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<p>Occult precipitation (OP) is considered as the sum of water collected by fog when no rainfall occurs. As well as fog associated with drizzle when it occurs simultaneously but is not recorded by a conventional rain gauge. The objective of this article is to analyze synoptic conditions influencing occult precipitation occurrences in Aparados da Serra National Park, Rio Grande do Sul, Brazil, from 2017 to 2018. Hourly and daily OP data were collected using a fog collector installed at an altitude of 923&#xa0;m. Meteorological data were obtained from two official weather stations. Synoptic surface charts and satellite images were used to identify atmospheric systems on OP days. Results showed that 35% of days experienced polar system influence, 26% tropical system influence, and 23% mixed polar influence. Additionally, 16% of OP days involved two distinct atmospheric systems. Thus, OP was observed under various synoptic conditions. The polar systems predominantly contributing to OP across all intensities and most months of the year.</p>

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Atmospheric patterns associated with fog water collection in Aparados da Serra National Park, Southern Brazil

  • 期刊论文

  • 发表日期：

    2025年1月30日

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  • Jakeline Baratto,
  • Paulo Miguel de Bodas Terassi,
  • Emerson Galvani,
  • Cássio Arthur Wollmann,
  • Bruno Serafini Sobral

摘要

Occult precipitation (OP) is considered as the sum of water collected by fog when no rainfall occurs. As well as fog associated with drizzle when it occurs simultaneously but is not recorded by a conventional rain gauge. The objective of this article is to analyze synoptic conditions influencing occult precipitation occurrences in Aparados da Serra National Park, Rio Grande do Sul, Brazil, from 2017 to 2018. Hourly and daily OP data were collected using a fog collector installed at an altitude of 923 m. Meteorological data were obtained from two official weather stations. Synoptic surface charts and satellite images were used to identify atmospheric systems on OP days. Results showed that 35% of days experienced polar system influence, 26% tropical system influence, and 23% mixed polar influence. Additionally, 16% of OP days involved two distinct atmospheric systems. Thus, OP was observed under various synoptic conditions. The polar systems predominantly contributing to OP across all intensities and most months of the year.