All EGU27 oral sessions will be available for participants in a hybrid format (virtual and on-site). The hybrid function of the oral presentations will be delivered with Zoom meetings using lectern cameras and microphones. Oral sessions will be scheduled for a specific day and time block(s) in a lecture room in Vienna (simultaneously on Zoom), following the schedule.

• The duration of a regular (non-solicited) oral presentation is 10 minutes (including questions), and authors are requested to keep time. Conveners can allocate a maximum of 10 presentations in one time block, with the option to use the remaining 5 minutes to introduce the session at its beginning.
• Authors of oral presentations are strongly recommended to upload supplementary materials for asynchronous discussion and possible revision during a 2-month period, from 10 March to 30 April 2027. During this commenting and discussion period, only registered attendees are granted access. Afterwards, supplementary materials are opened to the public through EGUsphere and distributed following the CC-BY License.
• A minimum of 24 hours prior to the oral session's start time, authors have to upload their presentation file containing the slides. During upload of the live presentation file, the author can select whether the presentation is linked to and visible to registered conference participants on the session page alongside the abstract during the session’s scheduled time block(s) or not at all.

Scheduled oral sessions will proceed as follows:

• On-site authors use the lectern and its microphone to give their presentation. They forward their own slides from the presentation previously uploaded. The presentation runs on the lecture room computer connected to a projector and shared simultaneously in the Zoom meeting.
• Virtual authors will join the session through the Zoom meeting link. Once their presentation begins they will unmute themselves in order to speak to the on-site and virtual attendees. Their previously uploaded presentation will be shared by the on-site conference assistant on the lecture room computer. The conference assistant will move the slides forward for the virtual speaker. The virtual speaker's camera feed is shown to the on-site attendees on the projector.
• On-site attendees engage with all presentations on the screen inside the lecture room. They can pose questions to the speaker (either virtual or on-site) moderated by a chairperson, using the in-room microphone.
• Virtual attendees engage with all presentations using the Zoom meeting operated from the lecture room computer. Virtual attendees will have a side-by-side view of either the on-site or virtual presenter and the presentation slides. They can ask questions through the Zoom chat. The session chairperson can repeat the questions, to be answered by on-site or virtual authors.

All EGU27 poster sessions will be available for participants in a hybrid format (virtual and on-site). They will be scheduled on a specific day and time block(s), following the schedule below:

EGU27 poster schedule

• The posters are either presented on-site in Vienna or remotely, using the Zoom meetings platform.
• Authors of on-site posters are assigned a poster board number in a poster hall in Vienna, where they can fix their poster during their assigned on-site display and attendance times on the day of their session.
• Authors of virtual posters are also assigned a poster board number in a poster hall in Vienna, where a conference assistant will print and fix the poster during the assigned on-site display and attendance times on the day of the author's session.
• In order to support access by both on-site and online attendees to both on-site and virtual posters, authors of poster presentations are strongly recommended to upload supplementary materials for asynchronous discussion and possible revision during a 2-month period from 10 March to 30 April 2027. During this commenting and discussion period, only registered attendees are granted access. Afterwards, supplementary materials are opened to the public through EGUsphere and distributed following the CC-BY License. The supplementary material of a poster presentation does not have to be the poster layout itself, it can also be a PowerPoint presentation or a recorded video.
• A minimum of 24 hours prior to the (on-site or virtual) poster session's start time, authors must upload a presentation file containing their poster. When uploading the file, the author can select whether their live presentation poster file is visible only during their session or for the full conference week. The corresponding supplementary materials are available for a 2-month period for commenting and discussion.

The scheduled poster sessions will proceed as follows:

• On-site authors hang up their poster in the poster hall in Vienna on their assigned poster board number at the beginning of their respective display time (time block 1 or 3). During their scheduled attendance time, on-site presenters stand next to their poster, presenting and exchanging with on-site attendees. Presenters are welcome to continue the discussion beyond their scheduled attendance time, but should be mindful to take down their poster, by 13:30 for AM sessions or 19:00 for PM sessions, when clean-up commences. Any posters left hanging during the clean-up period will be discarded by the conference assistants. Following the scheduled on-site poster presentations, authors should check their supplementary materials for any further discussions and questions that might come from virtual attendees, as they can post comments to the supplementary materials.
• Virtual authors are required to join their assigned Zoom meeting during their scheduled attendance time and unmute their microphone to speak. They can field questions and discuss their posters with both virtual and on-site participants. The virtual posters will be printed and displayed at physical poster boards in Vienna by conference assistants. Each virtual poster will be accompanied by a tablet and headphones, as well as a QR code that links directly to the Zoom meeting for real-time interaction between virtual and on-site participants. Virtual poster authors are therefore required to upload their poster as a live presentation file no latter than 24 hours in advance of their poster session, enabling participants to view their poster in detail through the session’s web page and on-site at their assigned physical poster board. (Please note that if a presentation file for a virtual poster is not uploaded at least 24 hours prior to the start of the session, the poster will not be printed and hung up in the poster hall.) Since the Zoom links are created for each individual virtual poster, it is possible to remain in the Zoom meeting beyond the scheduled attendance time to continue the discussion online. It is also recommended to upload supplementary materials, where comments can be added and answered during a 2-month period.
• On-site attendees visit on-site posters in the on-site poster halls in Vienna. Virtual poster interaction can take place in one of two ways: by accessing Zoom session remotely, through the link provided in the programme or in the on-site poster halls in Vienna, where each virtual poster is printed and hanging. On-site attendees can listen to virtual poster presenters and interact with them by posing questions using the headsets provided at the poster board or by scanning the QR code with their own device, which takes them directly to the Zoom meeting.
• Virtual attendees access virtual poster presentations through Zoom, using the link provided in the programme. The virtual poster presentations will take place during time blocks 1, 2, 3, and 4, with each author receiving a designated attendance time, as outlined by the session programme.

All EGU27 PICO sessions will be available for participants in a hybrid format (virtual and on-site). They will be scheduled on a specific day during time blocks 1, 2, 3, and 4 at a PICO spot in Vienna, following the schedule below:

EGU27 PICO schedule

• The PICO spots provide a combination of a stage and audience area for a 2-minute summary of abstract introductions, together with a number of individual PICO screens for a longer and more detailed presentation of slides or other materials and discussions. PICO spots will also be provided with a Zoom meeting connection to allow virtual PICO presentation and attendance during the 2-minute introductory talks and to host discussions with virtual PICO authors.
• The abstracts of a PICO session are scheduled for a specific time and day. On-site PICO authors are assigned a PICO screen number on-site in Vienna. Virtual PICO authors are connected all together to the big screen in the stage.
• Authors of PICO presentations are strongly recommended to upload supplementary materials for asynchronous discussion and possible revision during a 2-month period from 10 March to 30 April 2027. During this period of commenting and discussion, only registered attendees are granted access. Afterwards, supplementary materials are opened to the public through EGUsphere and distributed following the CC-BY License. The supplementary material of a PICO presentation can be the same as the presentation file, but does not have to be. Authors can choose if they wish to provide further information or even a recorded video.
• A minimum of 24 hours prior to the PICO session's starting time, authors have to upload their actual live PICO presentation file containing the slides for the 2-minute introductory abstract summary presentation, as well as the longer, detailed presentation. This full file is linked alongside the abstract on the session's web page. During upload, the author can select whether their live presentation file is visible to registered conference participants only during the session's scheduled time block(s) or for the full conference week. The corresponding supplementary materials are available for a 2-month period for commenting and discussion.

Scheduled PICO sessions will proceed as follows:

• On-site authors use the lectern at the stage at the PICO spot to present their previously uploaded live PICO 2-minute presentation file. On-site presenters will be able to move their own slides forward. The projection at the PICO spot's screen will be shared simultaneously in the Zoom meeting for virtual attendees. After all PICO presentations have been pitched, the on-site authors move to their assigned individual PICO viewing screen (according to their assigned number) at the PICO spot. The presentation file is automatically opened at the PICO viewing screen. On-site attendees will then be able to meet the authors, ask questions, and discuss their longer format presentation slides. Following the scheduled on-site live PICO presentations, authors should check their supplementary materials for questions that may come from virtual attendees, which can only be posted as comments to the supplementary materials and discussed there.
• Virtual authors will use the provided Zoom meeting to give their 2-minute introductory presentation. The previously uploaded presentation files will be controlled by the conference assistant on-site at the PICO spot in Vienna. The presenters will unmute themselves to be heard within Zoom by virtual attendees, as well as by the on-site attendees in Vienna. After all PICO presentations have been pitched, the virtual authors will remain on Zoom for a moderated discussion, accepting questions from the on-site and virtual audience members. Further discussion can take place in the comments of the uploaded supplementary materials, which can be answered at a later time.
• On-site attendees will visit the PICO spot's stage area first, to follow the 2-minute introductory talks. Afterwards, they move on to the PICO viewing screens according to their interest. They can engage with the presentation files as these files automatically open on the assigned screens and ask questions to the on-site author directly. Alternatively, attendees may stay in the PICO stage area to interact and ask questions to the virtual PICO authors using a microphone that will be available, and following instructions of the on-site chairperson and the conference assistant. Further discussion or questions can take place on the uploaded supplementary materials, which can be answered at a later time.
• Virtual attendees engage with all 2-minute introductory presentations using the Zoom meeting operated from the PICO spot computer. Virtual attendees will have a side-by-side view of either on-site or virtual presenters and the presentation slides. Following the 2-minute presentations, virtual attendees stay in the Zoom meeting. They can then interact with both on-site and virtual attendees and other virtual PICO authors. A chairperson will moderate the discussions. Virtual attendees can ask questions to virtual presenters through the Zoom meeting connection, but they can only ask questions to on-site authors by posting a comment on their supplementary materials for discussion.