Kristoffer Aalstad

Researcher @unioslo_mn. Working on snow, permafrost, meteorology, data assimilation, and remote sensing.

[Kristoffer Aalstad @krisaalstad]

New #OpenAccess paper in GRL @theAGU led by the indomitable Norbert Pirk @norbert_nateko @spoton_fluxes using deep ensemble neural networks to disentangle permafrost carbon fluxes @CbaOslo @unioslo_mn @NIVAforskning @UCPH_Research @NORCEresearch @NTNU https://t.co/66PScUz9MC

[Biogeosciences @EGU_BioGeo]

Discussion open for comments on @EgUsphere: Inferring methane emissions from African livestock by fusing drone, tower, and satellite data https://t.co/AbjcLtYtiU

[Albert Pinto @70sBachchan]

“The market will solve climate”

The market:

[Simon Gascoin @sgascoin]

Was 2024 a good or bad snow year? Thread!

[Kristoffer Aalstad @krisaalstad]

New preprint in @EgUsphere led by trailblazing PhD candidate Marco Mazzolini on joint ICESat-2 #spacelaser snow depth and Sentinel-2 snow cover data assimilation with MuSA in the SNOWDEPTH @forskningsradet project @UiO_ResearchMN @NASA_ICE @CopernicusEU https://t.co/EfGlWyMlB9

[Kristoffer Aalstad @krisaalstad]

@theAGU @norbert_nateko @spoton_fluxes @CbaOslo @NIVAforskning @UCPH_Research @NORCEresearch @NTNU @numpy_team Although the idea of Bayesian neural networks and training them with ensemble Kalman (or other MC) methods is not new, it is a promising way to conduct probabilistic machine learning (see the great books by @sirbayes) with uncertainty quantification that we need in (geo)science

[Kristoffer Aalstad @krisaalstad]

New #OpenAccess paper in GRL @theAGU led by the indomitable Norbert Pirk @norbert_nateko @spoton_fluxes using deep ensemble neural networks to disentangle permafrost carbon fluxes @CbaOslo @unioslo_mn @NIVAforskning @UCPH_Research @NORCEresearch @NTNU https://t.co/66PScUz9MC

[Kristoffer Aalstad @krisaalstad]

@theAGU @norbert_nateko @spoton_fluxes @CbaOslo @NIVAforskning @UCPH_Research @NORCEresearch @NTNU The "deep ensemble" neural network was trained without backpropagation using ensemble Kalman techniques from geophysical data assimilation to perform (approximate) Bayesian inference of network parameters implemented in pure @numpy_team code here https://t.co/xOynUmmsov

[The Spot-On project @spoton_fluxes]

Disaggregating the Carbon Exchange of Degrading Permafrost Peatlands Using Bayesian Deep Learning https://t.co/97B2A7dKO1

[Centre for Biogeochemistry in the Anthropocene @CbaOslo]

Disaggregating the Carbon Exchange of Degrading Permafrost Peatlands Using Bayesian Deep Learning - Pirk - 2024 - Geophysical Research Letters - Wiley Online Library https://t.co/IZ4MHDa4n0

[Richard McElreath 🐈‍⬛ @rlmcelreath]

This talk (the Biblically accurate Bayesian -or- Bayes without Frequentist Language) was recorded and is available on the ytube now: https://t.co/P65BMdpv9T

[Kevin Patrick Murphy @sirbayes]

Stanley's probability textbook (https://t.co/QKOfdjV9jW) is fantastic, so I imagine this tutorial on diffusion is good as well. However, I am no longer of a fan of presenting the discrete time version - the flow matching interpretation seems more elegant.

[Sam Power @sp_monte_carlo]

this week, i will tweet some textbook recommendations.

for the books which i include, the basic criteria are that:

1) if i had found them earlier, i would have understood certain topics more quickly
2) they contributed to me liking the subject
3) i still enjoy reading them

[Simon Gascoin @sgascoin]

The SPOT satellites archive remains largely untapped. In this paper we show how to train a deep learning model to classify snow and clouds without reference data.. by emulating SPOT data from Sentinel-2 images. Unofficial name of the method: SPOTIFY. https://t.co/cXumvDgGnA

[Kevin Patrick Murphy @sirbayes]

To all who like this - what if I told you this book is not about the linear deterministic kind of SSM used by Mamba, S4, etc. but instead is about Bayesian inference in stochastic nonlinear dynamical models - would you still be interested?

[Chiel van Heerwaarden @Chiel1982]

By combining model development and observations from the @NWONieuws #SLOCS project and the @RuisdaelObserv, we created a cloud-resolving simulation with #MicroHH of The Netherlands with realistic boundary conditions derived from @ECMWF ERA5. Movie by @bartvstratum. @WUR.

[Kristoffer Aalstad @krisaalstad]

Working on data assimilation and inverse modeling for the terrestrial cryosphere? Consider applying to our EGU session @EuroGeosciences (deadline tomorrow!) https://t.co/uNCi9yCW5R

[Richard Alan John Davy @RDavy84]

Do you want to know what the snow conditions in Norway are forecast to be like in the coming months?

Our downscaling of ECMWF forecasts are now live on the Arctic Portal:
https://t.co/ph5AU6mRJS

6-month forecasts of snow depth and temperature will be updated every month.