Article
Environmental Sciences
Marc Prange, Stefan A. A. Buehler, Manfred Brath
Summary: This study assesses the representation of elevated moist layers (EMLs) in ERA5 reanalysis, IASI L2 retrieval Climate Data Record (CDR), and the AIRS-based CLIMCAPS-Aqua L2 retrieval. The results show that ERA5 is a suitable reference dataset for investigating EMLs, while IASI L2 retrieval exhibits stronger smoothing and CLIMCAPS L2 retrieval has biases in its vertical humidity structure.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Meteorology & Atmospheric Sciences
B. Ribstein, C. Millet, F. Lott, A. de la Camara
Summary: A multiwave non-orographic gravity wave scheme is adapted to represent waves of small intrinsic phase speed and wave emission from all altitudes. The scheme performs well in a general circulation model, but has limitations in the vertical propagation of inertial waves.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Walter Hannah, Kyle Pressel
Summary: An unphysical checkerboard pattern has been identified in the Energy Exascale Earth System Model, and a method has been proposed to address this issue. Simulation results show that the method effectively reduces the occurrence of checkerboard patterns at different timescales.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Optics
Xiaodan Hu, Xiaoqing Wu, Qike Yang, Yiming Guo, Zhiyuan Wang, Chong Yan, Zhi Qiao, Chun Qing, Xuebin Li, Xianmei Qian
Summary: The vertical profile of optical turbulence is crucial for the design of astronomical telescopes and adaptive optics instruments. This study examined the impact of different estimation methods and resolution data on estimating the refractive index structure constant (Cn2) in Huaihua, Hunan. The Thorpe method consistently outperformed Dewan and HMNSP99 methods in estimating Cn2, with higher correlation coefficients (RXY) and lower root mean square error (RMSE) and mean relative error (MRE). The results also showed that HMNSP99 was more sensitive to data resolution and the temperature gradient played a smaller role in high-altitude turbulence. When using ERA5 data, Dewan and HMNSP99 had similar results, suggesting that wind shear is the primary factor when the data resolution is reduced.
Article
Meteorology & Atmospheric Sciences
B. Khouider, B. B. Goswami, R. Phani, A. J. Majda
Summary: Cumulus parameterization in global climate models is based on the quasi-equilibrium assumption, which is not compatible with the organization and dynamical interactions of cloud systems. Recently, novel ideas such as the stochastic multicloud model have emerged to represent the key processes of moist convection-large-scale interaction. By modifying the Zhang-McFarlane parameterization, the stochastic multicloud model introduces a stochastic ensemble of plumes to better simulate organized tropical convection.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Meteorology & Atmospheric Sciences
Wei Wei, Xindong Peng, Yanluan Lin, Jianduo Li, Guo Zhang, Yang Yang, Jingchao Long
Summary: The new scale-aware algorithm (SA-UW) developed based on the University of Washington Moist Turbulence scheme adequately reproduces sub-grid turbulence transport at gray-zone scales, vastly improving the distribution and intensity of coherent structures. This new method demonstrates its scale-aware capability by recovering the conventional UW scheme when grid spacing is larger than the turbulence length scale.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
T. Radko, I Kamenkovich
Summary: This study investigates the impact of delayed adjustment of eddy-induced fluxes on parameterizations. By reinterpreting a principle from Maxwell's theory, the research finds that incorporating the delay effect can significantly improve the results of eddy parameterizations.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Junbiao Tu, Daidu Fan, Zhiyu Liu, William Smyth
Summary: This study obtained estimates of the flux Richardson number R-f in a strongly turbulent, sediment-stratified estuarine flow. The parameterization based on the turbulent Froude number Fr-t was found to be the most effective.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
P. A. Bogenschutz, C. Eldred, P. M. Caldwell
Summary: We developed a doubly periodic version of the Simple Convection-Permitting E3SM Atmosphere Model to improve the efficiency of this global convection permitting model. The design details and case library associated with this doubly periodic configuration are explained. Our findings indicate that the doubly periodic cloud resolving model can be used to explore the horizontal resolution sensitivity of global convection permitting models and replicate biases observed in global models.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Meteorology & Atmospheric Sciences
Peter A. Bogenschutz, Takanobu Yamaguchi, Hsiang-He Lee
Summary: Increasing the vertical resolution gradually has some impact on the simulation of boundary layer clouds, with significant positive effects observed when the vertical resolution approaches that typically used in large eddy simulation. However, these simulations are burdened with excessive computational cost and some processes and parameterizations are sensitive to changes in the vertical resolution.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2021)
Article
Optics
Xiaohui Wang, Yang Wang, Shuai Mao, Yongze Yu, Haoyu Gu, Dongdong Deng, Yingxiong Song, Fufei Pang, Liyun Zhuang, Song Yang, Xiaofeng He, Dandan Wei, Yudong Yang
Summary: To address the upcoming famine of channel capacity, optical orbital angular momentum (OAM) has been proposed for space-division multiplexing (SDM). However, atmospheric turbulence (AT) severely impacts the performance of OAM-based free-space optical communication (FSOC) due to crosstalk induced by distorted helical phase. A synthesizing-crosstalk method is proposed to mitigate AT by using an OAM-probe beam (OPB) that has the same mode as the propagated OAM-data beam (ODB). Experimental results show that the proposed scheme improves the bit error rate (BER) and constellation plot (CP) of the OAM channels under different AT conditions, making it feasible for future OAM-based FSOC.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
Marguerite L. Brown, Olivier Pauluis, Edwin P. Gerber
Summary: Our understanding of midlatitude atmospheric motion mainly comes from two-layer quasigeostrophic (QG) models, but these models traditionally ignore moisture, which accounts for a significant amount of atmospheric energy. With the expected increase in atmospheric moisture due to global warming, understanding how moisture affects atmospheric dynamics is crucial. By using a two-layer moist QG model, we analyze the impacts of latent heat release and large-scale moisture gradients on the scaling of midlatitude synoptic systems. The results show that saturation shifts the most unstable mode to smaller scales, increases growth rates, and extends the inverse cascade to larger scales.
JOURNAL OF THE ATMOSPHERIC SCIENCES
(2023)
Article
Environmental Sciences
Ryan L. Li, Joshua H. P. Studholme, Alexey Fedorov, Trude Storelvmo
Summary: This study uses the concept of precipitation efficiency to establish the critical role of raindrops in predicting future tropical atmospheric circulation and extreme precipitation.
NATURE CLIMATE CHANGE
(2022)
Article
Meteorology & Atmospheric Sciences
Rainer V. J. Hilland, Christian Bernhofer, May Bohmann, Andreas Christen, Marwan Katurji, Gillian Maggs-Kolling, Matthias Krauss, Jarl A. Larsen, Eugene Marais, Andrea Pitacco, Benjamin Schumacher, Robert Spirig, Nadia Vendrame, Roland Vogt
Summary: The Namib Turbulence Experiment aimed to investigate heat transfer between subsurface, surface, and atmosphere in the Namib Desert, using a variety of instruments to measure temperature fluctuations and other variables. The experiment revealed the spatial and temporal patterns of heat exchange in the desert, providing valuable insights for weather forecasting and climate modeling.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2022)
Article
Meteorology & Atmospheric Sciences
Temple R. Lee, Tilden P. Meyers
Summary: Recent research has shown that bulk-Richardson parameterizations for various fluxes have similar or better performance compared to Monin-Obukhov similarity theory (MOST). This study expanded upon new Ri(b) parameterizations and developed turbulence statistics parameterizations. The results indicate that the Ri(b) relationships generally performed better than MOST in determining the variability of temperature, moisture, and wind. This suggests the potential use of Ri(b)-based parameterizations in weather forecasting models.
MONTHLY WEATHER REVIEW
(2023)