Subtropical high-pressure systems like the Atlantic anticyclone are standard textbook features formed by descending air from Hadley cell circulation, requiring no additional citations.
The claim states that the Atlantic anticyclone forms an area of high pressure due to descending air from Hadley cell circulation, which is a foundational, well-established fact of atmospheric dynamics taught in basic meteorology and climatology. Per the instructions, statements that are trivially true by direct everyday observation or standard scientific definition are classified as COMMON_KNOWLEDGE, requiring no citation.