scales is the subject of considerable debate.

At multi-decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them.

Natural variability periodically augments and offsets any long term forced trend, with roughly zero net effects on a centennial scale.

Although continuous observations of the tilt angle are made by the Wilcox Solar Observatory (WSO) since 1976, for the purpose of centennial reconstructions of the CR modulation it is important to know the tilt angle variability on longer time scale.

Therefore, it is important to know its variability in order to study large scale HMF dynamics and the heliospheric modulation of cosmic rays on long time scale including the centennial trends.

Specifically, it has been suggested that centennial - scale climate variability during the Holocene epoch was controlled by the Sun.

To describe and understand the physical processes responsible for climate variability and predictability on seasonal, interannual, decadal, and centennial time - scales, through the collection and analysis of observations and the development and application of models of the coupled climate system, in cooperation with other relevant climate - research and observing programmes.

Additional proxy records that cover the entire CE are needed to investigate decadal - to centennial - scale responses of climate to changes in radiative forcing as well as internal variability at these time scales.

The Holocene in general shows both a long - term trend (cooling) and millennial and centennial / multidecadal time - scale variability.

This big data approach will give us the tools necessary to investigate interannual - to centennial - scale variability, as well as possible secular trends in hydroclimate over the past 2,000 years.

Because our main goal is to reproduce the centennial solar variability and because magnetograms are unavailable for historical time periods, we scale the faculae and the active network filling factors with the sunspot number instead of using filling factors derived from available magnetogram data.

We assert that the amount of magnetic energy that remains present (de Wijn et al. 2009) at the surface of a spotless (i.e. quiet) Sun is the main driver of solar irradiance variability on centennial time scales.

As a result, no conclusions should be drawn with respect to centennial - scale variability from the Hantemirov chronology.

The temporal relationship between the Suess solar cycle and particularly significant 210 yr oscillations in the speleothem δ18O records therefore supports the notion that solar variability played a significant role in driving centennial - scale changes in the hydrological cycle in the subtropics during the Holocene.

Models are able to reproduce many features of the observed global and Northern Hemispher (NH) mean temperature variance on interannual to centennial time scales (high confidence), and most models are now able to reproduce the observed peak in variability associated with the El Niño (2 - to 7 - year period) in the Tropical Pacific.

Virtually all of these used chronologies or tree ring climate reconstructions produced using methods that preserve multi-decadal and centennial time scale variability.

The bicentennial trend lines clearly diverge from the past 30 or 50 or hundred years, and the most closely fitting explanation for this behavior is anthropogenic causes shifting the trends leaving only a shadow of natural variability superimposed on the sharp centennial scale rise, at about an order of magnitude smaller amplitude than the changes associated with GHGs and dampened by man - made aerosols.

They indicate a greater range of variability on centennial time scales prior to the 20th century, and also suggest slightly cooler conditions during the 17th century than those portrayed in the Mann et al. (1998, 1999) series.

Figure 6.10 b illustrates how, when viewed together, the currently available reconstructions indicate generally greater variability in centennial time scale trends over the last 1 kyr than was apparent in the TAR.

My studies range from detailed aerosol processes such as the formation of secondary organic aerosols (SOA), to centennial time scale climate variability related to natural variability and external forcings.