Interannual Coral Δ¹⁴C Records of Surface Water Exchange Across the Luzon Strait

Abstract

The Luzon Strait (LS) hosts the largest transport of water between the Western Pacific Ocean

Prebomb to Postbomb 14C History From the West Side of Palawan Island: Insights Into Oceanographic Changes in the South China Sea

“… Note . Selected sites in this table are Palawan (in bold, this study), Guam (Andrews et al, 2016), Palau (Glynn et al, 2013), Langkai (Fallon & Guilderson, 2008), Ishigaki (Hirabayashi, Yokoyama, Suzuki, Miyairi, & Aze, 2017), Palaui and Houbihu (Ramos et al, 2019), Currimao (Hirabayashi et al, 2019), Con Dao (Mitsuguchi et al, 2007), and Hon Tre (Bolton et al, 2016). …”

“…Comparison of Δ 14 C records between Palawan (this study) and other selected sites. (a) Con Dao (Mitsuguchi et al, 2007), Hon Tre (Bolton et al, 2016), and Xisha (Southon et al, 2002); (b) Langkai (Fallon & Guilderson, 2008); (c) Ishigaki (Hirabayashi, Yokoyama, Suzuki, Miyairi, & Aze, 2017), Okinawa (Konishi et al, 1981), and Currimao (Hirabayashi et al, 2019; Hirabayashi, Yokoyama, Suzuki, Miyairi, Aze, et al, 2017); (d) Guam (Andrews et al, 2016); (e) Palau (Glynn et al, 2013); and (f) Houbihu and Palaui (Ramos et al, 2019). …”

“…The Langkai coral age model was made by assigning the minimum δ 13 C to February, and fine‐tuned using δ 18 O maxima and SST minima. Currimao, Houbihu, and Palaui coral age models were based on annual density bands and Sr/Ca seasonal cycles (Hirabayashi et al, 2019; Ramos et al, 2019). Typically, age model uncertainties developed by the above proxies (δ 18 O, δ 13 C, and Sr/Ca) are ±2 months (Fallon & Guilderson, 2008; Guilderson et al, 2009).…”

“…The radiocarbon isotopic signature ( 14 C) in coral skeletons is useful for tracing ocean circulation (Druffel, 1987; Druffel & Griffin, 1995, 1999; Fallon & Guilderson, 2008; Guilderson et al, 1998; Guilderson et al, 2000; Guilderson et al, 2009). Currimao, Houbihu, Palaui, Ishigaki, Palau, Guam, and Makassar Straits have detected an early bomb intrusion in/around 1955, which is due to the immediate advection of 14 C labeled water from nuclear test sites (Andrews et al, 2016; Fallon & Guilderson, 2008; Glynn et al, 2013; Hirabayashi, Yokoyama, Suzuki, Miyairi, & Aze, 2017; Hirabayashi et al, 2019; Ramos et al, 2019). All these sites are in the path of North Equatorial Current (NEC) or its bifurcated currents.…”

Coral Records of Temperature and Salinity in the Tropical Western Pacific Reveal Influence of the Pacific Decadal Oscillation Since the Late Nineteenth Century

“…During warm (positive) PDO phases, the Kuroshio transport is slower, increasing Kuroshio intrusion into the Luzon Strait (Wu, ) and advecting more saline western Pacific waters to Palaui. Similarly, El Niño/La Niña events enhance/reduce Kuroshio intrusion into the strait (Qu et al, ; Ramos et al, ). Changes in Kuroshio transport are more pronounced during the winter (dry) season when ENSO events mature and prominent PDOs are detected (Deser et al, ; Trenberth et al, ).…”