Zeynep ErdemNIOZ Royal Netherlands Institute for Sea Research | NIOZ · Department of Marine Organic Biogeochemistry (BGC)
Zeynep Erdem
PhD
Postdoctoral research in NIOZ working with marine sediment cores from upwelling regions to reconstruct past N-cycling
About
81
Publications
10,289
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424
Citations
Introduction
I am paleoceanographer with special interest in oxygen minimum marine settings. I work with marine records with particular focus on the last 25k years. I am interested in reconstructing the past dynamics of upwelling systems where we see strong oxygen minimum conditions as well, such as Eastern Pacific and the Arabian Sea. I use various proxies and tools to investigate the past conditions from these regions;
* benthic foraminifera taxonomy,
* isotope geochemistry (both benthic and planktonic foraminifera)
* lipid biomarkers
* nitrogen isotopes
Additional affiliations
August 2016 - August 2019
Position
- PostDoc Position
Description
- ERC project DIOLS
July 2012 - June 2016
Position
- SFB754 - B7: Reconstruction of past oxygenation and redox conditions
May 2010 - May 2013
Education
October 2012 - June 2016
September 2008 - May 2011
Istanbul Technivcal University
Field of study
- Climate and Ocean
September 2004 - August 2008
Publications
Publications (81)
Upwelling regions are dynamic systems where relatively cold, nutrient- and CO2-rich waters reach to the surface from the deep. CO2 sink or source properties of these regions are dependent not only on the dissolved inorganic carbon content of the upwelled waters, but also on the efficiency of the biological carbon pump that provides constraint on th...
![Summed C18[5]-, C18[3]-, C20[5]-, and C20[3]-ladderane (orange) and...](publication/379178705/figure/fig3/AS:11431281278749280@1726759280525/Summed-C185-C183-C205-and-C203-ladderane-orange-and-summed-short-chain_Q320.jpg)
The California Current system (CCS) hosts one of the largest oxygen minimum zones (OMZs) in the world: the eastern North Pacific (ENP) OMZ, which is dissociated into subtropical and tropical regions (i.e. the ESTNP and ETNP). In the modern ENP OMZ, bioavailable nitrogen (N) is lost via denitrification and anaerobic ammonium oxidation (anammox). Eve...
A growing body of observations reveals rapid changes in both the total inventory and distribution of marine oxygen over the later half of the 21st century, leading to increased interest in extending oxygenation records into the past. Use of paleo-oxygen proxies have the potential to extend the spatial and temporal range of current records, bound pr...
The California current system (CCS) hosts one of the largest oxygen minimum zones (OMZs) in the world: the Eastern North Pacific (ENP) OMZ, which is dissociated into a subtropical and tropical region (i.e., the ESTNP and ETNP). In the modern ENP OMZ, bioavailable nitrogen (N) is lost via denitrification and anaerobic ammonium oxidation (anammox). E...
![Paleorecord of bottom water O2 concentrations ([O2]BW) at the Southern...](publication/366020992/figure/fig5/AS:11431281104916023@1670299484807/Paleorecord-of-bottom-water-O2-concentrations-O2BW-at-the-Southern-Peruvian_Q320.jpg)
Quantifying past oxygen concentrations in oceans is crucial to improving understanding of current global ocean deoxygenation. Here, we use a record of pore density of the epibenthic foraminifer Planulina limbata from the Peruvian Oxygen Minimum Zone to reconstruct oxygen concentrations in bottom waters from the Last Glacial Maximum to the Late Holo...
Long chain alkyl diols (LCDs) are lipid biomarkers that occur ubiquitously in sediments. Their abundance and distributions are increasingly used as the basis of molecular proxies for environmental parameters such as sea surface temperature (SST) via the Long chain Diol Index (LDI), and upwelling intensity and nutrient conditions (parametrized as di...
The long‐chain diol index (LDI) is a relatively new proxy for sea surface temperature (SST) which has been rarely applied in upwelling regions. Here, we evaluated its application by comparison with other SST records obtained by commonly used proxies, that is, the Mg/Ca ratio of the planktonic foraminifera species Globigerinoides ruber and the alken...
The Bosphorus (Istanbul Strait) is natural strait that connects the Black Sea with the Aegean Sea via the Sea of Marmara and Dardanelles Strait. It is a 31 km long and 3.5 km wide winding channel, with an irregular bottom morphology. It has depressions up to -110 m deep, and two sills with depths of -35 and -58 m in the south and north, respectivel...
The long-chain diol index (LDI) is a relatively new proxy for sea surface temperature (SST) which has been rarely applied in upwelling regions. Here, we evaluated its application by comparison with other SST records obtained by commonly used proxies, i.e. the Mg/Ca ratio of the planktonic foraminifera species Globigerinoides ruber and the alkenone...
Deciphering the dynamics of dissolved oxygen in the mid-depth ocean during the last deglaciation is essential to understand the influence of climate change on modern oxygen minimum zones (OMZs). Many paleo-proxy records from the eastern Pacific Ocean indicate an extension of oxygen-depleted conditions during the deglaciation, but the degree of deox...
Long-chain diols (LCDs) are ubiquitous lipids produced by freshwater and marine algae. A combination of semi-preparative high performance liquid chromatography and gas chromatography isotope ratio monitoring mass spectrometry, allowed the measurement of δ2H of individual LCDs from cultures, which indicated a correlation with the hydrogen isotope co...
Deciphering the dynamics of dissolved oxygen in the mid-depth ocean during the last deglaciation is essential to understand the influence of climate change on modern oxygen minimum zones (OMZs). Many paleo-proxy records from the Eastern Pacific Ocean indicate an extension of oxygen depleted conditions during the deglaciation but the degree of deoxy...
![Model simulations of [NO3⁻]-δ¹³CDIC coupling in the intermediate...](publication/323967658/figure/fig3/AS:958859933917187@1605621431689/Model-simulations-of-NO3-dCDIC-coupling-in-the-intermediate-Pacific-for-different_Q320.jpg)
Anthropogenic impacts are perturbing the global nitrogen cycle via warming effects and pollutant sources such as chemical fertilizers and burning of fossil fuels. Understanding controls on past nitrogen inventories might improve predictions for future global biogeochemical cycling. Here we show the quantitative reconstruction of deglacial bottom wa...
The benthic foraminiferal inventory and their assemblage composition was documented along five sediment cores from the Peruvian margin between 3°S and 18°S at water depths of 500 to 1250 m, covering the lower boundary of today’s Oxygen Minimum Zone (OMZ). Emphasis was given to certain time intervals during the last 22 thousand years when different...
New records of stable silicon isotope signatures (δ30Si) together with concentrations of biogenic opal and organic carbon from the central (9° S) and northern (5° S) Peruvian margin reveal changes in diatom productivity and nutrient utilization during the past 20,000 years. The findings are based on a new approach using the difference between the δ...
The Peruvian margin is characterised by a strong OMZ as result of enhanced surface primary productivity and sluggish ventilation of the subsurface waters. This present study investigated the potential changes in the structure and shape of the OMZ since the Last Glacial Maximum using downcore distributions of the benthic foraminiferal assemblages. T...
The Peruvian Oxygen Minimum Zone (OMZ) is one of the strongest and most pronounced OMZs in today’s world oceans and thus is a key area to understand changing redox conditions in relation with changing climate. Vertical and horizontal changes or an extension of the OMZ through time and space are investigated using a sediment core from the lower OMZ...
Present day oceans are well ventilated, with the exception of mid-depth oxygen minimum zones (OMZs) under high surface water productivity, regions of sluggish circulation, and restricted marginal basins. In the Mesozoic, however, entire oceanic basins transiently became dysoxic or anoxic. The Cretaceous ocean anoxic events (OAEs) were characterised...
Present day oceans are well ventilated, with the exception of mid-depth oxygen minimum zones (OMZs) under high surface water productivity, regions of sluggish circulation, and restricted marginal basins. In the Mesozoic, however, entire oceanic basins transiently became dysoxic or anoxic. The Cretaceous ocean anoxic events (OAEs) were characterised...
The Loop Current and its associated eddy-shedding in the Gulf of Mexico are mediating the oceanic heat and salt flux from the Caribbean into the Atlantic Ocean via Yucatan Strait. Changes in Yucatan Strait surface and intermediate through flow over geological timescales in relation to sea level, through flow velocity, and atmospheric circulation ar...
The Peruvian coastal region has long been in the focus of marine geological investigations because of its importance to understand high productivity areas and the oxygen minimum zones (OMZs) in today’s and past oceans. The reconstruction of paleoenvironmental conditions for periods since the Last Glacial Maximum was hampered by a ubiquitous hiatus...
Present day oceans are generally well ventilated except mid-depth oxygen minimum zones (OMZs) under high surface water productivity
regimes, regions of sluggish circulation, and restricted marginal basins. In the Mesozoic, however, entire oceanic basins transiently
became dysoxic or even anoxic. In particular the Cretaceous Ocean Anoxic Events (OAE...
In this paper we provide an overview of new knowledge on oxygen depletion
(hypoxia) and related phenomena in aquatic systems resulting from the EU-FP7
project HYPOX ("In situ monitoring of oxygen depletion in hypoxic
ecosystems of coastal and open seas, and landlocked water bodies",
http://www.hypox.net). In view of the anticipated oxygen loss in a...
The Peruvian coastal region is characterized by one of the most extensive oxygen minimum zones (OMZ) of today's world oceans. In order to investigate long term variations of past oxygen conditions, sediment cores have been collected from the shelf and slope off Peru during R/V Meteor cruises M77/1 and M77/2 between 1 to 18 ° S and water depths of 2...
In this paper we synthesize the new knowledge on oxygen and oxygen-related phenomena
in aquatic systems, resulting from the EU-FP7 project HYPOX (“In situ monitoring
of oxygen depletion in hypoxic ecosystems of coastal and open seas, and land-locked
water bodies”, www.hypox.net). In view of the anticipated oxygen loss in aquatic systems
due to eutr...
İstanbul Strait (Bosphorus) is the only connection of Black Sea to
the world ocean via the Sea of Marmara and Çanakkale
(Dardannelles) Strait. The İstanbul Strait outlet area of the Black
Sea (ISBS) includes the shelf and upper slope areas, and is
characterized by the Mediterranean inflow that is responsible for the
ventilation and sluggish deep ci...
Lake Van is located on the East Anatolian Plateau of Turkey, which is a
key area to obtain long-term regional paleoclimate records. This study
is based on the correlation of seismic reflection data acquired by
IFM-GEOMAR in 2004 and the borehole stratigraphic information obtained
from two sites drilled by International Continental Scientific Drilli...
Questions
Question (1)
I am working with benthic foraminifera taxonomy at samples from Peruvian continental slope and I am collecting any information I can find for the most dominant species. Bolivina costata d'Orbigny, 1839 is one of them but not described in somewhere else except Peruvian shelf (shallow waters). it is also not listed in WORMS. I was wondering if someone has an opinion about this species.
