scholarly journals Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin

2021 ◽  
Vol 18 (15) ◽  
pp. 4491-4510
Author(s):  
Owen A. Sherwood ◽  
Samuel H. Davin ◽  
Nadine Lehmann ◽  
Carolyn Buchwald ◽  
Evan N. Edinger ◽  
...  
Keyword(s):  
North Atlantic ◽  
Nutrient Ratios ◽  
Nutrient Balances ◽  
Pacific Water ◽  
Northwest Atlantic ◽  
Significant Control ◽  
The North ◽  
Marine Biomass ◽  
The North Atlantic ◽  
Atlantic Margin

Abstract. 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 (NO3-) versus phosphate (PO43-) have previously been used to complement salinity characteristics in tracing the distribution of Pacific water in the North Atlantic. We expand on this premise and demonstrate that the fraction of Pacific water as determined by NO3- : PO43- ratios can be quantitatively predicted from the isotopic composition of sub-euphotic nitrate in the northwest Atlantic. Our linear model thus provides a critically important framework for interpreting δ15N signatures incorporated into both modern marine biomass and organic material in historical and paleoceanographic archives along the northwest Atlantic margin.

scholarly journals Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the Northwest Atlantic margin

2021 ◽  
Author(s):  
Owen A. Sherwood ◽  
Samuel H. Davin ◽  
Nadine Lehmann ◽  
Carolyn Buchwald ◽  
Evan N. Edinger ◽  
...  
Keyword(s):  
North Atlantic ◽  
Nutrient Ratios ◽  
Nutrient Balances ◽  
Pacific Water ◽  
Northwest Atlantic ◽  
Significant Control ◽  
The North ◽  
Marine Biomass ◽  
The North Atlantic ◽  
Atlantic Margin

Abstract. 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 (N) versus phosphate (P) have previously been used to complement salinity characteristics in tracing the distribution of Pacific water in the North Atlantic. We expand on this premise and demonstrate that the fraction of Pacific water as determined by N / P ratios can be quantitatively predicted from the isotopic composition of sub-euphotic nitrate in the Northwest Atlantic. Our linear model thus provides a critically important framework for interpreting δ15N signatures incorporated into both modern marine biomass, as well as organic material in historical and paleoceanographic archives along the Northwest Atlantic margin.

Mass failure of the North Atlantic margin triggered by the Cretaceous-Paleogene bolide impact

Geology ◽  
2000 ◽  
Vol 28 (12) ◽  
pp. 1119 ◽  
Author(s):  
Richard D. Norris ◽  
John Firth ◽  
Jerzy S. Blusztajn ◽  
Gregory Ravizza
Keyword(s):  
North Atlantic ◽  
The North ◽  
The North Atlantic ◽  
Mass Failure ◽  
Atlantic Margin ◽  
North Atlantic Margin

scholarly journals The North Pacific Diatom Species Neodenticula seminae in the Modern and Holocene Sediments of the North Atlantic and Arctic

Geosciences ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 173
Author(s):  
Alexander Matul ◽  
Galina Kh. Kazarina
Keyword(s):  
North Atlantic ◽  
North Pacific ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Diatom Species ◽  
Pacific Water ◽  
The North ◽  
Holocene Sediments ◽  
The North Atlantic ◽  
The North Pacific

The paper presents micropaleontological information and observations of the North Pacific diatom species Neodenticula (N.) seminae (Simonsen and Kanaya) Akiba and Yanagisawa in the surface and Holocene sediments from the North Atlantic, Nordic, and Arctic Seas. The compilation of previously published data and new findings of this study on N. seminae in the surface sediments shows its broad occurrence as a usual element of the modern diatom microflora in the Nordic, Labrador, and Irminger Seas. The recent migration of N. seminae from its native area, the Subarctic Pacific, reflects the oceanographic shift in the late 1990s as greater transport of the warmer surface Pacific water to the Arctic causes Arctic sea-ice reduction. Micropaleontological studies of the Holocene sediments document the multiple events of N. seminae appearance in the Arctic during the latest Pleistocene and Holocene warming intervals. These observations can suggest the events of the increased influence of the North Pacific water on the Arctic environments in the past, not just during the recent warm climate amplification.

Program investigates the North Atlantic margin

Eos ◽  
1993 ◽  
Vol 74 (49) ◽  
pp. 578 ◽  
Author(s):  
J. Mienert ◽  
J. Baas ◽  
F. Abrantes ◽  
J. Monterio ◽  
G. A. Auffret ◽  
...  
Keyword(s):  
North Atlantic ◽  
The North ◽  
The North Atlantic ◽  
Atlantic Margin ◽  
North Atlantic Margin

Mass failure of the North Atlantic margin triggered by the Cretaceous-Paleogene bolide impact

Geology ◽  
2000 ◽  
Vol 28 (12) ◽  
pp. 1119-1122 ◽  
Author(s):  
Richard D. Norris ◽  
John Firth ◽  
Jerzy S. Blusztajn ◽  
Gregory Ravizza
Keyword(s):  
North Atlantic ◽  
The North ◽  
The North Atlantic ◽  
Mass Failure ◽  
Atlantic Margin ◽  
North Atlantic Margin

First Records of the Gymnoblastic Hydroid, Ichthyocodium sarcotretis, on the Copepod, Sphyrion lumpi, from Redfish of the Northwest Atlantic

1973 ◽  
Vol 30 (11) ◽  
pp. 1655-1660 ◽  
Author(s):  
Wilfred Templeman
Keyword(s):  
Continental Shelf ◽  
North Atlantic ◽  
Labrador Sea ◽  
Northwest Atlantic ◽  
The North ◽  
Irminger Sea ◽  
The North Atlantic ◽  
Sebastes Mentella ◽  
Colonial Hydroid

The gymnoblastic colonial hydroid Ichthyocodium sarcotretis was found on the copepod Sphyrion lumpi on redfish from three areas of the northwest Atlantic: on copepods (three of ten) on deepwater redfish (Sebastes mentella) from about 200–500 m over great depths at the mouth of the Labrador Sea and, in bottom otter trawling, on copepods on S. mentella or possibly S. fasciatus from the Labrador Shelf (6 of 686) and the northeast Newfoundland Shelf (1 of 364). None were found on 492 S. lumpi from redfish taken on the continental shelf south and west of the northeast Newfoundland Shelf.The characteristics of the hydroid colonies and of their feeding polyps and reproductive hydranths and medusae are compared with published information on this hydroid found on the same hosts in the Irminger Sea and on the copepod, Sarcotretes scopeli, on the lantern fish, Benthosema glaciale, in the North Atlantic. The incidence of the hydroid on S. lumpi on redfish may possibly help in distinguishing Sebastes species in the northwest Atlantic.

Sign in / Sign up

Export Citation Format

Share Document