noaa-recon-14428 Indo-Pacific Warm Pool Last Glacial Maximum Hydroclimate Proxy Synthesis DiNezio, P.N.; Tierney, J.E. Indo-Pacific Warm Pool Last Glacial Maximum Hydroclimate Proxy Synthesis 2013-05-19 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/14428 Investigator P.N. DiNezio Investigator J.E. Tierney earth science paleoclimate climate reconstructions notes,null,null,null,null,climate reconstructions,null,null,C,Proxy earth science paleoclimate climate reconstructions number of samples,null,null,count,null,climate reconstructions,null,null,N,number of observations earth science paleoclimate climate reconstructions notes,null,null,null,null,climate reconstructions,null,null,C,reference earth science paleoclimate climate reconstructions notes,null,null,null,null,climate reconstructions,null,null,N,"whether the observations merged into each ""gridded"" point agree (is_robust=1) or not (is_robust=0)" earth science paleoclimate climate reconstructions moisture index,multiple proxies,null,dimensionless,null,climate reconstructions,null,null,N,"""KEY: -1 = Drier, 0 = No Change, 1 =Wetter""" earth science paleoclimate climate reconstructions longitude,null,null,degree east,null,climate reconstructions,null,null,N,null earth science paleoclimate climate reconstructions salinity,multiple proxies|sea surface,null,dimensionless,null,climate reconstructions,null,null,N,"""KEY: -1 = Fresher, 0 = No Change, 1 = Saltier""" earth science paleoclimate climate reconstructions latitude,null,null,degree north,null,climate reconstructions,null,null,N,null earth science paleoclimate climate reconstructions notes,null,null,null,null,climate reconstructions,null,null,N,"""chrono_flag=1"" indicates whether the proxy record contains one or more radiocarbon U/Th or well-constrained OSL dates near to or during the LGM. chrono_flag=0 indicates that the LGM was dated via wiggle-matching the local benthic d18O to a global stack or another method." earth science paleoclimate climate reconstructions sample identification,null,null,null,null,climate reconstructions,null,null,C,location plus core ID earth science paleoclimate reconstructions precipitation geoscientificInformation Last Glacial Maximum Other Hydroclimate Reconstruction Warm Pool hydrology 21000 cal yr BP 18000 cal yr BP Complete -16 20 55 -155 0 0 Ocean Pacific Ocean Western Pacific Ocean Indo-Pacific Warm Pool>LATITUDE >LONGITUDE None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Pedro N. DiNezio and Jessica E. Tierney. 2013. The effect of sea level on glacial Indo-Pacific climate. Nature Geoscience, DOI: 10.1038/ngeo1823. Published online 19-May-2013

The Indo-Pacific warm pool - the main source of heat and moisture to the global atmosphere - plays a prominent role in tropical and global climate variability. During the Last Glacial Maximum, temperatures within the warm pool were cooler than today and precipitation patterns were altered, but the mechanism responsible for these shifts remains unclear. Here we use a synthesis of proxy reconstructions of warm pool hydrology and a multi-model ensemble of climate simulations to assess the drivers of these changes. The proxy data suggest drier conditions throughout the centre of the warm pool and wetter conditions in the western Indian and Pacific oceans. Only one model out of twelve simulates a pattern of hydroclimate change similar to our reconstructions, as measured by the Cohen's K statistic. Exposure of the Sunda Shelf by lower glacial sea level plays a key role in the hydrologic pattern simulated by this model, which results from changes in the Walker circulation driven by weakened convection over the warm pool. We therefore conclude that on glacial-interglacial timescales, the growth and decay of ice sheets exert a first-order influence on tropical climate through the associated changes in global sea level. STUDY NOTES: Synthesis of hydroclimatic proxy records for the Indo-Pacific Warm Pool at the Last Glacial Maximum, indicating wet or dry hydroclimatic conditions from both marine and terrestrial proxies. terr_raw and marine_raw contain the locations and hydroclimate state at the LGM from a collection of proxy records. Their "val" field indicates whether the proxy captured dry(val=-1)/unchanged(val=0)/wetter(val=1) or fresh(val=-1)/unchanged(val=0)/salty(val=1) climate at the LGM. "n_obs" is the number of proxy techniques used to estimate LGM hydroclimate from each location. is_robust=1 indicates when different proxy techniques agree in their estimates of LGM hydroclimate at each location. is_robust also takes the value of 1 when only one proxy technique is used. "chrono_flag=1" indicates whether the proxy record contains one or more radiocarbon U/Th or well-constrained OSL dates near to or during the LGM. chrono_flag=0 indicates that the LGM was dated via wiggle-matching the local benthic d18O to a global stack or another method. terr_gridded and marine_gridded are the final "gridded" data as seen in the main text of DiNezio and Tierney (2013), in which proxies were averaged within a search radius of 150 km. The "is_robust" field of terr_gridded and marine_gridded indicates whether the observations merged into each "gridded" point agree (is_robust=1) or not (is_robust=0). See DiNezio and Tierney (2013) for more details.

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