Prehistoric heavy metal pollution on the continental shelf off Hainan Island, South China Sea: From natural to anthropogenic impacts around 4.0 kyr BP

Human–environment interactions across historical periods in China have been well reconstructed over the past decade; however, few studies have focused on southern China, particularly Hainan Island. This study investigated two sediment cores (cores X1 and X2) collected from the continental shelf off Hainan Island in the northern South China Sea. Combined with geochemical compositions (Al, Ni, Cu, Zn, Cd, and Pb), Sr-Nd isotopes, grain size, and AMS 14C ages, our results showed that Cd and Cu in core X1 and Cd and Pb in core X2 have been mainly influenced by anthropogenic activities since ~4.0 kyr BP. The enrichment factors showed obvious increases starting at ~4.0 kyr BP and were in good accordance with the appearance of abundant archeological sites on Hainan Island. Significant climatic changes (i.e. decreases in the East Asian summer monsoon and increases in El Niño–Southern Oscillation activities) at ~4.0 kyr BP likely promoted more intense, localized human activities, which in turn enhanced heavy metal accumulation in the continental shelf sediments. These results provide new insights into the history of human activities on Hainan Island and indicate that the geochemical compositions of continental shelf sediments have the potential for broadening our knowledge of the human activities and cultural development in tropical areas.

[1]  B. Deng,et al.  Distribution patterns of particle-reactive radionuclides in sediments off eastern Hainan Island, China: Implications for source and transport pathways , 2013 .

[2]  P. deMenocal,et al.  Climate change and the collapse of the Akkadian empire: Evidence from the deep sea , 2000 .

[3]  M. Y. Ishak,et al.  Evaluation and assessment of baseline metal contamination in surface sediments from the Bernam River, Malaysia , 2016, Environmental Science and Pollution Research.

[4]  Q. Hua,et al.  Holocene marine 14C reservoir age variability: Evidence from 230Th‐dated corals in the South China Sea , 2010 .

[5]  S. Rodionov.  A sequential algorithm for testing climate regime shifts , 2004 .

[6]  R. Wu,et al.  Evolution of ENSO-Related Rainfall Anomalies in East Asia , 2003 .

[7]  Helong Wei,et al.  Clay mineralogy of the riverine sediments of Hainan Island, South China Sea: Implications for weathering and provenance , 2014 .

[8]  Feiyue Wang,et al.  Modeling sorption of trace metals on natural sediments by surface complexation model , 1997 .

[9]  Jürgen Wunderlich,et al.  Environmental changes during the Holocene climatic optimum in central Europe - human impact and natural causes , 2003 .

[10]  Tian Chengjin.  Spatial Distribution of Magnetic Susceptibility and Its Provenance Implication of Surface Sediments in the Sea Areas around the Hainan Island , 2013 .

[11]  Shouye Yang,et al.  Heavy metal enrichments in the Changjiang (Yangtze River) catchment and on the inner shelf of the East China Sea over the last 150 years. , 2016, The Science of the total environment.

[12]  R. Edwards,et al.  Seasonal and interannual variability of the Mid-Holocene East Asian monsoon in coral δ18O records from the South China Sea , 2005 .

[13]  Chaosheng Zhang,et al.  Grain size effect on multi-element concentrations in sediments from the intertidal flats of Bohai Bay, China , 2002 .

[14]  Xiaoqiang Li,et al.  Early bronze in two Holocene archaeological sites in Gansu, NW China , 2009, Quaternary Research.

[15]  R. Kerr.  Sea-Floor Dust Shows Drought Felled Akkadian Empire , 1998, Science.

[16]  Congxian Li,et al.  Discrimination of geochemical compositions between the Changjiang and the Huanghe sediments and its application for the identification of sediment source in the Jiangsu coastal plain, China , 2002 .

[17]  Zhan Lian,et al.  A study of intra-seasonal variations in the subsurface water temperatures in the South China Sea , 2019, Acta Oceanologica Sinica.

[18]  R. Lawrence Edwards,et al.  A Test of Climate, Sun, and Culture Relationships from an 1810-Year Chinese Cave Record , 2008, Science.

[19]  V. Udachin,et al.  Lakes ecosystem response to Holocene climate changes and human impact in the Southern Urals: Diatom and geochemical proxies , 2017 .

[20]  G. Verstraeten,et al.  Reconstruction and semi-quantification of human impact in the Dijle catchment, central Belgium: a palynological and statistical approach , 2014 .

[21]  C. Buck,et al.  IntCal13 and Marine13 Radiocarbon Age Calibration Curves 0–50,000 Years cal BP , 2013, Radiocarbon.

[22]  Yongfang Zhao,et al.  Heavy metals in the surface sediments of the northern portion of the South China Sea shelf: distribution, contamination, and sources , 2016, Environmental Science and Pollution Research.

[23]  Saruli,et al.  Competitive adsorption, release and speciation of heavy metals in the Yellow River sediments, China , 2007 .

[24]  A. Brauer,et al.  Varve microfacies and varve preservation record of climate change and human impact for the last 6000 years at Lake Tiefer See (NE Germany) , 2017 .

[25]  Y. Zong,et al.  Climatic and palaeoecological changes during the mid- to Late Holocene transition in eastern China: high-resolution pollen and non-pollen palynomorph analysis at Pingwang, Yangtze coastal lowlands , 2014 .

[26]  P. Grootes,et al.  Climate change at the 4.2 ka BP termination of the Indus valley civilization and Holocene south Asian monsoon variability , 2003 .

[27]  Hai Cheng,et al.  A high-resolution, absolute-dated Holocene and deglacial Asian monsoon record from Dongge Cave, China , 2003 .

[28]  Anchun Li,et al.  Human impact overwhelms long-term climate control of weathering and erosion in southwest China , 2015 .

[29]  Kazuya Takahashi,et al.  JNdi-1: a neodymium isotopic reference in consistency with LaJolla neodymium , 2000 .

[30]  Jing Zhang,et al.  Riverine composition and estuarine geochemistry of particulate metals in China-weathering features, anthropogenic impact and chemical fluxes , 2002 .

[31]  C. Pelejero,et al.  Holocene variations in Asian monsoon moisture: A bidecadal sediment record from the South China Sea , 1999 .

[32]  D. Beilman,et al.  Response of chironomids to Neolithic land-use change in north-west Ireland , 2017 .

[33]  Peter Bellwood.  The prehistory of Island Southeast Asia: A multidisciplinary review of recent research , 1987 .

[34]  Eiji Matsumoto,et al.  Climate change and human impact on the Song Hong (Red River) Delta, Vietnam, during the Holocene , 2006 .

[35]  W. Timothy Liu,et al.  Spacebased observations of the seasonal changes of south Asian monsoons and oceanic responses , 1999 .

[36]  J. Overpeck,et al.  Holocene changes in eastern tropical Pacific climate inferred from a Galápagos lake sediment record , 2008 .

[37]  Xuebo Yin,et al.  Trace metals in the surface sediments of the eastern continental shelf of Hainan Island: Sources and contamination. , 2015, Marine pollution bulletin.

[38]  R. Seager,et al.  Suppression of El Niño during the Mid‐Holocene by changes in the Earth's orbit , 2000 .

[39]  Jing Zhang,et al.  Land–sea interactions at the east coast of Hainan Island, South China Sea: A synthesis , 2013 .

[40]  P. Webster,et al.  Monsoons: Processes, predictability, and the prospects for prediction , 1998 .

[41]  Gan Zhang,et al.  Seven thousand years of records on the mining and utilization of metals from lake sediments in central China. , 2008, Environmental science & technology.

[42]  Y. Zong,et al.  Changes in sea level, water salinity and wetland habitat linked to the late agricultural development in the Pearl River delta plain of China , 2013 .

[43]  Helong Wei,et al.  Occurrence and distribution of heavy metals in surface sediments of the Changhua River Estuary and adjacent shelf (Hainan Island). , 2013, Marine pollution bulletin.

[44]  Wu Wenxiang,et al.  Possible role of the “Holocene Event 3” on the collapse of Neolithic Cultures around the Central Plain of China , 2004 .

[45]  T. Pohlmann,et al.  A western boundary upwelling system response to recent climate variation (1960-2006) , 2013 .

[46]  C. German,et al.  An improved method for extracting marine sediment fractions and its application to Sr and Nd isotopic analysis , 2002 .

[47]  T. Vegas-Vilarrúbia,et al.  Vegetation shifts, human impact and peat bog development in Bassa Nera pond (Central Pyrenees) during the last millennium , 2017 .

[48]  P. deMenocal.  Cultural Responses to Climate Change During the Late Holocene , 2001, Science.

[49]  G. Wasserburg,et al.  Sm-Nd isotopic evolution of chondrites , 1980 .

[50]  G. Wei,et al.  Recent 121‐year variability of western boundary upwelling in the northern South China Sea , 2013 .

[51]  David M. Anderson,et al.  Variability of El Niño/Southern Oscillation activity at millennial timescales during the Holocene epoch , 2002, Nature.

[52]  J. Huang,et al.  Trace metals in the surface sediments of the intertidal Jiaozhou Bay, China: Sources and contamination assessment. , 2016, Marine pollution bulletin.