(Table S2) The reconstructed sea surface temperature (SST) over the eastern equatorial Pacific
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2016
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| _version_ | 1867170994083332096 |
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| author | Zhang, Yancheng Zhang, Xu Chiessi, Cristiano Mazur Mulitza, Stefan Zhang, Xiao Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, André Oliveira da Cruz Junior, Francisco William Wefer, Gerold |
| author_facet | Zhang, Yancheng Zhang, Xu Chiessi, Cristiano Mazur Mulitza, Stefan Zhang, Xiao Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, André Oliveira da Cruz Junior, Francisco William Wefer, Gerold |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_867293 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table S2) The reconstructed sea surface temperature (SST) over the eastern equatorial Pacific Zhang, Yancheng Zhang, Xu Chiessi, Cristiano Mazur Mulitza, Stefan Zhang, Xiao Lohmann, Gerrit Prange, Matthias Behling, Hermann Zabel, Matthias Govin, Aline Sawakuchi, André Oliveira da Cruz Junior, Francisco William Wefer, Gerold 202-1240; 202-1242; CD38-17P; Center for Marine Environmental Sciences; Cocos Ridge; Comment; COMPCORE; Composite Core; Difference; Equatorial East Pacific; Event label; GC; Giant piston corer; GPC; Gravity corer; IMAGES VIII - MONA; Joides Resolution; KNR195-5-CDH26; Leg202; Marion Dufresne (1995); MARUM; MD022529; MD02-2529; MD126; ME0005A; ME0005A-27JC; ME0005A-43JC; Melville; NEMO; North Pacific Ocean; PC; Piston corer; Reference/source; Sample code/label; Sea surface temperature; South Pacific Ocean; Species; TR163-19; TR163-22; V19; V19-27; V19-28; V19-30; V21; V21-30; Vema 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. |
| title | (Table S2) The reconstructed sea surface temperature (SST) over the eastern equatorial Pacific |
| topic | 202-1240; 202-1242; CD38-17P; Center for Marine Environmental Sciences; Cocos Ridge; Comment; COMPCORE; Composite Core; Difference; Equatorial East Pacific; Event label; GC; Giant piston corer; GPC; Gravity corer; IMAGES VIII - MONA; Joides Resolution; KNR195-5-CDH26; Leg202; Marion Dufresne (1995); MARUM; MD022529; MD02-2529; MD126; ME0005A; ME0005A-27JC; ME0005A-43JC; Melville; NEMO; North Pacific Ocean; PC; Piston corer; Reference/source; Sample code/label; Sea surface temperature; South Pacific Ocean; Species; TR163-19; TR163-22; V19; V19-27; V19-28; V19-30; V21; V21-30; Vema |
| url | https://doi.org/10.1594/PANGAEA.867293 |