scholarly journals Contrasting rainfall patterns over North America during the Holocene and Last Interglacial as recorded by sediments of the northern Gulf of Mexico

2011 ◽  
Vol 38 (14) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jean-Carlos Montero-Serrano ◽  
Viviane Bout-Roumazeilles ◽  
Anders E. Carlson ◽  
Nicolas Tribovillard ◽  
Aloys Bory ◽  
...  
Keyword(s):  
North America ◽  
Gulf Of Mexico ◽  
Last Interglacial ◽  
The Holocene ◽  
Northern Gulf Of Mexico ◽  
Rainfall Patterns

Latest Quaternary sedimentation in the northern Gulf of Mexico intraslope basin province: II — Stratigraphic analysis and relationship to glacioeustatic climate change

2016 ◽  
Vol 4 (1) ◽  
pp. SC81-SC95 ◽  
Author(s):  
Hilary Clement Olson ◽  
John E. Damuth ◽  
C. Hans Nelson
Keyword(s):  
Gulf Of Mexico ◽  
Last Interglacial ◽  
Submarine Fan ◽  
The Holocene ◽  
Northern Gulf Of Mexico ◽  
Last Glacial ◽  
Stratigraphic Analysis ◽  
Turbidite System ◽  
Mass Transport Deposits ◽  
The Trinity

Stratigraphic zonation of 139 piston cores from the intraslope basin province of the northern Gulf of Mexico based on the Globorotalia menardii complex and calcium carbonate fluctuations shows that the vast majority of the cores contain sediments only of Holocene (Z zone) and Late Wisconsin (Y zone, Last Glacial) age. Only 13 widely spaced cores penetrate sediments of Last Interglacial (X zone) age. Overall, sedimentation rates average approximately 13 cm for the Holocene, but they range up to 600 cm. Redeposited sediments (mass-transport deposits and/or turbidites) occur in cores from the Rio Grande Submarine Fan, the East Breaks Slide Complex, the Trinity-Brazos Turbidite System, and the Bryant Canyon Turbidite System. Stratigraphic zonation of suites of cores from these areas shows that nearly all of these deposits were emplaced during Late Wisconsin (Y zone, Last Glacial). Redeposited sediments in the Holocene (Z zone) are rare.

North American rainfall patterns during past warm states: A proxy network-model comparison for the Last Interglacial and the mid-Holocene

2021 ◽  
Author(s):  
Cameron de Wet ◽  
Jessica Oster ◽  
Daniel Ibarra ◽  
Bryce Belanger
Keyword(s):  
North America ◽  
Pacific Northwest ◽  
Great Basin ◽  
North American ◽  
Last Interglacial ◽  
The North ◽  
Driving Mechanisms ◽  
Statistical Measures ◽  
Spatial Coverage ◽  
Rainfall Patterns

<p>The Last Interglacial (LIG) period (~129,000–116,000 years BP) and the mid-Holocene (MH) (~6,000 years BP) are the two most recent intervals with temperatures comparable to low emissions scenarios for the end of the 21<sup>st</sup> century. During the LIG and the MH differences in the seasonal and latitudinal distribution of insolation led to enhanced northern hemisphere high-latitude warmth relative to the pre-industrial, despite similar greenhouse gas concentrations, marking these intervals as potentially useful analogs for future change in regions like North America. Further, the inclusion of both LIG (127 ka) and MH (6 ka) experiments in the CMIP6-PMIP4 effort provides an opportunity to better understand the regional hydroclimate responses to radiative forcing during these two intervals. The dense coverage of paleoclimate proxy records for North America during the MH (N=260 sites) reveals a pattern of relative aridity in the Pacific Northwest and Western Canada and wetness in the southern Great Basin and Mexico. However, the seasonality and driving mechanisms of rainfall patterns across the continent remain poorly understood. Our understanding of terrestrial hydroclimate in North America during the LIG is more limited (N=39 sites), largely because the LIG is beyond the range of radiocarbon dating.</p><p>Here we present spatial comparisons between output from 14 PMIP4 global circulation models and LIG and MH networks of moisture-sensitive proxies compiled for the North American continent. We utilize two statistical measures of agreement – weighted Cohen’s Kappa and Gwet’s AC2 – to assess the degree of categorical agreement between moisture patterns produced by the models and the proxy networks for each time-slice. PMIP4 models produce variable precipitation anomalies relative to the pre-industrial for both the LIG and MH experiments, often disagreeing on both the sign and magnitude of precipitation changes across much of North America. The models showing the best agreement with the proxy network are similar but not identical for the two measures, with Gwet’s AC2 values tending to be larger than Cohen’s Kappa values for all models. This pattern is enhanced for the much larger MH proxy network and is likely related to the fact that Gwet’s AC2 is a more predictable statistic in the presence of high agreement. Overall agreement is lower for the mid-Holocene than for the LIG, reflecting smaller MH rainfall anomalies in the models. The models with the highest agreement scores during the LIG produce aridity in the Rocky Mountains and Pacific Northwest and wetness in Alaska, the Yukon, the Great Basin, and parts of the Mid-West and Eastern US, although spatial coverage of the proxies in these latter two regions is poor. The models with the highest agreement score for the mid-Holocene tend to produce aridity across Canada and the northern US with dry conditions extending down the US Pacific coast and increased wetness in the American Southeast and across the North American Monsoon region. Our analyses help elucidate the driving mechanisms of rainfall patterns during past warm states and can inform which models may be the most useful for predictions of near-future hydroclimate change across North America.</p>

scholarly journals Changes in precipitation regimes over North America during the Holocene as recorded by mineralogy and geochemistry of Gulf of Mexico sediments

2010 ◽  
Vol 74 (3-4) ◽  
pp. 132-143 ◽  
Author(s):  
Jean Carlos Montero-Serrano ◽  
Viviane Bout-Roumazeilles ◽  
Thomas Sionneau ◽  
Nicolas Tribovillard ◽  
Aloys Bory ◽  
...  
Keyword(s):  
North America ◽  
Gulf Of Mexico ◽  
The Holocene ◽  
Precipitation Regimes

Last interglacial (MIS 5e) and Holocene paleohydrology and paleovegetation of midcontinental North America from Gulf of Mexico sediments

2020 ◽  
Vol 227 ◽  
pp. 106066 ◽  
Author(s):  
Yeon Jee Suh ◽  
Aaron F. Diefendorf ◽  
Erika J. Freimuth ◽  
Sangmin Hyun
Keyword(s):  
North America ◽  
Gulf Of Mexico ◽  
Last Interglacial ◽  
Mis 5E

scholarly journals Last interglacial sea levels within the Gulf of Mexico and northwestern Caribbean Sea

2020 ◽  
Author(s):  
Alexander R. Simms
Keyword(s):  
Gulf Of Mexico ◽  
Sea Level ◽  
Mississippi River ◽  
Yucatan Peninsula ◽  
Vertical Motion ◽  
Future Research ◽  
Last Interglacial ◽  
Sea Levels ◽  
Northern Gulf Of Mexico ◽  
Yucatán Peninsula

Abstract. During the Last Interglacial (LIG) the volume of additional water in the world's oceans was large enough to raise global sea levels about 6–9 m higher than present levels. However, LIG sea levels vary regionally and those regional differences hold clues about the past distribution of ice sheets and local rates of subsidence and tectonic uplift. In this study, I used a standardized database template to review and summarize the existing constraints on LIG sea levels across the northern Gulf of Mexico and Caribbean shoreline of the Yucatan Peninsula. In total, I extracted 32 sea-level indicators including the insertion of 16 U-series ages on corals, 1 electron spin resonance age, 2 amino acid racemization ages and 26 luminescence ages. Most dated sea-level indicators for the northern Gulf of Mexico are based on optically stimulated luminescence (OSL) ages of beach deposits of a mappable LIG shoreline. This shoreline extends from the Florida Panhandle through south Texas but is buried or removed by the Mississippi River across most of Louisiana. A similar feature is observed in satellite images south of the Rio Grande within the Mexican portions of the Gulf of Mexico but has yet to be dated. Elevations measured on portions of this feature close to the modern coast point to sea levels less than 1 m to ~ 5 m higher than present for much of the northern Gulf of Mexico. However, a few, albeit undated, portions of the same shoreline located at more inland locations point to sea levels up to +7.2 m attesting to up to 7 m of differential subsidence between the inland and coastal sites. Across the Yucatan Peninsula, U-series dating of corals has provided the main index points for LIG sea levels. Other carbonate coastal features such as beach ridges and eolianites have also been described, but rely on corals for their dating. The maximum elevation of the LIG coral-based relative sea-level (RSL) estimates decrease from around +6 m across the Caribbean shoreline of the Yucatan Peninsula near Cancun, Mexico to as low as −6 m to the south beneath the southern atolls of Belize, although discussion continues as to the validity of the ages for these southern corals. If these lower elevations corals are LIG in age, their below-present elevations may be a result of vertical motion along faults dipping into the Cayman Trough. South of Belize only one purported LIG coral has been dated on the Isla de Roatán off the coast of Honduras at a likely tectonically uplifted elevation of 37.2 m. Thus the elevation of LIG sea levels within the inland siliciclastic shorelines of Guatemala and Honduras as well as the southwestern Gulf of Mexico remain poorly constrained and potential venues for future research. The database described in this paper is available open-access in spreadsheet format as Simms (2020), at this link: https://doi.org/10.5281/zenodo.4002200.

scholarly journals Marine evidence for episodic Holocene megafloods in North America and the northern Gulf of Mexico

1999 ◽  
Vol 14 (4) ◽  
pp. 498-510 ◽  
Author(s):  
Paul Brown ◽  
James P. Kennett ◽  
B. Lynn Ingram
Keyword(s):  
North America ◽  
Gulf Of Mexico ◽  
Northern Gulf Of Mexico

scholarly journals Last interglacial sea levels within the Gulf of Mexico and northwestern Caribbean Sea

2021 ◽  
Vol 13 (3) ◽  
pp. 1419-1439
Author(s):  
Alexander R. Simms
Keyword(s):  
Gulf Of Mexico ◽  
Sea Level ◽  
Mississippi River ◽  
Yucatan Peninsula ◽  
Vertical Motion ◽  
Future Research ◽  
Last Interglacial ◽  
Sea Levels ◽  
Northern Gulf Of Mexico ◽  
Yucatán Peninsula

Abstract. During the last interglacial (LIG) the volume of additional water in the world's oceans was large enough to raise global sea levels about 6–9 m higher than present levels. However, LIG sea levels vary regionally and those regional differences hold clues about the past distribution of ice sheets and local rates of subsidence and tectonic uplift. In this study, I used a standardized database template to review and summarize the existing constraints on LIG sea levels across the northern Gulf of Mexico and Caribbean shoreline of the Yucatán Peninsula. In total, I extracted 32 sea-level indicators including the insertion of 16 U-series ages on corals, 1 electron spin resonance age, 2 amino acid racemization ages, and 26 luminescence ages. Most dated sea-level indicators for the northern Gulf of Mexico are based on optically stimulated luminescence (OSL) ages of beach deposits of a mappable LIG shoreline. This shoreline extends from the Florida Panhandle through south Texas but is buried or removed by the Mississippi River across most of Louisiana. A similar feature is observed in satellite images south of the Rio Grande within the Mexican portions of the Gulf of Mexico but has yet to be dated. Elevations measured on portions of this feature close to the modern coast point to sea levels less than 1 m to ∼5 m higher than present for much of the northern Gulf of Mexico. However, a few, albeit undated, portions of the same shoreline located at more inland locations point to sea levels up to +7.2 m, attesting to up to 7 m of differential subsidence between the inland and coastal sites. Across the Yucatán Peninsula, U-series dating of corals has provided the main index points for LIG sea levels. Other carbonate coastal features such as beach ridges and eolianites have also been described but rely on corals for their dating. The maximum elevation of the LIG coral-based relative sea-level (RSL) estimates decrease from around +6 m across the Caribbean shoreline of the Yucatán Peninsula near Cancún, Mexico, to as low as −6 m to the south beneath the southern atolls of Belize, although discussion continues as to the validity of the ages for these southern corals. If these lower-elevation corals are LIG in age, their below-present elevations may be a result of vertical motion along faults dipping into the Cayman Trough. South of Belize only one purported LIG coral has been dated on the Isla de Roatán off the coast of Honduras at a likely tectonically uplifted elevation of 37.2 m. Thus the elevation of LIG sea levels within the inland siliciclastic shorelines of Guatemala and Honduras as well as the southwestern Gulf of Mexico remains poorly constrained and a potential venue for future research. The database described in this paper is available open access in spreadsheet format as Simms (2020), at this link: https://doi.org/10.5281/zenodo.4556163.

Effects of hypoxia on habitat quality of pelagic planktivorous fishes in the northern Gulf of Mexico

2014 ◽  
Vol 505 ◽  
pp. 209-226 ◽  
Author(s):  
H Zhang ◽  
DM Mason ◽  
CA Stow ◽  
AT Adamack ◽  
SB Brandt ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Habitat Quality ◽  
Northern Gulf Of Mexico
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