Jenna Ritvanen

Doing rainfall nowcasting at @FMISpace, PhD student at @helsinkiuni. she/her

[Jenna Ritvanen @ritvje]

Our article on a new model called L-CNN for nowcasting convective rainfall is now out in IEEE J-STARS! This is the first article in my PhD project related to rainfall nowcasting with dual-pol radar data & machine learning @FMIspace https://t.co/NAi53hr6Rv

[Pavlos Kollias @doppler_fan]

Final day of the radar summer school. An incredible group of students and mentors. The "drizzle" project won the competition. Many thanks to the remote participants. I hope we will have the chance to do this again in 2 years @armnewsteam @NSF @BrookhavenLab @SoMAS @stonybrooku

[Ilmatieteen laitos @IlmaTiede]

Esimerkiksi näin parannetaan sään ennustamista tutkimuksen keinoin: tutkijat kehittivät koneoppimiseen perustuvan mallin, joka soveltuu erityisesti voimakkaan ja nopeasti kehittyvän kuurosateen ennustamiseen. 🌧️

#Tutkimus #Sää #Sade #Koneoppiminen

https://t.co/67wxL2LdWF

[Jenna Ritvanen @ritvje]

In addition to the open-access article, the code for the model is also openly available at Github: https://t.co/uygjypAJBv

[Jenna Ritvanen @ritvje]

Our article on a new model called L-CNN for nowcasting convective rainfall is now out in IEEE J-STARS! This is the first article in my PhD project related to rainfall nowcasting with dual-pol radar data & machine learning @FMIspace https://t.co/NAi53hr6Rv

[Jenna Ritvanen @ritvje]

As a conclusion, limiting the CNN only to nowcasting only the growth and decay of rainfall improves forecasts!

[Jenna Ritvanen @ritvje]

This approach retains high rain rate values better than the original CNN model which improves nowcasting skill especially at higher rain rate thresholds. At small scales the L-CNN is even slightly better than the LINDA model (https://t.co/saqErnY5Aq)

[Jenna Ritvanen @ritvje]

@ScottGiangrande We didn't measure spectra, but you could definitely filter insects/birds with Doppler velocity variance and polarimetric variables, like here https://t.co/LqLg891tdg

[Jenna Ritvanen @ritvje]

My 1st first-author paper is now out in Atmospheric Measurement Techniques! We look at how well lidar & radar measure wind in different weather conditions using co-located measurements from Finland @FMIspace @VaisalaSuomi @HelsinkiRadar
https://t.co/JdCGYiXFs2

[Jenna Ritvanen @ritvje]

@ScottGiangrande For these measurements, insects actually were quite passive tracers, there was no big bias in clear air for radar. Maybe because they're small enough?

[Jenna Ritvanen @ritvje]

Overall, if you need wind measurements in all weather conditions, combining measurements from both instruments should increase measurement performance significantly!

[Jenna Ritvanen @ritvje]

In our measurements, unsurprisingly: lidar does well in clear air, radar in rain. But also
1⃣ Lidar performance starts decreasing when air is too clear
2⃣ Radar can also measure in clear air if insects are present, just make sure 🦟 don't cause a bias in wind measurements

[Victoria Sinclair @VSinclair_Met]

Our new paper where investigate the BL height and stability in Hyytiälä, southern Finland using radiosondes, a microwave radiometer and ERA5 reanalysis is now accepted:
https://t.co/LHoM1jKEEu
@INAR_fin @HelsinkiRadar (1/4)

[Python ARM Radar TK @Py_ART]

Give our latest release a try!! 😁
Highlights:
🗄️ Improved IO functionality (@ritvje)
📡 Support for reading in RXM-25 files (@tornatrix)
🪓 Radar image splitting functionality (@lauratomkinsWX)
📊 Various plotting bug fixes
📜 Updated references + docs
https://t.co/mdPkxzcVbd

[Victoria Sinclair @VSinclair_Met]

Our paper is now available for discussions in AMTD - go and check it out and let us know what you think!

Boundary-layer height and surface stability at SMEAR II, Hyytiälä, Finland in ERA5 and observations https://t.co/K7NIpfN1Zn

@INAR_fin @KumpulaScience @CostProbe

[Norppalivebot 2.0 @norppalivebot]

Joskus on rankkaa olla norppa. Tällä kertaa västäräkki häiritsee Pullervon unia

#norppalive #luontolive

[Jenna Ritvanen @ritvje]

@Uusimaa_Partio delegaatiomme uuteen strategiaan jättämämme muutosehdotus tai ponsi eivät menneet läpi. Asiasta käytiin kuitenkin arvokasta keskustelua joka varmasti vie järjestöä ja partiota eteenpäin! Kiitos osallistujille #jäsenmöte #partioscout

[Jenna Ritvanen @ritvje]

Jokaisella partiolaisella ja lippukunnalla pitää olla mahdollisuus resursseista riippumatta osallistua #ilmastonmuutos torjuntaan partiossa #partioscout #jäsenmöte