English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. suggest millennial scale climate variability is a component of earth's climate system during the last interglacial period (marine oxygen isotope stage 5). The USGS is involved in a survey of high resolution marine records covering the last interglacial period (MIS 5) to further document the variability of climate and assess the rate at which climate can change during warm intervals. The Gulf of Mexico (GOM) is an attractive area for analysis of climate variability and rapid change. Changes in the Mississippi River Basin presumably are translated to the GOM via the river and its effect on sediment distribution and type. Likewise, the summer monsoon in the southwestern US is driven by strong southerly winds. These winds may produce upwelling in the GOM which will be recorded in the sedimentary record. Several areas of high accumulation rate have been identified in the GOM. Ocean Drilling Program (OOP) Site 625 appears to meet the criteria of having a well preserved carbonate record and accumulation rate capable of discerning millennial scale changes. It is not cost effective to analyze high resolution (=high accumulation rate) MIS 5 sequences in the frequency domain using traditional paleoclimate proxies (e.g., total faunal analysis, stable isotopes). In orderto discriminate events on millennial and sub-millennial scales, sample spacing needs to be on the order of 200-300 years. Given the duration of MIS 5 of-60,000 years, a sample spacing of 300 years would require 200 time-intensive faunal analyses. Instead, we have developed a strategy which uses initial analysis of physical properties measurements to document the variability of sequences. This in turn allows us to target specific portions of sequences using fewer total faunal and stable isotopic analyses. Physical properties measurements are routinely available for most later OOP Legs but are not available for Leg 100 (ODP625). This report documents the development of a sediment color and reflectance record for the MIS 5 interval of OOP Hole 625B in the northeastern Gulf of Mexico and analyzes that record in the frequency domain. OOP Site 625 was drilled in 1985 during a shakedown cruise of the JOIDES Resolution. A 5.35 m.y.-planktonic stable isotope record was developed …

Sediment color and reflectance record from Ocean Drilling Program Hole 625B, Gulf of Mexico (marine isotope stage 5 interval)