Centennial-scale East Asian summer monsoon intensity based on δ<sup>18</sup>O values in ostracode shells and its relationship to land-ocean air temperature gradients over the past 1700 years

Yamada, Keigo; Masuma, Tetsuro; Sakai, Saburo; Seto, Kazuto; Ogusa, Hiroki; Irizuki, Toshiaki

doi:10.1130/g37535.1

Cited by 11 publications

(23 citation statements)

References 32 publications

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“…From the east coast of the Korean Peninsula, the Lake Hwajinpo microfossil record revealed four distinct EASM strengthening events at 1250 CE (Event 1), 1450 CE (Event 2), 1550 CE (Event 3), and 1900 CE (Event 4; Figure ). The EASM record from Lake Nakaumi (Japan; Yamada et al, ) shows remarkably similar trends with the Lake Hwajinpo record, displaying the same EASM strengthened events, except for Event 4 (Figure ). The diatom‐based reconstructed winter sea surface temperature in the Okinawa Trough (Li et al, ) also shows striking similarity to the Hwajinpo record (Figure ), even though there are slight age discrepancies for Events 1 and 4.…”

Section: Discussionmentioning

confidence: 61%

“…hadai in Core Hw12‐A, Lake Hwajinpo. (b) δ 18 O of ostracode Bicornucythere bisanensis (Okubo) in Lake Nakaumi, Japan (Yamada et al, ). (c) Reconstructed sea surface temperature based on diatom data of Core MD05‐2908 from the Okinawa Trough (Li et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…These may result in complicated spatial monsoon patterns in continental China (J. Chen et al, , ). Because the limit of monsoonal influence may vary with relative strength of the EASM and ISM, it is possible that oceanic proxies (Li et al, ; Yamada et al, ) and Chinese continental records (Wang et al, ; Yi et al, ; Zheng et al, ) might better represent two alternate sources of precipitation, respectively. This may be consistent with spatial difference of wetness between southeastern (comparatively more coastal) and northwestern (comparatively more continental) parts of monsoonal eastern China (J. Chen et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Yet studies of stalagmite δ 18 O records in Chinese caves do not indicate consistent fluctuations in monsoonal precipitation on decadal to centennial scales for the past millennium (Chu et al, ; Tan et al, ). Broadly speaking, EASM behavior could vary between oceanic and continental settings due to the position of the Pacific air mass (Nakagawa et al, ), yet currently almost all EASM records on decadal to centennial scales for the past millennium are from continental China (predominantly Chinese stalagmites; Yamada et al, ). Liu et al () indicated that Chinese stalagmite records may not be reliable indicators of EASM strength, but rather an isotopic composition proxy for Indian summer monsoon (ISM) precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Decadal‐ to Centennial‐Scale East Asian Summer Monsoon Variability Over the Past Millennium: An Oceanic Perspective

Cheung

Yasuhara

Mamo

et al. 2018

Geophysical Research Letters

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The East Asian summer monsoon (EASM) is a key component of the Asian Monsoon system affecting regional precipitation in East Asia and thus human culture, society, and development. Despite this, decadal‐ to centennial‐scale EASM dynamics remain poorly understood over the last millennium. Here we used high‐resolution benthic microfossil proxies to reconstruct EASM variability for the last 1,000 years from a brackish lake in South Korea. We compared this EASM record with Asian Monsoon proxy records from East China (i.e., continental proxy) and East Asian coasts (i.e., oceanic setting), and identified four pervasive EASM strengthening events at 1250, 1450, 1550, and 1900 CE and their deviation, likely related to land‐ocean temperature gradients. Our results indicate that data from the oceanic setting under the direct influence of the Pacific High are important in understanding the EASM dynamics over the last millennium. It is also noteworthy that EASM variability shows striking similarity to changes in the Atlantic meridional overturning circulation, implying the causal relationship.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decadal‐ to Centennial‐Scale East Asian Summer Monsoon Variability Over the Past Millennium: An Oceanic Perspective

Cheung

Yasuhara

Mamo

et al. 2018

Geophysical Research Letters

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“…Because their average value is close to 0, Yamada et al . (, ) argued that Δ R values for Lake Nakaumi are 0 years. Therefore, we adopted 0 years as the Δ R value for this core.…”

Section: Methodsmentioning

confidence: 99%

Flooding history of Lake Nakaumi, western Japan, inferred from sediment records spanning the past 700 years

Ota

Kawahata

Sato

et al. 2017

J Quaternary Science

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Management of flood risk can benefit from a knowledge‐based approach to flooding history. However, the data on such events are often insufficient for an objective evaluation of flooding characteristics such as their intensity. Therefore, we analyzed a 14C‐dated sediment core recovered from near the Iinashi River mouth in Lake Nakaumi, western Japan, and reconstructed flooding records over the past 700 years from rock magnetism, grain‐size distribution and sediment geochemistry. The sediment core contained three black layers, characterized by high magnetic susceptibility, low anhysteretic remanent magnetization to saturation isothermal remanent magnetization ratio, high total organic carbon (TOC) to total nitrogen ratio, and coarse mean grain size, which we identified as possible flooding event deposits. Moreover, the chemical index of alteration was low and the TOC to total sulfur ratio was high in these layers, indicating intensified erosion associated with more freshwater inflow due to the flood events. We tentatively correlated the three event deposits with historical floods along the Iinashi River in AD 1596, 1666 and 1826. The variations in rock magnetic and geochemical properties suggest that the flooding in AD 1666 may have been the least extreme of the events detected in the core.

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Interdecadal variability of summer extreme rainfall in the Huai River basin of China associated with the Asian‐Pacific Oscillation

Liao

Zhao

2023

Intl Journal of Climatology

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Using the rainfall data at rain gauge stations in China and the European Center for Medium‐Range Weather Forecast (ECMWF) reanalysis, the daily Asian‐Pacific Oscillation (APO) index, a tropospheric temperature thermal contrast between Asia and the North Pacific, is constructed to investigate an interdecadal relationship between summer (June–July) APO and rainfall in the Huai River basin (HRB) of central‐eastern China. The daily APO index averaged over June 22–July 12 shows an interdecadal shift around the late 1990s. This shift is characterized by a negative phase of the daily APO index during 1987–1996 and a subsequent positive phase during 1997–2006. Accompanying this shift, the occurrence frequency, intensity and amount of extreme rainfall events remarkably increase in the HRB region. The increased rainfall can be reasonably explained by the atmospheric circulation anomalies. Corresponding to the decadal change in the summer daily APO from the negative phase to the positive one, the subtropical high pressure over the western North Pacific moves toward the north and easterly wind anomalies in the middle and lower layers of the troposphere prevail over extratropical East Asia, which strengthens water vapour convergence, the instability of atmospheric stratification and upward motion anomalies in the HRB region.

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Centennial-scale East Asian summer monsoon intensity based on δ¹⁸O values in ostracode shells and its relationship to land-ocean air temperature gradients over the past 1700 years

Cited by 11 publications

References 32 publications

Decadal‐ to Centennial‐Scale East Asian Summer Monsoon Variability Over the Past Millennium: An Oceanic Perspective

Decadal‐ to Centennial‐Scale East Asian Summer Monsoon Variability Over the Past Millennium: An Oceanic Perspective

Flooding history of Lake Nakaumi, western Japan, inferred from sediment records spanning the past 700 years

Interdecadal variability of summer extreme rainfall in the Huai River basin of China associated with the Asian‐Pacific Oscillation

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Centennial-scale East Asian summer monsoon intensity based on δ18O values in ostracode shells and its relationship to land-ocean air temperature gradients over the past 1700 years

Cited by 11 publications

References 32 publications

Decadal‐ to Centennial‐Scale East Asian Summer Monsoon Variability Over the Past Millennium: An Oceanic Perspective

Decadal‐ to Centennial‐Scale East Asian Summer Monsoon Variability Over the Past Millennium: An Oceanic Perspective

Flooding history of Lake Nakaumi, western Japan, inferred from sediment records spanning the past 700 years

Interdecadal variability of summer extreme rainfall in the Huai River basin of China associated with the Asian‐Pacific Oscillation

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Centennial-scale East Asian summer monsoon intensity based on δ¹⁸O values in ostracode shells and its relationship to land-ocean air temperature gradients over the past 1700 years