New Cloud System Metrics to Assess Bulk Ice Cloud Schemes in a GCM
| Autor: | Marine Bonazzola, Sofia E. Protopapadaki, Ionela Musat, Claudia J. Stubenrauch |
|---|---|
| Přispěvatelé: | Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Global and Planetary Change
Ice cloud 010504 meteorology & atmospheric sciences Meteorology Cloud systems IR Sounder cloud observation simulator [SDU.STU]Sciences of the Universe [physics]/Earth Sciences GCM transcription factors 010502 geochemistry & geophysics 01 natural sciences lcsh:Oceanography 13. Climate action Cloud System Metrics for process‐oriented diagnostics bulk ice cloud scheme for climate models General Earth and Planetary Sciences Environmental Chemistry Environmental science Astrophysics::Earth and Planetary Astrophysics lcsh:GC1-1581 lcsh:GB3-5030 lcsh:Physical geography Astrophysics::Galaxy Astrophysics Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences |
| Zdroj: | Journal of Advances in Modeling Earth Systems Journal of Advances in Modeling Earth Systems, American Geophysical Union, 2019, ⟨10.1029/2019MS001642⟩ Journal of Advances in Modeling Earth Systems, Vol 11, Iss 10, Pp 3212-3234 (2019) |
| ISSN: | 1942-2466 |
| DOI: | 10.1029/2019MS001642⟩ |
| Popis: | International audience; Bulk microphysical properties of ice clouds, such as fall speed and ice crystal size distribution, strongly impact the life time and the radiative effects of these clouds. Three coherent bulk ice schemes, with fall speed and effective ice crystal diameter depending on both ice water content and temperature, have been constructed from published parameterizations. We present a novel upper tropospheric cloud system concept to study the impact of these schemes on the LMDZ climate simulations. For this evaluation, cloud data from hyperspectral infrared sounders Atmospheric InfraRed Sounder and IR Atmospheric Sounding Interferometer are used, because they include cirrus with visible optical depths as low as 0.2. The analogous satellite observation simulator, developed for this purpose, is also presented. The cloud system concept, applied to the data and to the simulator outputs, allows a process‐oriented evaluation. In general, the new bulk ice schemes lead to a better agreement with the cloud data, in particular concerning the cloud system property distributions and the relation between cloud system properties and proxies mimicking the life stage and the convective depth. Sensitivity studies have demonstrated that both the introduction of the new schemes as well as the necessary adjustment of the relative width of the upper tropospheric subgrid water distribution lead to these improvements. Our studies also suggest to revise the formulation of the latter. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text