The experimental protocol
for the Decadal Climate Prediction Project (DCPP) contribution to CMIP6 is described in detail in Boer et al. (2016).
This hindcast setting roughly follows the experimental design of the Coupled Model Intercomparison Project - 5 (CMIP5)
for decadal climate prediction (Taylor et al. 2009; Murphy et al. 2010).
Not exact matches
A study led by scientists at the GEOMAR Helmholtz Centre
for Ocean Research Kiel shows that the ocean currents influence the heat exchange between ocean and atmosphere and thus can explain
climate variability on
decadal time scales.
A new report by the National Academies of Sciences, Engineering, and Medicine finds that continuity of ocean observations is vital to gain an accurate understanding of the
climate, and calls
for a
decadal, national plan that is adequately resourced and implemented to ensure critical ocean information is available to understand and predict future changes.
The value of this information is illustrated by the results of a study published May 19 in the journal Geophysical Research Letters by Oster's group, working with colleagues from the Berkeley Geochronology Center, the Smithsonian Institution National Museum of Natural History and the University of Cambridge titled «Northeast Indian stalagmite records Pacific
decadal climate change: Implications
for moisture transport and drought in India.»
Under the
Decadal and Regional
Climate Prediction Using Earth System Models (EaSM) program, the National Science Foundation and the U.S. Departments of Agriculture and Energy will kick in a total of $ 50 million a year
for 5 years.
The agencies will invest nearly $ 50 million annually in the new program, dubbed «
Decadal and Regional
Climate Prediction Using Earth System Models,» or EaSM
for short, and expect to deliver improved versions within the next three years.
For climate scientists, a major question is whether the coming event will be big enough to flip the world into the warm phase of the Pacific
Decadal Oscillation (PDO), a 20 - to 30 - year
climate cycle that is related to El Niño or La Niña conditions.
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.
And he said it can be difficult to factor the effects of the Pacific
Decadal Oscillation (PDO) into any
climate studies, given that «high quality data» exists
for fewer than two of its complete oscillations.
Nate, a member of the FI Board of Directors, is the leader
for the Landscape Ecology Team at NOAA's Southwest Fisheries Science Center, and has expertise about
decadal - scale
climate variability and ecosystem regime shifts.
The big takeaway from this study: While there is uncertainty in projections
for changes in the
climate indices reviewed here (especially El Niño and La Niña), this study serves to alert us to the fact that the
climate impacts that our local coastal communities face are based in large part on changes that occur on both a large, global scale and over the long,
decadal term.
For the most part, I've not seen much evidence to suggest that internal variations alone can bring the
climate to a new state on
decadal timescales, even if the internal fluctuations do not completely average out over decades (e.g.,, the PDO being in a positive phase more than a negative phase during the timescale of consideration).
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 measure
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 measure
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 measure
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 measure
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 measure
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 measure
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).
For the future, data assimilation might help us to keep the state of a
climate model closer to the real world's, allowing us to improve predictions on seasonal and
decadal time scales.
For methane to be a game - changer in the future of Earth's
climate, it would have to degas to the atmosphere catastrophically, on a time scale that is faster than the
decadal lifetime of methane in the air.
In other words, it is possible that the the
climate system does exhibit some kind of long - term chaos in some circumstances, but that the forcing is strong enough to wipe out any significant uncertainty due to initial conditions — at least if one is content to forecast statistical quantities such as,
for example,
decadal mean January temperatures in some suitably large region, or perhaps temperature variances or quartiles taken over a similar period.
For weather predictions, accuracy disappears within a few weeks — but for ocean forecasts, accuracy seems to have decadal scale accuracy — and when you go to climate forcing effects, the timescale moves toward centuries, with the big uncertainties being ice sheet dynamics, changes in ocean circulation and the biosphere respon
For weather predictions, accuracy disappears within a few weeks — but
for ocean forecasts, accuracy seems to have decadal scale accuracy — and when you go to climate forcing effects, the timescale moves toward centuries, with the big uncertainties being ice sheet dynamics, changes in ocean circulation and the biosphere respon
for ocean forecasts, accuracy seems to have
decadal scale accuracy — and when you go to
climate forcing effects, the timescale moves toward centuries, with the big uncertainties being ice sheet dynamics, changes in ocean circulation and the biosphere response.
To the uninitiated, I suspect the claim reads as though
climate is a highly variable entity (it would be worth polling an audience
for how they interpret it) that just gets up on its own and does what it wants on
decadal timescales, sort of like a random walk that is unconstrained by any physics.
«The forecast
for global mean temperature which we published highlights the ability of natural variability to cause
climate fluctuations on
decadal scale, even on a global scale.
The potential
for self - delusion is significantly enhanced by the fact that
climate data generally does have a lot of signal in the
decadal band (say between 9 and 15 years).
Bob Davis also won the AAG
Climate Specialty Group Paper of the Year award in 2004
for his paper «
Decadal changes in summer mortality in U.S. cities,» International Journal of Biometeorology 47:166 - 175.
Back around 2007/8, two high - profile papers claimed to produce,
for the first time, skilful predictions of
decadal climate change, based on new techniques of ocean state initialization in
climate models.
It appears that Ghil, and others specifically warn against the use of MEM and temperature data: «Instrumental temperature data over the last few centuries do not seem,
for instance, to determine sufficiently well the behavior of global or local temperatures to permit a reliable
climate forecast on the
decadal timescale by this SSA - MEM method.»
These factors driving the present changes of the NHSM system are instrumental
for understanding and predicting future
decadal changes and determining the proportions of
climate change that are attributable to anthropogenic effects and long - term internal variability in the complex
climate system.
The declining signal over India shown by the GPCP
decadal mode is broadly consistent with gauge measurements since the 1950s — that several research groups including my own are trying to understand, perhaps relating to emissions of anthropogenic aerosol — although there are discrepancies between these gauge - based data sets themselves (see our recent review in Nature
Climate Change,
for example).
Indeed regionally, interannual and
decadal variability is still dominant in the
climate record and will be
for a long time.
and J. Willebrand, J. (1996) «
Decadal Variability», Springer, NATO ASI series, volume 44; chapter: «Spectral Methods: What they Can and Can not Do
for Climate Times Series» by M. Ghil and P. Yiou
PCIC welcomes Dr. Alex Cannon who has joined PCIC as a Research Climatologist to work alongside the consortium's scientific and technical staff in the development of new tools and methodology
for predicting
climate extremes on seasonal and
decadal time scales.
In terms of the risk this has never been about
decadal fine tuning, but about (preventing) the longterm slide into an entirely different
climate the Earth hasn't seen
for millions of years.
Part of the basis
for the Mail's claims appears to be Latif et al's 2008 Nature paper, Advancing
decadal - scale
climate prediction in the North Atlantic sector.
Jan 15, 2018:
For the MiKlip II project (short for «decadal climate predictions»), a magnetic tape library has been put into operation at the DKRZ to store the resulting project da
For the MiKlip II project (short
for «decadal climate predictions»), a magnetic tape library has been put into operation at the DKRZ to store the resulting project da
for «
decadal climate predictions»), a magnetic tape library has been put into operation at the DKRZ to store the resulting project data.
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 interannu
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 interannu
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 interannu
decadal to interannual.....
One notable point is that I received no pushback from anyone
for my statements on the value of the 21st century
climate models to support water decision making, and the usefulness of the PDO and AMO on
decadal time scales.
Decadal nets are important
for climate trends and sea level.
Pachauri, Rajendra, 6, 30, 56, 146, 156 Pacific
Decadal Oscillation (PDO), 68 - 69, 240 Pacific Ocean, 58, 62, 68 - 69, 74, 102, 116, 140 Packard Foundation, 175 Pakistan, 1 Palmer, Andy, 213 Parker, Kevin, 13 Pasteur Institute, 136 Peak oil, 220 - 221, 244 Peer review, 4, 62, 66, 82, 88, 131, 155 - 158, 162, 167 Pell, George, 227 Pelley, Scott, 141 Pelosi, Nancy, 17 Pennsylvania State University, 128 People
for the Ethical Treatment of Animals (PETA), 30 Peru, 67 - 68 Peterson, Thomas, 162 Petroleum (see oil) Pew Center, 115 Pew Charitable Trusts, 12 Photosynthesis, 77, 131 pH Scale, 139 Pielke Sr., Roger, 148 Poland, 225 - 226 Polar bear, 1, 16, 24, 103, 136 - 138, 144, 186, 228, 231, 236, 240, 246 Politico, 175 Pollution, 21, 38 - 40, 49, 129, 133, 135, 139, 209 - 210, 225 carbon, 2, 128, 130, 132, 138, 144 Population, 32 - 33, 37, 39, 143, 184, 186 Porritt, Jonathan, 31 Power Hungry, 195 Prescott, John, 35 President's
Climate Commitment, 12 Princeton University, 64, 74, 132 Propaganda, climate, 12 Proposition 23, 128 Public Broadcasting Station (PBS), 106 Public Service Company in Colorado, 199 Pugh, Lewis Gordon, 111 Purdue Universi
Climate Commitment, 12 Princeton University, 64, 74, 132 Propaganda,
climate, 12 Proposition 23, 128 Public Broadcasting Station (PBS), 106 Public Service Company in Colorado, 199 Pugh, Lewis Gordon, 111 Purdue Universi
climate, 12 Proposition 23, 128 Public Broadcasting Station (PBS), 106 Public Service Company in Colorado, 199 Pugh, Lewis Gordon, 111 Purdue University, 174
(A) coordinate programs at the National Oceanic and Atmospheric Administration to ensure the timely production and distribution of data and information on global, national, regional, and local
climate variability and change over all time scales relevant
for planning and response, including intraseasonal, interannual,
decadal, and multidecadal time periods;
Roger could reply again by stating that models that don't show skill in projecting changing statistics can not be used
for this reasoning by simulation, but I remain to disgree with him: the skill of
climate models to project changing
climate statistics at
decadal time scales can formally not be established due to large role of natural variability, but is also not always required
for generating useful information that enters the imagination process.
Building on previous efforts, this three - day workshop will use the outcomes to guide synthesis efforts, coordinate on - going research to fill out key gaps, and provide specific recommendations
for accelerating scientific progress — with the aim to improve our understanding and predictability of 1) high - to mid-latitude
climate variability on subseasonal - to - seasonal and on interannual - to -
decadal timescales and 2)
climate extremes.
Guest Post by Willis Eschenbach The recent post here on WUWT about the Pacific
Decadal Oscillation (PDO) has a lot of folks claiming that the PDO is useful
for predicting the future of the
climate... I don't think so myself, and this post is about why I don't think the PDO predicts the
climate...
The 1998/2001
climate shift was to a cooler state with increased cloud cover — and these prominent
decadal modes last
for 20 to 40 years.
Pokrovsky (Main Geophysical Observatory, Russia); 4.9 Million Square Kilometers; Heuristic and Statistical September sea ice extent is predicted through analysis of three
climate indicators: the Atlantic Multidecadal Oscillation (AMO), Pacific
Decadal Oscillation (PDO), and Arctic Oscillation (AO)
for the last 30 years.
Charlie Skeptic does not believe in any of the explanations publicly given
for past
decadal, centennial and millennial Holocene
climate variations affecting the Earth as a whole.
Thus a conservative estimate
for the time taken to complete the LIA climatic shift to present - day
climate is about 10 years, suggesting the LIA termination in alpine regions of central North America may have occurred on a relatively short (
decadal) timescale.
The IPCC states that the modern warming
decadal warming, +0.55 °C, was at least 50 % caused by humans - thus, it is highly likely that natural
climate forces were responsible
for the other 50 %, say a +0.27 °C of the modern warming.
Modeling of the recent
decadal climate record would require careful accounting
for all of the radiative forcings, and would also require accurate modeling of ocean dynamics to accurately simulate the
climate system's response time.
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.
I ask
for a definition in part because you (Judith) seem to have defined «
climate services» as occurring on the «seasonal to
decadal time scale»... and things on that time scale in the past have always been called «weather».
«The authors write that North Pacific
Decadal Variability (NPDV) «is a key component in predictability studies of both regional and global
climate change,»... they emphasize that given the links between both the PDO and the NPGO with global
climate, the accurate characterization and the degree of predictability of these two modes in coupled
climate models is an important «open question in
climate dynamics» that needs to be addressed... report that model - derived «temporal and spatial statistics of the North Pacific Ocean modes exhibit significant discrepancies from observations in their twentieth - century
climate... conclude that «
for implications on future
climate change, the coupled
climate models show no consensus on projected future changes in frequency of either the first or second leading pattern of North Pacific SST anomalies,» and they say that «the lack of a consensus in changes in either mode also affects confidence in projected changes in the overlying atmospheric circulation.»»
The development of a fully coupled ocean - ice - atmosphere prediction system is a key issue
for a better Outlook and
for climate predictions on a
decadal time scale.