BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//geodesy.science - IAG website - ECPv6.17.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:geodesy.science - IAG website
X-ORIGINAL-URL:https://geodesy.science
X-WR-CALDESC:Events for geodesy.science - IAG website
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:UTC
BEGIN:STANDARD
TZOFFSETFROM:+0000
TZOFFSETTO:+0000
TZNAME:UTC
DTSTART:20240101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VTIMEZONE
TZID:Australia/Sydney
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20250405T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20251004T160000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20260404T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20261003T160000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20270403T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20271002T160000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=UTC:20260708T150000
DTEND;TZID=UTC:20260708T160000
DTSTAMP:20260513T080930Z
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:20260616
DTEND;VALUE=DATE:20260620
DTSTAMP:20260312T075546Z
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:20260611T150000
DTEND;TZID=UTC:20260611T160000
DTSTAMP:20260424T132633Z
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;TZID=UTC:20260512T170000
DTEND;TZID=UTC:20260512T180000
DTSTAMP:20260323T123504Z
CREATED:20260323T123504Z
LAST-MODIFIED:20260323T123504Z
UID:34662-1778605200-1778608800@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Allie Coonin (Brown University\, Providence\, USA) and Tamara Pico (University of California\, Santa Cruz\, USA) will present: \n“Transient Earth Rheology Temporarily Slows West Antarctic Ice Retreat in Future Climate Projections” \nProjections of sea-level change and Antarctic Ice Sheet (AIS) stability under anthropogenic climate change hinge upon accurately describing physical feedbacks that link ice dynamics (marine and terrestrial) with the gravitational\, rotational and deformational response of the solid Earth to ice and ocean loading changes. The marine-based West Antarctic Ice Sheet (WAIS) is vulnerable to runaway grounding line retreat. However\, the rapid viscoelastic rebound of the bedrock in response to ice retreat has been shown to stabilize its grounding line\, aided by the low-viscosity mantle beneath the WAIS. Such bedrock deformation is typically modelled with idealized Maxwell viscoelasticity\, despite that rock deformation experiments show that additional transient creep mechanisms occur over societally relevant (~decadal-centennial) timescales that are missing from the Maxwell model. We simulate future AIS evolution\, coupled with self-consistent solid Earth deformation and sea level change\, for various emissions scenarios (RCP 2.6\, 4.5\, 8.5)\, incorporating transient deformation. This more complete treatment of solid Earth deformation delays grounding line retreat as compared to Maxwell projections\, with differences of tens of kilometres persisting for decades at Pine Island and Thwaites Glaciers. While transient deformation is unable to prevent the bulk of sea-level rise over the next 500 years\, such considerations are crucial to predict the full Earth system response\, since AIS meltwater flux to the ocean affects the pace of global temperature rise.
URL:https://geodesy.science/event/talks-on-gia-seminar-5/
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;TZID=Australia/Sydney:20260305T070000
DTEND;TZID=Australia/Sydney:20260305T080000
DTSTAMP:20260218T140956Z
CREATED:20260218T140956Z
LAST-MODIFIED:20260218T140956Z
UID:33158-1772694000-1772697600@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Paul Tregoning (Australian National University\, Canberra\, Australia)\, will present \n“A tool to assess the accuracy of glacial isostatic adjustment predictions of present-day crustal uplift rates” \nWhile there are many global and regional glacial isostatic adjustment (GIA) models available that can be used to compute expected present-day uplift rates of the surface of the Earth\, they do not always agree in their predictions. Obtaining accurate estimates of uncertainties in predictions is difficult due to the assumptions that must be made when constructing the GIA models\, and geodetic users often simply adopt a preferred model or assign uncertanties based on the spread of values derived from several models. Here we show that\, through a combination of gravity changes observed by GRACE/GRACE-FO and uplift observed by GNSS\, it is possible to quantify the error in uplift rates of one or more GIA models. Whilst it is not possible to repair the GIA models directly\, this tool can be used to identify regions where ice histories and/or Earth rheology parameters are deficient in the GIA models. In this talk I will give examples of locations where GIA modelling appears to be very accurate as well as indicate some locations that are clearly problematic.
URL:https://geodesy.science/event/talks-on-gia-seminar-4/
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:20250602
DTEND;VALUE=DATE:20250607
DTSTAMP:20250325T113645Z
CREATED:20250305T062105Z
LAST-MODIFIED:20250325T113645Z
UID:25594-1748822400-1749254399@geodesy.science
SUMMARY:2025 Glacial Isostatic Adjustment workshop: Advancing Models and Observational Constraints
DESCRIPTION:We are excited to announce that registration for the “2025 Glacial Isostatic Adjustment workshop: Advancing Models and Observational Constraints” taking place on June 2nd to 6th\, 2025\, in Sidney (British Columbia\, Canada) & online\, is now open. \nTo register\, please visit our website at https://polenet.org/2025-gia-workshop-registration/. \nPlease note that space is limited by the physical capacity of the workshop venue. Depending on the level of interest\, it may be necessary to cap in-person registration. If needed\, priority will be given to individuals with accepted abstracts and invited speakers\, with the remaining in-person registration seats offered on a first come\, first served basis. A notification will be posted on the workshop website (https://polenet.org/2025-gia-workshop/) if all in-person spaces have been filled. Registration deadline is April 11th\, 2025\, for in-person attendees. Virtual attendance is free of charge and there is no limit on the number of attendees. \nThe schedule and detailed programme will be published on the workshop website soon. \nIf you have any questions\, please feel free to reach out to Karen Simon (karen.simon@nrcan-rncan.gc.ca).
URL:https://geodesy.science/event/2025-glacial-isostatic-adjustment-workshop-advancing-models-and-observational-constraints/
LOCATION:Sidney\, CA\, Sidney\, Canada
CATEGORIES:Commission 3,IACS,IASPEI
END:VEVENT
END:VCALENDAR