Sentences with phrase «decadal oscillation pattern»

Not exact matches

In April 2008, scientists at NASA's Jet Propulsion Laboratory announced that while the La Niña was weakening, the Pacific Decadal Oscillation (PDO)-- a larger - scale, slower - cycling ocean pattern — had shifted to its cool phase.

This variability includes the Pacific Decadal Oscillation (PDO), a long - lived El Niño - like pattern of Pacific climate variability that works like a switch every 30 years or so between two different circulation patterns in the North Pacific Ocean.

Goddard thinks it may be an early indication of a big shift in the Pacific Decadal Oscillation (PDO), a kind of long - term El Niño - like pattern of climate variability.

The ocean factors included upwelling of nutrient - rich water and the Pacific Decadal Oscillation, a large - scale marine temperature pattern.

The researchers compared this long fire record with weather patterns: the well - known El Nino and La Nina cycles that occur every two to seven years, as well as longer cycles called the Pacific Decadal Oscillation and the Atlantic Multidecadal Oscillation (AMO).

The study stops short of attributing California's latest drought to changes in Arctic sea ice, partly because there are other phenomena that play a role, like warm sea surface temperatures and changes to the Pacific Decadal Oscillation, an atmospheric climate pattern that typically shifts every 20 to 30 years.

That's largely because of a long - time - scale weather pattern called the Pacific Decadal Oscillation, which is masking the global effect.

He thinks their movement may be an early indication of a big shift in the Pacific Decadal Oscillation (PDO), a long - term pattern of climate variability.

Nieves said an example is the U.S. West Coast, where the phase of a multi-decadal ocean climate pattern called the Pacific Decadal Oscillation has helped keep sea level rise lower during the past two decades.

On decadal time scales, annual streamflow variation and precipitation are driven by large - scale patterns of climate variability, such as the Pacific Decadal Oscillation (see teleconnections description in Climate chapter)(Pederson et al. 2011a; Seager and Hoerlingdecadal time scales, annual streamflow variation and precipitation are driven by large - scale patterns of climate variability, such as the Pacific Decadal Oscillation (see teleconnections description in Climate chapter)(Pederson et al. 2011a; Seager and HoerlingDecadal Oscillation (see teleconnections description in Climate chapter)(Pederson et al. 2011a; Seager and Hoerling 2014).

Large interannual variability in snowpack can be nested within Pacific Decadal Oscillation (and Pacific North American) driven patterns (e.g., see the high snow years of 1996 and 1997 that occurred during a 25 - year period of below average snowpack).

On shorter time scales, and layered on top of Pacific Decadal Oscillation variation, the Pacific North American pattern and the El Niño - Southern Oscillation cycles (see Climate chapter) can also affect variation in snowpack.

-- The Pacific Decadal Oscillation is a pattern of ocean - atmospheric climate variability across the mid-latitude Pacific Ocean.

We describe two of the most important teleconnections for Montana below, the El Niño - Southern Oscillation and the Pacific Decadal Oscillation.8 It is important to bear in mind that teleconnections are happening continually, and superimposed on each other as well as upon other long - term climate patterns.

The Pacific Decadal Oscillation is a pattern of ocean - atmospheric climate variability across the mid-latitude Pacific Ocean.

The first collection of papers establishes that (a) decadal and multi-decadal ocean circulation patterns (AMO, PDO, NAO, ENSO) have significantly modulated precipitation and temperature changes in recent decades, and the second collection of papers confirm that (b) natural ocean oscillations are, in turn, modulated by solar activity.

It is important to note that any potential effects will be spatially and temporally variable, depending on current forest conditions, local site characteristics, environmental influences, and annual and decadal patterns of climate variability, such as the El Niño - Southern Oscillation cycle, which can drive regional weather and climate conditions.

oscillation A recurring cyclical pattern in global or regional climate that often occurs on decadal to sub-decadal timescales.

The data the researchers were interested in tracking revolved around four important climate indices: the Pacific Decadal Oscillation; the Multivariate El Niño Southern Oscillation Index, which includes both El Niño and La Niña; the Southern Annular Mode; and the Pacific North American Pattern.

His research concerns understanding global climate and its variations using observations and covers the quasi biennial oscillation, Pacific decadal oscillation and the annular modes of the Arctic oscillation and the Antarctic oscillation, and the dominant spatial patterns in month - to - month and year - to - year climate variability, including the one through which El Niño phenomenon in the tropical Pacific influences climate over North America.

So has a broader, 10 - year warming and cooling pattern called the Pacific Decadal Oscillation.

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).

# 8220; This multi-year Pacific Decadal Oscillation «cool» trend can intensify La Niña or diminish El Niño impacts around the Pacific basin,» said Bill Patzert, an oceanographer and climatologist at NASA's Jet Propulsion Laboratory, Pasadena, Calif. «The persistence of this large - scale pattern [in 2008] tells us there is much more than an isolated La Niña occurring in the Pacific Ocean.»

Abstract — 2008 Climate and wildfires in the North American boreal forest... Climate controls the area burned through changing the dynamics of large - scale teleconnection patterns (Pacific Decadal Oscillation / El Niño Southern Oscillation and Arctic Oscillation, PDO / ENSO and AO) that control the frequency of blocking highs over the continent at different time scales......... Since the end of the Little Ice Age, the climate has been unusually moist and variable: large fire years have occurred in unusual years, fire frequency has decreased and fire — climate relationships have occurred at interannual to decadal time scales...... http://rstb.royalsocietypublishing.org/content/363/1501/2315.short ---------------Decadal Oscillation / El Niño Southern Oscillation and Arctic Oscillation, PDO / ENSO and AO) that control the frequency of blocking highs over the continent at different time scales......... Since the end of the Little Ice Age, the climate has been unusually moist and variable: large fire years have occurred in unusual years, fire frequency has decreased and fire — climate relationships have occurred at interannual to decadal time scales...... http://rstb.royalsocietypublishing.org/content/363/1501/2315.short ---------------decadal time scales...... http://rstb.royalsocietypublishing.org/content/363/1501/2315.short ----------------------

The dipole and associated circulation pattern is not linked directly with either El Niño — Southern Oscillation (ENSO) or Pacific Decadal Oscillation; instead, it is correlated with a type of ENSO precursor.

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 interannudecadal - 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 interannuDecadal 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 interannudecadal to interannual.....

The Atlantic Multidecadal Oscillation (AMO) is a naturally occurring pattern of sea surface temperature change that is seen in the North Atlantic Ocean on decadal timescales and affects weather and climate.

Among the weather phenomenon that could be affecting wave heights in the Pacific, Ruggiero said, are El Nino — warmer surface temperatures in the tropical eastern Pacific — and the Pacific Decadal Oscillation — 20 - to 30 - year patterns of warmer or cooler surface temperatures in the Pacific.

■ Pacific Decadal Oscillation (PDO)-- an SST pattern in the North Pacific Ocean.

Other well - known modes of variability include: The Antarctic oscillation; The Arctic oscillation; The Atlantic multidecadal oscillation; The Indian Ocean Dipole; The Madden — Julian oscillation; The North Atlantic oscillation; The Pacific decadal oscillation; The Pacific - North American teleconnection pattern; The Quasi-biennial oscillation.

The wind patterns may have changed due to a combination of the current Pacific Decadal Oscillation which has now started changing, and the ozone hole allowing more sunlight to reach the surface rather than being absorbed in the stratosphere; the extra energy from this may have accelerated the winds.

However, direct attribution of these changes to climate change is made difficult by long - term patterns of variability that influence productivity of different parts of the Ocean (e.g., Pacific Decadal Oscillation).

This study shows that the coupled climate models have mixed results in reproducing the spatial and temporal characteristics of major observed Pacific climate patterns of variability (e.g., the Pacific Decadal Oscillation (PDO) and El Niño).

Decadal variations in the North Pacific Gyre Oscillation are characterized by a pattern of sea surface temperature anomalies that resemble the central Pacific El Niño, a dominant mode of interannual variability with far - reaching effects on global climate patterns5, 6, 7.

The «Pacific Decadal Oscillation» (PDO) is a long - lived El Niño - like pattern of Pacific climate variability.

The Pacific Decadal Oscillation has the same temporal pattern of warm and cool surface water — which raises interesting questions about how these northern and southern hemisphere ocean phenomenon are linked.

Regional snow depth in spring (April - May) varies naturally from year to year due to weather patterns driven in part by long - term climate cycles (like the Atlantic Multidecadal Oscillation, Pacific Decadal Oscillation, and the Arctic Oscillation).

Over the past 60 years, Alaska has warmed more than twice as rapidly as the rest of the United States, with state - wide average annual air temperature increasing by 3 °F and average winter temperature by 6 °F, with substantial year - to - year and regional variability.1 Most of the warming occurred around 1976 during a shift in a long - lived climate pattern (the Pacific Decadal Oscillation [PDO]-RRB- from a cooler pattern to a warmer one.

«The Pacific Decadal Oscillation is a climate index based upon patterns of variation in sea surface temperature of the North Pacific from 1900 to the present (Mantua et al. 1997).

Decadal variability is described via large - scale patterns found in the atmosphere and ocean, which oscillate at decadal timescales and are concentrated in specific regions (e.g., Pacific Decadal Oscillation, Atlantic Multidecadal Oscillation, Arctic and Antarctic OscillaDecadal variability is described via large - scale patterns found in the atmosphere and ocean, which oscillate at decadal timescales and are concentrated in specific regions (e.g., Pacific Decadal Oscillation, Atlantic Multidecadal Oscillation, Arctic and Antarctic Oscilladecadal timescales and are concentrated in specific regions (e.g., Pacific Decadal Oscillation, Atlantic Multidecadal Oscillation, Arctic and Antarctic OscillaDecadal Oscillation, Atlantic Multidecadal Oscillation, Arctic and Antarctic Oscillations).

As of spring 2015, a wide strip of relatively warm water is present along the entire West Coast of North America (Figure 1), in a pattern projecting on the positive phase of the Pacific Decadal Oscillation.

Regional circulation patterns have significantly changed in recent years.2 For example, changes in the Arctic Oscillation can not be explained by natural variation and it has been suggested that they are broadly consistent with the expected influence of human - induced climate change.3 The signature of global warming has also been identified in recent changes in the Pacific Decadal Oscillation, a pattern of variability in sea surface temperatures in the northern Pacific Ocean.4

It is manifested as strong anomalous easterly trade winds, distinctive sea - level pressure patterns, and large rainfall anomalies in the Pacific, which resemble the Pacific Decadal Oscillation (PDO).

But for a decade or so earlier in the century, another Pacific feature was slowly unfolding: the Pacific Decadal Oscillation, which blows warm and cool, in a cyclic pattern.

What was done, was to take a large number of models that could not reasonably simulate known patterns of natural behaviour (such as ENSO, the Pacific Decadal Oscillation, the Atlantic Multidecadal Oscillation), claim that such models nonetheless accurately depicted natural internal climate variability, and use the fact that these models could not replicate the warming episode from the mid seventies through the mid nineties, to argue that forcing was necessary and that the forcing must have been due to man.

Part of that wiggle comes from natural climate patterns such as the Pacific Decadal Oscillation (PDO).

The typical pattern of a cool phase of the Pacific decadal oscillation is for 20 to 40 years of more intense and more frequent La Nina.

This variability includes the Pacific Decadal Oscillation (a long - lived El Niño - like pattern of Pacific climate variability) and anthropogenic pollutants, which act to modify the Pacific Decadal Oscillation.