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BEGIN:VEVENT
SUMMARY:Michael Ghil (UCLA/ENS)
DTSTART:20201007T123000Z
DTEND:20201007T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/1
DESCRIPTION:Title: “How I got to love dynamical systems & their bifurcat
ions”\nby Michael Ghil (UCLA/ENS) as part of Perspectives on climate
sciences: from historical developments to research frontiers\n\nAbstract:
TBA\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shaun Lovejoy (McGill)
DTSTART:20201021T123000Z
DTEND:20201021T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/2
DESCRIPTION:Title: "Scaling\, fractals and the search for high level laws
in weather\, macroweather and the climate"\nby Shaun Lovejoy (McGill)
as part of Perspectives on climate sciences: from historical developments
to research frontiers\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tim Palmer (Univ. Oxford)
DTSTART:20201104T133000Z
DTEND:20201104T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/3
DESCRIPTION:Title: "Ensemble prediction"\nby Tim Palmer (Univ. Oxford)
as part of Perspectives on climate sciences: from historical developments
to research frontiers\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hans von Storch (HZG)
DTSTART:20201118T133000Z
DTEND:20201118T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/4
DESCRIPTION:Title: “Climate science as a social process – history\, cl
imatic determinism\, CUDOS and post-normality“\nby Hans von Storch (
HZG) as part of Perspectives on climate sciences: from historical developm
ents to research frontiers\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cecile Penland (NOAA)
DTSTART:20201202T153000Z
DTEND:20201202T163000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/5
DESCRIPTION:Title: “Time and chance happeneth to them all: Stochastic pr
ocesses affecting life and nature”\nby Cecile Penland (NOAA) as part
of Perspectives on climate sciences: from historical developments to rese
arch frontiers\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberto Benzi (UToV)
DTSTART:20201216T133000Z
DTEND:20201216T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/6
DESCRIPTION:Title: "The mechanism of stochastic resonance: how it was disc
overed and why it is relevant in climate change"\nby Roberto Benzi (UT
oV) as part of Perspectives on climate sciences: from historical developme
nts to research frontiers\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Brian Hoskins (Imperial College)
DTSTART:20210120T133000Z
DTEND:20210120T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/7
DESCRIPTION:Title: "Potential Vorticity"\nby Brian Hoskins (Imperial C
ollege) as part of Perspectives on climate sciences: from historical devel
opments to research frontiers\n\n\nAbstract\nThe development the concepts
of potential vorticity (PV) and quasi-geostrophic PV\, and their use by la
rgely separate academic communities will be traced. In my work on frontoge
nesis in 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
-geostrophic theory. With the availability of good quality global analyses
from forecast centres\, dynamical ideas were immediately applicable to th
e understanding of weather developments\, and our 1985 paper on Isentropic
PV Maps was written to advertise this. In the subsequent 35 years\, these
maps and those for potential temperature on a PV2 tropopause have become
a general resource. I am now using them to gain insight into tropical weat
her and climate.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Susan Solomon (MIT)
DTSTART:20210203T153000Z
DTEND:20210203T163000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/8
DESCRIPTION:Title: "The Scientific And Policy Challenges Of The Antarctic
Ozone Hole: A Global Success Story"\nby Susan Solomon (MIT) as part of
Perspectives on climate sciences: from historical developments to researc
h frontiers\n\n\nAbstract\nThe discovery of the Antarctic ozone hole shock
ed the world in 1985 and contributed to remarkable changes in policy as we
ll as in environmental science and public understanding. In\nthis talk\, I
will review key aspects of the history of ozone science. I will also summ
arize the roles of science\, public engagement\, international policy and
technology in the\ninternational process that has effectively phased out t
he production of ozone-depleting\nchemicals. Finally\, I will discuss some
of the ways in which science continues to advance the understanding of oz
one depletion chemistry as the ozone layer begins to heal.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kerry Emanuel (MIT)
DTSTART:20210210T133000Z
DTEND:20210210T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/9
DESCRIPTION:Title: "History of the Scientific Understanding of Hurricanes"
\nby Kerry Emanuel (MIT) as part of Perspectives on climate sciences:
from historical developments to research frontiers\n\n\nAbstract\nSince th
eir identification as rotating vortices\, in the early 19th century\, hurr
icanes have been the subject of scientific scrutiny\, which waxes and wane
s with the occurrence of the destructive storms themselves. In this talk I
will review the rocky history of hurricane research including the develop
ment 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 receive
d wisdom in beginning a career in science.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eugenia Kalnay (UMD)
DTSTART:20210224T133000Z
DTEND:20210224T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/10
DESCRIPTION:Title: "It's not just Climate Change"\nby Eugenia Kalnay
(UMD) as part of Perspectives on climate sciences: from historical develop
ments to research frontiers\n\n\nAbstract\nHow can we model Sustainability
and improve Predictability in Earth System Models\, not just for Climate?
We need to bidirectionally couple (with feedbacks) Earth System models wi
th Human System models. In the real world\, the Human System has become th
e main driver of change in the Earth System\, and these two systems are bi
directionally coupled. Therefore they should also be bidirectionally coupl
ed in our models. Such two-way dynamical coupled models will be more reali
stic\, and their predictions more accurate. They are also needed to estima
te the impact of policies on Sustainability.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Ruelle (IHES)
DTSTART:20210303T133000Z
DTEND:20210303T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/11
DESCRIPTION:Title: "Chaos theory: the multidisciplinary origins"\nby
David Ruelle (IHES) as part of Perspectives on climate sciences: from hist
orical developments to research frontiers\n\n\nAbstract\nClassical determi
nistic time evolutions exist with apparent random features\, as is seen in
hydrodynamic turbulence. Such phenomena have been called deterministic ch
aos\, and are associated with sensitive dependence on initial conditions.
We discuss chaos theory with emphasis on the multidisciplinary work concer
ning chaos in natural phenomena during the three decades 1970-2000. Work i
n that period has involved developments in pure mathematics\, new experime
ntal techniques\, and the use of digital computers. The problems addressed
include hydrodynamical turbulence\, meteorology\, chemical kinetics\, and
the astronomy of the solar system. These problems can be handled with pre
cision. More general applications of deterministic chaos theory remain ope
n.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pascale Braconnot (LSCE-IPSL)
DTSTART:20210317T133000Z
DTEND:20210317T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/12
DESCRIPTION:Title: "Paleoclimate modeling to test climate feedbacks and v
ariability"\nby Pascale Braconnot (LSCE-IPSL) as part of Perspectives
on climate sciences: from historical developments to research frontiers\n\
n\nAbstract\nThe paleoclimate modeling Intercomparison Project (PMIP) was
launched in 1991 with the aim to better understand the mechanisms of clima
te changes\, identify key feedbacks operating in the climate system and te
st the ability of climate models to reproduce climate different from today
. During the same period models have evolved from atmosphere models to Ear
th System models in which the energy\, the water and the carbon cycles int
eract\, coupling the atmosphere\, the ocean\, the land surface and the ice
not only through dynamic and thermodynamic processes\, but also through b
iogeochemical processes. \n\nDuring this seminar I will discuss how the di
fferent phases of PMIP have helped to discuss climate sensitivity\, differ
ent feedbacks affecting monsoon changes in the tropics and the linkage bet
ween interannual variability and changes in the climate mean state. I will
highlight the new steps that were possible thanks to new model developmen
ts and comparisons with paleoclimate reconstructions. I will also discuss
uncertainties and the confidence past climate simulations provide on the r
esults of future climate projections.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Berengere Dubrulle (LSCE-IPSL)
DTSTART:20210324T133000Z
DTEND:20210324T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/13
DESCRIPTION:Title: "On the concept of energy cascades in turbulence: from
Richardson/Kolmogorov picture to multifractal and beyond"\nby Berenge
re Dubrulle (LSCE-IPSL) as part of Perspectives on climate sciences: from
historical developments to research frontiers\n\n\nAbstract\nTurbulent flo
ws are characterized by a self-similar energy spectrum\, signature of flui
d movements at all scales. This organization has been described for more t
han 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 f
luid (e.g. a turbine) is transferred to smaller and smaller scales with a
constant dissipation rate\, up to the Kolmogorov scale\, where it is trans
formed into heat and dissipated by viscosity. Such cascade phenomenology i
s at the basis of most turbulent models.\n\nI will discuss in this talk ho
w progresses in numerical simulations and laboratory experiments gradually
changed such simple vision (starting from Landau objection in the 50's)\,
leading to a new picture where quasi-singularities living beyond Kolmogor
ov scale play a central role. This has important impact on resolution requ
irement of numerical simulations and call for new models of turbulence.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giovanni Jona-Lasinio (Sapienza)
DTSTART:20210331T123000Z
DTEND:20210331T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/14
DESCRIPTION:Title: "Understanding non-equilibrium via macroscopic fluctua
tions"\nby Giovanni Jona-Lasinio (Sapienza) as part of Perspectives on
climate sciences: from historical developments to research frontiers\n\n\
nAbstract\nIn non-equilibrium there is an enormous variety of phenomena so
we cannot hope to formulate a unique theory having a generality comparabl
e to classical thermodynamics. We have to restrict to subclasses of proble
ms. One difficulty is to define suitable thermodynamic functionals in far
from equilibrium situations. Large fluctuations offer a way out as large d
eviation rates provide\, via variational principles\, genuine thermodynami
c functionals. Singularities of these functionals describe new types of ph
ase transitions.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Klaus Hasselmann (MPI-M)
DTSTART:20210127T133000Z
DTEND:20210127T143000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/15
DESCRIPTION:Title: "Klaus Hasselmann's perspectives on climate sciences:
an interview"\nby Klaus Hasselmann (MPI-M) as part of Perspectives on
climate sciences: from historical developments to research frontiers\n\nAb
stract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Clara Deser (NCAR)
DTSTART:20210512T143000Z
DTEND:20210512T153000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/16
DESCRIPTION:Title: "New Perspectives on the Role of Internal Variability
in Regional Climate Change and Climate"\nby Clara Deser (NCAR) as part
of Perspectives on climate sciences: from historical developments to rese
arch frontiers\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Valerie Trouet (University of Arizona)
DTSTART:20210519T143000Z
DTEND:20210519T153000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/17
DESCRIPTION:Title: "A paleoclimate perspective on large-scale climate dyn
amics"\nby Valerie Trouet (University of Arizona) as part of Perspecti
ves on climate sciences: from historical developments to research frontier
s\n\n\nAbstract\nWe use paleoclimate proxies\, biological and geological a
rchives that record past climatic conditions\, to study natural climate va
riability and to put current and future climatic changes in a long-term co
ntext. Climate history of the past ~1\,000 years is of particular interest
\, because it allows us to look at policy-relevant (decadal to centennial)
time-scales and to link climate history to the best-documented period of
human history. Tree rings are the most widely used climate proxy to study
recent climate history and a century of dendrochronological research has r
esulted in a broad network of tree-ring chronologies that allows us to stu
dy the drivers of continental- to hemispheric-scale climate dynamical patt
erns over multiple centuries. \nHere\, I will present two studies in which
we used tree-ring data to reconstruct long-term variability in the positi
on of the jet stream over (1) the North Atlantic and (2) the North Pacific
. I will discuss what our reconstructions tell us about past variability i
n these climate patterns\, how they are linked to ecosystem and human hist
ory\, including wildfires\, and why this information is important for futu
re climate research.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Raymond Pierrehumbert (University of Oxford)
DTSTART:20210602T123000Z
DTEND:20210602T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/18
DESCRIPTION:Title: "A journey from GFD to exoplanets\, with snowballs and
global warming along the way"\nby Raymond Pierrehumbert (University o
f Oxford) as part of Perspectives on climate sciences: from historical dev
elopments to research frontiers\n\n\nAbstract\nThe richness of behaviour o
f climate systems is an emergent property of the interaction of a relative
ly small number of components governed by well-established fundamental phy
sical laws. For atmospheres the core components are Newtonian mechanics\,
thermodynamics and radiative transfer. Oceans can be largely regarded as a
dense form of atmosphere\, and indeed for many planetary atmospheres ther
e is no clear distinction between "atmosphere-like" and "ocean-like" behav
iour. As one broadens the field of inquiry to include origins and evoluti
on of atmospheres and their associated climates\, additional components ar
e engaged\, including atmospheric chemistry\, geochemistry\, crustal proce
sses and the planetary interior processes that govern what is outgassed in
to the atmosphere. In this lecture I will give some examples of the ways t
he fundamental building blocks of climate have given rise to diverse behav
iour in a selection of the climate physics problems I have engaged with\,
building outwards from idealized fluid mechanical problems to my current o
bsession with exoplanets. In the course of this exploration\, I hope to pr
ovide 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 forcin
g is good for one's intellectual development.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ken Golden (University of Utah)
DTSTART:20210609T123000Z
DTEND:20210609T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/19
DESCRIPTION:Title: "On Thinning Ice: Modeling sea ice in a warming climat
e"\nby Ken Golden (University of Utah) as part of Perspectives on clim
ate sciences: from historical developments to research frontiers\n\n\nAbst
ract\nPolar sea ice is a key component of Earth’s climate system. As a m
aterial it exhibits complex composite structure on length scales ranging f
rom tenths of millimeters to tens of kilometers. A principal challenge in
modeling sea ice and its role in climate is how to use information on smal
l scale structure to find the effective or homogenized properties on large
r scales relevant to coarse-grained climate models. In other words\, how d
o you predict macroscopic behavior from microscopic laws? Similar question
s arise in statistical mechanics\, materials science\, and many other area
s of science and engineering. In this talk I will give an overview of rece
nt results\, inspired by theories of composite materials and statistical p
hysics\, on modeling effective behavior in the sea ice system over a broad
range of scales. We consider fluid and electromagnetic transport through
the brine and polycrystalline microstructure\, advection diffusion process
es\, ocean wave propagation through the ice pack\, and the evolution of me
lt ponds on the surface of Arctic sea ice. We will also discuss how sea ic
e physical processes influence microbial communities living in the ice and
upper ocean\, and vice versa. This work is helping to advance how sea ice
is represented in climate models\, and to improve projections of the fate
of Earth’s sea ice packs and the ecosystems they support.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:James Yorke (UMD)
DTSTART:20210616T123000Z
DTEND:20210616T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/20
DESCRIPTION:Title: "Small dynamic models to understand large models"\
nby James Yorke (UMD) as part of Perspectives on climate sciences: from hi
storical developments to research frontiers\n\n\nAbstract\nI will discuss
a variety of models emphasizing small models in dynamical systems\, and I
will relate them to high dimensional models.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gabriele Hegerl (University of Edinburgh)
DTSTART:20210623T123000Z
DTEND:20210623T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/21
DESCRIPTION:Title: "The detection and attribution of anthropogenic climat
e change"\nby Gabriele Hegerl (University of Edinburgh) as part of Per
spectives on climate sciences: from historical developments to research fr
ontiers\n\n\nAbstract\nThis talk discusses the history of detection of cli
mate change\, starting with a string of similar papers setting out a metho
dology for early detection of climate change in noisy data by Bell\, Hasse
lmann and North. I will discuss its first applications by a small group of
scientists which lead to the conclusion of a 'discernible' human impact o
n climate. These results have since strengthened by quantifying the contri
bution by greenhouse gas and aerosol influences to the historical temperat
ure record\, and moving to its detection in precipitation\, water vapour\,
satellite 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 climat
e change. Recently\, attribution has been broadened to discussing individu
al events\, which is related to attribution of longterm change yet with im
portant differences.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Denisse Sciamarella (CIMA-FCEN)
DTSTART:20210707T123000Z
DTEND:20210707T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/22
DESCRIPTION:Title: "Topology of Chaos"\nby Denisse Sciamarella (CIMA-
FCEN) as part of Perspectives on climate sciences: from historical develop
ments to research frontiers\n\n\nAbstract\nPackard et al. (1980) first att
empted to identify the key features of a dynamical system from observation
al or experimental data. They used time series to reconstruct a finite-dim
ensional phase-space picture of the sampled system's time evolution within
an embedding space\, and to characterize it geometrically. Topological pr
operties can replace geometrical ones and have the advantage of providing
information about the mechanisms that act in phase space to generate the f
low. These mechanisms — stretching\, squeezing\, tearing\, and folding
— are topological in nature\, and they are intimately related to the gov
erning equations. The duality of dynamics and topology opens several doors
. In the deterministic realm\, it can provide clear-cut definitions of cat
egories such as “coherence” and “regime.” Recent research shows\,
for instance\, how to rely on topological tools to unravel coherent sets f
rom sparse data in fluid flows. These tools can also help validate\, emula
te or refute models from data\, as well as in comparing data sets. Enlight
ening surprises arise if one takes one step beyond\, and extends the topol
ogical perspective to random dynamical systems\, which provide the appropr
iate mathematical framework to tackle ocean–atmosphere coupling and clim
ate change. Noise modifies the behavior of a random attractor: at each ins
tant in time\, though\, the random attractor’s structure is still well r
epresented by a branched manifold\, defined as an integer-dimensional subs
et of phase space that supports the invariant sample measure. Different
“stages” in the “life” of a random attractor can be identified by
monitoring the abrupt changes of the branched manifold’s topology. These
findings hold promise for the understanding of the climate system’s “
tipping points” in unprecedented ways. This talk will present joint work
with Gisela Charó\, Mickaël Chekroun and Michael Ghil.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Mann (PSU)
DTSTART:20210714T123000Z
DTEND:20210714T133000Z
DTSTAMP:20260404T110829Z
UID:PerspectivesClimate/23
DESCRIPTION:Title: "The rise and fall of Atlantic Multidecadal Oscillatio
n"\nby Michael Mann (PSU) as part of Perspectives on climate sciences:
from historical developments to research frontiers\n\n\nAbstract\nFor sev
eral decades the existence of interdecadal and multidecadal internal clima
te oscillations has been asserted by numerous studies based on analyses of
historical observations\, paleoclimatic data and climate model simulation
s. We use a combination of observational data and state-of-the-art forced
and control climate model simulations to demonstrate the absence of consis
tent evidence for decadal or longer-term internal oscillatory signals that
are distinguishable from climatic noise. Only variability in the interann
ual range associated with the El Niño/Southern Oscillation is found to be
distinguishable from the noise background. A distinct (40–50 year times
cale) spectral peak that appears in global surface temperature observation
s appears to reflect the response of the climate system to both anthropoge
nic and natural forcing rather than any intrinsic internal oscillation. Th
ese findings have implications both for the validity of previous studies a
ttributing certain long-term climate trends (e.g. in Atlantic hurricane ac
tivity) to internal low-frequency climate cycles and for prospects for dec
adal climate predictability.\n
LOCATION:https://stable.researchseminars.org/talk/PerspectivesClimate/23/
END:VEVENT
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