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Investigating Mountain Watershed Headwater-To-Groundwater Connections, Water Sources, and Storage Selection Behavior With Dynamic-Flux Particle Tracking 利用动态水流粒子追踪技术调查山区流域的源头水与地下水连接、水源和蓄水选择行为
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-21 DOI: 10.1029/2023MS003976
P. James Dennedy-Frank, Ate Visser, Fadji Z. Maina, Erica R. Siirila-Woodburn

Climate change will impact mountain watershed streamflow both directly—with changing precipitation amounts and variability—and indirectly—through temperature shifts altering snowpack, melt, and evapotranspiration. To understand how these complex processes will affect ecosystem functioning and water resources, we need tools to distinguish connections between water sources (rain/snowmelt), groundwater storage, and exit fluxes (streamflow/evapotranspiration), and to determine how these connections change seasonally and as climate shifts. Here, we develop novel watershed-scale approaches to understand water source, storage, and exit flux connections using a dynamic-flux particle tracking model (EcoSLIM) applied in California's Cosumnes Watershed, which connects the Sierra Nevada and Central Valley. This work develops new visualizations and applications to provide mechanistic understanding that underpins the interpretation of isotopic field data at watershed scales to distinguish sources, flow paths, residence times, and storage selection. In our simulations, streamflow comes primarily from snow-derived water while evapotranspiration generally comes from rain. Most streamflow starts above 1,000 m while evapotranspiration is sourced relatively evenly across the watershed and is generally younger than streamflow. Modeled streamflow consists primarily of water sourced from precipitation in the previous 5 years but before the current water year, while ET consists primarily of water from precipitation in the current water year. ET, and to a lesser extent streamflow, are both younger than water in groundwater storage. However, snowmelt-derived streamflow preferentially discharges older water from snow-derived storage. Dynamic-flux particle tracking and new approaches presented here enable novel model-tracer comparisons in large-scale watersheds to better understand watershed behavior in a changing climate.

气候变化将直接影响山区流域的溪流--降水量和降水变化,以及间接影响--温度变化改变积雪、融雪和蒸发。为了了解这些复杂的过程将如何影响生态系统功能和水资源,我们需要一些工具来区分水源(降雨/融雪)、地下水储存和出口通量(溪流/蒸散)之间的联系,并确定这些联系如何随着季节和气候的变化而变化。在此,我们开发了新颖的流域尺度方法,利用动态通量粒子跟踪模型(EcoSLIM)了解水源、储水和出口通量之间的联系,该模型应用于连接内华达山脉和中央山谷的加利福尼亚科苏米斯流域。这项工作开发了新的可视化和应用软件,为解释流域尺度上的同位素现场数据提供了机制上的理解,从而区分水源、水流路径、停留时间和存储选择。在我们的模拟中,溪流主要来自雪水,而蒸发通常来自雨水。大部分溪流从海拔 1000 米以上开始,而蒸发蒸腾则相对均匀地来自整个流域,并且通常比溪流更年轻。模拟的溪流主要由前 5 年但在当前水年之前的降水量组成,而蒸散发主要由当前水年的降水量组成。蒸散发(其次是溪流)都比地下水储存水量年轻。然而,融雪形成的溪流更倾向于从积雪储水中排出较老的水。本文介绍的动态流量粒子跟踪和新方法可在大尺度流域中进行新颖的模型-示踪剂比较,从而更好地了解气候变化下的流域行为。
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引用次数: 0
Advancing Parsimonious Deep Learning Weather Prediction Using the HEALPix Mesh 利用 HEALPix 网格推进准深度学习天气预测
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-20 DOI: 10.1029/2023MS004021
Matthias Karlbauer, Nathaniel Cresswell-Clay, Dale R. Durran, Raul A. Moreno, Thorsten Kurth, Boris Bonev, Noah Brenowitz, Martin V. Butz

We present a parsimonious deep learning weather prediction model to forecast seven atmospheric variables with 3-hr time resolution for up to 1-year lead times on a 110-km global mesh using the Hierarchical Equal Area isoLatitude Pixelization (HEALPix). In comparison to state-of-the-art (SOTA) machine learning (ML) weather forecast models, such as Pangu-Weather and GraphCast, our DLWP-HPX model uses coarser resolution and far fewer prognostic variables. Yet, at 1-week lead times, its skill is only about 1 day behind both SOTA ML forecast models and the SOTA numerical weather prediction model from the European Center for Medium-Range Weather Forecasts. We report several improvements in model design, including switching from the cubed sphere to the HEALPix mesh, inverting the channel depth of the U-Net, and introducing gated recurrent units (GRU) on each level of the U-Net hierarchy. The consistent east-west orientation of all cells on the HEALPix mesh facilitates the development of location-invariant convolution kernels that successfully propagate weather patterns across the globe without requiring separate kernels for the polar and equatorial faces of the cube sphere. Without any loss of spectral power after the first 2 days, the model can be unrolled autoregressively for hundreds of steps into the future to generate realistic states of the atmosphere that respect seasonal trends, as showcased in 1-year simulations.

我们提出了一种简洁的深度学习天气预报模型,利用层次等面积等纬度像素化(HEALPix)技术,在 110 千米的全球网格上以 3 小时的时间分辨率预报七个大气变量,预报周期最长可达 1 年。与最先进的(SOTA)机器学习(ML)天气预报模式(如盘古天气和 GraphCast)相比,我们的 DLWP-HPX 模式使用更粗糙的分辨率和更少的预报变量。然而,在 1 周的准备时间内,其技能仅比 SOTA ML 预报模式和欧洲中期天气预报中心的 SOTA 数值天气预报模式落后 1 天左右。我们报告了模型设计方面的几项改进,包括从立方球形网格转换到 HEALPix 网格,反转 U-Net 的通道深度,以及在 U-Net 层次结构的每一级引入门控循环单元(GRU)。HEALPix 网格上所有单元的东西方向一致,这有利于开发位置不变的卷积核,从而成功地将天气模式传播到全球各地,而无需为立方体球体的极地和赤道面分别建立核。在头两天之后,该模型的频谱功率不会有任何损失,可以自回归方式向未来展开数百步,生成尊重季节趋势的真实大气状态,这在 1 年模拟中得到了展示。
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引用次数: 0
A Constrained Spectral Approximation of Subgrid-Scale Orography on Unstructured Grids 非结构化网格上子网格尺度摄星术的受限光谱近似方法
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-19 DOI: 10.1029/2024MS004361
Ray Chew, Stamen Dolaptchiev, Maja-Sophie Wedel, Ulrich Achatz

The representation of subgrid-scale orography is a challenge in the physical parameterization of orographic gravity-wave sources in weather forecasting. A significant hurdle is encoding as much physical information with as simple a representation as possible. Other issues include scale awareness, that is, the orographic representation has to change according to the grid cell size and usability on unstructured geodesic grids with non-quadrilateral grid cells. This work introduces a novel spectral analysis method approximating a scale-aware spectrum of subgrid-scale orography on unstructured geodesic grids. The dimension of the physical orographic data is reduced by more than two orders of magnitude in its spectral representation. Simultaneously, the power of the approximated spectrum is close to the physical value. The method is based on well-known least-squares spectral analyses. However, it is robust to the choice of the free parameters, and tuning the algorithm is generally unnecessary. Numerical experiments involving an idealized setup show that this novel spectral analysis performs significantly better than a straightforward least-squares spectral analysis in representing the physical energy of a spectrum. Studies involving real-world topographic data are conducted, and reasonable error scores within ±10% error relative to the maximum physical quantity of interest are achieved across different grid sizes and background wind speeds. The deterministic behavior of the method is investigated along with its principal capabilities and potential biases, and it is shown that the error scores can be iteratively improved if an optimization target is known. Discussions on the method's limitations and broader applicability conclude this work.

子网格尺度地貌的表示是天气预报中地貌重力波源物理参数化的一个挑战。一个重要的障碍是用尽可能简单的表示方法编码尽可能多的物理信息。其他问题包括尺度感知,即地形表示必须根据网格单元的大小而改变,以及在非四边形网格单元的非结构化大地网格上的可用性。这项工作介绍了一种新颖的频谱分析方法,该方法可近似非结构化大地网格上子网格尺度地貌的尺度感知频谱。在光谱表示中,物理地貌数据的维度减少了两个数量级以上。同时,近似频谱的功率接近物理值。该方法基于著名的最小二乘光谱分析。不过,该方法对自由参数的选择具有很强的鲁棒性,通常无需对算法进行调整。涉及理想化设置的数值实验表明,在表示光谱的物理能量方面,这种新型光谱分析方法的性能明显优于直接的最小二乘法光谱分析方法。研究涉及真实世界的地形数据,在不同的网格大小和背景风速下,相对于感兴趣的最大物理量的误差在±10%以内,达到了合理的误差分数。对该方法的确定性行为及其主要功能和潜在偏差进行了研究,结果表明,如果已知优化目标,误差分值可以迭代改进。最后还讨论了该方法的局限性和更广泛的适用性。
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引用次数: 0
Wave-Convection Interactions Amplify Convective Parameterization Biases in the South Pacific Convergence Zone 波浪与对流的相互作用放大了南太平洋辐合带的对流参数化偏差
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-16 DOI: 10.1029/2024MS004334
Yuanrui Chen, Wenchao Chu, Jonathon S. Wright, Yanluan Lin

Climate models have long-standing difficulties simulating the South Pacific Convergence Zone (SPCZ) and its variability. For example, the default Zhang-McFarlane (ZM) convection scheme in the Community Atmosphere Model version 5 (CAM5) produces too much light precipitation and too little heavy precipitation in the SPCZ, with this bias toward light precipitation even more pronounced in the SPCZ than in the tropics as a whole. Here, we show that implementing a recently developed convection scheme in the CAM5 yields significant improvements in the simulated SPCZ during austral summer and discuss the reasons behind these improvements. In addition to intensifying both mean rainfall and its variability in the SPCZ, the new scheme produces a larger heavy rainfall fraction that is more consistent with observations and state-of-the-art reanalyses. This shift toward heavier, more variable rainfall increases both the magnitude and altitude of diabatic heating associated with convective precipitation, intensifying lower tropospheric convergence and increasing the influence of convection on the upper-level circulation. Increased diabatic production of potential vorticity in the upper troposphere intensifies the distortion effect exerted by convection on transient Rossby waves that pass through the SPCZ. Weaker distortion effects in simulations using the ZM scheme allow waves to propagate continuously through the region rather than dissipating locally, further reducing updrafts and weakening convection in the SPCZ. Our results outline a dynamical framework for evaluating model representations of tropical–extratropical interactions within the SPCZ and clarify why convective parameterizations that produce “top-heavy” profiles of deep convective heating better represent the SPCZ and its variability.

气候模式在模拟南太平洋辐合带(SPCZ)及其变化方面长期存在困难。例如,共同体大气模式第 5 版(CAM5)中默认的张-麦克法兰(ZM)对流方案在南太平洋辐合带产生了过多的轻降水和过少的强降水,这种偏向轻降水的情况在南太平洋辐合带甚至比在整个热带地区更为明显。在这里,我们展示了在 CAM5 中实施最近开发的对流方案后,澳大利夏季的 SPCZ 模拟结果有了显著改善,并讨论了这些改善背后的原因。新方案除了增强了 SPCZ 的平均降雨量及其变化之外,还产生了更大的强降雨分量,这与观测结果和最新的再分析结果更加一致。这种向更强、更多变降雨的转变增加了与对流降水相关的二重加热的幅度和高度,加强了对流层低层的辐合,增加了对流对高层环流的影响。对流层上层潜在涡度的二重性增加,加剧了对流对穿过 SPCZ 的瞬态罗斯比波的扭曲效应。在使用 ZM 方案的模拟中,扭曲效应较弱,使得波在该区域持续传播,而不是在局部消散,从而进一步减少了上升气流,削弱了 SPCZ 的对流。我们的研究结果为评估 SPCZ 内热带-外热带相互作用的模式表述勾勒出了一个动力学框架,并阐明了为什么产生 "头重脚轻 "的深层对流加热剖面的对流参数化能更好地表述 SPCZ 及其变化。
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引用次数: 0
Impacts of Topography-Based Subgrid Scheme and Downscaling of Atmospheric Forcing on Modeling Land Surface Processes in the Conterminous US 基于地形的子网格方案和大气强迫降尺度对美国大陆陆地表面过程建模的影响
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-15 DOI: 10.1029/2023MS004064
Teklu K. Tesfa, L. Ruby Leung, Peter E. Thornton, Michael A. Brunke, Zhuoran Duan

The effects of small-scale topography-induced land surface heterogeneity are not well represented in current Earth System Models (ESMs). In this study, a new topography-based subgrid structure referred to as topographic units (TGU) designed to better capture subgrid topographic effects, and methods to downscale atmospheric forcing to the land TGUs have been implemented in the Energy Exascale Earth System Model (E3SM) Land Model (ELM). Effects of the subgrid scheme and downscaling methods on ELM simulated land surface processes are evaluated over the conterminous United States (CONUS). For this purpose, ELM simulations are performed using two configurations without (NoD ELM) and with (D ELM) downscaling, both using TGUs derived for the 0.5-degree grids and the same land surface parameters. Simulations using the two ELM configurations are compared over the CONUS domain, regional levels, and at observational sites (e.g., SNOTEL). The CONUS-level results suggest that D ELM simulates more snowfall and snow water equivalent (SWE), higher runoff, and less ET during spring and summer. Regional-level results suggest more pronounced impacts of downscaling over regions dominated by higher elevation TGUs and regions with maximum precipitation occurring during cool seasons. Results at the SNOTEL sites suggest that D ELM has superior capability of reproducing the observed SWE at 83% of the sites, with more pronounced performance over topographically heterogeneous TGUs with their maximum precipitation occurring during cool seasons. The results highlight the importance of improving representation of small-scale surface heterogeneity in ESMs and motivate future research to understand their effects on land-atmosphere interactions, streamflow, and water resources management over mountainous regions.

目前的地球系统模式(ESM)没有很好地体现小尺度地形引起的陆地表面异质性的影响。在这项研究中,能源超大规模地球系统模式(E3SM)陆地模式(ELM)采用了一种新的基于地形的子网格结构,称为地形单元(TGU),旨在更好地捕捉子网格地形效应,并采用了将大气强迫降级到陆地地形单元的方法。评估了子网格方案和降尺度方法对 ELM 模拟的美国陆地表面过程的影响。为此,使用不降级(NoD ELM)和降级(D ELM)两种配置进行了 ELM 模拟,两种配置都使用了 0.5 度网格和相同的地表参数得出的 TGU。使用两种 ELM 配置对 CONUS 域、区域级别和观测点(如 SNOTEL)进行了模拟比较。CONUS 层面的结果表明,D ELM 模拟的降雪量和雪水当量(SWE)更大,径流量更高,而春季和夏季的蒸散发更少。区域层面的结果表明,降尺度对海拔较高的 TGU 和冷季降水量最大的地区的影响更为明显。SNOTEL 站点的结果表明,D ELM 在 83% 的站点具有再现观测到的 SWE 的卓越能力,在地形异质性 TGU 上的表现更为明显,这些 TGU 的最大降水量出现在凉爽季节。这些结果突显了改善 ESM 对小尺度地表异质性表示的重要性,并激励未来的研究了解它们对山区陆地-大气相互作用、溪流和水资源管理的影响。
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引用次数: 0
An ML-Based P3-Like Multimodal Two-Moment Ice Microphysics in the ICON Model ICON 模型中基于 ML 的类似 P3 的多模态双瞬冰微物理学
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-12 DOI: 10.1029/2023MS004206
Axel Seifert, Christoph Siewert

Machine learning (ML) is used to build a bulk microphysical parameterization including ice processes. Simulations of the Lagrangian super-particle model McSnow are used as training data. The ML performs a coarse-graining of the particle-resolved microphysics to multi-category two-moment bulk equations. Besides mass and number, prognostic particle properties (P3) like melt water, rime mass, and rime volume are predicted by the ML-based bulk model. The ML-based scheme is tested with simulations of increasing complexity. As a box model, the ML-based bulk scheme can reproduce the simulations of McSnow quite accurately. In 3d idealized squall line simulations, the ML-based P3-like scheme provides a more realistic extended stratiform region when compared to the standard two-moment bulk scheme in ICON. In a realistic case study, the ML-based scheme runs stably, but can not significantly improve the results. This shows that ML can be used to coarse-grain super-particle simulations to a bulk scheme of arbitrary complexity.

机器学习(ML)用于建立包括冰过程在内的体微观物理参数化。拉格朗日超粒子模型 McSnow 的模拟结果被用作训练数据。ML 对粒子分辨微观物理进行粗粒化处理,并将其转换为多类两时刻体方程。除质量和数量外,基于 ML 的体积模型还能预测颗粒的预报属性 (P3),如熔融水、熔屑质量和熔屑体积。基于 ML 的方案通过复杂程度不断增加的模拟进行了测试。作为一个箱体模型,基于 ML 的体模型方案可以相当准确地再现 McSnow 的模拟结果。在 3d 理想化斜线模拟中,与 ICON 中的标准两时刻体型方案相比,基于 ML 的类 P3 方案提供了更真实的扩展层状区域。在实际案例研究中,基于 ML 的方案运行稳定,但不能显著改善结果。这表明 ML 可用来将超粒子模拟粗粒度化为任意复杂度的体方案。
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引用次数: 0
Calibrating Tropical Forest Coexistence in Ecosystem Demography Models Using Multi-Objective Optimization Through Population-Based Parallel Surrogate Search 通过基于种群的并行替代搜索进行多目标优化,校准生态系统人口统计模型中的热带森林共存问题
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-08 DOI: 10.1029/2023MS004195
Yanyan Cheng, Wenyu Wang, Matteo Detto, Rosie Fisher, Christine Shoemaker

Tropical forest diversity governs forest structures, compositions, and influences the ecosystem response to environmental changes. Better representation of forest diversity in ecosystem demography (ED) models within Earth system models is thus necessary to accurately capture and predict how tropical forests affect Earth system dynamics subject to climate changes. However, achieving forest coexistence in ED models is challenging due to their computational expense and limited understanding of the mechanisms governing forest functional diversity. This study applies the advanced Multi-Objective Population-based Parallel Local Surrogate-assisted search (MOPLS) optimization algorithm to simultaneously calibrate ecosystem fluxes and coexistence of two physiologically distinct tropical forest species in a size- and age-structured ED model with realistic representation of wood harvest. MOPLS exhibits satisfactory model performance, capturing hydrological and biogeochemical dynamics observed in Barro Colorado Island, Panama, and robustly achieving coexistence for the two representative forest species. This demonstrates its effectiveness in calibrating tropical forest coexistence. The optimal solution is applied to investigate the recovery trajectories of forest biomass after various intensities of clear-cut deforestation. We find that a 20% selective logging can take approximately 40 years for aboveground biomass to return to the initial level. This is due to the slow recovery rate of late successional trees, which only increases by 4% over the 40-year period. This study lays the foundation to calibrate coexistence in ED models. MOPLS can be an effective tool to help better represent tropical forest diversity in Earth system models and inform forest management practices.

热带森林多样性决定着森林结构和组成,并影响着生态系统对环境变化的反应。因此,有必要在地球系统模型中的生态系统人口统计(ED)模型中更好地体现森林多样性,以准确捕捉和预测热带森林如何影响受气候变化影响的地球系统动力学。然而,在 ED 模型中实现森林共存具有挑战性,因为其计算成本高昂,而且对森林功能多样性机制的了解有限。本研究采用先进的多目标基于种群的并行局部代理辅助搜索(MOPLS)优化算法,在大小和年龄结构的 ED 模型中同时校准生态系统通量和两种生理上不同的热带森林物种的共存,并真实地反映了木材采伐情况。MOPLS 的模型性能令人满意,它捕捉到了在巴拿马巴罗科罗拉多岛观测到的水文和生物地球化学动态,并稳健地实现了两种代表性森林物种的共存。这证明了它在校准热带森林共存方面的有效性。最优解被用于研究不同强度的森林砍伐后森林生物量的恢复轨迹。我们发现,20% 的选择性砍伐需要大约 40 年的时间才能使地上生物量恢复到初始水平。这是由于晚生树木的恢复速度较慢,在 40 年的时间里只增加了 4%。这项研究为校准 ED 模型中的共存奠定了基础。MOPLS 可以作为一种有效的工具,帮助在地球系统模型中更好地体现热带森林多样性,并为森林管理实践提供信息。
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引用次数: 0
On Energy-Aware Hybrid Models 能源意识混合模型
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-08 DOI: 10.1029/2024MS004306
Igor Shevchenko, Dan Crisan

This study proposes deterministic and stochastic energy-aware hybrid models that should enable simulations of idealized and primitive-equations Geophysical Fluid Dynamics (GFD) models at low resolutions without compromising on quality compared with high-resolution runs. Such hybrid models bridge the data-driven and physics-driven modeling paradigms by combining regional stability and classical GFD models at low resolution that cannot reproduce high-resolution reference flow features (large-scale flows and small-scale vortices) which are, however, resolved. Hybrid models use an energy-aware correction of advection velocity and extra forcing compensating for the drift of the low-resolution model away from the reference phase space. The main advantages of hybrid models are that they allow for physics-driven flow recombination within the reference energy band, reproduce resolved reference flow features, and produce more accurate ensemble forecasts than their classical GFD counterparts. Hybrid models offer appealing benefits and flexibility to the modeling and forecasting communities, as they are computationally cheap and can use both numerically-computed flows and observations from different sources. All these suggest that the hybrid approach has the potential to exploit low-resolution models for long-term weather forecasts and climate projections thus offering a new cost effective way of GFD modeling. The proposed hybrid approach has been tested on a three-layer quasi-geostrophic model for a beta-plane Gulf Stream flow configuration. The results show that the low-resolution hybrid model reproduces the reference flow features that are resolved on the coarse grid and also gives a more accurate ensemble forecast than the physics-driven model.

本研究提出了确定性和随机性能量感知混合模型,可以在低分辨率下模拟理想化和原始方程的地球物理流体动力学(GFD)模型,而不影响与高分辨率运行相比的质量。这种混合模型是数据驱动和物理驱动建模模式的桥梁,它结合了区域稳定性和低分辨率下的经典地球流体动力学模型,这些模型无法再现高分辨率下的参考流动特征(大尺度流动和小尺度涡旋),而这些特征是可以解析的。混合模式采用能量感知的平流速度修正和额外强迫,以补偿低分辨率模式偏离参考相空间的漂移。混合模式的主要优点是可以在参考能带内进行物理驱动的气流重组,再现解析的参考气流特征,并比经典的 GFD 模式产生更准确的集合预报。混合模式为建模和预报界提供了极具吸引力的优势和灵活性,因为它们的计算成本低廉,可以同时使用数值计算流量和不同来源的观测数据。所有这些都表明,混合方法具有利用低分辨率模型进行长期天气预报和气候预测的潜力,从而为全球流体动力学建模提供了一种具有成本效益的新方法。已在一个三层准地转模型上对所提出的混合方法进行了测试,该模型为β平面湾流配置。结果表明,低分辨率混合模式再现了在粗网格上解析的参考流特征,并且比物理驱动模式提供了更准确的集合预报。
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引用次数: 0
Data Assimilation in Chaotic Systems Using Deep Reinforcement Learning 利用深度强化学习实现混沌系统中的数据同化
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-08 DOI: 10.1029/2023MS004178
Mohamad Abed El Rahman Hammoud, Naila Raboudi, Edriss S. Titi, Omar Knio, Ibrahim Hoteit

Data assimilation (DA) plays a pivotal role in diverse applications, ranging from weather forecasting to trajectory planning for autonomous vehicles. A prime example is the widely used ensemble Kalman filter (EnKF), which relies on the Kalman filter's linear update equation to correct each of the ensemble forecast member's state with incoming observations. Recent advancements have witnessed the emergence of deep learning approaches in this domain, primarily within a supervised learning framework. However, the adaptability of such models to untrained scenarios remains a challenge. In this study, we introduce a new DA strategy that utilizes reinforcement learning (RL) to apply state corrections using full or partial observations of the state variables. Our investigation focuses on demonstrating this approach to the chaotic Lorenz 63 and 96 systems, where the agent's objective is to maximize the geometric series with terms that are proportional to the negative root-mean-squared error (RMSE) between the observations and corresponding forecast states. Consequently, the agent develops a correction strategy, enhancing model forecasts based on available observations. Our strategy employs a stochastic action policy, enabling a Monte Carlo-based DA framework that relies on randomly sampling the policy to generate an ensemble of assimilated realizations. Numerical results demonstrate that the developed RL algorithm performs favorably when compared to the EnKF. Additionally, we illustrate the agent's capability to assimilate non-Gaussian observations, addressing one of the limitations of the EnKF.

从天气预报到自动驾驶汽车的轨迹规划,数据同化(DA)在各种应用中发挥着举足轻重的作用。一个典型的例子是广泛使用的集合卡尔曼滤波器(EnKF),它依赖于卡尔曼滤波器的线性更新方程,用接收到的观测数据修正每个集合预测成员的状态。最近的进步见证了深度学习方法在这一领域的出现,主要是在监督学习框架内。然而,这些模型对未经训练的场景的适应性仍然是一个挑战。在本研究中,我们介绍了一种新的数据分析策略,它利用强化学习(RL),利用对状态变量的全部或部分观察结果进行状态修正。我们的研究重点是在混沌洛伦兹 63 和 96 系统中演示这种方法,其中代理的目标是最大化几何序列,其项与观测值和相应预测状态之间的负均值平方根误差(RMSE)成正比。因此,代理制定了一种修正策略,根据现有观测结果加强模型预测。我们的策略采用了随机行动策略,使基于蒙特卡罗的数据分析框架成为可能,该框架依赖于随机抽样策略来生成同化现实的集合。数值结果表明,与 EnKF 相比,所开发的 RL 算法性能更佳。此外,我们还说明了代理吸收非高斯观测数据的能力,从而解决了 EnKF 的局限性之一。
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引用次数: 0
A Machine Learning Bias Correction on Large-Scale Environment of High-Impact Weather Systems in E3SM Atmosphere Model E3SM 大气模型中大尺度高影响天气系统环境的机器学习偏差校正
IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2024-08-08 DOI: 10.1029/2023MS004138
Shixuan Zhang, Bryce Harrop, L. Ruby Leung, Alexis-Tzianni Charalampopoulos, Benedikt Barthel Sorensen, Wenwei Xu, Themistoklis Sapsis

Large-scale dynamical and thermodynamical processes are common environmental drivers of high-impact weather systems causing extreme weather events. However, such large-scale environmental conditions often display systematic biases in climate simulations, posing challenges to evaluating high-impact weather systems and extreme weather events. In this paper, a machine learning (ML) approach was employed to bias correct the large-scale wind, temperature, and humidity simulated by the atmospheric component of the Energy Exascale Earth System Model (E3SM) at ∼1° resolution. The usefulness of the ML approach for extreme weather analysis was demonstrated with a focus on three high-impact weather systems, including tropical cyclones (TCs), extratropical cyclones (ETCs), and atmospheric rivers (ARs). We show that the ML model can effectively reduce climate bias in large-scale wind, temperature, and humidity while preserving their responses to imposed climate change perturbations. The bias correction is found to directly improve water vapor transport associated with ARs, and representations of thermodynamical flows associated with ETCs. When the bias-corrected large-scale winds are used to drive a synthetic TC track forecast model over the Atlantic basin, the resulting TC track density agrees better with that of the TC track model driven by observed winds. In addition, the ML model insignificantly interferes with the mean climate change signals of large-scale storm environments as well as the occurrence and intensity of three weather systems. This study suggests that the proposed ML approach can be used to improve the downscaling of extreme weather events by providing more realistic large-scale storm environments simulated by low-resolution climate models.

大尺度动力学和热力学过程是造成极端天气事件的高影响天气系统的常见环境驱动因素。然而,这种大尺度环境条件在气候模拟中经常出现系统性偏差,给评估高影响天气系统和极端天气事件带来了挑战。本文采用机器学习(ML)方法对能源超大规模地球系统模式(ESM)大气部分模拟的大尺度风、温度和湿度进行了 1° 分辨率的偏差校正。通过重点研究热带气旋(TC)、外热带气旋(ETC)和大气河流(AR)等三种影响较大的天气系统,证明了 ML 方法在极端天气分析中的实用性。我们的研究表明,ML 模式可以有效减少大尺度风、温度和湿度的气候偏差,同时保持它们对外加气候变化扰动的响应。我们发现,偏差校正可直接改善与 ARs 相关的水汽输送,以及与 ETCs 相关的热动力流的表示。当偏差校正后的大尺度风被用来驱动大西洋盆地上空的合成热气旋路径预报模式时,所得到的热气旋路径密度与观测风驱动的热气旋路径模式的密度更为一致。此外,ML 模式对大尺度风暴环境的平均气候变化信号以及三个天气系统的发生和强度干扰不大。这项研究表明,所提出的 ML 方法可以通过提供低分辨率气候模式所模拟的更真实的大尺度风暴环境来改进极端天气事件的降尺度处理。
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Journal of Advances in Modeling Earth Systems
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