Last deglaciation in the Okinawa Trough: Subtropical northwest Pacific link to Northern Hemisphere and tropical climate

Abstract

[1] Detailed deglacial and Holocene records of planktonic d 18 O and Mg/Ca-based sea surface temperature (SST) from the Okinawa Trough suggest that at $18 to 17 thousand years before present (kyr B.P.), late spring/ early summer SSTs were approximately 3°C cooler than today, while surface waters were up to 1 practical salinity unit saltier. These conditions are consistent with a weaker influence of the summer East Asian Monsoon (EAM) than today. The timing of suborbital SST oscillations suggests a close link with abrupt changes in the EAM and North Atlantic climate. A tropical influence, however, may have resulted in subtle decoupling between the North Atlantic and the Okinawa Trough/EAM during the deglaciation. Okinawa Trough surface water trends in the Holocene are consistent with model simulations of an inland shift of intense EAM precipitation during the middle Holocene. Millennial-scale alternations between relatively warm, salty conditions and relatively cold, fresh conditions suggest varying influence of the Kuroshio during the Holocene.

Lagged response of summer precipitation to insolation forcing on the northeastern Tibetan Plateau during the Holocene

“…Finally, we also used a Mg/Ca-based SST proxy record from core A7 (Sun et al 2005) in the northwestern Pacific to analyse the possible physical mechanism underlying the variations in precipitation on the northeastern Tibetan Plateau during the Holocene. Two proxy records from Tianchi Lake and Gonghai Lake on the Chinese Loess Plateau were also used to compare with our simulation results.…”

“…Other forcing factors apart from insolation forcing-for example, greenhouse gas concentrations, continental ice sheets and meltwater fluxes-were taken at pre-industrial (AD 1850) levels. In this regard, this approach is effectively a sensitivity test of Sun et al (2005) climate models to variations in insolation. More details on the model can be found in Jin et al (2014).…”

“…18 O values documented in planktonic foraminifera shells show no significant changes in the North Pacific Ocean throughout the Holocene (Ohkushi et al 2003;Sun et al 2005;Kubota et al 2010). The weakened WPSH, which reduces the transport of water vapour from the high-latitude North Pacific, has probably been an important reason for the enrichment of 18 O in Qinghai Lake during the Holocene.…”

Water and carbon stable isotope records from natural archives: a new database and interactive online platform for data browsing, visualizing and downloading

“…In order to illustrate the chronological quality flag, we describe hereafter five examples: a. Quality flag 1 (excellent): Marine Core A7 (27.82 • N, 126.98 • E investigated by Sun et al, 2005) is constrained by 15 well-distributed AMS 14 C dates ranging from 1 to 17.5 ka, corresponding to the time period where oxygen stable isotope data are available. There is therefore no significant arbitrarily dated interval.…”

Centennial- to Millennial-scale Climate Change Since the Last Glacial: the review of related studies from the North Atlantic, East Asia, and Korea

“…또한 중국 동북부와 일본의 호수 퇴적물 분석 (Nakagawa et al, 2003;Stebich et al, 2009;Hayashi et al, 2010;Takahara et al, 2010) 과 동중국해, 북중국해, 그리고 동해 등지에서 시 추된 해양퇴적물 분석 결과들 (Ijiri et al, 2005;Li et al, 2001;Sun et al, 2005;Harada et al, 2008;Kubota et al, 2010) (Lee et al, 2011) (b). Note the changes in selected taxa at ca.…”