Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Hovan, Steven A (1995): Late Cenozoic eolian dust accumulation in the eastern equatorial Pacific Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.807836, Supplement to: Hovan, SA (1995): Late Cenozoic atmospheric circulation intensity and climatic history recorded by eolian deposition in the eastern Equatorial Pacific Ocean, Leg 138. In: Pisias, NG; Mayer, LA; Janecek, TR; Palmer-Julson, A; van Andel, TH (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 138, 615-625, https://doi.org/10.2973/odp.proc.sr.138.132.1995

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
Sediments recovered during Ocean Drilling Program (ODP) Leg 138 in the eastern equatorial Pacific Ocean were analyzed for variations in eolian accumulation rate and mean grain-size. Latitudinal and temporal patterns of these parameters showed important changes in the intensity of atmospheric circulation and eolian flux associated with the intertropical convergence zone (ITCZ) and suggested that eolian input parameters could be used to define its paleoposition through time. Modern atmospheric circulation in the equatorial region is weakest in the intertropical convergence zone and increases as the trade winds are approached to the north and south. Thus, the expected spatial pattern of eolian grain size would have the finest material deposited beneath the ITCZ and a coarsening of material in both directions away from this zone. Sediments from ODP Leg 138 show this pattern for much of the Pleistocene and Pliocene but, prior to about 4 Ma, begin to lose the northern coarse component suggesting that the ITCZ was located north of its present position during the late Miocene. Eolian flux records also show a latitudinal pattern of deposition associated with the position of the ITCZ that, similar to eolian grain-size variability, suggests a more northerly position of the ITCZ during the late Miocene. Overall, the regional input of eolian material to the equatorial Pacific has decreased throughout the late Neogene. This reduction in eolian input reflects climatic changes to relatively wetter conditions in the continental eolian source regions beginning during the late Pliocene.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 2.423230 * Median Longitude: -110.206818 * South-bound Latitude: -2.993900 * West-bound Longitude: -110.519710 * North-bound Latitude: 7.211010 * East-bound Longitude: -109.751400
Date/Time Start: 1991-06-04T15:35:00 * Date/Time End: 1991-06-25T21:25:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Hovan, SA (2013): (Table 1) Grain-size variations, eolian material and accumulation rates in sediments from ODP Hole 138-848B. https://doi.org/10.1594/PANGAEA.807832
  2. Hovan, SA (2013): (Table 2) Grain-size variations, eolian material and accumulation rates in sediments from ODP Hole 138-849B. https://doi.org/10.1594/PANGAEA.807833
  3. Hovan, SA (2013): (Table 3) Grain-size variations, eolian material and accumulation rates in sediments from ODP Hole 138-852B. https://doi.org/10.1594/PANGAEA.807834
  4. Hovan, SA (2013): (Table 4) Grain-size variations, eolian material and accumulation rates in sediments from ODP Hole 138-853B. https://doi.org/10.1594/PANGAEA.807835