Items where Author is "Willems, Helmut"

Zhang, Q, Wendler, I, Xu, X, Willems, H and Ding, L (2017) Structure and magnitude of the carbon isotope excursion during the Paleocene-Eocene thermal maximum. Gondwana Research, 46. 114-123. doi:10.1016/j.gr.2017.02.016

Heinrich, S, Zonneveld, KAF, Bickert, T and Willems, H (2011) The Benguela upwelling related to the Miocene cooling events and the development of the Antarctic Circumpolar Current: evidence from calcareous dinoflagellate cysts. Paleoceanography, 26. PA3209. doi:10.1029/2010PA002065

Lüer, V, Cortese, G, Neil, HL, Hollis, C and Willems, H (2009) Radiolarian-based sea surface temperatures and paleoceanographic changes during the Late Pleistocene-Holocene in the subantarctic southwest Pacific. Marine Micropaleontology, 70(3-4). 151-165. doi:10.1016/j.marmicro.2008.12.002

Elbrächter, M, Gottschling, M, Hildebrand-Habel, T, Keupp, H, Kohring, R, Lewis, J, Meier, KJS, Montresor, M, Streng, M, Versteegh, GJM, Willems, H and Zonneveld, KAF (2008) Establishing an Agenda for Calcareous Dinoflagellate Research (Thoracosphaeraceae, Dinophyceae) including a Nomenclatural Synopsis of Generic Names. Taxon, 57(4). 1289-1303. http://www.jstor.org/stable/27756780

Richter, D, Vink, A, Zonneveld, KAF, Kuhlmann, H and Willems, H (2007) Calcareous dinoflagellate cyst distributions in surface sediments from upwelling areas off NW Africa, and their relationships with environmental parameters of the upper water column. Marine Micropaleontology, 63(3-4). 210-228. doi:10.1016/j.marmicro.2006.12.002

Bison, KM, Versteegh, GJM, Hilgen, FJ and Willems, H (2007) Calcareous dinoflagellate turnover in relation to the Messinian salinity crisis in the Eastern Mediterranean Pissouri Basin; Cyprus. Journal of Micropalaeontology, 26. 103-116. doi:10.1144/jm.26.2.103

Susek, E, Zonneveld, KAF, Fischer, G, Versteegh, GJM and Willems, H (2005) Organic-walled dinoflagellate cysts production in relation to upwelling intensity and lithogenic influx in the Cape Blanc region (off north-west Africa). Phycological Journal, 53(2). 97-112. doi:10.1111/j.440-183.2005.00377

Meier, KJS, Zonneveld, KAF, Kasten, S and Willems, H (2004) Different nutrient sources forcing increased productivity during eastern Mediterranean S1 sapropel formation as reflected by calcareous dinoflagellate cysts. Paleoceanography, 19. PA1012. doi:10.1029/2003PA000895

Bison, KM, Wendler, J, Versteegh, GJM and Willems, H (2004) Tetratropis terrina sp. nov., a new calcareous dinoflagellate cyst from the Upper Campanian polyplocum zone of Lägerdorf, (NW Germany). Journal of Micropalaeontology, 23(2). 127.132.

Esper, O, Versteegh, GJM, Zonneveld, KAF and Willems, H (2004) A palynological reconstruction of the Agulhas Retroflection (South Atlantic Ocean) during the Late Quaternary. Global and Planetary Change, 41. 31-62. doi:10.1016/j.gloplacha.2003.10.002

Vink, A, Baumann, KH, Boeckel, B, Esper, O, Kinkel, H, Volbers, ANA, Willems, H and Zonneveld, KAF (2003) Coccolithophorid and dinoflagellate synecology in the South and Equatorial Atlantic: Improving the palaeoecological significance of phytoplanktonic microfossils. In: Wefer, G, Mulitza, S and Ratmeyer, V (eds.) The South Atlantic in the Late Quaternary: Reconstruction of Material Budgets and Current Systems. Springer, Berlin, Heidelberg, New York, 101-120. doi:10.1007/978-3-642-18917-3_6

Vink, A, Brune, A, Höll, C, Zonneveld, KAF and Willems, H (2002) On the response of calcareous dinoflagellates to oligotrophy and stratification of the water column in the equatorial Atlantic Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology, 178(1-2). 53-66. doi:10.1016/S0031-0182(01)00368-6

Zonneveld, KAF, Hoek, RP, Brinkhuis, H and Willems, H (2001) Geographical distributions of organic-walled dinoflagellate cysts in surficial sediments of the Benguela upwelling region and their relationship to upper ocean conditions. Progress in Oceanography, 48(1). 25-72. doi:10.1016/S0079-6611(00)00047-1

Vink, A, Rühlemann, C, Zonneveld, KAF, Mulitza, S, Hüls, M and Willems, H (2001) Shifts in the Position of the North Equatorial Current and Rapid Productivity Changes in the western Tropical Atlantic during the Last Glacial. Paleoceanography, 16(5). 479-490. doi:10.1029/2000PA000582

Willems, H, Bleil, U, Henrich, R, Herterich, K, Jørgensen, BB, Kuß, HJ, Olesch, M, Schulz, HD, Spieß, V and Wefer, G (2000) Abschlußbericht des Graduierten-Kollegs Stoff-Flüsse in marinen Geosystemen. Zusammenfassung und Berichtszeitraum Januar 1996 - Dezember 2000. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 160. Department of Geosciences, Bremen University. urn:nbn:de:gbv:46-ep000102807

Willems, H and et al (1995) Bericht des Graduierten-Kollegs Stoff-Flüsse in marine Geosystemen. Berichtszeitraum Januar 1993 - Dezember 1995. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 069. Department of Geosciences, Bremen University. urn:nbn:de:gbv:46-ep000102026

Willems, H and et al (1995) The Mesozoic development of the N-Indian passive margin and of the Xigaze Forearc Basin in southern Tibet, China. - Excursion Guide to IGCP 362 Working-Group Meeting Integrated Stratigraphy. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 064. Department of Geosciences, Bremen University. urn:nbn:de:gbv:46-00101686-19

Willems, H (1993) Geoscientific Investigations in the Tethyan Himalayas. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 038. Department of Geosciences, Bremen University. urn:nbn:de:gbv:46-ep000101760

Willems, H and et al (1990) Beiträge zur Geologie und Paläontologie Norddeutschlands: Exkursionsführer. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 010. Department of Geosciences, Bremen University. urn:nbn:de:gbv:46-ep000101526