Markus Kienast
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View article: Not all continental shelf seafloor is the same: detailed sediment characterization dramatically reduces estimates of organic carbon standing stock
Not all continental shelf seafloor is the same: detailed sediment characterization dramatically reduces estimates of organic carbon standing stock Open
Continental shelf sediments contain some of the largest stocks of organic carbon (OC) on Earth and critically influence the global carbon cycle. Quantifying how much OC continental shelves store and determining its residence time is key to…
View article: Combining sediment analysis with geospatial mapping to quantify carbon sequestration by an eelgrass bed on the Nova Scotian coast, eastern Canada. 
Combining sediment analysis with geospatial mapping to quantify carbon sequestration by an eelgrass bed on the Nova Scotian coast, eastern Canada.  Open
In recent years, seagrass has been presented as a solution to sequester excess carbon emissions from the atmosphere, with studies reporting that seagrass meadows are responsible for burying as much as 10% of anthropogenic carbon per year (…
View article: Radiocarbon ages of western Pacific intermediate waters during the past 25 kyrs: Implications for global carbon cycling
Radiocarbon ages of western Pacific intermediate waters during the past 25 kyrs: Implications for global carbon cycling Open
The rapid increase of atmospheric carbon dioxide (CO2) and the concurrent decline in Δ14C during the last deglaciation were mainly ascribed to the release of old, 14C-depleted CO2 from an abyssal ocean reservoir, specifically the Sout…
View article: Southern Hemisphere water mass transport to the Arabian Sea linked to Greenland climate variability during Heinrich Event 4 
Southern Hemisphere water mass transport to the Arabian Sea linked to Greenland climate variability during Heinrich Event 4  Open
Several paleoceanographic and climate modeling studies have shown both oceanic and atmospheric teleconnections between climate in the tropics and the high latitudes on timescales ranging from decadal to multi-centennial. The last glacial p…
View article: Water Column Structure and Nutrient Supply on the Northwest Atlantic Shelf: A Nitrate Isotope Study
Water Column Structure and Nutrient Supply on the Northwest Atlantic Shelf: A Nitrate Isotope Study Open
The Northwest Atlantic continental shelf is a highly productive marine region with major uncertainties regarding the supply mechanisms of nutrients fueling productivity. This study uses nitrate isotopes (δ 15 N NO3 and δ 18 O NO3 ) from th…
View article: Widespread occurrence and relevance of phosphate storage in foraminifera
Widespread occurrence and relevance of phosphate storage in foraminifera Open
Foraminifera are ubiquitous marine protists that intracellularly accumulate phosphate 1 , an important macronutrient in marine ecosystems and in fertilizer potentially leaked into the ocean. Intracellular phosphate concentrations can be 10…
View article: Seafloor sediment characterization improves estimates of organic carbon standing stocks: an example from the Eastern Shore Islands, Nova Scotia, Canada
Seafloor sediment characterization improves estimates of organic carbon standing stocks: an example from the Eastern Shore Islands, Nova Scotia, Canada Open
Continental shelf sediments contain some of the largest stocks of organic carbon (OC) on Earth and play a vital role in influencing the global carbon cycle. Quantifying how much OC is stored in shelf sediments and determining its residence…
View article: Sea Surface Temperatures Across the Coral Sea Over the Last Glacial‐Interglacial Cycle
Sea Surface Temperatures Across the Coral Sea Over the Last Glacial‐Interglacial Cycle Open
Sea surface temperature (SST) across the Coral Sea is tightly coupled to the regional and larger‐scale ocean circulation and climate. Continuous records that reflect past changes in Coral Sea SST in high resolution are missing, however. He…
View article: Shifting sediment depocenters track ice-margin retreat in Baffin Bay
Shifting sediment depocenters track ice-margin retreat in Baffin Bay Open
Reconstructing the depositional history of Baffin Bay allows insights into the deglacial retreat of the Laurentide, Innuitian, and Greenland ice sheets from their maximum extent during the Last Glacial Maximum. Here, we present radiocarbon…
View article: Migrations of the Indo-Pacific Warm Pool through the past eight glacial cycles
Migrations of the Indo-Pacific Warm Pool through the past eight glacial cycles Open
High-resolution and long-term paleorecords from the central Indo-Pacific Warm Pool (IPWP) will help us understand tropical climates. Here, we present a high-resolution record (alkenone SST, alkenone mass accumulation rate and opal content …
View article: Comment on egusphere-2024-5
Comment on egusphere-2024-5 Open
Abstract. Continental shelf sediments contain some of the largest stocks of organic carbon (OC) on Earth and play a vital role in influencing the global carbon cycle. Quantifying how much OC is stored in shelf sediments and determining its…
View article: Seafloor sediment characterization to improve estimate of organic carbon standing stocks in continental shelves
Seafloor sediment characterization to improve estimate of organic carbon standing stocks in continental shelves Open
Continental shelf sediments contain some of the largest stocks of organic carbon (OC) on Earth and play a vital role in influencing the global carbon cycle. Quantifying how much OC is stored in shelf sediments and determining its residence…
View article: Caribbean salinity anomalies contributed to variable North Atlantic circulation and climate during the Common Era
Caribbean salinity anomalies contributed to variable North Atlantic circulation and climate during the Common Era Open
Paleoceanographic reconstructions show that the strength of North Atlantic currents decreased during the Little Ice Age. In contrast, the role of ocean circulation in climate regulation during earlier historical epochs of the Common Era (C…
View article: Biomarker Records of Environmental Shifts on the Labrador Shelf During the Holocene
Biomarker Records of Environmental Shifts on the Labrador Shelf During the Holocene Open
The ultimate demise of the Laurentide Ice Sheet (LIS) and the preceding and succeeding oceanographic changes along the western Labrador Sea offer insights critically important to improve climate predictions of expected future climate warmi…
View article: Code of the Bayesian Age model of core MSM45_19-2.
Code of the Bayesian Age model of core MSM45_19-2. Open
Code of the Bayesian Age model of core MSM45_19-2. Related to the publication 'Biomarker records of environmental shifts on the Labrador Shelf during the Holocene' (currently under review in Paleoceanography & Paleoclimatology.
View article: Sedimentation rates across Baffin Bay since the last glacial period (based on radiocarbon age control)
Sedimentation rates across Baffin Bay since the last glacial period (based on radiocarbon age control) Open
Around Baffin Bay, the large continental Laurentide, Innuitian, and Greenland ice sheets retreated from their maximum extent reaching the shelf break during the Last Glacial Maximum (LGM) to their present-day close-to-minimum extent being …
View article: Authigenic and Detrital Carbonate Nd Isotope Records Reflect Pulses of Detrital Material Input to the Labrador Sea During the Heinrich Stadials
Authigenic and Detrital Carbonate Nd Isotope Records Reflect Pulses of Detrital Material Input to the Labrador Sea During the Heinrich Stadials Open
Limited constraints on the variability of the deep‐water production in the Labrador Sea complicate reconstructions of the strength of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Quaternary. Large volumes of detri…
View article: On sources and sinks of bioavailable nitrogen on the Scotian Shelf: Insights from nutrient distributions and nitrate isotope ratios
On sources and sinks of bioavailable nitrogen on the Scotian Shelf: Insights from nutrient distributions and nitrate isotope ratios Open
<p>The northwestern North Atlantic, and the extensive Northwest Atlantic Shelf in particular, are among the areas of the world&#8217;s ocean most dramatically affected by ongoing climate change. Profound alterations of nitrogen (…
View article: Deglacial to Holocene changes in sediment characteristics and provenance in core GeoB22336-4 from Lancaster Sound Trough Mouth: Implications for environmental conditions in northwestern Baffin Bay
Deglacial to Holocene changes in sediment characteristics and provenance in core GeoB22336-4 from Lancaster Sound Trough Mouth: Implications for environmental conditions in northwestern Baffin Bay Open
<p>The Lancaster Sound is currently one of the pathways for Arctic water and ice entering Baffin Bay. However, this gateway was blocked by the coalescing Laurentide and Innuitian Ice Sheets during the Last Glacial Maximum and only op…
View article: Comment on bg-2021-104
Comment on bg-2021-104 Open
Abstract. Nitrogen (N2) fixation, the energetically expensive conversion of N2 to ammonia, plays an important role in balancing the global nitrogen budget. Defying historic paradigms, recent studies have detected non-cyanobacterial N2 fixa…
View article: Long-term ocean and resource dynamics in a hotspot of climate change
Long-term ocean and resource dynamics in a hotspot of climate change Open
The abundance, distribution, and size of marine species are linked to temperature and nutrient regimes and are profoundly affected by humans through exploitation and climate change. Yet little is known about long-term historical links betw…
View article: Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin
Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin Open
The flow of Pacific water to the North Atlantic exerts a globally significant control on nutrient balances between the two ocean basins and strongly influences biological productivity in the northwest Atlantic. Nutrient ratios of nitrate (…
View article: Data to accompany "Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin".
Data to accompany "Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin". Open
This dataset accompanies the article by Owen A. Sherwood, Samuel H. Davin, Nadine Lehmann, Carolyn Buchwald, Evan N. Edinger, Moritz F. Lehmann, and Markus Kienast: "Stable isotope ratios in seawater nitrate reflect the influence of Pacifi…
View article: Data to accompany "Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin".
Data to accompany "Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin". Open
This dataset accompanies the article by Owen A. Sherwood, Samuel H. Davin, Nadine Lehmann, Carolyn Buchwald, Evan N. Edinger, Moritz F. Lehmann, and Markus Kienast: "Stable isotope ratios in seawater nitrate reflect the influence of Pacifi…