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BEGIN:VEVENT
SUMMARY:Michael Ghil (UCLA/ENS)
DTSTART:20201007T123000Z
DTEND:20201007T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/1
DESCRIPTION:Title: “How I got to love dynamical systems & their bifurcations”
\nby Michael Ghil (UCLA/ENS) as part of Perspectives on climate scienc
es: from historical developments to research frontiers\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shaun Lovejoy (McGill)
DTSTART:20201021T123000Z
DTEND:20201021T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/2
DESCRIPTION:Title: "Scaling\, fractals and the search for high level laws in weat
her\, macroweather and the climate"\nby Shaun Lovejoy (McGill) as part
of Perspectives on climate sciences: from historical developments to rese
arch frontiers\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tim Palmer (Univ. Oxford)
DTSTART:20201104T133000Z
DTEND:20201104T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/3
DESCRIPTION:Title: "Ensemble prediction"\nby Tim Palmer (Univ. Oxford) as par
t of Perspectives on climate sciences: from historical developments to res
earch frontiers\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hans von Storch (HZG)
DTSTART:20201118T133000Z
DTEND:20201118T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/4
DESCRIPTION:Title: “Climate science as a social process – history\, climatic
determinism\, CUDOS and post-normality“\nby Hans von Storch (HZG) as
part of Perspectives on climate sciences: from historical developments to
research frontiers\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cecile Penland (NOAA)
DTSTART:20201202T153000Z
DTEND:20201202T163000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/5
DESCRIPTION:Title: “Time and chance happeneth to them all: Stochastic processes
affecting life and nature”\nby Cecile Penland (NOAA) as part of Per
spectives on climate sciences: from historical developments to research fr
ontiers\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberto Benzi (UToV)
DTSTART:20201216T133000Z
DTEND:20201216T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/6
DESCRIPTION:Title: "The mechanism of stochastic resonance: how it was discovered
and why it is relevant in climate change"\nby Roberto Benzi (UToV) as
part of Perspectives on climate sciences: from historical developments to
research frontiers\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Brian Hoskins (Imperial College)
DTSTART:20210120T133000Z
DTEND:20210120T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/7
DESCRIPTION:Title: "Potential Vorticity"\nby Brian Hoskins (Imperial College)
as part of Perspectives on climate sciences: from historical developments
to research frontiers\n\n\nAbstract\nThe development the concepts of pote
ntial vorticity (PV) and quasi-geostrophic PV\, and their use by largely s
eparate academic communities will be traced. In my work on frontogenesis i
n about 1970\, I was able to bring them together in the context of simple
situations with uniform PV\, and this was later generalised in semi-geostr
ophic theory. With the availability of good quality global analyses from f
orecast centres\, dynamical ideas were immediately applicable to the under
standing of weather developments\, and our 1985 paper on Isentropic PV Map
s was written to advertise this. In the subsequent 35 years\, these maps a
nd those for potential temperature on a PV2 tropopause have become a gener
al resource. I am now using them to gain insight into tropical weather and
climate.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Susan Solomon (MIT)
DTSTART:20210203T153000Z
DTEND:20210203T163000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/8
DESCRIPTION:Title: "The Scientific And Policy Challenges Of The Antarctic Ozone H
ole: A Global Success Story"\nby Susan Solomon (MIT) as part of Perspe
ctives on climate sciences: from historical developments to research front
iers\n\n\nAbstract\nThe discovery of the Antarctic ozone hole shocked the
world in 1985 and contributed to remarkable changes in policy as well as i
n environmental science and public understanding. In\nthis talk\, I will r
eview key aspects of the history of ozone science. I will also summarize t
he roles of science\, public engagement\, international policy and technol
ogy in the\ninternational process that has effectively phased out the prod
uction of ozone-depleting\nchemicals. Finally\, I will discuss some of the
ways in which science continues to advance the understanding of ozone dep
letion chemistry as the ozone layer begins to heal.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kerry Emanuel (MIT)
DTSTART:20210210T133000Z
DTEND:20210210T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/9
DESCRIPTION:Title: "History of the Scientific Understanding of Hurricanes"\nb
y Kerry Emanuel (MIT) as part of Perspectives on climate sciences: from hi
storical developments to research frontiers\n\n\nAbstract\nSince their ide
ntification as rotating vortices\, in the early 19th century\, hurricanes
have been the subject of scientific scrutiny\, which waxes and wanes with
the occurrence of the destructive storms themselves. In this talk I will r
eview the rocky history of hurricane research including the development of
false ideas\, some of which persist to this day. I hope to provide a few
object lessons to students on the importance and hazards of received wisdo
m in beginning a career in science.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eugenia Kalnay (UMD)
DTSTART:20210224T133000Z
DTEND:20210224T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/10
DESCRIPTION:Title: "It's not just Climate Change"\nby Eugenia Kalnay (UMD) a
s part of Perspectives on climate sciences: from historical developments t
o research frontiers\n\n\nAbstract\nHow can we model Sustainability and im
prove Predictability in Earth System Models\, not just for Climate? We nee
d to bidirectionally couple (with feedbacks) Earth System models with Huma
n System models. In the real world\, the Human System has become the main
driver of change in the Earth System\, and these two systems are bidirecti
onally coupled. Therefore they should also be bidirectionally coupled in o
ur models. Such two-way dynamical coupled models will be more realistic\,
and their predictions more accurate. They are also needed to estimate the
impact of policies on Sustainability.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Ruelle (IHES)
DTSTART:20210303T133000Z
DTEND:20210303T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/11
DESCRIPTION:Title: "Chaos theory: the multidisciplinary origins"\nby David R
uelle (IHES) as part of Perspectives on climate sciences: from historical
developments to research frontiers\n\n\nAbstract\nClassical deterministic
time evolutions exist with apparent random features\, as is seen in hydrod
ynamic turbulence. Such phenomena have been called deterministic chaos\, a
nd are associated with sensitive dependence on initial conditions. We disc
uss chaos theory with emphasis on the multidisciplinary work concerning ch
aos in natural phenomena during the three decades 1970-2000. Work in that
period has involved developments in pure mathematics\, new experimental te
chniques\, and the use of digital computers. The problems addressed includ
e hydrodynamical turbulence\, meteorology\, chemical kinetics\, and the as
tronomy of the solar system. These problems can be handled with precision.
More general applications of deterministic chaos theory remain open.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pascale Braconnot (LSCE-IPSL)
DTSTART:20210317T133000Z
DTEND:20210317T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/12
DESCRIPTION:Title: "Paleoclimate modeling to test climate feedbacks and variabil
ity"\nby Pascale Braconnot (LSCE-IPSL) as part of Perspectives on clim
ate sciences: from historical developments to research frontiers\n\n\nAbst
ract\nThe paleoclimate modeling Intercomparison Project (PMIP) was launche
d in 1991 with the aim to better understand the mechanisms of climate chan
ges\, identify key feedbacks operating in the climate system and test the
ability of climate models to reproduce climate different from today. Durin
g the same period models have evolved from atmosphere models to Earth Syst
em models in which the energy\, the water and the carbon cycles interact\,
coupling the atmosphere\, the ocean\, the land surface and the ice not on
ly through dynamic and thermodynamic processes\, but also through biogeoch
emical processes. \n\nDuring this seminar I will discuss how the different
phases of PMIP have helped to discuss climate sensitivity\, different fee
dbacks affecting monsoon changes in the tropics and the linkage between in
terannual variability and changes in the climate mean state. I will highli
ght the new steps that were possible thanks to new model developments and
comparisons with paleoclimate reconstructions. I will also discuss uncerta
inties and the confidence past climate simulations provide on the results
of future climate projections.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Berengere Dubrulle (LSCE-IPSL)
DTSTART:20210324T133000Z
DTEND:20210324T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/13
DESCRIPTION:Title: "On the concept of energy cascades in turbulence: from Richar
dson/Kolmogorov picture to multifractal and beyond"\nby Berengere Dubr
ulle (LSCE-IPSL) as part of Perspectives on climate sciences: from histori
cal developments to research frontiers\n\n\nAbstract\nTurbulent flows are
characterized by a self-similar energy spectrum\, signature of fluid movem
ents at all scales. This organization has been described for more than 70
years by the phenomenology of "Kolmogorov/Richardson cascade": the energy
injected on a large scale by the work of the force that moves the fluid (e
.g. a turbine) is transferred to smaller and smaller scales with a constan
t dissipation rate\, up to the Kolmogorov scale\, where it is transformed
into heat and dissipated by viscosity. Such cascade phenomenology is at th
e basis of most turbulent models.\n\nI will discuss in this talk how progr
esses in numerical simulations and laboratory experiments gradually change
d such simple vision (starting from Landau objection in the 50's)\, leadin
g to a new picture where quasi-singularities living beyond Kolmogorov scal
e play a central role. This has important impact on resolution requirement
of numerical simulations and call for new models of turbulence.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giovanni Jona-Lasinio (Sapienza)
DTSTART:20210331T123000Z
DTEND:20210331T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/14
DESCRIPTION:Title: "Understanding non-equilibrium via macroscopic fluctuations"<
/a>\nby Giovanni Jona-Lasinio (Sapienza) as part of Perspectives on climat
e sciences: from historical developments to research frontiers\n\n\nAbstra
ct\nIn non-equilibrium there is an enormous variety of phenomena so we can
not hope to formulate a unique theory having a generality comparable to cl
assical thermodynamics. We have to restrict to subclasses of problems. One
difficulty is to define suitable thermodynamic functionals in far from eq
uilibrium situations. Large fluctuations offer a way out as large deviatio
n rates provide\, via variational principles\, genuine thermodynamic funct
ionals. Singularities of these functionals describe new types of phase tra
nsitions.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Klaus Hasselmann (MPI-M)
DTSTART:20210127T133000Z
DTEND:20210127T143000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/15
DESCRIPTION:Title: "Klaus Hasselmann's perspectives on climate sciences: an inte
rview"\nby Klaus Hasselmann (MPI-M) as part of Perspectives on climate
sciences: from historical developments to research frontiers\n\nAbstract:
TBA\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Clara Deser (NCAR)
DTSTART:20210512T143000Z
DTEND:20210512T153000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/16
DESCRIPTION:Title: "New Perspectives on the Role of Internal Variability in Regi
onal Climate Change and Climate"\nby Clara Deser (NCAR) as part of Per
spectives on climate sciences: from historical developments to research fr
ontiers\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Valerie Trouet (University of Arizona)
DTSTART:20210519T143000Z
DTEND:20210519T153000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/17
DESCRIPTION:Title: "A paleoclimate perspective on large-scale climate dynamics"<
/a>\nby Valerie Trouet (University of Arizona) as part of Perspectives on
climate sciences: from historical developments to research frontiers\n\n\n
Abstract\nWe use paleoclimate proxies\, biological and geological archives
that record past climatic conditions\, to study natural climate variabili
ty and to put current and future climatic changes in a long-term context.
Climate history of the past ~1\,000 years is of particular interest\, beca
use it allows us to look at policy-relevant (decadal to centennial) time-s
cales and to link climate history to the best-documented period of human h
istory. Tree rings are the most widely used climate proxy to study recent
climate history and a century of dendrochronological research has resulted
in a broad network of tree-ring chronologies that allows us to study the
drivers of continental- to hemispheric-scale climate dynamical patterns ov
er multiple centuries. \nHere\, I will present two studies in which we use
d tree-ring data to reconstruct long-term variability in the position of t
he jet stream over (1) the North Atlantic and (2) the North Pacific. I wil
l discuss what our reconstructions tell us about past variability in these
climate patterns\, how they are linked to ecosystem and human history\, i
ncluding wildfires\, and why this information is important for future clim
ate research.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Raymond Pierrehumbert (University of Oxford)
DTSTART:20210602T123000Z
DTEND:20210602T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/18
DESCRIPTION:Title: "A journey from GFD to exoplanets\, with snowballs and global
warming along the way"\nby Raymond Pierrehumbert (University of Oxfor
d) as part of Perspectives on climate sciences: from historical developmen
ts to research frontiers\n\n\nAbstract\nThe richness of behaviour of clima
te systems is an emergent property of the interaction of a relatively smal
l number of components governed by well-established fundamental physical l
aws. For atmospheres the core components are Newtonian mechanics\, thermod
ynamics and radiative transfer. Oceans can be largely regarded as a dense
form of atmosphere\, and indeed for many planetary atmospheres there is no
clear distinction between "atmosphere-like" and "ocean-like" behaviour.
As one broadens the field of inquiry to include origins and evolution of a
tmospheres and their associated climates\, additional components are engag
ed\, including atmospheric chemistry\, geochemistry\, crustal processes an
d the planetary interior processes that govern what is outgassed into the
atmosphere. In this lecture I will give some examples of the ways the fund
amental building blocks of climate have given rise to diverse behaviour in
a selection of the climate physics problems I have engaged with\, buildin
g outwards from idealized fluid mechanical problems to my current obsessio
n with exoplanets. In the course of this exploration\, I hope to provide a
small tribute to the many people from whom I have learned over the years.
A key emerging theme is that a certain amount of stochastic forcing is go
od for one's intellectual development.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ken Golden (University of Utah)
DTSTART:20210609T123000Z
DTEND:20210609T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/19
DESCRIPTION:Title: "On Thinning Ice: Modeling sea ice in a warming climate"\
nby Ken Golden (University of Utah) as part of Perspectives on climate sci
ences: from historical developments to research frontiers\n\n\nAbstract\nP
olar sea ice is a key component of Earth’s climate system. As a material
it exhibits complex composite structure on length scales ranging from ten
ths of millimeters to tens of kilometers. A principal challenge in modelin
g sea ice and its role in climate is how to use information on small scale
structure to find the effective or homogenized properties on larger scale
s relevant to coarse-grained climate models. In other words\, how do you p
redict macroscopic behavior from microscopic laws? Similar questions arise
in statistical mechanics\, materials science\, and many other areas of sc
ience and engineering. In this talk I will give an overview of recent resu
lts\, inspired by theories of composite materials and statistical physics\
, on modeling effective behavior in the sea ice system over a broad range
of scales. We consider fluid and electromagnetic transport through the bri
ne and polycrystalline microstructure\, advection diffusion processes\, oc
ean wave propagation through the ice pack\, and the evolution of melt pond
s on the surface of Arctic sea ice. We will also discuss how sea ice physi
cal processes influence microbial communities living in the ice and upper
ocean\, and vice versa. This work is helping to advance how sea ice is rep
resented in climate models\, and to improve projections of the fate of Ear
th’s sea ice packs and the ecosystems they support.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:James Yorke (UMD)
DTSTART:20210616T123000Z
DTEND:20210616T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/20
DESCRIPTION:Title: "Small dynamic models to understand large models"\nby Jam
es Yorke (UMD) as part of Perspectives on climate sciences: from historica
l developments to research frontiers\n\n\nAbstract\nI will discuss a varie
ty of models emphasizing small models in dynamical systems\, and I will re
late them to high dimensional models.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gabriele Hegerl (University of Edinburgh)
DTSTART:20210623T123000Z
DTEND:20210623T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/21
DESCRIPTION:Title: "The detection and attribution of anthropogenic climate chang
e"\nby Gabriele Hegerl (University of Edinburgh) as part of Perspectiv
es on climate sciences: from historical developments to research frontiers
\n\n\nAbstract\nThis talk discusses the history of detection of climate ch
ange\, starting with a string of similar papers setting out a methodology
for early detection of climate change in noisy data by Bell\, Hasselmann a
nd North. I will discuss its first applications by a small group of scient
ists which lead to the conclusion of a 'discernible' human impact on clima
te. These results have since strengthened by quantifying the contribution
by greenhouse gas and aerosol influences to the historical temperature rec
ord\, and moving to its detection in precipitation\, water vapour\, satell
ite temperature and even attempts at circulation change detection. I will
also discuss the role the record of the last millennium has played in this
discussion\, and the public perception of this detection of climate chang
e. Recently\, attribution has been broadened to discussing individual even
ts\, which is related to attribution of longterm change yet with important
differences.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Denisse Sciamarella (CIMA-FCEN)
DTSTART:20210707T123000Z
DTEND:20210707T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/22
DESCRIPTION:Title: "Topology of Chaos"\nby Denisse Sciamarella (CIMA-FCEN) a
s part of Perspectives on climate sciences: from historical developments t
o research frontiers\n\n\nAbstract\nPackard et al. (1980) first attempted
to identify the key features of a dynamical system from observational or e
xperimental data. They used time series to reconstruct a finite-dimensiona
l phase-space picture of the sampled system's time evolution within an emb
edding space\, and to characterize it geometrically. Topological propertie
s can replace geometrical ones and have the advantage of providing informa
tion about the mechanisms that act in phase space to generate the flow. Th
ese mechanisms — stretching\, squeezing\, tearing\, and folding — are
topological in nature\, and they are intimately related to the governing e
quations. The duality of dynamics and topology opens several doors. In the
deterministic realm\, it can provide clear-cut definitions of categories
such as “coherence” and “regime.” Recent research shows\, for inst
ance\, how to rely on topological tools to unravel coherent sets from spar
se data in fluid flows. These tools can also help validate\, emulate or re
fute models from data\, as well as in comparing data sets. Enlightening su
rprises arise if one takes one step beyond\, and extends the topological p
erspective to random dynamical systems\, which provide the appropriate mat
hematical framework to tackle ocean–atmosphere coupling and climate chan
ge. Noise modifies the behavior of a random attractor: at each instant in
time\, though\, the random attractor’s structure is still well represent
ed by a branched manifold\, defined as an integer-dimensional subset of ph
ase space that supports the invariant sample measure. Different “stages
” in the “life” of a random attractor can be identified by monitorin
g the abrupt changes of the branched manifold’s topology. These findings
hold promise for the understanding of the climate system’s “tipping p
oints” in unprecedented ways. This talk will present joint work with Gis
ela Charó\, Mickaël Chekroun and Michael Ghil.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Mann (PSU)
DTSTART:20210714T123000Z
DTEND:20210714T133000Z
DTSTAMP:20260422T225924Z
UID:PerspectivesClimate/23
DESCRIPTION:Title: "The rise and fall of Atlantic Multidecadal Oscillation"\
nby Michael Mann (PSU) as part of Perspectives on climate sciences: from h
istorical developments to research frontiers\n\n\nAbstract\nFor several de
cades the existence of interdecadal and multidecadal internal climate osci
llations has been asserted by numerous studies based on analyses of histor
ical observations\, paleoclimatic data and climate model simulations. We u
se a combination of observational data and state-of-the-art forced and con
trol climate model simulations to demonstrate the absence of consistent ev
idence for decadal or longer-term internal oscillatory signals that are di
stinguishable from climatic noise. Only variability in the interannual ran
ge associated with the El Niño/Southern Oscillation is found to be distin
guishable from the noise background. A distinct (40–50 year timescale) s
pectral peak that appears in global surface temperature observations appea
rs to reflect the response of the climate system to both anthropogenic and
natural forcing rather than any intrinsic internal oscillation. These fin
dings have implications both for the validity of previous studies attribut
ing certain long-term climate trends (e.g. in Atlantic hurricane activity)
to internal low-frequency climate cycles and for prospects for decadal cl
imate predictability.\n
LOCATION:https://researchseminars.org/talk/PerspectivesClimate/23/
END:VEVENT
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