Intensified episodes of East Asian Winter Monsoon during the middle through late Holocene driven by North Atlantic cooling events: High-resolution lignin records from the South Yellow Sea, China

Hao, Ting; Liu, Xiaojie; Ogg, James G.; Liang, Zhen Guang; Xiang, Rong; Zhang, Xiaodong; Zhang, Dahai; Zhang, Cai; Liu, Qiaoling; Li, Xianguo

doi:10.1016/j.epsl.2017.09.031

Cited by 32 publications

(34 citation statements)

References 50 publications

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“…Therefore, the YSWC was strengthened as a branch of the KC, in agreement with records in the ECS and Yellow Sea (Li et al, 2009). Consequently, the cold eddy was strengthened in the ECS during the past 1 ka (Yuan et al, 2018), in agreement with modern observation that the ECS cold eddy was strengthened when the YSWC was strong (Chen et al, 2004;Hao et al, 2017), which could drive the upwelling nutrient to favor phytoplankton productivity and cool the SST (Figs. 4 and 6D).…”

Section: High Phytoplankton Productivity and Community Structure Chansupporting

confidence: 85%

Air-sea interactive forcing on phytoplankton productivity and community structure changes in the East China Sea during the Holocene

Wang

Xiao

Yuan

et al. 2019

Global and Planetary Change

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Phytoplankton productivity and community structure in the East China Sea (ECS) play an important role in marine ecology and carbon cycle, but both have been changing rapidly in response to recent oceanic and atmospheric circulation changes. However, the lack of long-term records of phytoplankton productivity and community structure variability in the region hinders our understanding of natural forcing mechanisms. Here, we use the phytoplankton biomarker (brassicasterol, dinosterol and alkenones) contents as well as the ratios between these biomarkers in three sediment cores from the ECS shelf to reconstruct the spatiotemporal variations of productivity and community of diatoms, dinoflagellates and coccolithophores during the Holocene, respectively. During 9-7 ka, the ECS shelf was characterized by low phytoplankton productivity with low coccolithophore contribution, caused by the oligotrophic condition mainly owing to the restricted Kuroshio Current (KC) intrusion under low sea-level conditions, thus the lack of nutrient input. Phytoplankton productivity generally increased during 7-4.6 ka, in response to the initial intrusion of the Yellow Sea Warm Current (YSWC, a branch of the KC), bringing nutrient from the subsurface KC to the upper layer of the ECS for phytoplankton growth. Phytoplankton productivity continuously increased during 4.6-1 ka, due to an enhanced circulation system (YSWC and Yellow Sea Coastal Current (YSCC)) driven by strong East Asia Winter Monsoon (EAWM). Significantly, high alkenone contents and coccolithophore contribution in the eastern core F11A was associated with its location closer to the warm and saline YSWC, which was suitable for coccolithophore growth. Beyond diagenetic processes which could partly account for higher biomarker contents near core tops, elevated phytoplankton productivity during the last 1 ka might be induced by more nutrient supply from the intensified circulation system driven by enhanced KC and anthropogenic activities. The latter also resulted in high dinoflagellate proportions in all three cores. These temporal and spatial changes of phytoplankton productivity and community structure in the ECS during the Holocene corresponded to different mechanisms by the air-sea interaction, providing insights into distinguishing natural forcing and anthropogenic influences on marine ecology.

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Section: High Phytoplankton Productivity and Community Structure Chansupporting

confidence: 85%

Air-sea interactive forcing on phytoplankton productivity and community structure changes in the East China Sea during the Holocene

Wang

Xiao

Yuan

et al. 2019

Global and Planetary Change

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“…During the El Niño phase, anomalously negative geopotential height centered over the northeastern part of East Asia and the surrounding sea, including Northeast China, the Korean Peninsula, the northern region of the East Asian marginal sea, and part of the Japan Sea (East Sea). Meanwhile, in January and North American ice volume; (b) EAWM proxies in northern East Asian marginal sea including clay mineral ratio, grain size index in the middle Okinawa Trough (Zheng et al, 2014), and lignin record (Hao et al, 2017) in the central Yellow Sea; (c) simulated EAWM speed in northern East Asian marginal sea with KCM; (d) EAWM proxies in South China Sea including SST gradient between west and east (Huang et al, 2011) and between surface and thermocline waters ; (e) simulated EAWM speed in South China Sea with KCM and EAWM wind index in southern China (20-30°N, 110-130°E) simulated by CCSM3 (Wen et al, 2016); (f) zonal SST gradient between the west and east Pacific (Koutavas & Joanides, 2012) and El Niño variability from lakes Pallcacocha, Ecuador (Moy et al, 2002), and El Junco, Galapagos (Conroy et al, 2008). Meanwhile, in January and North American ice volume; (b) EAWM proxies in northern East Asian marginal sea including clay mineral ratio, grain size index in the middle Okinawa Trough (Zheng et al, 2014), and lignin record (Hao et al, 2017) in the central Yellow Sea; (c) simulated EAWM speed in northern East Asian marginal sea with KCM; (d) EAWM proxies in South China Sea including SST gradient between west and east (Huang et al, 2011) and between surface and thermocline waters ; (e) simulated EAWM speed in South China Sea with KCM and EAWM wind index in southern China (20-30°N, 110-130°E) simulated by CCSM3 (Wen et al, 2016); (f) zonal SST gradient between the west and east Pacific (Koutavas & Joanides, 2012) and El Niño variability from lakes Pallcacocha, Ecuador (Moy et al, 2002), and El Junco, Galapagos (Conroy et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Satellite observation and paleorecord studies have all demonstrated that the transport of sediments from the East Asian continent to the Yellow Sea and Okinawa Trough was mainly forced by the EAWM ( Figure S1 in the supporting information; Hao et al, 2017;Pang et al, 2016;Yuan et al, 2008;Zheng et al, 2014). Satellite observation and paleorecord studies have all demonstrated that the transport of sediments from the East Asian continent to the Yellow Sea and Okinawa Trough was mainly forced by the EAWM ( Figure S1 in the supporting information; Hao et al, 2017;Pang et al, 2016;Yuan et al, 2008;Zheng et al, 2014).…”

Section: Introductionmentioning

confidence: 91%

“…These studies have commonly suggested an intensified glacial EAWM compared to interglacial periods. In particular, paleoclimate proxies have suggested inconsistent EAWM patterns between the northern and southern East Asian regions since the middle Pleistocene (Hao et al, 2017;Huang, 2015;Steinke et al, 2011), suggesting that the EAWM complexity involves regional heterogeneities. In particular, paleoclimate proxies have suggested inconsistent EAWM patterns between the northern and southern East Asian regions since the middle Pleistocene (Hao et al, 2017;Huang, 2015;Steinke et al, 2011), suggesting that the EAWM complexity involves regional heterogeneities.…”

Section: Introductionmentioning

confidence: 99%

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Asynchronous Variation in the Quaternary East Asian Winter Monsoon Associated With the Tropical Pacific ENSO‐Like System

Zhao

Wan

Song

et al. 2019

Geophysical Research Letters

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Quaternary East Asian winter monsoon (EAWM) evolution has long been attributed to high‐latitude Northern Hemisphere climate change. However, it cannot explain the distinct relationships of the EAWM in the northern and southern East Asian marginal sea in paleoclimatic records. Here we present an EAWM record of the northern East China Sea over the past 300 ka and a transient climate simulation with the Kiel Climate Model through the Holocene. Both proxy record and simulation suggest anticorrelated long‐term EAWM evolution between the northern East China Sea and the South China Sea. We suggest that this spatial discrepancy of EAWM can be interpreted as El Niño–Southern Oscillation (ENSO)‐like controlling, which generates cyclonic/anticyclonic wind anomalies in the northern/southern East Asian marginal sea. This research explains much of the controversy in nonorbital scale variability of Quaternary EAWM records in the East Asian marginal sea and supports a potent role of tropical forcing in East Asian winter climate change.

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“…The development of the SH also leads to strengthening of the subtropical jet stream over SE China (Panagiotopoulous et al, 2005), a characteristic feature of the East Asia Winter Monsoon (EAWM, Cheang, 1987) and instrumental data (Wu and Wang, 2002;Jhun and Lee, 2004) show that strengthening of the SH results in a stronger than average EAWM. Paleoclimate data from Asia further indicates the strengthening of the EAWM at 4.2 ka cal BP (e.g., Hao et al, 2017;Giosan et al, 2018), likely linked to stronger and more frequent outbreaks of cold air from the core of the SH. Similarly, paleoclimate records from the outer limits of the region impacted by the SH have documented significant increases in the strength of the local winds, frequently a local diagnostic signature of the 4.2 ka BP event.…”

Section: Cold Europe and Southwest Asiamentioning

confidence: 99%

Blocking induced by the strengthened Siberian High led to drying in west Asia during the 4.2 ka BP event – a hypothesis

Perşoiu¹,

Ionita²,

Weiss³

2018

Preprint

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Abstract. Causal explanations for the 4.2 ka BP event are based on the amalgamation of seasonal and annual records of climate variability manifest across global regions dominated by different climatic regimes. However, instrumental and paleoclimate data indicate that seasonal climate variability is not always sequential in some regions. The present study investigates the spatial manifestation of the 4.2 ka BP event during the boreal winter season in Eurasia, where climate variability is a function of the spatio-temporal dynamics of the westerly winds. We present a multi-proxy reconstruction of winter climate conditions in Europe, west Asia and northern Africa between 4.3 and 3.8 ka BP. Our results show that, while winter temperatures were cold throughout the region, precipitation amounts had a heterogeneous distribution, with regionally significant low values in W Asia, SE and N Europe and local high values in the N Balkan Peninsula, the Carpathian Mountains, and E and NE Europe. Further, strong northerly winds were dominating in the Middle East, and E and NE Europe. Analyzing the relationships between these climatic conditions, we hypothesize that in the extratropical Northern Hemisphere, the 4.2 ka BP event was caused by the strengthening and expansion of the Siberian High, which effectively blocked the moisture-carrying westerlies from reaching W Asia, and enhanced outbreaks of cold and dry winds in that region. The antiphase behavior of the winter and summer monsoons suggests that when parts of Asia and Europe were experiencing winter droughts, SE Asia was experiencing similar summer droughts, resulting from failed and/or reduced monsoons. Thus, while in the extratropical regions of Eurasia the 4.2 ka BP event was a century-scale winter phenomenon, in the monsoon-dominated regions it may have been a feature of summer climate conditions.

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Intensified episodes of East Asian Winter Monsoon during the middle through late Holocene driven by North Atlantic cooling events: High-resolution lignin records from the South Yellow Sea, China

Cited by 32 publications

References 50 publications

Air-sea interactive forcing on phytoplankton productivity and community structure changes in the East China Sea during the Holocene

Air-sea interactive forcing on phytoplankton productivity and community structure changes in the East China Sea during the Holocene

Asynchronous Variation in the Quaternary East Asian Winter Monsoon Associated With the Tropical Pacific ENSO‐Like System

Blocking induced by the strengthened Siberian High led to drying in west Asia during the 4.2 ka BP event – a hypothesis

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