Centennial to millennial climate variability in the far northwestern Pacific (off Kamchatka) and its linkage to the East Asian monsoon and North Atlantic from the Last Glacial Maximum to the early Holocene

Abstract

Abstract. High-resolution reconstructions based on productivity proxies and magnetic properties of core LV63-41-2 (off Kamchatka) reveal prevailing centennial productivity/climate variability in the northwestern (NW) Pacific from the Last Glacial Maximum (LGM) to the early Holocene (EH). The age model of the core is established by AMS 14 C dating and by projections of AMS 14 C data of the nearby core SO-201-12KL through correlation of the productivity proxies and relative paleomagnetic intensity. The resulting sequence of centennial productivity increases/climate warming events in the NW Pacific occurred synchronously with the East Asian summer monsoon (EASM) sub-interstadials during the LGM (four events), Heinrich Event 1 (HE1) (four events), Bølling-Allerød (B/A) warming (four events), and over the EH (four events). Remarkable similarity of the sequence of the NW Pacific increased-productivity events with the EASM sub-interstadials over the LGM-HE1 implies that the Siberian High is a strong and common driver. The comparison with the δ 18 O record from Antarctica suggests that another mechanism associated with the temperature gradient in the Southern Hemisphere may also be responsible for the EASM/NW Pacific centennial events over the LGM-HE1. During the B/A warming and resumption of the Atlantic Meridional Overturning Circulation (AMOC), clear synchronicity between the NW Pacific, EASM and Greenland sub-interstadials was mainly controlled by changes in the atmospheric circulation. During the EH the linkages between solar forcing, ocean circulation, and climate changes likely control the synchronicity of abrupt climate changes in the NW Pacific and North Atlantic. The sequence of centennial events recorded in this study is a persistent regional feature during the LGM-EH, which may serve as a template in high-resolution paleoceanography and sediment stratigraphy in the NW Pacific.

An Integrated View of Organic Biomarker‐Based Sea Surface Temperature Changes in the Subarctic Pacific Since the Last Ice Age

“…According to our SST compilation (Figure 3), most SST records in the subarctic Pacific show abrupt warming into the BA and cooling into the YD. In detail, the BA warming was consistent with elevated primary productivity and reduced spring sea-ice coverage in the Northwestern Pacific (Caissie et al, 2010;Gorbarenko et al, 2017;Max et al, 2012;Méheust et al, 2016Méheust et al, , 2018 and Northeastern Pacific (Davies et al, 2011;Méheust et al, 2018). During the YD, the rapid cooling in the Northwestern Pacific and its marginal seas was closely coupled to extended spring sea-ice coverage (Max et al, 2012;Méheust et al, 2016Méheust et al, , 2018.…”

“…We will explore the possible mechanisms responsible for these contrasting phase relationships in Section 4.2. Despite inconsistent patterns in the subarctic Pacific, the SST remained at relatively low values during HS1 on both sides of the subarctic Pacific (Figure 3), corresponding to the southward expansion of the spring sea‐ice coverage and low marine productivity (Davies et al., 2011; Gorbarenko et al., 2017; Max et al., 2012; Méheust et al., 2018).…”

“…Core LV63‐41‐2 (52°34′N, 160°01′E; water depth = 1,924 m; length = 467 cm) was collected from the Northwestern Pacific off the Kamchatka Peninsula during the joint Chinese‐Russian Expedition on R/V Akademik M. A. Lavrentyev in 2013. The age model of core LV63‐41‐2 is well established based on AMS 14 C dating on foraminiferal shells and age tie points obtained by tuning to a nearby core SO201‐2‐12KL and the Chinese stalagmite δ 18 O records (Gorbarenko et al., 2017; Yu et al., 2020). We have re‐calibrated the AMS 14 C data into calendar ages using Calib 8.20 with the latest Marine20 calibration curve (Table S1 in Supporting Information ) and revised the chronology of core LV63‐41‐2.…”

Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka

“…The third and last hypothesis is that a change(s) among the terrigenous deposits explain the lower SD ferromagnetic grains input into the central Okhotsk Sea. Previous studies reported contemporaneous (i.e., <500 ka) environmental changes during interglacial intervals such as decreasing of IRD (e.g., Nürnberg and Tiedemann, 2004;Gorbarenko et al, 2017) and the increasing of sea level (e.g., Thomas et al, 2009). The latter strongly modified the input of terrigenous sediments in the center of Okhotsk Sea (e.g., Liu et al, 2006;Nürnberg et al, 2011;Jimenez-Espejo et al, 2018).…”

Multidecadal Monsoon Variations during the Early Last Deglaciation Revealed by Speleothem Record from Southwestern China

“…All these background conditions differ significantly from present background conditions. Previous studies suggest that, during the last deglaciation, a tight coupling between the Asian summer monsoon and the North Atlantic temperature changes exists at centennial to millennial timescales [13,[16][17][18]. However, the characteristics of multidecadal-scale oscillations of the vegetation and climate in the Asian monsoon region, and their linkages with the North Atlantic climates remain controversial.…”