本研究探討會計師情緒是否反映於關鍵查核事項語氣。以2019年至2024年美國上市公司為樣本，本文以簽證事務所所在地之雲層覆蓋量作為負向情緒代理變數，並以Loughran and McDonald財金字典衡量關鍵查核事項風險描述段落之負面語氣。主實證結果顯示，簽證事務所所在地之平均雲量與關鍵查核事項負面語氣有微弱證據指出呈正相關，初步支持會計師負向價性情緒可能反映於查核報告之風險文字表達。穩健性測試指出，當天氣觀測距離、查核報告日時間窗口或關鍵查核事項語氣衡量範圍改變時，未能觀察到一致之顯著關聯；橫斷面分析則顯示，該正向關聯在四大事務所及高訴訟風險產業樣本中較為明顯。整體而言，本研究提供探索性證據，補充會計師心理狀態與關鍵查核事項語氣形成因素之相關文獻。

This study examines whether auditor sentiment is reflected in the tone of key audit matters (KAMs). Using U.S. listed firms from 2019 to 2024, this study obtains KAM text from independent auditor's reports included in Form 10-K annual reports and uses cloud cover around the signing audit office as an exogenous proxy for auditors' negative affective state. The negative tone of KAM risk-description paragraphs is measured using the Loughran and McDonald financial dictionary. The main findings provide weak evidence of a positive association between local cloud cover and KAM negative tone, suggesting that auditors' negative affective state may be reflected in risk-related audit report wording. Sensitivity tests indicate that this association is not consistently observed when the weather radius, event window, or textual scope of KAM tone is modified. Cross-sectional analyses further show that the positive association is more evident among Big 4 audit offices and clients in high-litigation-risk industries. Overall, this study provides exploratory evidence that auditors' dynamic psychological state may be one factor associated with the formation of KAM tone.

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