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South China Sea hydrological changes and Pacific Walker Circulation variations over the last millennium.

Yan H, Sun L, Oppo DW, Wang Y, Liu Z, Xie Z, Liu X, Cheng W - Nat Commun (2011)

Bottom Line: Here we show that north-south ITCZ migration was not the only mechanism of tropical Pacific hydrologic variability during the last millennium, and that PWC variability profoundly influenced tropical Pacific hydrology.Our downcore grain size reconstructions indicate that this site received less precipitation during relatively warm periods, AD 1000-1400 and AD 1850-2000, compared with the cool period (AD 1400-1850).Including our new reconstructions in a synthesis of tropical Pacific records results in a spatial pattern of hydrologic variability that implicates the PWC.

View Article: PubMed Central - PubMed

Affiliation: Institute of Polar Environment, Department of Earth and Space Science, University of Science and Technology of China, Hefei, Anhui 230026, China.

ABSTRACT
The relative importance of north-south migrations of the intertropical convergence zone (ITCZ) versus El Niño-Southern Oscillation and its associated Pacific Walker Circulation (PWC) variability for past hydrological change in the western tropical Pacific is unclear. Here we show that north-south ITCZ migration was not the only mechanism of tropical Pacific hydrologic variability during the last millennium, and that PWC variability profoundly influenced tropical Pacific hydrology. We present hydrological reconstructions from Cattle Pond, Dongdao Island of the South China Sea, where multi-decadal rainfall and downcore grain size variations are correlated to the Southern Oscillation Index during the instrumental era. Our downcore grain size reconstructions indicate that this site received less precipitation during relatively warm periods, AD 1000-1400 and AD 1850-2000, compared with the cool period (AD 1400-1850). Including our new reconstructions in a synthesis of tropical Pacific records results in a spatial pattern of hydrologic variability that implicates the PWC.

No MeSH data available.


Linking sediment grain size to SOI.Comparison of the DY6 sediment mean grain size (DY6-MGS) and 10-year-smoothing instrumental SOI1516 over the last 140 years. (SOI data come from http://www.cgd.ucar.edu/cas/catalog/climind/SOI.signal.annstd.ascii).
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f2: Linking sediment grain size to SOI.Comparison of the DY6 sediment mean grain size (DY6-MGS) and 10-year-smoothing instrumental SOI1516 over the last 140 years. (SOI data come from http://www.cgd.ucar.edu/cas/catalog/climind/SOI.signal.annstd.ascii).

Mentions: Comparison to the instrumental record of the SOI indicates that mean grain size is most likely related to rainfall-controlled transport energy. The regression of the mean grain size from DY6 against 10-year averaged SOI values1516 yields a significant and positive correlation over the past 140 years (r=0.58, P<0.01) (Fig. 2 and Supplementary Fig. S7), with greater mean grain size corresponding to more precipitation on the island. Therefore, the change of transport energy associated with rainfall is probably the key factor controlling mean grain size variations. With increased rainfall, surface runoff increases; its greater erosion force brings larger terrestrial particles to the pond19.


South China Sea hydrological changes and Pacific Walker Circulation variations over the last millennium.

Yan H, Sun L, Oppo DW, Wang Y, Liu Z, Xie Z, Liu X, Cheng W - Nat Commun (2011)

Linking sediment grain size to SOI.Comparison of the DY6 sediment mean grain size (DY6-MGS) and 10-year-smoothing instrumental SOI1516 over the last 140 years. (SOI data come from http://www.cgd.ucar.edu/cas/catalog/climind/SOI.signal.annstd.ascii).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3104522&req=5

f2: Linking sediment grain size to SOI.Comparison of the DY6 sediment mean grain size (DY6-MGS) and 10-year-smoothing instrumental SOI1516 over the last 140 years. (SOI data come from http://www.cgd.ucar.edu/cas/catalog/climind/SOI.signal.annstd.ascii).
Mentions: Comparison to the instrumental record of the SOI indicates that mean grain size is most likely related to rainfall-controlled transport energy. The regression of the mean grain size from DY6 against 10-year averaged SOI values1516 yields a significant and positive correlation over the past 140 years (r=0.58, P<0.01) (Fig. 2 and Supplementary Fig. S7), with greater mean grain size corresponding to more precipitation on the island. Therefore, the change of transport energy associated with rainfall is probably the key factor controlling mean grain size variations. With increased rainfall, surface runoff increases; its greater erosion force brings larger terrestrial particles to the pond19.

Bottom Line: Here we show that north-south ITCZ migration was not the only mechanism of tropical Pacific hydrologic variability during the last millennium, and that PWC variability profoundly influenced tropical Pacific hydrology.Our downcore grain size reconstructions indicate that this site received less precipitation during relatively warm periods, AD 1000-1400 and AD 1850-2000, compared with the cool period (AD 1400-1850).Including our new reconstructions in a synthesis of tropical Pacific records results in a spatial pattern of hydrologic variability that implicates the PWC.

View Article: PubMed Central - PubMed

Affiliation: Institute of Polar Environment, Department of Earth and Space Science, University of Science and Technology of China, Hefei, Anhui 230026, China.

ABSTRACT
The relative importance of north-south migrations of the intertropical convergence zone (ITCZ) versus El Niño-Southern Oscillation and its associated Pacific Walker Circulation (PWC) variability for past hydrological change in the western tropical Pacific is unclear. Here we show that north-south ITCZ migration was not the only mechanism of tropical Pacific hydrologic variability during the last millennium, and that PWC variability profoundly influenced tropical Pacific hydrology. We present hydrological reconstructions from Cattle Pond, Dongdao Island of the South China Sea, where multi-decadal rainfall and downcore grain size variations are correlated to the Southern Oscillation Index during the instrumental era. Our downcore grain size reconstructions indicate that this site received less precipitation during relatively warm periods, AD 1000-1400 and AD 1850-2000, compared with the cool period (AD 1400-1850). Including our new reconstructions in a synthesis of tropical Pacific records results in a spatial pattern of hydrologic variability that implicates the PWC.

No MeSH data available.