CESOC kindly invites you to another Colloquium by Dr. Raphaela Vogel from the University of Hamburg.

Date: 13 June 2023,
Time: 13:30 CEST
Location: Lecture Hall 4.001, Pohligstr. 3, 50969 Cologne

It will also be streamed via zoom:
for online participation, please contact info@cesoc.net

——————————–

Strong cloud–circulation coupling explains weak trade cumulus feedback

Shallow cumulus clouds in the trade-wind regions cool the planet by reflecting solar radiation. The response of trade cumulus clouds to climate change is a key uncertainty in climate projections. Trade cumulus feedbacks in climate models are governed by changes in cloud fraction near cloud base, with high-climate-sensitivity models suggesting a strong decrease in cloud-base cloudiness owing to increased lower-tropospheric mixing. Here we show that new observations from the EUREC4A (Elucidating the role of cloud-circulation coupling in climate) field campaign refute this mixing-desiccation hypothesis. We find the dynamical increase of cloudiness through mixing to overwhelm the thermodynamic control through humidity. Because mesoscale motions and the entrainment rate contribute equally to variability in mixing but have opposing effects on humidity, mixing does not desiccate clouds. The magnitude, variability and coupling of mixing and cloudiness differ markedly among climate models and with the EUREC4A observations. Models with large trade cumulus feedbacks tend to exaggerate the dependence of cloudiness on relative humidity as opposed to mixing and also exaggerate variability in cloudiness. Our observational analyses render models with large positive feedbacks implausible and both support and explain at the process scale a weak trade cumulus feedback. Our findings thus refute an important line of evidence for a high climate sensitivity.

——————————–

photo: MPI-M / Diallo

We are excited to invite you to become a member and actively participate in CESOC community.

Please formally register for a membership by requesting and filling the short application form from

info@cesoc.net;

if you fulfill the membership requirements:

1. working scientifically in one of the CESOC associated research fields: Earth and Environmental Sciences, Computer Science, Mathematics

2. employed at either the Universities of Bonn, Cologne or the Research Centre Jülich.

Our first general Members’ Assembly will be held on Friday, 16 June 2023. This first get-together will constitute the starting point of a flourishing network that we will build together.

We are also expecting a few guests from ECMWF, including our guest speaker Jean-Noël Thépaut, Director of Copernicus Services and Head of the ECMWF site in Bonn.

The date for the first Member’s Assembly is approaching very fast and we would be happy if as many of you would be able to join us there. Therefore we would like to encourage you to send your registration form before 31.05.2023.

For more information on the CESOC membership and its implications, please don’t hesitate to ask us (info@cesoc.net).

CESOC kindly invites you to another Colloquium by Dr. Annika Vogel from the Canadian Weather Service “Environment and Climate Change Canada”.

Date: 19 June 2023,
Time: 15:30 CEST
Location: Lecture Hall 4.001, Pohligstr. 3, 50969 Cologne

It will also be streamed via zoom:
for online participation, please contact info@cesoc.net

——————————–

Atmospheric research for Canada and the problem of accurate error estimation

This talk is divided into two parts: The first part gives a general introduction to atmospheric research for Canada. Different challenges for atmospheric research are described which arise from the unique conditions in the country. It also includes a short overview of the Canadian environmental agency ‘Environment and Climate Change Canada’ (ECCC). Motivated by this general introduction, the second part introduces two different approaches which address the problem of accurate error estimation of atmospheric data. The first one is a statistical approach, which makes use of the increasing amount of overlapping data of any kind. The second one is a dynamical approach, which explicitly evolves error parameters of a prognostic model over time. The potentials and limitations of the two approaches are discussed in the context of data assimilation.

CESOC continues the seminar series “My Research” this summer term 2023 with

Prof. Dr. Harrie-Jan Hendricks-Franssen

from the Institute for Bio- and Geosciences (IBG), Research Centre Jülich,
talking on their research

– coming soon –

Date: 30 June 2023
Time: 15:30 CEST
Place: Online

The talk lasts about 30 minutes with the possibility to ask questions afterwards.
It will be held via Zoom and is open to any interested person within the CESOC research disciplines (any Earth system sciences, mathematics or computer science).
Please contact info@cesoc.net, if you would like to participate.

You can find the complete schedule here.

CESOC continues the seminar series “My Research” this summer term 2023 with

Prof. Dr. Petra Friederichs

from the Institute of Geosciences – Meteorology Section, University of Bonn,
talking on their work

Extreme Weather and Climate Events: Statistical Modelling and Prediction

Date: 14 July 2023
Time: 15:30 CEST
Place: Online

The talk lasts about 30 minutes with the possibility to ask questions afterwards.
It will be held via Zoom and is open to any interested person within the CESOC research disciplines (any Earth system sciences, mathematics or computer science).
Please contact info@cesoc.net, if you would like to participate.

You can find the complete schedule here.