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Zhang, Yancheng; Zhang, Xu; Chiessi, Cristiano Mazur; Mulitza, Stefan; Zhang, Xiao; Lohmann, Gerrit; Prange, Matthias; Behling, Hermann; Zabel, Matthias; Govin, Aline; Sawakuchi, André O; Cruz, Francisco W; Wefer, Gerold (2016): (Table S2) The reconstructed sea surface temperature (SST) over the eastern equatorial Pacific. PANGAEA, https://doi.org/10.1594/PANGAEA.867293, Supplement to: Zhang, Y et al. (2016): Equatorial Pacific forcing of western Amazonian precipitation during Heinrich Stadial 1. Scientific Reports, 6, 35866, https://doi.org/10.1038/srep35866

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Abstract:
Abundant hydroclimatic evidence from western Amazonia and the adjacent Andes documents wet conditions during Heinrich Stadial 1 (HS1, 18-15 ka), a cold period in the high latitudes of the North Atlantic. This precipitation anomaly was attributed to a strengthening of the South American summer monsoon due to a change in the Atlantic interhemispheric sea surface temperature (SST) gradient. However, the physical viability of this mechanism has never been rigorously tested. We address this issue by combining a thorough compilation of tropical South American paleorecords and a set of atmosphere model sensitivity experiments. Our results show that the Atlantic SST variations alone, although leading to dry conditions in northern South America and wet conditions in northeastern Brazil, cannot produce increased precipitation over western Amazonia and the adjacent Andes during HS1. Instead, an eastern equatorial Pacific SST increase (i.e., 0.5-1.5 °C), in response to the slowdown of the Atlantic Meridional Overturning Circulation during HS1, is crucial to generate the wet conditions in these regions. The mechanism works via anomalous low sea level pressure over the eastern equatorial Pacific, which promotes a regional easterly low-level wind anomaly and moisture recycling from central Amazonia towards the Andes.
Source data set:
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Coverage:
Median Latitude: 0.910359 * Median Longitude: -85.815121 * South-bound Latitude: -3.990000 * West-bound Longitude: -92.398000 * North-bound Latitude: 8.205500 * East-bound Longitude: -81.310000
Date/Time Start: 1963-04-05T00:00:00 * Date/Time End: 2002-06-23T05:05:00
Minimum Elevation: -3091.0 m * Maximum Elevation: -617.0 m
Event(s):
202-1240 * Latitude: 0.021850 * Longitude: -86.462630 * Date/Time: 2002-05-16T00:00:00 * Elevation: -2920.8 m * Penetration: 613.1 m * Recovery: 622.5 m * Location: Equatorial East Pacific * Campaign: Leg202 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 65 cores; 603.7 m cored; 9.4 m drilled; 103.1 % recovery
202-1242 * Latitude: 7.855867 * Longitude: -83.606967 * Date/Time: 2002-05-26T00:00:00 * Elevation: -1363.7 m * Penetration: 770.3 m * Recovery: 770.5 m * Location: North Pacific Ocean * Campaign: Leg202 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 80 cores; 743.8 m cored; 26.5 m drilled; 103.6 % recovery
CD38-17P * Latitude: -1.600000 * Longitude: -90.430000 * Elevation: -2580.0 m
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEventZhang, Yancheng
2Sample code/labelSample labelZhang, Yancheng
3CommentCommentZhang, YanchengApproach
4SpeciesSpeciesZhang, Yancheng
5Sea surface temperatureSST°CZhang, YanchengHS1 mean
6Sea surface temperatureSST°CZhang, YanchengLGM mean
7DifferenceDiffZhang, YanchengDifference (HS1-LGM)
8CommentCommentZhang, YanchengDifference (HS1-LGM)
9Reference/sourceReferenceZhang, Yancheng
Size:
88 data points

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