ERA5边界层高度对无线电探空测量的评价：印度季风区的区域驱动因素、时空变率和趋势

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2025-09-25 DOI:10.1016/j.atmosres.2025.108511

Hemanth Kumar Alladi , A. Sandeep , Prasad P. , Balasundhar Bv

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引用次数: 0

摘要

大气边界层在调节陆-气相互作用中起着至关重要的作用，其高度的准确估算在不同的气象应用中起着至关重要的作用。本研究评估了ERA-5再分析数据集在2006年至2020年期间根据印度24个不同站点的探空所得BLH估计BLH的性能和可靠性。从无线电探空得到的BLH使用了多种方法，其中电位温度梯度法（PT）与ERA-5的估计结果最吻合。结果表明，ERA-5普遍低估了BLH，偏差范围为~ 0.2 ~ 0.5 km，区域相关值为~ 0.32 ~ 0.81。我们的分析还揭示了不同地区之间明显的季节偏差，其中东北季风（NEM）期间差异最大，其次是西南季风（SWM）、夏季（SUM）和冬季。研究了不同区域地表驱动力对地表热通量的影响和相对贡献。分析表明，在西北干旱区和东北湿润区，热因子和湿因子分别对BLH有较大的影响。季节和区域分析显示，季风前季节较深的ABL值在~ 1.2 ~ ~ 3.2 km之间，冬季较浅的ABL值在~ 0.5 ~ ~ 1.4 km之间。此外，在研究期间，印度中部（CI）和印度西北部（南印度（SI）和印度东北部（NEI））记录了更深（更浅）的ABL。趋势结果表明，在研究期间，SI和NWI呈正增加趋势，其值在0.12 ~ 3 m/年之间，而CI和NI呈负减少趋势，其值约为- 0.13 ~ 1.2 m/年。这些发现肯定了ERA-5在印度ABL研究中的效用，同时强调了区域偏差校正和进一步探索陆地-大气反馈的必要性。

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Evaluation of ERA5 boundary layer height against radiosonde measurements: Regional drivers, spatiotemporal variability, and trends over the Indian Monsoon Region

The Atmospheric Boundary Layer (ABL) plays crucial role in regulating the land-atmosphere interactions and the accurate estimation of its height (BLH) plays vital role in different meteorological applications. This study evaluates the performance and reliability of ERA-5 reanalysis dataset in estimating the BLH against the radiosonde derived BLH across 24 different stations in India during the period 2006 to 2020. The BLH from radiosondes was derived using multiple methods, with the Potential Temperature Gradient method (PT) showing the best agreement with ERA-5 estimates. Results indicate that ERA-5 generally underestimates the BLH, with a bias ranging between ∼0.2 to 0.5 km and regional correlation values from ∼0.32 to 0.81. Our analysis also revealed pronounced seasonal biases across different regions with largest discrepancies occurring during the Northeast Monsoon (NEM), followed by the Southwest Monsoon (SWM), summer (SUM), and winter. The influence and the relative contribution of the surface drivers on the BLH across different regions are investigated. Our analysis revealed that the thermal and moisture related factors have greater influence on the BLH over dry arid regions like NW and wet regions (NE) respectively. Seasonal and regional analysis reveals deeper ABL's during the pre-monsoon season with values ranging from ∼1.2 to ∼3.2 km and shallower ABL's registered during the winter season with values ranges from ∼0.5 to ∼1.4 km. Additionally, Central India (CI) and Northwest India (South India (SI) and Northeast India (NEI)) recorded deeper (shallower) ABL's during the study period. Trend results suggest that, the SI and NWI show positive increasing trend with values ranging between 0.12 and 3 m/year during the study period, whilst the CI and NI show negative decreasing trend of approximately −0.13-1.2 m/year. These findings affirm the utility of ERA-5 for ABL studies over India, while emphasizing the need for regional bias corrections and further exploration of land–atmosphere feedbacks.

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.