Can long - term cycles in ocean temperature such as the Pacific
Decadal Oscillation explain the centennial trend?
Not exact matches
It should also be noted that the authors examined whether the large - scale ocean circulation, the Meridional Overturning Circulation (MOC), and two other ocean phenomena - the Pacific
Decadal Oscillation (PDO) and Atlantic Meridional
Oscillation (AMO)- could
explain the warming in the 20th century simulations, but found no evidence in the models.
In Atmospheric Controls On Northeast Pacific Temperature Variability And Change, 1900 — 2012, Johnstone 2014 showed the Pacific
Decadal Oscillation can
explain climate change in the Pacific northeast without invoking greenhouse gases.
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 mea
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 mea
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 measurements).
In 2014 climate scientists published a peer - reviewed paper (Johnstone 2014) suggesting that climate change along the coast of North America could be best
explained by natural cycles of Pacific
Decadal Oscillation (PDO) due to its affects on sea surface temperatures in the eastern Pacific.
ENSO (El Nino Southern
Oscillation) and PDO (Pacific
Decadal Oscillation) help to
explain short - term variations, but have no long - term trend, warming or otherwise.
Recently, the peer reviewed journal Nature took a stab at
explaining «The Hiatus» by ultimately suggesting that the Pacific
Decadal Oscillation shift to cooling was to blame.
It is highly likely that due to its effect on storm tracks and competing air masses, the AMO can
explain most of the east coast's temperature trends in a manner similar to how the Pacific
Decadal Oscillation controls the USA's west coast trends as published by Johnstone 2014.
Now forced to
explain the warming hiatus, Trenberth has flipped flopped about the PDO's importance writing «One of the things emerging from several lines is that the IPCC has not paid enough attention to natural variability, on several time scales,» «especially El Niños and La Niñas, the Pacific Ocean phenomena that are not yet captured by climate models, and the longer term Pacific
Decadal Oscillation (PDO) and Atlantic Multidecadal
Oscillation (AMO) which have cycle lengths of about 60 years.»
The latitudinal limits between those climates are shifting northward or southward according to cycles as seen on figure 21 - B for the USA [74]; this may
explain the fear, expressed in the 1970s in many periodical and books, of an imminent glaciation; that fear faded after the reversal of the PDO (Pacific
Decadal Oscillation) in 1977.
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
Decadal and longer internal
oscillations could
explain the temperature record of the last 100 years.
However, one analysis that has attempted to
explain both the very large winter extents of 2012, 2013, and 2014, and the subsequent lower and near - average winter maximums in 2015 and 2016 has suggested that the El Niño Southern
Oscillation and a Pacific trend called the Pacific
Decadal Oscillation (a residual tendency toward El Niño or La Niña in the Pacific that shifts on multi-
decadal timescales) may be linked to the change.
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).