Treatment of Key Aerosol and Cloud Processes in Earth System Models – Recommendations from the FORCeS Project
Abstrak
In honour of the memory of Prof. Astrid Kiendler-Scharr and her contributions to atmospheric science Uncertainty in estimations of the net contribution of anthropogenic aerosol particles, particularly of aerosol-cloud interactions (ACIs) to the Earth’s radiation budget, limits our ability to understand past and project future climate change. Earth System Models (ESMs) are among the key tools for assessing the magnitude and impacts of changes in various forcing agents on the global climate system. Hence, improving aerosol and cloud descriptions in ESMs is an important way forward to increase the confidence in estimates of climate impacts of aerosol perturbations in the past, present and future. In the framework of the FORCeS project, experimental and theoretical approaches were combined to bridge the current key gaps in the fundamental understanding of essential aerosol and cloud processes and their descriptions in selected European ESMs. Regarding aerosol types and processes, we focused on organic aerosol, particulate nitrate, absorbing aerosols, and ultrafine aerosol sources including new particle formation and growth. In terms of cloud processes, we targeted cloud droplet activation, hydrometeor growth and evaporation, ice formation and multiplication as well as aerosol processing and scavenging by clouds. The selection was made based on the identified knowledge gaps in the scientific understanding of these processes and/or their current representation in ESMs, as well as a novel perturbed parameter ensemble approach to detecting potential structural deficiencies in an ESM. Here, we review the state-of-the-art, outline our approach for arriving at recommendations for improving the representation of key aerosol and cloud processes within ESMs, and then provide such recommendations applicable in models operating at the Earth system scale. The limitations of the recommendations, applicability, as well as alternative approaches and future research directions are discussed. Overall, the findings highlight the need for continuous efforts towards smart ways for representing the aerosol number size distribution as well as consistent representations of key parameters (e.g., liquid water content and cloud droplet number concentration). Furthermore, we provide guidance for future ESM evaluation emphasising, in particular, the need for exploring the consistency of key parameters, process-based (as opposed to parameter-based), and the complementarity of in-situ and remote-sensed measurements for model evaluation.
Topik & Kata Kunci
Penulis (62)
Ilona Riipinen
Sini Talvinen
Anouck Chassaing
Paraskevi Georgakaki
Xinyang Li
Carlos Pérez García-Pando
Tommi Bergman
Snehitha M. Kommula
Ulrike Proske
Angelos Gkouvousis
Alexandra P. Tsimpidi
Marios Chatziparaschos
Almuth Neuberger
Vlassis A. Karydis
Silvia M. Calderón
Sami Romakkaniemi
Daniel G. Partridge
Théodore Khadir
Lubna Dada
Twan van Noije
Stefano Decesari
Øyvind Seland
Paul Zieger
Frida Bender
Ken Carslaw
Jan Cermak
Montserrat Costa-Surós
Maria Gonçalves Ageitos
Yvette Gramlich
Ove W. Haugvaldstad
Eemeli Holopainen
Corinna Hoose
Oriol Jorba
Stylianos Kakavas
Maria Kanakidou
Harri Kokkola
Radovan Krejci
Thomas Kühn
Markku Kulmala
Philippe Le Sager
Risto Makkonen
Stella E. I. Manavi
Thomas F. Mentel
Alexandros Milousis
Stelios Myriokefalitakis
Athanasios Nenes
Tuomo Nieminen
Spyros N. Pandis
David Patoulias
Tuukka Petäjä
Johannes Quaas
Leighton Regayre
Susanne M. C. Scholz
Michael Schulz
Ksakousti Skyllakou
Ruben Sousse
Philip Stier
Manu Anna Thomas
Julie T. Villinger
Annele Virtanen
Klaus Wyser
Annica M. L. Ekman
Akses Cepat
- Tahun Terbit
- 2026
- Sumber Database
- DOAJ
- DOI
- 10.16993/tellusb.1883
- Akses
- Open Access ✓