Author: Johan EtourneauPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Pliocene-pleistocene Variability of Upwelling Activity, Productivity and Nutrient Cycle in the Benguela Upwelling System and the Eastern Equatorial Pacific
Author: Johan EtourneauPlio-Pleistocene Nutrient Dynamics and Export Productivity in the California and Benguela Current Upwelling Systems
Author: Rebecca Sprague RobinsonPublisher:
ISBN:
Category :
Languages : en
Pages : 354
Book Description
Quaternary Productivity Records from the Eastern Equatorial Atlantic and the Benguela Upwelling System
Author: María Elena PérezPaleoproductivity Variations in the Eastern Central Equatorial Pacific Ocean on Glacial Timescales
Author: Publisher:
ISBN:
Category : Biological productivity
Languages : en
Pages : 330
Book Description
Paleoproductivity records during the late Pleistocene are sparse. The equatorial Pacific and the Southern Ocean are collectively responsible for the majority of the new production in the oceans. The nutrient and carbon mass balances of these regions must be constrained in order to fully understand net global biological productivity on glacial timescales. The geochemistry of two east-central equatorial Pacific Ocean cores (02° 33.48 N; 117° 55.06 W) and (00° 15.42 S; 113° 00.57 W) are used to examine changes in biological productivity due to nutrient upwelling on glacial timescales during the Pleistocene. The cores were recovered in March 2006 on the AMAT03 cruise, a site survey cruise for IODP Proposal 626. The total concentrations of Ca, Ti, Fe, Al, P, Ba, S, Mg, Sr, Zn and Mn were determined by a total sediment digestion followed by analysis by inductively coupled plasma-atomic emission spectrometry (ICP). Original solid forms of P for 34 evenly spaced samples throughout one core were determined using the P Sequential Extraction technique. This study is attempting to compare upwelling and productivity records by determining temporal records of nutrient proxies, using Latimer and Filippelli (2006) which focused on the Southern Ocean. Equatorial upwelling and Southern Ocean upwelling both appear to exhibit strong glacial timescale variability. The P geochemistry results indicate that the P signal is largely biological. The equatorial Pacific evidence, in accordance with Southern Ocean patterns, supports a nutrient budget-driven productivity signal over time.
Pliocene-Pleistocene Evolution of Benguela Upwelling and Agulhas Leakage in the SE Atlantic
Author: Benjamin Fredericks PetrickPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Pleistocene Nutrient, Thermocline, and Bottom Current Dynamics in the South Pacific Sector of the Western Pacific Warm Pool
Author: Jonathan Edward LambertPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
I also identify a period between 100 and 60 ka during a potential reorganization of the upper water column in which variability in productivity occurs at a higher frequency than that of precession. Finally, while also related to ITCZ shifts, a nearby record closer to the equator is phase-lagged from Site U1486 - emphasizing the fine-scale regional differences in the drivers of primary productivity in the WPWP.
A Dual-proxy Reconstruction of Latest Pleistocene Upwelling in the Benguela Current System
Author: Robert J. SchenckPublisher:
ISBN: 9781109825480
Category : Atmospheric circulation
Languages : en
Pages : 104
Book Description
The goal of this project was to evaluate latest Pleistocene upwelling history for the Benguela Current System using species abundance data (Neoglobogerina pachyderma and others) and seawater temperature estimates from Globigerina bulloides Mg/Ca.
The Interactions Between Hydrography, Productivity and Chemical Variability in the Northern Benguela Upwelling System
Author: Oliver AtkinsonCharacterizing Upwelling Regions and the Indo-Pacific Warm Pool in the Early Pliocene Warm Period
Author: Petra Simonne DekensPublisher:
ISBN:
Category :
Languages : en
Pages : 292
Book Description
Pliocene-Pleistocene Evolution of Tropical Aridity
Author: Peter Bedloe DeMenocalPublisher:
ISBN:
Category : Paleoclimatology
Languages : en
Pages : 278
Book Description