NOAA/WDS Paleoclimatology - Western North America LGM Ensemble Hydroclimatic Reconstructions
This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Climate Reconstruction. The data include parameters of climate reconstructions with a geographic location of North America. The time period coverage is from 23000 to 19000 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data.
Dataset Citation
- Cite as: Oster, J.L.; Ibarra, D.E.; Winnick, M.J.; Maher, K. (2015-02-23): NOAA/WDS Paleoclimatology - Western North America LGM Ensemble Hydroclimatic Reconstructions. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/bfbd-0y38. Accessed [date].
- Please refer to Credit tab for full citation information.
Dataset Identifiers
- doi:10.25921/bfbd-0y38
- noaa-recon-18015
- NCEI DSI 1200_02
- NCEI DSI 1200_01
ISO 19115-2 Metadata
noaa-recon-18015
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | Data Center Contact NOAA World Data Service for Paleoclimatology 828-271-4800 paleo@noaa.gov |
Coverage Description | Date Range: 23000 cal yr BP to 19000 cal yr BP; |
Time Period | -21050 to -17050 |
Spatial Bounding Box Coordinates |
West: -124.07
East: -105.14
South: 31.3
North: 47.61
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Data update frequency not available |
Supplemental Information | STUDY NOTES: Synthesis of hydoclimatic proxy records for western North America at the Last Glacial Maximum, indicating wet or dry hydroclimatic conditions relative to today from proxy reconstructions. Proxies table contains the locations and hydroclimate state at the LGM from a collection of proxy records. ABSTRACT SUPPLIED BY ORIGINATOR: The hydroclimate history of North America includes the formation and desiccation of large inland lakes and the growth and ablation of glaciers throughout the Quaternary period. At the Last Glacial Maximum, expanded pluvial lakes in the south and aridity in the northwest suggest that the winter westerly storm track was displaced southwards and migrated northwards as the Laurentide Ice Sheet waned. However, lake highstands do not occur synchronously along zonal bands, in conflict with this hypothesis. Here we compile a network of precipitation proxy reconstructions from lakes, speleothems, groundwater deposits, pack rat middens and glaciers from the western and southwestern US, which we compare with an ensemble of climate simulations to identify the controls of regional hydroclimatic change. The proxy records suggest a precipitation dipole during the Last Glacial Maximum, with wetter than modern conditions in the southwest and drier conditions near the ice sheet, and a northwest-southeast trending transition zone across the northern Great Basin. The models that simulate a weaker and south-shifted Aleutian low-pressure system, a strong North Pacific high-pressure system, and a high above the ice sheet best reproduce this regional variation. We therefore conclude that rather than a uniformly south-shifted storm track, a stronger jet that is squeezed and steered across the continent by high-pressure systems best explains the observed regional hydroclimate patterns of the Last Glacial Maximum. |
Purpose | Records of past temperature, precipitation, and other climate variables derived from paleoclimate proxies. Parameter keywords describe what was measured in this data set. Additional summary information can be found in the abstracts of papers listed in the data set citations. |
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Last Modified: 2024-03-21
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov