Intan Suci Nurhati, Ph.D. 
 
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 A Network of High-resolution Indonesian Paleoclimate Studies

via Corals and Trees

 

 

 

 

 

Coral-based SST and Salinity Records

 

We are generating a network of coral d18O and Sr/Ca records from Indonesia to study past climate and oceanography in the region, such as the  Indonesian Throughflow (ITF). ITF regulates oceanic mass and heat transport from the West Pacific Warm Pool into the Indian Ocean, thus playing an important role in shaping Indo-Pacific climate variability. Corals from western Indonesia for Indonesia for instances (as one of the study sites) contain information on seawater density variations in the region that may influence the strength of the ITF. The less dense seawater that develops in this region during the SW monsoon are advected to the main pathway of the ITF at the Makassar Strait during the NE monsoon, thereby reducing the flow of the ITF on a seasonal timescale. There are no available long instrumental data to understand the history of these oceanic throughflows over the recent century and its role on the regional climate. As such, corals would be valuable for studying high-resolution past climate and oceanography in the Indonesian maritime region.

 

In collaboration with:

Sri Yudawati Cahyarini (Indonesian Institute of Sciences)
Agus Setiawan & Camellia Tito (Ministry of Marine Affairs and Fisheries)
Christian Dullo (GEOMAR)

 

 

 


 

Indonesian Tree Isotope Records

 

Our Indonesian tree isotope project aims to (i) understand ENSO-sensitive rainfall variability in the maritime continent over the past centuries and (ii) advance dendroclimatology contributions from the tropics. Tropical dendroclimatology has been hindered by the lack of distinct annual rings in tropical trees; this motivated me to apply isotope geochemical tools (i.e. d18O of tree a-cellulose) to Indonesian trees to infer past rainfall variations. Modeling work on tropical tree d18O hints that a network of records from selected sites in Indonesia may resolve rainfall variations associated with ENSO. In collaboration with University of Maryland and Columbia University’s Tree Ring Lab, I have conducted a proof-of-concept study on the utility of this novel rainfall proxy on trees from SE Sulawesi, Indonesia. With the support of the USAID-NSF PEER Science program, we are generating replicated multi-centuries-long tree isotope records from Indonesia.

 

In collaboration with:

Mike Evans (Univ. of Maryland)
Rosanne D'Arrigo (LDEO)
Sri Yudawati Cahyarini (Indonesian Institute of Sciences)
Erwin & Harmonis (Universitas Mulawarman)

 

Funded by: