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To address this issue, diatoms and organic carbon were examined across Heinrich event 1 (HE 1) and Heinrich event 4 (HE 4) in seven sediment cores spanning 40\u00b0N to 63\u00b0N latitude. Our results show low diatom abundances during HEs, consistent with decreased surface water productivity. Diatom dilution by increased sediment flux was tested by normalizing diatom abundance to a constant <jats:sup>230<\/jats:sup>Th flux. Although the particle rain rate was enhanced during HEs, this does not explain the sharp drop in diatoms. During HE 4, surface productivity decreased at all latitudes examined, probably because of strong, year\u2010round stratification. The same inferred changes occurred during HE 1 within the area of maximum iceberg melting. However, at northern latitudes (above 50\u00b0N) the summer insolation increase of the glacial termination drove increased surface productivity during the whole period, including HE 1. Marine organic carbon, taken as independent proxy for export production, supports the diatom data. Trends shown by the productivity proxies evolve generally in parallel with the hydrographic proxies, with an increase in productivity when sea surface temperature increases.<\/jats:p>","DOI":"10.1029\/2006pa001335","type":"journal-article","created":{"date-parts":[[2007,9,13]],"date-time":"2007-09-13T20:00:43Z","timestamp":1189713643000},"source":"Crossref","is-referenced-by-count":33,"title":["Primary productivity response to Heinrich events in the North Atlantic Ocean and Norwegian Sea"],"prefix":"10.1029","volume":"22","author":[{"given":"S.","family":"Nave","sequence":"first","affiliation":[{"name":"Departamento de Geologia Marinha Instituto Nacional de Engenharia, Tecnologia e Inova\u00e7\u00e3o  Alfragide Portugal"}]},{"given":"L.","family":"Labeyrie","sequence":"additional","affiliation":[{"name":"Laboratoire des Sciences du Climat et de l'Environnement CEA\/CNRS\/UVSQ  Gif\u2010sur\u2010Yvette France"}]},{"given":"J.","family":"Gherardi","sequence":"additional","affiliation":[{"name":"Laboratoire des Sciences du Climat et de l'Environnement CEA\/CNRS\/UVSQ  Gif\u2010sur\u2010Yvette France"}]},{"given":"N.","family":"Caillon","sequence":"additional","affiliation":[{"name":"Laboratoire des Sciences du Climat et de l'Environnement CEA\/CNRS\/UVSQ  Gif\u2010sur\u2010Yvette France"}]},{"given":"E.","family":"Cortijo","sequence":"additional","affiliation":[{"name":"Laboratoire des Sciences du Climat et de l'Environnement CEA\/CNRS\/UVSQ  Gif\u2010sur\u2010Yvette France"}]},{"given":"C.","family":"Kissel","sequence":"additional","affiliation":[{"name":"Laboratoire des Sciences du Climat et de l'Environnement CEA\/CNRS\/UVSQ  Gif\u2010sur\u2010Yvette France"}]},{"given":"F.","family":"Abrantes","sequence":"additional","affiliation":[{"name":"Departamento de Geologia Marinha Instituto Nacional de Engenharia, Tecnologia e Inova\u00e7\u00e3o  Alfragide Portugal"}]}],"member":"13","published-online":{"date-parts":[[2007,9,14]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0012-821X(99)00312-X"},{"key":"e_1_2_9_3_1","first-page":"97","article-title":"Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements","volume":"2","author":"Bacon M. 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