Webinar: Deciphering  the ocean magnetic stripes: the signal and the recorder 

InterRidge 2022 Webinar June
 
Dr. Jérôme Dyment  (Senior Researcher, Université Paris Cité, Institut de physique du globe de Paris, CNRS)
08:00 GMT (10:00 CEST), Tuesday, June 28, 2022
Meeting ID: 915 0817 5439
Passcode: 251400
  
Summary
Marine magnetics have been essential in leading the geoscience community to adopt Plate Tectonics as the new paradigm of Earth Sciences  in the 1960s. Despite their wide use to date, understand the structure and reconstruct the past evolution of ocean basins, marine magnetic anomalies still have the potential to tell us more about the recorded signal - the main geomagnetic field history of the last 160 Ma - and the recorder - the oceanic crust and possibly the uppermost mantle. We will revisit both aspects in the light of recent works in various tectonic contexts - mid-ocean ridges, oceanic basins, subduction zones and passive margins - to derive a consistent picture of the magnetic structure of the oceanic lithosphere at different steps of its evolution. We will show that mastering both aspects - the recorder and the signal - are essential to properly date the seafloor, with examples from Meso-America, and will insist on the importance of collecting new well-navigated magnetic profiles to supersede those acquired before satellite positioning and increase the resolution of plate reconstructions.
  
Main points
1. Marine magnetic anomalies are still not used at their full potential - they contain a lot more info than dating  the oceanic lithosphere.
2. A first info is on the recorded signal, the main geomagnetic field history of the last 160 Ma, both in polarity and in intensity.
3. A second info is on the recorder, the magnetic structure of the oceanic crust in different contexts, from its creation at mid-ocean ridges to its destruction in subduction zones. 
4. Underway magnetic data should still be collected, if only to replace pre-GPS data for accurate plate reconstructions.
 
Biography
 
Dr. Jérôme Dyment is CNRS Senior scientist at Institut de Physique du Globe de Paris, France. His research interest focuseson marine magnetic anomalies, to 1) date and reconstruct  the structure and evolution of ocean basins, 2) depict the structure and magnetic properties of the oceanic lithosphere and understand active processes at mid-ocean ridges, and 3) refine the history of the geomagnetic field to constrainits mechanisms. Holding an Engineer Degree and a PhD in Geophysics (Strasbourg, resp. 1987 and 1991), he is the author of more than 90 scientific publications, supervised 10 PhD theses, participated 20 scientific  cruises (9 as chief scientist), and is or was PI of French and bilateral scientific projects with, for the most recent ones, India, Mauritius, Japan, Korea, and Indonesia. Among various community tasks, he has been the advisor of CNRS Director for marine geosciences (2006-2011), the president of the French committee associated to the International Union of Geodesy and Geophysics (2010-2014), the head of the Marine Geoscience Team of Institut de Physique du Globe de Paris (2013-2016), and Steering Committee member (2001-2010) and the chair (2016-2020) of InterRidge.  He is also leading the Task Force appointed by the International Association of Geomagnetism and Aeronomy to build the World Digital Magnetic Anomaly Map.    
 

The Institute of Oceanology of the Polish Academy of Sciences invites you to a lecture: "Ecological dynamics of mangrove coastal areas in Mekong Delta"

The Institute of Oceanology of the Polish Academy of Sciences invites you on Monday, June 13 at 11:00 am to his Big Hall for a lecture by Dr. Vo Luong Hong Phuoc, head of the Earth Sciences Department at the University of Science in Ho Chi Minh (Saigon, Vietnam).

The subject of the paper, "Ecological dynamics of mangrove coastal areas in Mekong Delta", is a continuation of the research carried out as part of the doctoral dissertation under the supervision of prof. Stanisław Massel.

The seminar will also be available on the Internet, however we cordially invite you to participate in person.

Subject: Lecture by Dr. Vo Luong Hong Phuoc Time: Jun 13, 2022 11:00 Warsaw

Join a Zoom meeting https://us06web.zoom.us/j/86224417714?pwd=bnExdFM5QUEzbWJKMXQxSEJLZ2M4Zz09

Meeting ID: 862 2441 7714

Access code: 366311

Conference: Climate Change: Science & Society

Conference leaflet

The 5th edition of the Polish Scientific Networks (https://psn.cs.put.poznan.pl/psn/) conference entitled Climate Change: Science & Society (September 28-30, 2022 in Wroclaw, Poland) is devoted to the causes and impacts of climatic changes. It will bring together leading Polish climate change researchers and experts from around the world to better understand climate impacts on world environments and societies – and how to respond to them.

We would like to bring your attention to climate change and ocean related session. Please send your abstracts by 30 June 2022.

Werbinar: "Remote-sensing estimation of water quality in estuarine and coastal waters: A case study"

According to program for the Szczecin Marginal Seas Webinars during the Summer Semester 2021/2022  (attached) we invite you warmly for the Webinar to be held
on May 19, 2022, 2:00 pm (CET).

Please, join our online meeting for the lecture:
"Remote-sensing estimation of water quality in estuarine and coastal waters: A case study"

to be presented by Prof. Dr. Yuanzhi Zhang, Institute of Asia-Pacific Studies, Chinese University of Hongkong, China.

Abstract

In this study, we applied the in-situ and remote-sensing data to the Pearl River estuarine and coastal waters in the north of South China Sea. Specific focus is placed on (a) comparing the ability of the models to estimate chl-a in the range 1–12 mg m−3, which is typical for coastal and estuarine waters, and (b) assessing the potential of the Moderate Resolution Imaging Spectrometer (MODIS) and Medium Resolution Imaging Spectrometer (MERIS) to estimate chl-a concentrations. Reflectance spectra and water samples were collected at 13 stations with chl-a ranging from 0.83 to 11.8 mg m−3 and total suspended matter from 9.9 to 21.5 g m−3. A close relationship was found between chl-a concentration and total suspended matter concentration with the determining coefficient (R2) above 0.89. The MBR calculated in the spectral bands of MODIS proved to be a good proxy for chl-a concentration (R2 > 0.93). On the other hand, both the NIR–red three-band model, with wavebands around 665, 700, and 730 nm, and the NIR–red two-band model (with bands around 665 and 700 nm) explained more than 95% of the chl-a variation, and we were able to estimate chl-a concentrations with a root mean square error below 1 mg m−3. The two- and three-band NIR–red models with MERIS spectral bands accounted for 93% of the chl-a variation. We also applied Landsat-8 OLI data to estimate suspended matter in the same area. These findings imply that the extensive database of MODIS, MERIS, and Landsat images could be used to quantitatively monitor chl-a and suspended matter in estuarine and coastal waters.

The meeting room will be open from 1:30 pm (CET), but the seminar will begin at 2:00 pm (CET).
To join the meeting please use the link

https://teams.microsoft.com/l/meetup-join/19%3a0ee21c3b364e4709810bc45b7fbb4284%40thread.tacv2/1652701441398?context=%7b%22Tid%22%3a%22af892dd6-4563-4455-9c05-a398a43f2362%22%2c%22Oid%22%3a%221e9df312-5fc1-4e40-bc0d-ab7f66ee7bd8%22%7d

or use the code: 2sc5rph

Webinar: Long-term plate tectonic evolution of the Caribbean Sea and Gulf of Mexico as marginal seas of the Central Atlantic Ocean

Szczecin Marginal Seas Webinars' Conveners invite you to join the Webinar to be held on April 28, 2022, 2:00 pm (CET).

Join online meeting for the lecture: "Long-term plate tectonic evolution of the Caribbean Sea and Gulf of Mexico as marginal seas of the Central Atlantic Ocean" to be presented by Prof. Dr. Martin Meschede, Institute of Geography and Geology, University of Greifswald, Germany.

Abstract

The Gulf of Mexico and the Caribbean Sea are two marginals seas of the Atlantic Ocean that developed in direct relation to the opening of the Central Atlantic Ocean as a consequence of the breakup of Pangea during the Mesozoic. The opening of the Gulf of Mexico started in the Early Jurassic and ceased in Early Cretaceous times when the spreading axis shifted towards SE resulting in the opening of the Proto-Caribbean Sea. Sedimentary deposits comparable to the Central European Basin of the Permian developed in particular in the Gulf of Mexico forming the hydrocarbon resources in this region. With the opening of the Southern Atlantic the spreading axis shifted again. The Caribbean Sea became an independent plate as a result of lateral movements and the evolution of subduction zones since the middle Cretaceous.

The meeting room will be open from 1:30 pm (CET), but the seminar will begin at 2:00 pm (CET).
To join the meeting please use the link:

https://teams.microsoft.com/l/meetup-join/19%3a0ee21c3b364e4709810bc45b7fbb4284%40thread.tacv2/1650879761533?context=%7b%22Tid%22%3a%22af892dd6-4563-4455-9c05-a398a43f2362%22%2c%22Oid%22%3a%221e9df312-5fc1-4e40-bc0d-ab7f66ee7bd8%22%7d

or use the code: 2sc5rph

  1. Extended deadline for reception of 2022 new SCOR Working Groups proposals: 14 May 2022
  2. The 2022 Call for POGO-SCOR Fellowships is open!
  3. Polish Scientific Institutions for Information Society under Decade of Ocean Science for Sustainable Development
  4. Applications for the ECOTIP Summer School
  5. 2022 Copernicus Marine training workshop
  6. SeaExplorer virtual workshop

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