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Norbert Marwan

Norbert Marwan

@pucicu.de

240 followers 86 following 220 posts

cave researcher, scientist at PIK, nonlinear data analysis, underwater rugby player

https://www.pik-potsdam.de/~marwan

Environmental science 23%

Physics 20%

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Posts Replies Media Videos

Norbert Marwan @pucicu.de · 3d

Next CTCS webinar next Monday, Nov 24, 2025, 8:30 PM to 10:00 PM IST, 4:00 PM to 05:30 PM CET

Prof. Balakumar Balachandran from the University of Maryland, will talk about "Can noise be used to realize the desired dynamics?"
us06web.zoom.us/webinar/regi...
ctcs.iitm.ac.in/ctcs-webinar

Reposted by Norbert Marwan

kaltluftseen.ch @kryophil.bsky.social · 3d

Hintergräppelen hat sich mittlerweile aus dem Würgegriff des Hochnebels befreit und versucht, mit -6 °C/h Terrain gut zu machen. Die Bilder von saentis.roundshot.com (roter Pfeil: ungefähre Lage von Hintergräppelen) zeigen den Einfluss des Hochnebels.
(Zeit in der Graphik = UTC, Zeit Webcam = MEWZ)

Reposted by Norbert Marwan

kaltluftseen.ch @kryophil.bsky.social · 3d

-35 °C sind auch im Kasten - alles, was jetzt noch kommt, ist Zugabe… kaltluftseen.ch/saegistalsee...

Reposted by Norbert Marwan

Wolf Maahn @wolfmaahn.bsky.social · 6d

Unser Kulturbotschafter aus dem Sauerland zeigt Brasilien, wie man richtig groovy tanzt.

Reposted by Norbert Marwan

PIK_climate @pik-potsdam.bsky.social · 6d

Congratulations to PIK scientist Sara Vallejo-Bernal! 🎉 She won the Outstanding Student and PhD Candidate Presentation Award 2025 from the European Geosciences Union’s Atmospheric Sciences division for her presentation on atmospheric rivers in North America: www.egu.eu/awards-medal... #EGU25

Norbert Marwan @pucicu.de · 7d

Our partner from Federal University of Paraná (Curitiba) developed a fast #Julia package for microstate analysis of #recurrence_plot
doi.org/10.1063/5.02...

RecurrenceMicrostatesAnalysis.jl: A Julia library for analyzing dynamical systems with recurrence microstates

Recurrence Quantification Analysis (RQA) has become a standard tool for extracting nonlinear characteristics from time series. It relies on specific recurrence

Reposted by Norbert Marwan

Recurrence Plots @recurrence-plot.tk · 7d

New #Julia package for microstate analysis of #recurrence_plot
doi.org/10.1063/5.02...

RecurrenceMicrostatesAnalysis.jl: A Julia library for analyzing dynamical systems with recurrence microstates

Recurrence Quantification Analysis (RQA) has become a standard tool for extracting nonlinear characteristics from time series. It relies on specific recurrence

Reposted by Norbert Marwan

Stefan Krauter @solarpapst.bsky.social · 10d

Mit "technologieoffen" ist nicht wirklich technogieoffen gemeint, sondern: Wir wollen keinen #Klimaschutz machen.

Reposted by Norbert Marwan

Seb Breitenbach @speleoseb.bsky.social · 13d

The #UN today proclaimed The International Day of Caves and Karst! To be celebrated 13th September 2026 for the first time! 😍 @mariabox.bsky.social @pucicu.de @olakwiecien3.bsky.social

unesdoc.unesco.org/ark:/48223/p...

International Day of Caves and Karst

UNESCO Digital Library

unesdoc.unesco.org

Reposted by Norbert Marwan

Prof. R. I. Sujith @risujith.bsky.social · 13d

This month, CTCS (IIT Madras) & @pik-potsdam.bsky.social present a webinar:
📢: Can noise be used to realize the desired dynamics?
🎙️: Prof. Balakumar Balachandran, @univofmaryland.bsky.social, USA
📅: November 24| ⏰20:30 IST | 16:00 CET
🔗: us06web.zoom.us/webinar/regi...
#Complexsystems #phd

Reposted by Norbert Marwan

Prof. Anders Levermann, PhD @alevermann.bsky.social · 18d

...das bedeutet: Wer das Pariser Klimaabkommen aufgibt, gibt Hamburg auf... New York, Shanghai, Kalkutta,...

Reposted by Norbert Marwan

Seb Breitenbach @speleoseb.bsky.social · 28d

Interested in #uranium isotopes and their potential use as #redox proxy in karst systems? Looking for a PhD project or know someone who might? DM me for more details! ☢️ @mariabox.bsky.social @pucicu.de @bgs.ac.uk @tinyicybubbles.bsky.social @olakwiecien3.bsky.social

Reposted by Norbert Marwan

Prof. Stefan Rahmstorf @rahmstorf.bsky.social · 28d

Wissenschaft ist kein Wunschkonzert der Reichen und Mächtigen, die missliebige Forschung - etwa die Klimaforschung - am liebsten abschaffen und unterdrücken wollen. Deshalb habe ich das Hamburger Manifest unterschrieben. Es ist auch ein Appell an Forscherkollegen.
Hier ist es: openpetition.de/!hcbrf

Reposted by Norbert Marwan

Recurrence Plots @recurrence-plot.tk · Oct 27

Joint #recurrence_plot used to investigate connectivity within human brain's connectome: link.springer.com/article/10.1...

K-operator for Modelling Neurodegeneration: Simulations, fMRI Application, Eigenvalue Analysis and Recurrence Plots - Journal of Medical Systems

The brain network damage provoked by a neurological disease can be modelled as the result of the action of an operator, K, acting on the brain, inspired by physics. Here, we explore the matrix formula...

link.springer.com

Norbert Marwan @pucicu.de · Oct 27

Another study using the novel K-operator concept by @[email protected] just published in the Journal of Medical Systems link.springer.com/article/10.1...

K-operator for Modelling Neurodegeneration: Simulations, fMRI Application, Eigenvalue Analysis and Recurrence Plots - Journal of Medical Systems

The brain network damage provoked by a neurological disease can be modelled as the result of the action of an operator, K, acting on the brain, inspired by physics. Here, we explore the matrix formula...

link.springer.com

Reposted by Norbert Marwan

kaltluftseen.ch @kryophil.bsky.social · Oct 26

Aktuell liegen im Berner Oberland auf 2000 m 10 bis teils >30 cm Schnee (Karte: @slfdavos.bsky.social). Zwischendurch geben die Wolken den Blick auf den Sägistalsee frei (Bild via faulhorn.roundshot.com ): Die Landschaft ist wunderschön weiss und der See beginnt vom Rand her langsam zuzufrieren...

Norbert Marwan @pucicu.de · Oct 24

Next result from our fruitful collaboration with UFPR in Curitiba: Effect of sampling size in recurrence microstates analysis
authors.elsevier.com/c/1l~sR1M2-2...

authors.elsevier.com

Norbert Marwan @pucicu.de · Oct 21

digitalcourage.de/blog/2025/ne...

Nein, wir sind nicht auf Instagram, TikTok & Co

Faschismus wird lauter, Demokratie kränkelt. Giergetriebene soziale Medien befeuern diese Trends. Wir sind ausgestiegen – und bauen im Fediverse

digitalcourage.de

Norbert Marwan @pucicu.de · Oct 21

This month's CTCS webinar:
Prof. Dibakar Ghosh (Indian Statistical Institute, Kolkata)

Coexisting dynamics of swarming and synchrony in complex systems

Date: Oct 27, 2025
Tim: 8:30 PM IST/ 4:00PM CET
Zoom link: us06web.zoom.us/webinar/regi...
Webinar ID: 872 4023 8715

Reposted by Norbert Marwan, Philipp Sarasin

Ralph Ruthe @ruthe.de · Oct 20

Wenn Friedrich Merz sich auch nur ansatzweise interessieren würde dafür, was gut für meine Töchter ist, nähme er die Klimakrise ernst, würde den Verbrennungsmotor in Rente schicken, Überreiche fair besteuern und nie mehr AfD-Parolen nachbellen.

Norbert Marwan @pucicu.de · Oct 8

😃 Our PIKART catalog paper (dx.doi.org/10.1029/2024...) has made it into youtube: youtu.be/fhWLv4xo4fE?...

What we know about Atmospheric Rivers: the latest peer-reviewed science…

YouTube video by Paul Beckwith

Reposted by Norbert Marwan, Daniel Stein

Der Volksverpetzer @volksverpetzer.de · Sep 25

Im französischen Fernsehen haben sie den CSU-Chef Markus Söder analysiert - als "Gastro-Populisten". Und manchmal hilft der Blick von außen, um eine PR-Strategie besser zu verstehen. Sehenswert!

Quelle:
www.arte.tv/de/videos/12...

Norbert Marwan @pucicu.de · Sep 24

Movie about the expedition in Angola with Speleoclub Berlin participation: "Decoding Climate from the Caves of Angola" youtu.be/SxA75t1AlKs?...

Decoding Climate from the Caves of Angola

YouTube video by American Museum of Natural History

Norbert Marwan @pucicu.de · Sep 24

After digitising our recent mappings and surveys, we can now report that we have finally surpassed the 10 km milestone of mapped caves in the Sägistal! 😃

Norbert Marwan @pucicu.de · Aug 25

Very successful cave week with a lot of newly discovered an mapped cave meters!

Norbert Marwan @pucicu.de · Sep 24

The deadline for the EPJ ST Special Issue: Unraveling Spatio-Temporal Dynamics in Stochastic and Complex Systems is approaching! (Oct 31, 2025)
epjst.epj.org/epjst-open-c...

EPJ Special Topics (EPJ ST)

The European Physical Journal Special Topics (EPJ-Special Topics) is devoted to the rapid and timely publication of topical issues in all fields pertaining to the pure and applied physical sciences

Norbert Marwan @pucicu.de · Sep 24

Did you know that at least half a million people are living on landslides and have expanded their total built-up area by 12% over the last 30 years? Read more in our study on large landslides in @agu.org Geophys Res Lett doi.org/10.1029/2025...

Exposure to Large Landslides in Cities Outpaces Urban Growth

We identify 1,085 large (>0.1 km2) urban landslides inhabited by half a million people in total Built-up areas on large landslides have doubled from 1985 to 2015 Population trends of adjacent mo...

Norbert Marwan @pucicu.de · Sep 24

Cool! It even mentions our study "Visual Analytics for Correlation-Based Comparison of Time Series Ensembles"
doi.org/10.1111/cgf....

Reposted by Norbert Marwan

Recurrence Plots @recurrence-plot.tk · Sep 23

Accelerated bioclimatic warming in Poland (1951–2023) was analyzed using #recurrence_plot analysis. A phase transition in thermal stress patterns was detected around 1980–1990, revealing increased heat stress and decreased cold stress, with 1990 marking a remarkable shift. doi.org/10.1109/TGRS...

A Scalable and Automated Recurrence Plot Method for Detecting Climate Change: The Case of the UTCI Bioclimatic Index in Central Europe

Recent decades have brought increasing effects of climate change and variation. Climate changes, indicated by various bioclimatic indices, influence the functioning of living organisms, including huma...

Norbert Marwan @pucicu.de · Sep 22

This month's CTCS webinar will be delivered by Dr. Frank Hellmann from our institute @pik-potsdam.bsky.social
Title: Dynamics of modern power grids - A complex systems perspective
Time: September 29, 2025, 16:00 CEST.
us06web.zoom.us/webinar/regi...

Reposted by Norbert Marwan

Recurrence Plots @recurrence-plot.tk · Sep 22

Challenges and perspectives in recurrence analyses of event time series dx.doi.org/10.3389/fams...

Frontiers | Challenges and perspectives in recurrence analyses of event time series

The analysis of event time series is in general challenging. Most time series analysis tools are limitedfor the analysis of this kind of data. Recurrence ana...