Characteristics of Tropical Cloud Regimes and Their Associated Radiative Effects from CloudSat/CALIPSO Satellite Products

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Title:	Characteristics of Tropical Cloud Regimes and Their Associated Radiative Effects from CloudSat/CALIPSO Satellite Products
Authors:	彭楷庭;Peng, Kai-Ting
Contributors:	大氣科學學系
Keywords:	雲型;大氣雲輻射效應;Cloud Regime;Atmospheric Cloud Radiative Effects;CloudSat/CALIPSO
Date:	2025-08-26
Issue Date:	2025-10-17 11:06:27 (UTC+8)
Publisher:	國立中央大學
Abstract:	CloudSat與CALIPSO兩顆衛星結合雷達與光達的觀測，解析沿著地面軌跡的垂直雲層結構，並提供全球雲種分布以及反演微物理參數的珍貴資料。本研究將利用CloudSat與CALIPSO從2007至2010年的完整觀測來分析不同於傳統遙測方法所得到的雲種分布以及其引發的輻射效應。我們使用CloudSat與CALIPSO的雲種分類產品估計熱帶地區各雲種的三維相對發生頻率，對於雲的通量傳輸分布進行視覺化並且討論控制雲種產生的大尺度特徵。而相對頻率的結果顯示對流雲系與捲出雲系的空間分布主要位於間熱帶輻合區內；而淺雲則約束於氣候平均沉降區域，例如副熱帶海洋以及大洋東側。再者，我們也對於相對頻率的日夜及季節變化進一步分析。結果顯示捲雲與層積雲於夜間具有較高的出現率，而積雲的日夜變化具有顯著的海陸差異，符合過去研究的觀測紀錄。另外，大多數雲種配合著間熱帶輻合區的季節性移動，僅有層積雲於副熱帶海洋顯示相反的季節特徵，並與東太平洋與東大西洋的高出現率形成緯向不對稱的特徵。利用CloudSat與CALIPSO的輻射通量與加熱率產品，我們計算大氣雲輻射效應並討論各雲種對地球輻射能量收支及環流改變造成的影響。此外，我們也藉由奇異值分解方法計算相對頻率與大氣雲輻射效應在季節與年際震盪時間尺度的耦合模態。其結果顯示對流雲系於間熱帶輻合區內引發強烈的輻射加熱；而淺雲主要在副熱帶海洋引起輻射冷卻，此強烈加熱率梯度於季節尺度加強了大氣環流的強度與極向的熱通量傳送。最後，我們利用CERES完整的輻射通量觀測分析高雲在年際震盪尺度的雲輻射效應，並且對於高雲正回饋的機制進行討論。 ;By leveraging the comprehensive observations from CloudSat and CALIPSO, which profile the atmospheric column along their ground-track cross-sections and provide detailed vertical cloud structure, this study evaluates the characteristics of various cloud types and their associated radiative impacts extending beyond the capabilities of traditional observation methods. To fully illustrate the transport pathway and investigate the large-scale features governing cloud distribution, the three-dimensional relative frequencies of various cloud types are visualized using the cloud classification product. Convective and detrained cloud types generally align with the Intertropical Convergence Zones (ITCZs), while shallow clouds are constrained within climatological subsidence regions. Additionally, the diurnal cycle and seasonal variations in cloud occurrence are examined. Stratocumulus and cirrus clouds exhibit a strong nighttime prevalence, whereas cumulus clouds display a clear land-sea contrast in their diurnal patterns. In terms of seasonality, most cloud types follow the migration of the ITCZs, while stratocumulus clouds show an opposite variation and a zonally asymmetric distribution across the subtropical oceans. By utilizing the fluxes and heating rate dataset, the average atmospheric cloud radiative effects (ACRE) is calculated to assess the influence of cloud regimes on the energy budget and atmospheric circulation. Furthermore, the coupled relation between relative frequency and ACRE anomalies on seasonal and interannual time scales is analyzed using the singular value decomposition (SVD) method. Results indicate that convective clouds induce substantial warming in the ITCZs, while shallow clouds generate cooling over the subtropical oceans, together enhancing the general circulation on seasonal time scales. Finally, supplementary analyses using CERES observations are incorporated to extend variability of SVD mode to longer time periods.
Appears in Collections:	[Department of Atmospheric Sciences and Graduate Institute of Atmospheric Physics ] Department of Earth Sciences

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