| Autor: |
Wataru Hasegawa, Yumiko Watanabe, Hiroshige Matsuoka, Shinji Ohsawa, Brahmantyo, Budi, Maryunani, Khoiril Anwar, Takahiro Tagami |
| Předmět: |
|
| Zdroj: |
Journal of Cave & Karst Studies; Mar2018, Vol. 80 Issue 1, p19-27, 9p |
| Abstrakt: |
To elucidate environmental parameters controlling stalagmite growth in tropical areas, we conducted cave monitoring throughout a year in Petruk Cave, central Java, Indonesia. We compared stalagmite growth rate with the cave's environmental parameters, air temperature, drip rate, calcium concentration of the drip waters, and pCO2-air. We found a relationship where stalagmite growth rate is fast (slow) when pCO2-air is low (high) during dry (rainy) season, suggesting that pCO2-air controls stalagmite growth. Note that this is a first study that reports that dramatic pCO2-air reduction occurring during dry season in a tropical cave controls stalagmite growth. Additionally, we discuss the mechanism of pCO2-air fluctuation. Monitoring results show that pCO2-air fluctuation is divided into two phenomena: seasonal fluctuations and daily fluctuations. Dramatic pCO2-air reduction during the dry season is likely to result from a decline of plant activity due to little rainfall. On the daily scale, pCO2-air reached to the minimum around 6 a.m. and maximum around 2-4 p.m., although it is not obvious whether this is due to plant activity or cave ventilation. Also, dynamic pCO2- air reduction was observed following cave ventilation driven by the sudden drop of outside air temperature due to a downburst during severe rain. This suggests that heavy rainfall in short duration is also one factor that controls cave ventilation and pCO2-air. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
