Jacob Perez
@FluidsJacob
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PhD student researching regime behaviour of the polar jet stream. Part of the CDT in Fluid Dynamics at the University of Leeds.
Leeds
Joined June 2020
Our new paper led by @FluidsJacob suggests a method to diagnose the North Atlantic jet using moment analysis: https://t.co/xmsmCgwpEB Really pleased to see this work finally come out. We hope it will be used by others. Well done Jacob! @ICASLeeds
wcd.copernicus.org
Abstract. We develop a novel technique for characterising the latitude (ϕ‾), tilt (α) and intensity (Umean) of the North Atlantic eddy-driven jet using a feature identification method and two-dimen...
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Discussion open for comments on @EgUsphere: Minimal influence of future Arctic sea ice loss on North Atlantic jet stream morphology
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Weak eddy feedback has been proposed to explain the NAO signal-to-noise problem. Our new study highlights limitations of the diagnostic used in some earlier studies and question the interpretation in past work @mckennach @CONSTRAIN_EU @ICASLeeds
https://t.co/lBKWtA541l
agupubs.onlinelibrary.wiley.com
The “eddy feedback parameter” is a highly non-stationary quantity, making reanalysis and model comparisons problematic on short time periods Sampling uncertainty in the eddy feedback parameter fr...
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Discussion open for comments on @EgUsphere: A new characterization of the North Atlantic eddy-driven jet using 2-dimensional moment analysis
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By considering different Jet characteristics, leads to different surface impacts! Below is a plot of the rainfall (blue-wetter, brown -drier) where the tilt is increasing from left to right. Changes in the tilt lead to different wet and dry areas in Europe. (3/3) #CDTTweCon
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In my work we have developed a new way to characterise the Jet, by extracting what we call Jet objects from the wind data. The Jet position (blue dot), tilt and strength are all calculated by using the winds within Jet object. (2/3) #CDTTweCon
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The Jet stream is a band of winds coming the west, that has large impacts on our surface weather. My research involves developing new methods to characterise the jet position, strength and tilt and how these features alter the location of extreme weather (1/3). #CDTTweCon
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Thanks to everyone that came to my talk yesterday. Look out for the paper in the near future! #iugg2023
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@FluidsJacob presenting his interesting work developing a new approach for diagnosing the North Atlantic eddy driven jet at #iugg2023 @CDTFluidsLeeds @ICASLeeds
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Congratulations! Zhi-Ming Yuan, Minglu Chen, Laibing Jia, Chunyan Ji & Atilla Incecik on winning the The 2022 Ig Nobel Physics Prize for the article WAVE-RIDING AND WAVE-PASSING BY DUCKLINGS IN FORMATION SWIMMING Read the #openaccess article in #JFM ☑️ https://t.co/ppanD1Y9RB
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WALL OF WATER! 🌧️👀 Crazy time-lapse today showing severe weather with heavy rain and strong wind blowing into Fort Myers, Florida. Looks like the Mothership! @WINKNews @StormHour @StephanieAbrams @JimCantore
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The 2nd part of our @AMSJCLi study on drivers of biases in CMIP6 storm tracks was recently accepted and now available online! In this part we looked into the Southern Hemisphere and tried to understand the influence of SSTs and temperature gradients ⤵️ https://t.co/v3HOuPqNtp
journals.ametsoc.org
Abstract The Southern Hemisphere storm tracks are commonly simulated too far equatorward in climate models for the historical period. In the latest generation of climate models from phase 6 of the...
In a new paper we've looked at the representation of storm tracks/cyclones in coupled and atmosphere-only models from #CMIP6. We've been able to determine what biases are a result of SST biases/forcing, and their origins. Now available in @AMSJCLi
https://t.co/mP50Ijq5Um
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Since folk have asked, here's how the jet has been in July - bent north over W. Europe, setting the scene for the heatwave to develop to its south. In the UK the jet has protected us from most of it, but it just let a little of the hot air slip north. (anyone notice? 😉)
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The 1976 heatwave was very different in character to the short, sharp event of this week, and there are a few other interesting comparisons: 1/4
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Just published: Schwartz, Garfinkel et al, incl @Priyanka_AY: Model biases in extratropical stationary wave patterns lead to significant forecast errors. Improving on these biases will likely improve the long-range prediction of extreme events.
New research article: Stationary wave biases and their effect on upward troposphere– stratosphere coupling in sub-seasonal prediction models
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Whoop!🙌 Fluids Symposium 22 @UniversityLeeds Leeds was a great success! Fantastic speakers, great attendance and really well organised by the postgraduate team @rm_collet @MichaelMacRaild @FluidsJacob 👏
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The elegant weather maps by @burgwx point out that the mid-June European heatwave is "partnered" with two other anomalously hot areas: one SE of Greenland, the other over Middle East ♨️ These hot spells are joined by a single, NW-SE oriented Rossby wave packet in the jet stream〰️
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Open day @UniofReading - rotating tank experiment in fluids lab in meteorology department illustrating Taylor columns and delayed dissipation of coherent structures
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End of a great week at the storm tracks conference in Oléron. Lots of interesting science and good discussions. Looking forward to the next one! #oleron #stormtracks
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