Orographic Cirrus and Its Radiative Forcing in NCAR CAM6

Lyu, Kai; Liu, Xiaohong; Bacmeister, Julio; Zhao, Xi; Lin, Lin; Shi, Yang; Sourdeval, Odran

Type de document :

Article dans une revue scientifique: Article original

DOI :

10.1029/2022jd038164

URL permanente :

http://hdl.handle.net/20.500.12210/84385

Titre :

Orographic Cirrus and Its Radiative Forcing in NCAR CAM6

Auteur(s) :

Lyu, Kai [Auteur]
Liu, Xiaohong [Auteur]
Bacmeister, Julio [Auteur]
Zhao, Xi [Auteur]
Lin, Lin [Auteur]
Shi, Yang [Auteur]
Sourdeval, Odran [Auteur]

Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518

Titre de la revue :

Journal of Geophysical Research: Atmospheres

Nom court de la revue :

JGR Atmospheres

Numéro :

128

Éditeur :

American Geophysical Union (AGU)

Date de publication :

2023-05-11

Résumé en anglais : [en]

Cirrus clouds play an important role in the Earth's radiative energy budget, thereby affecting the climate state and climate change. Orographic gravity wave (OGW)-induced sub-grid scale vertical velocity (i.e., cooling ...
Lire la suite >Cirrus clouds play an important role in the Earth's radiative energy budget, thereby affecting the climate state and climate change. Orographic gravity wave (OGW)-induced sub-grid scale vertical velocity (i.e., cooling rate) is not resolved by large-scale models and its impact on ice formation in cirrus clouds is not well quantified. In this study, one sub-grid scale OGW scheme (e.g., McFarlane) is used in the Community Atmosphere Model version 6 (CAM6) to generate vertical velocity variance (σw) for cirrus formation. Results from the default model and simulations with the OGW-induced σw are evaluated against the DOE ARM Small Particles in Cirrus (SPARTICUS) campaign observations. The OGW based on the McFarlane scheme increases the sub-grid scale σw over mountains compared to the default model and improves the model agreement with the SPARTICUS observations. Larger σw due to OGWs can trigger more frequent homogeneous nucleation in orographic cirrus and generates a higher number concentration of ice crystals observed during the SPARTICUS campaign. Moreover, our evaluation of the model simulations against satellite observations indicates that the McFarlane scheme generates high in-cloud ice number concentrations (>200 L−1) in the upper troposphere over mountains and high plateaus at mid- and high-latitudes of the winter hemisphere as shown in the observations. More ice crystals with smaller sizes absorb more infrared radiation (+0.523 ± 0.125 W m−2). The net radiative cloud forcing change at the top of the atmosphere is +0.330 W m−2 due to the orographic cirrus.Lire moins >

Comité de lecture :

Oui

Audience :

Non spécifiée

Établissement(s) :

Université de Lille
CNRS

Collections :

Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518

Équipe(s) de recherche :

Interactions Rayonnement Nuages (IRN)

Date de dépôt :

2023-06-08T09:26:40Z

Fichiers

JGR Atmospheres - 2023 - Lyu - Orographic Cirrus and Its Radiative Forcing in NCAR CAM6.pdf
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Numéro de version	Lien	Date de modification
2	20.500.12210/84385	2023-10-27T07:25:47Z
1	20.500.12210/84385.1*	2023-06-08T09:26:40Z

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