C01_P11

Mid- to Late- Holocene sea level changes recorded in corals from Philippines

Yokoyama Y¹, Maeda Y², Siringan F³, Miyairi Y¹, Aze T¹, Sawada C¹

¹The University Of Tokyo, Kashiwa, Japan, ²University of Hyogo, Kobe, Japan, ³University of Philippines, Quezon City, Philippines

Sea level observations in the fields (relative sea level: RSL) can provide information on both climate and solid earth properties. Sites located far-away from former ice sheets (ie. far-fields) are useful to reconstruct polar ice sheets melting histories because they are relatively less sensitive to solid Earth properties (Yokoyama & Purcell, 2021). Since Antarctic ice sheets deglacial pathways are still not well understood, mid- to late- Holocene far-filed sea levels can constraint the ice sheets behavior in the past with respect to global climate changes (eg., Yokoyama et al., 2019). The Philippines is in a far-filed site, and coral reefs, which is a reliable RSL indicator (Yokoyama & Esat, 2015), can be found in widespread areas of the country’s coastline. We retrieved fossil micro atoll corals in different part of the Philippines and have conducted series of radiocarbon dating. In this presentation, we will discuss melting histories of Holocene Antarctic ice sheets and vertical tectonic movements of the Philippines coastline obtained from fossil coral data.

References:

Yokoyama, Y. and Purcell, A. (2021) On the geophysical processes impacting palaeo-sea-level observations. Geoscience Letters 8:13.

Yokoyama, Y., et al. (2019) Holocene Indian Ocean sea level, Antarctic melting history and past tsunami deposits inferred using sea level reconstructions from the Sri Lankan, Southeastern Indian and Maldivian coasts. Quaternary Science Reviews 206:150–161

Yokoyama, Y., Esat, T.M. (2015) Coral Reefs. In: Long A, Horton B, Shennan I (eds) Handbook of sea-level research. Wiley, Chichester, pp 104–124