Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM

The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to lower latitudes associated with the Atlantic meridional overturning circulation reaches down to approximately 4,000 m. In contrast, during the Last Glacial Maximum this return flow is thought to have occurred primarily at shallower depths. Measurements of sedimentary 231Pa/230Th have been used to reconstruct the strength of circulation in the North Atlantic Ocean, but the effects of biogenic silica on 231Pa/230Th-based estimates remain controversial. Here we use measurements of 231Pa/230Th ratios and biogenic silica in Holocene-aged Atlantic sediments and simulations with a two-dimensional scavenging model to demonstrate that the geometry and strength of the Atlantic meridional overturning circulation are the primary controls of 231Pa/230Th ratios in modern Atlantic sediments. For the glacial maximum, a simulation of Atlantic overturning with a shallow, but vigorous circulation and bulk water transport at around 2,000 m depth best matched observed glacial Atlantic 231Pa/230Th values. We estimate that the transport of intermediate water during the Last Glacial Maximum was at least as strong as deep water transport today.

Fuga, op. 152,

Mode of access: Internet.

Laboratory outline for Medical entomology (Entomology 152).

Includes bibliographies.

Logique, ontologie et théologie au XIVe siècle : preuve et raisons à l'Université de Paris : actes de la Table Ronde internationale organisée par le Laboratoire associé au C.N.R.S. no. 152 du 5 ̲au 7 novembre 1981.

Mode of access: Internet.

Cook County, Illinois, School District No. 152.5 : financial statements.

"Pursuant to the requirement of 105 ILCS 5/ IE-130 and IF-130 of the Illinois School Code, enclosed is the School Finance Authority's Annual Report for the Round Lake Area Schools -- District 116 and Hazel Crest School District 152.5 along with copies of the audited financial statements for fiscal year ending June 30, 2003."--Memorandum.

Artigo extrahido da gazeta de Lisboa n.o 152 sobre o effeito que o manifesto de el rei nosso senhor, o Senhor Dom Miguel I., causou nos diversos reinos estrangeiros.

Mode of access: Internet.

San Gimignano; con 152 illustrazioni e 1 tavola.

Mode of access: Internet.