Blaž Gasparini
@blazgaspa.bsky.social
Clouds and climate; Oblakolog;
Cloudy, not blue sky!
Senior scientist @univie.ac.at; previously @UW Atmos Sci, PhD @usyseth.bsky.social
https://blazgasparini.wixsite.com/blaz-gasparini-site
https://klimadynamik.univie.ac.at
Cloudy, not blue sky!
Senior scientist @univie.ac.at; previously @UW Atmos Sci, PhD @usyseth.bsky.social
https://blazgasparini.wixsite.com/blaz-gasparini-site
https://klimadynamik.univie.ac.at
Always nice to have a window seat:
Freezing of a cloud: Wegener-Bergeron-Findeisen process in action in this punch hole cloud example
Something the CloudLab team is recreating artificially cloudlab.ethz.ch
Freezing of a cloud: Wegener-Bergeron-Findeisen process in action in this punch hole cloud example
Something the CloudLab team is recreating artificially cloudlab.ethz.ch
November 7, 2025 at 2:29 PM
Always nice to have a window seat:
Freezing of a cloud: Wegener-Bergeron-Findeisen process in action in this punch hole cloud example
Something the CloudLab team is recreating artificially cloudlab.ethz.ch
Freezing of a cloud: Wegener-Bergeron-Findeisen process in action in this punch hole cloud example
Something the CloudLab team is recreating artificially cloudlab.ethz.ch
Very bright circumzenithal arc from last weekend!
October 23, 2025 at 9:10 PM
Very bright circumzenithal arc from last weekend!
I spent a great week visiting the CELLO-Arctic campaign, led by Tim Carlsen and Rob David from the University of Oslo, one of efforts to validate EarthCARE’s products.
I learned a lot about flight planning & really enjoyed the positive vibes and excitement!
More on their website: lnkd.in/dWvANupz
I learned a lot about flight planning & really enjoyed the positive vibes and excitement!
More on their website: lnkd.in/dWvANupz
October 15, 2025 at 4:25 PM
I spent a great week visiting the CELLO-Arctic campaign, led by Tim Carlsen and Rob David from the University of Oslo, one of efforts to validate EarthCARE’s products.
I learned a lot about flight planning & really enjoyed the positive vibes and excitement!
More on their website: lnkd.in/dWvANupz
I learned a lot about flight planning & really enjoyed the positive vibes and excitement!
More on their website: lnkd.in/dWvANupz
Finally, I made it! The aurora was so bright that it was easily visible to the naked eye, not just on camera!
October 11, 2025 at 11:53 PM
Finally, I made it! The aurora was so bright that it was easily visible to the naked eye, not just on camera!
Made it to Kiruna to join the U Oslo's CELLO Arctic EarthCARE validation campaign for a week
www.mn.uio.no/geo/english/...
www.mn.uio.no/geo/english/...
October 6, 2025 at 7:10 AM
Made it to Kiruna to join the U Oslo's CELLO Arctic EarthCARE validation campaign for a week
www.mn.uio.no/geo/english/...
www.mn.uio.no/geo/english/...
Some more memories from my September mountain trip and mountain boundary layer: clouds filling the valley and climbing up toward us
October 2, 2025 at 12:05 PM
Some more memories from my September mountain trip and mountain boundary layer: clouds filling the valley and climbing up toward us
Finally, coming back to the evolution and the journey of ice crystals. We can tear that apart with the help of the "time after convection tracer". Caveat: Can we do something similar with observations? Such analysis will become even more useful at that point [I don't have a good answer to this one]
September 16, 2025 at 9:03 AM
Finally, coming back to the evolution and the journey of ice crystals. We can tear that apart with the help of the "time after convection tracer". Caveat: Can we do something similar with observations? Such analysis will become even more useful at that point [I don't have a good answer to this one]
We can tear the origins apart. The model produces lots of situ cirrus, but they are very thin, contributing only a little to the total TOA energy budget.
September 16, 2025 at 9:03 AM
We can tear the origins apart. The model produces lots of situ cirrus, but they are very thin, contributing only a little to the total TOA energy budget.
But the novelty here is the use of passive tracers to get to:
1. anvil cloud "age"
2. distinguish between convective-origin (anvils) and in situ origin cirrus (formed by ice nucleation on gravity waves)
1. anvil cloud "age"
2. distinguish between convective-origin (anvils) and in situ origin cirrus (formed by ice nucleation on gravity waves)
September 16, 2025 at 9:03 AM
But the novelty here is the use of passive tracers to get to:
1. anvil cloud "age"
2. distinguish between convective-origin (anvils) and in situ origin cirrus (formed by ice nucleation on gravity waves)
1. anvil cloud "age"
2. distinguish between convective-origin (anvils) and in situ origin cirrus (formed by ice nucleation on gravity waves)
But only proper input, particularly updrafts in combination with humidity, can lead to reasonable cloud properties. If you are interested in thin cirrus, you may need to go to well beyond km scales to get that right. For fresh anvils, however, 1-4 km may be sufficient (not shown here).
September 16, 2025 at 9:03 AM
But only proper input, particularly updrafts in combination with humidity, can lead to reasonable cloud properties. If you are interested in thin cirrus, you may need to go to well beyond km scales to get that right. For fresh anvils, however, 1-4 km may be sufficient (not shown here).
We achieved that in 3 steps that basically don't add up any additional cost to the model. All just quick fixes, not super novel, but simple to implement so you may want to do something similar (or better?)!
September 16, 2025 at 9:03 AM
We achieved that in 3 steps that basically don't add up any additional cost to the model. All just quick fixes, not super novel, but simple to implement so you may want to do something similar (or better?)!
We are happy with the updated SAM-P3ice cloud-resolving model's ability to simulate tropical cirrus (both convective and non-convective = in situ origin)
September 16, 2025 at 9:03 AM
We are happy with the updated SAM-P3ice cloud-resolving model's ability to simulate tropical cirrus (both convective and non-convective = in situ origin)
Here the teaser movie...see later more for explanation
September 16, 2025 at 9:03 AM
Here the teaser movie...see later more for explanation
We studied the journey of ice crystals from deep convective cores to thin cirrus (and those formed by ice nucleation too) in a km-scale model
acp.copernicus.org/articles/25/...
@univie.ac.at
acp.copernicus.org/articles/25/...
@univie.ac.at
September 16, 2025 at 9:03 AM
We studied the journey of ice crystals from deep convective cores to thin cirrus (and those formed by ice nucleation too) in a km-scale model
acp.copernicus.org/articles/25/...
@univie.ac.at
acp.copernicus.org/articles/25/...
@univie.ac.at
Last week at the Italy–France border: moist valley air rising and forming near-surface clouds, while a higher cloud layer (with a cloud base of around 3,500 metres) tries to grow by convection, but fails to reach the rain stage. Beautiful!
September 15, 2025 at 6:32 AM
Last week at the Italy–France border: moist valley air rising and forming near-surface clouds, while a higher cloud layer (with a cloud base of around 3,500 metres) tries to grow by convection, but fails to reach the rain stage. Beautiful!
Nice storm over Vienna now, though with some more rotation at low levels could be even nicer...
July 24, 2025 at 3:47 PM
Nice storm over Vienna now, though with some more rotation at low levels could be even nicer...
lots of shallow convective weather for me recently
July 19, 2025 at 8:11 PM
lots of shallow convective weather for me recently
And the @bokuvienna.bsky.social radar capturing it met.boku.ac.at/wetter/radar...
June 7, 2025 at 12:54 PM
And the @bokuvienna.bsky.social radar capturing it met.boku.ac.at/wetter/radar...
June 7, 2025 at 12:51 PM
and the associated radar picture
May 26, 2025 at 6:45 PM
and the associated radar picture
While preparing for teaching on deep convection tomorrow...I managed to capture this nice shelf cloud approaching NW Vienna; see also how clouds at different altitudes travel in different directions => wind shear
May 26, 2025 at 6:44 PM
While preparing for teaching on deep convection tomorrow...I managed to capture this nice shelf cloud approaching NW Vienna; see also how clouds at different altitudes travel in different directions => wind shear
I am currently in my home country for work (ashpc.eu/event/25/), which is a rare occurrence, and I would like to draw your attention to a typical hayrack design used here called a "kozolec."
en.wikipedia.org/wiki/Hayrack
You can see one very near the meeting venue in the picture before
en.wikipedia.org/wiki/Hayrack
You can see one very near the meeting venue in the picture before
May 20, 2025 at 10:20 AM
I am currently in my home country for work (ashpc.eu/event/25/), which is a rare occurrence, and I would like to draw your attention to a typical hayrack design used here called a "kozolec."
en.wikipedia.org/wiki/Hayrack
You can see one very near the meeting venue in the picture before
en.wikipedia.org/wiki/Hayrack
You can see one very near the meeting venue in the picture before
I realized I didn't post any clouds to cover bluesky since a while, so a nice evening "cloud zoo" from today; note the cool virga.
May 16, 2025 at 9:02 PM
I realized I didn't post any clouds to cover bluesky since a while, so a nice evening "cloud zoo" from today; note the cool virga.