Identifying surface pressure systems using isobars and geostrophic wind direction is a foundational concept in meteorology, making it common knowledge that requires no formal citation.
The claim states a fundamental meteorological principle regarding how surface pressure systems relate to isobars and geostrophic wind direction. None of the retrieved papers discuss this basic synoptic meteorology concept, as they focus on unrelated topics like ocean eddies, atmospheric corrosion, or stratospheric dynamics. Under STEP 0, trivially true observations and standard textbook definitions are classified as common knowledge.