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Dive into the research topics where Timothé Bolliet is active.

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Featured researches published by Timothé Bolliet.


Geophysical Research Letters | 2008

A mid-Holocene transition in the nitrogen dynamics of the western equatorial Pacific: Evidence of a deepening thermocline?

Markus Kienast; Moritz F. Lehmann; Axel Timmermann; Eric D. Galbraith; Timothé Bolliet; Ann Holbourn; C. Normandeau; Carlo Laj

Sedimentary delta(15)N records from the oligotrophic western equatorial Pacific (WEP) off Mindanao show that late Holocene sedimentary delta(15)N is substantially lower than that of the early Holocene, following a gradual >3 parts per thousand decrease that occurred between 7 and 3 kyrs ago. Analyses of modem day nitrate isotope profiles from the same region indicate the sensitivity of the WEP N pools towards (1) the advection of (15)N-enriched nitrate from the Eastern Equatorial Pacific (EEP) by the North Equatorial Current (NEC) and the Mindanao Current in subsurface waters and, (2) at shallow depths, the input of new and (15)N-depleted nitrate through N, fixation. We suggest that the Holocene decrease in sedimentary delta(15)N reflects a diminished relative input of (15)N-enriched nitrate to the surface biota, either through an increase of regional nitrogen fixation, a change in nitrate consumption along the advective path of nitrate supply, or a decrease in the vertical Supply Of (15)N-enriched nitrate from the NEC. The latter mechanism is consistent with a Holocene deepening of the WEP nitracline/thermocline. Citation: Kienast, M., M. F. Lehmann, A. Timmermann, E. Galbraith, T. Bolliet, A. Holboum, C. Normandeau, and C. Laj (2008), A mid-Holocene transition in the nitrogen dynamics of the western equatorial Pacific: Evidence of a deepening thermocline?, Geophys. Res. Lett,, 35, L23610, doi: 10.1029/2008GL035464.


Paleoceanography | 2010

Monsoon variability and deep oceanic circulation in the western equatorial Pacific over the last climatic cycle: Insights from sedimentary magnetic properties and sortable silt

Catherine Kissel; Carlo Laj; Markus Kienast; Timothé Bolliet; Ann Holbourn; Paul S. Hill; Wolfgang Kuhnt; Pascale Braconnot

Magnetic and grain size properties of a sediment core located in the western equatorial Pacific, off the southeastern tip of the Philippine island of Mindanao, are presented in an effort to reconstruct past changes in the East Asian Monsoon and deep ocean circulation during the last 160 kyrs. The sedimentary concentration of magnetic particles, interpreted to reflect past changes in runoff from Mindanao, varies almost in antiphase with Northern Hemisphere insolation. This suggests that precipitation was lower in the western equatorial Pacific region during boreal insolation maxima and thus corroborates model results showing opposing trends in precipitation between land and the marine realm there. Variations in the grain size distribution of the inorganic sediment fraction, as recorded by both the sortable silt mean size and the magnetic grain size, provide a monitor of changes in sediment reworking by bottom currents. The close correlation of this proxy of bottom current strength and the benthic delta(18)O record from the same site implies a tight coupling between deep water flow, most likely Antarctic Intermediate Water (AAIW), and global climate.


Paleoceanography | 2011

Mindanao Dome variability over the last 160 kyr: Episodic glacial cooling of the West Pacific Warm Pool

Timothé Bolliet; Ann Holbourn; Wolfgang Kuhnt; Carlo Laj; Catherine Kissel; Luc Beaufort; Markus Kienast; Nils Andersen; Dieter Garbe-Schönberg


Chinese Science Bulletin | 2011

A palynological and palaeoclimatological record from the southern Philippines since the Last Glacial Maximum

YePing Bian; Zhimin Jian; ChengYu Weng; Wolfgang Kuhnt; Timothé Bolliet; Ann Holbourn


Supplement to: Fraser, N et al. (2014): Precipitation variability within the West Pacific Warm Pool over the past 120 ka: evidence from the Davao Gulf, southern Philippines. Paleoceanography, 29(11), 1094-1110, https://doi.org/10.1002/2013PA002599 | 2014

Stable oxygen isotope, UK'37, productivity, CaCO3 and XRF records from sediment core MD06-3075

Nicholas Fraser; Wolfgang Kuhnt; Ann Holbourn; Timothé Bolliet; Nils Andersen; Thomas Blanz; Luc Beaufort


In supplement to: Fraser, N et al. (2014): Precipitation variability within the West Pacific Warm Pool over the past 120 ka: evidence from the Davao Gulf, southern Philippines. Paleoceanography, 29(11), 1094-1110, https://doi.org/10.1002/2013PA002599 | 2014

Elemental composition of sediment core MD06-3075

Nicholas Fraser; Wolfgang Kuhnt; Ann Holbourn; Timothé Bolliet; Nils Andersen; Thomas Blanz; Luc Beaufort


In supplement to: Fraser, N et al. (2014): Precipitation variability within the West Pacific Warm Pool over the past 120?ka: evidence from the Davao Gulf, southern Philippines. Paleoceanography, 29(11), 1094-1110, https://doi.org/10.1002/2013PA002599 | 2014

Stable oxygen isotope record of benthic foraminifera from sediment core MD06-3075

Nicholas Fraser; Wolfgang Kuhnt; Ann Holbourn; Timothé Bolliet; Nils Andersen; Thomas Blanz; Luc Beaufort


SAGE 2013 | 2013

Tropical convection variability in the West Pacific Warm Pool since the Last Glacial Maximum

Nicholas Fraser; Timothé Bolliet; Ann Holbourn; Wolfgang Kuhnt


AGU Fall Meeting 2012 | 2012

Tropical convection variability in the West Pacific Warm Pool over the past 120kyr

Nicholas Fraser; Timothé Bolliet; Ann Holbourn; Wolfgang Kuhnt


Supplement to: Bolliet, T et al. (2011): Mindanao Dome variability over the last 160 kyr: Episodic glacial cooling of the West Pacific Warm Pool. Paleoceanography, 26, PA1208, https://doi.org/10.1029/2010PA001966 | 2011

Stable isotope record, Mg/Ca ratios and sea surface reconstruction for sediment core MD06-3067

Timothé Bolliet; Ann Holbourn; Wolfgang Kuhnt; Carlo Laj; Catherine Kissel; Luc Beaufort; Markus Kienast; Nils Andersen; Carl-Dieter Garbe-Schönberg

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Carlo Laj

Centre national de la recherche scientifique

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Luc Beaufort

Aix-Marseille University

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