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X-WR-CALDESC:Events for geodesy.science - IAG website
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BEGIN:VEVENT
DTSTART;TZID=UTC:20260611T150000
DTEND;TZID=UTC:20260611T160000
DTSTAMP:20260608T083717
CREATED:20260424T132633Z
LAST-MODIFIED:20260424T132633Z
UID:35665-1781190000-1781193600@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Achraf Koulali (Newcastle University\, UK) and Matt King (University of Tasmania\, Australia) will present: \n“Sensitivity of Antarctic GPS time series to varying surface mass balance loads\, and implications for estimates of Glacial Isostatic Adjustment” \nAntarctic Global Positioning System (GPS) vertical time series exhibit non-linear signals across a wide range of temporal scales\, complicating the interpretation of long-term deformation associated with Glacial Isostatic Adjustment (GIA). One important contributor to these non-linearities is the short-term elastic response of the solid Earth to contemporaneous surface mass balance (SMB) variability. During the first part of this talk\, we will show analysis results of GPS vertical displacement time series from the Transantarctic Mountains (TAM) to quantify the impact of SMB-driven loading on observed crustal motion. SMBL-induced deformation is found to introduce multiyear apparent changes in vertical velocities. After correcting for SMB loading\, most GPS sites exhibit near-zero uplift rates\, with a median velocity of 0.67 mm/yr\, substantially lower than predicted by forward GIA models. We will then discuss these results within the wider context of Antarctica to show the critical role of SMB loading variability in interpreting GPS observations more widely\, with implications for estimates of present-day Antarctic ice mass change. As a second case study\, we will discuss the sensitivity of GPS velocities to SMB variability in a critical sector of East Antarctica\, including in the Denman-Totten glacier region\, suggesting that bedrock motion in that region is broadly of subsidence rather than uplift in contrast to GIA models. Finally\, we will show that modelled SMB variability can be compared with GPS elastic displacements across Antarctica\, as a new form of SMB model validation.
URL:https://geodesy.science/event/talks-on-gia-seminar-6/
CATEGORIES:Commission 3,IACS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Joint IAG-IACS Commission on Cryospheric Deformation (Sub-Commission 3.4)":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260616
DTEND;VALUE=DATE:20260620
DTSTAMP:20260608T083717
CREATED:20260312T075546Z
LAST-MODIFIED:20260312T075546Z
UID:34152-1781568000-1781913599@geodesy.science
SUMMARY:12 Spanish-Portuguese Assembly of Geodesy & Geophysics
DESCRIPTION:The Spanish-Portuguese Assembly of Geodesy and Geophysics\, which held its first meeting in Almería in 1998\, began meeting every two years\, alternating between the two countries responsible\, Spain and Portugal. Over the course of its sessions\, it has established itself as a research forum in the fields of Geodesy\, Seismology\, Meteorology\, Geomagnetism\, Hydrology\, Oceanography\, Volcanology\, Applied Geophysics\, and Cryospheric Sciences\, as well as a place for meeting and scientific exchange between Spanish and Portuguese researchers through the presentation and discussion of papers in these fields. The COVID-19 period marked the largest gap in the established periodicity\, which we now wish to resume. Thus\, two years after the last meeting\, which took place in Évora in 2024\, the 2026 meeting will be held in Spain. Next June\, from the 16th to the 19th\, Universidad Politécnica de Madrid and its Higher Technical School of Topography\, Geodesy\, and Cartography will host the 12th Spanish-Portuguese Assembly of Geodesy and Geophysics.
URL:https://geodesy.science/event/12-spanish-portuguese-assembly-of-geodesy-geophysics/
LOCATION:ETSI Topografía\, Geodesia y Cartografía\, Mercator Avenue\, Madrid\, 28031\, Spain
CATEGORIES:GGOS,IACS,IAGA,IAHS,IAMAS,IAPSO,IASPEI,IAVCEI,📚 Education & Training
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/ahpgg_2026.jpg
ORGANIZER;CN="CEGG - Comision Espa%C3%B1ola de Geodesia y Geofisica and Politechnical University of Madrid":MAILTO:ahpgg2026@topografia.upm.es
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260708T150000
DTEND;TZID=UTC:20260708T160000
DTSTAMP:20260608T083717
CREATED:20260513T080930Z
LAST-MODIFIED:20260513T080930Z
UID:36272-1783522800-1783526400@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Tao Yuan (University of Colorado\, USA) working with\nShijie Zhong\, Glenn Milne\, Donna dePolo \nwill present \nReconciling inferences of mantle viscosity and late Quaternary ice history – the importance of an asthenosphere and 3-D viscosity \nDeglaciation history models from the last glacial maximum (LGM) and accompanying mantle viscosity structures have been jointly constrained by fitting the paleo-sea level data through glacial isostatic adjustment (GIA) modeling. However\, some GIA-inferred 1-dimensional (1-D) viscosity models\, including the widely used VM5a\, contradict the mantle viscosity structure inferred using other approaches\, such as seismic imaging\, mineral physics and geodynamics. Here we show that GIA models with realistic 3-D mantle viscosity derived from seismic structures with an effective activation energy of 300-400 kJ/mol and a weak asthenosphere fit paleo-sea level data in North America better than several widely used 1-D GIA models. Our results also demonstrate that the inclusion of the asthenosphere and lateral viscosity variations permits a larger range of North American ice sheet reconstructions that produce quality fits to the sea-level data\, including models with substantially greater volume at LGM\, thus identifying a potential solution to balancing the sea level budget during this key climate event. To fit far-field sea level data\, the ice volume at LGM in North America is required to be 10%-20% larger than that in ICE-6G\, if ice models outside North America are unchanged.
URL:https://geodesy.science/event/talks-on-gia-seminar-7/
CATEGORIES:Commission 3,IACS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Joint IAG-IACS Commission on Cryospheric Deformation (Sub-Commission 3.4)":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20270716
DTEND;VALUE=DATE:20270723
DTSTAMP:20260608T083717
CREATED:20250305T083912Z
LAST-MODIFIED:20250730T082830Z
UID:25751-1815696000-1816300799@geodesy.science
SUMMARY:IUGG General Assembly 2027
DESCRIPTION:This IUGG General Assembly will get under way at Incheon’s Songdo Convensia in July 2027. Incheon is expecting more than 5\,000 scientists and experts from both Korea and abroad to attend the event. \nEvent Category: iugg
URL:https://geodesy.science/event/iugg-general-assembly-2027/
LOCATION:Incheon\, South Korea\, Incheon\, South Korea
CATEGORIES:IACS,IAG,IAGA,IAHS,IAMAS,IAPSO,IASPEI,IAVCEI,IUGG
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/iugg2027_incheon-korea.png
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20280528
DTEND;VALUE=DATE:20280603
DTSTAMP:20260608T083717
CREATED:20251210T083426Z
LAST-MODIFIED:20251210T083426Z
UID:32258-1843084800-1843603199@geodesy.science
SUMMARY:2028 Glacial Isostatic Adjustment Workshop
DESCRIPTION:A workshop focused on glacial isostatic adjustment (GIA)\, ice sheets\, sea-level change\, and associated geodetic and geophysical observational constraints will be held in Dresden\, Germany\, from 28 May to 2 June 2028. This will be a follow-on workshop in a series of similar events. The last GIA Workshop took place in Sidney\, BC\, Canada\, in 2025 (cf. https://polenet.org/2025-gia-workshop/). Detailed information will be published in due time.
URL:https://geodesy.science/event/2028-glacial-isostatic-adjustment-workshop/
LOCATION:TU Dresden\, Dresden\, Germany
CATEGORIES:Commission 3,IACS,IAG,IASPEI,IUGG
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="IAG/IACS subcommission 3.4 %E2%80%9CCryospheric Deformation%E2%80%9D":MAILTO:mirko.scheinert@tu-dresden.de
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