Sentences with phrase «year oscillation found»

Not exact matches

The researchers found that the rainfall predicted for East Africa on a decadal scale by models using the effects of the El Niño Southern Oscillation and the Indian Ocean Dipole did not account for as much of the rainfall fluctuations as expected for the past 34 years.

These findings agree well with the discovery last year by Cassini that Enceladus undergoes large back - and - forth oscillations, called libration, during its orbit.

It is found that the El Niño — Southern Oscillation (ENSO) is driven not only by the seasonal heating, but also by three more external periodicities (incommensurate to the annual period) associated with the ~ 18.6 - year lunar - solar nutation of the Earth rotation axis, ~ 11 - year sunspot activity cycle and the ~ 14 - month Chandler wobble in the Earth's pole motion.

The study tracked changes in the sun by looking at previous solar cycles of change, such as Cycle 22 which lasted from the years 1986 to 1996, and found that the oscillation frequencies were confined to a thinner layer than those previous cycles.

Natural climate variability of the Arctic atmosphere, the impact of Greenland and PBL stability changes K. Dethloff *, A. Rinke *, W. Dorn *, D. Handorf *, J. H. Christensen ** * AWI Potsdam, ** DMI Copenhagen Unforced and forced long - term model integrations from 500 to 1000 years with global coupled atmosphere - ocean - sea - ice models have been analysed in order to find out whether the different models are able to simulate the North Atlantic Oscillation (NAO) similar to the real atmosphere.

In their paper Decadal Variations in the Global Atmospheric Land Temperatures, they find that the largest contributor to global average temperature variability on short (2 - 5 year) timescales in not the El Nino - Southern Oscillation (ENSO)(as everyone else believes), but is actually the Atlantic Multidecadal Oscillation (AMO).

Mike's work, like that of previous award winners, is diverse, and includes pioneering and highly cited work in time series analysis (an elegant use of Thomson's multitaper spectral analysis approach to detect spatiotemporal oscillations in the climate record and methods for smoothing temporal data), decadal climate variability (the term «Atlantic Multidecadal Oscillation» or «AMO» was coined by Mike in an interview with Science's Richard Kerr about a paper he had published with Tom Delworth of GFDL showing evidence in both climate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 meaOscillation» or «AMO» was coined by Mike in an interview with Science's Richard Kerr about a paper he had published with Tom Delworth of GFDL showing evidence in both climate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 meaoscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measurements).

Using the Bond periogram method to explore for quasi-periods, up to 300 years I find none except possibly between 45 and 90 years; these might be due to the various ocean «oscillations».

the proposed harmonic model (which herein uses cycles with 9.1, 10 — 10.5, 20 — 21, 60 — 62 year periods) is found to well reconstruct the observed climate oscillations from 1850 to 2011, and it is shown to be able to forecast the climate oscillations from 1950 to 2011 using the data covering the period 1850 — 1950, and vice versa.

vrpratt and MattStat re: 1000 year cycle Loehle and Singer evaluated nine temperature reconstructions and found a climate cycle about 1500 years (or 1200) long that may correspond to the Pleistocene Dansgaard - Oeschger (DO) oscillations.

They found a 60 - to 90 - year cycle in Barents and Greenland seas ice extent related to the Atlantic Multidecadal Oscillation (AMO); the AMO is a basin - wide cycle of sea surface temperature variability similar to the El Niño and La Niña cycles in the Pacific, but varying over much longer periods.

Instead of a steady increase of global temperature in the eighties and nineties we find an up and down temperature oscillation for twenty years until real warming starts in 1998.

Given that the climate scientists have been studying the climate with massive funding for over 30 years since Hansen's 1981 predictions, and given that modelers are constantly trying to improve their models to include the new found knowledge about various climate forcings, feedbacks, oscillations, etc. that resulted, it seems that there should have been SOME improvement in the predictions over the years.

This article makes use of recent findings about the relatively short decadal or multi decadal (20 to 30 years) oceanic oscillations that, the writer contends, are short enough to bring the time scales involved in oceanic changes into line with the solar cycles of 11 years or so.

Since the observed Schwabe cycle variations are small, eleven - year periods frequently found in climate data are often ascribed instead to hypothesized oscillations in the atmosphere or oceans, internal to the climate system.

Foster and Rahmstorf (2011) used multiple linear regression to filter out the effects of the El Niño Southern Oscillation (ENSO), and solar and volcanic activity (Figure 2), and found that the underlying global surface and lower atmosphere warming trends have remained very steady in recent years (Figure 3).

We find that there is a significant oscillation with a period around 60 - years in the majority of the tide gauges examined during the 20th Century, and that it appears in every ocean basin.

Since data has been available for < 200 years it would be hard to find oscillations of 100 years or more, just not enough room to fit in.

On the contrary, the proposed harmonic model (which herein uses cycles with 9.1, 10 — 10.5, 20 — 21, 60 — 62 year periods) is found to well reconstruct the observed climate oscillations from 1850 to 2011, and it is shown to be able to forecast the climate oscillations from 1950 to 2011 using the data covering the period 1850 — 1950, and vice versa.

A recently published paper in Scientific Reports has found that climate variability in the form of the North Atlantic Oscillation (NAO) has had a significant impact on the occurrence of disease outbreaks in Europe over the past fifty years.

He proposes a relationship between the Pacific Decadal Oscillation (PDO) and clouds by considering a variety of combinations of initial ocean temperature, ocean thickness, cloud feedback, and forcing by clouds (neglecting forcing by CO2 and the water vapor feedback entirely) in a simple energy balance model, and finds a relationship between PDO and clouds using 9 years of satellite data.

This may explain the frequent finding that many global warming time series, e.g., the Southern oscillation index and the Pacific decadal oscillation, show distinct cycle times (Power spectral analysis: 3 — 5, 7 — 8, 13 — 15, 22 — 24, and 29 — 30 years).

As far as can se from the CET and the N. Atlantic geological records oscillations vary in length between 46 and 65 years, however the average since 1650 happens to be ~ 60 years: http://www.vukcevic.talktalk.net/NVb.htm from 1890 I found periods 52, 62, and 65, so in a short - ish period of data FT analysis may this identify around 60 yr.

I would be interested how you find a diurnal or even annual pattern after 3 multimonth smoothings looking at a 60 year oscillation.