Increasing subtropical North Pacific Ocean nitrogen fixation since the Little Ice Age

Nature ◽  
2013 ◽  
Vol 505 (7481) ◽  
pp. 78-81 ◽  
Author(s):  
Owen A. Sherwood ◽  
Thomas P. Guilderson ◽  
Fabian C. Batista ◽  
John T. Schiff ◽  
Matthew D. McCarthy
Keyword(s):  
Nitrogen Fixation ◽  
Pacific Ocean ◽  
North Pacific ◽  
Little Ice Age ◽  
North Pacific Ocean ◽  
Ice Age

scholarly journals Biological nitrogen fixation in the oxygen-minimum region of the eastern tropical North Pacific ocean

2017 ◽  
Vol 11 (10) ◽  
pp. 2356-2367 ◽  
Author(s):  
Amal Jayakumar ◽  
Bonnie X Chang ◽  
Brittany Widner ◽  
Peter Bernhardt ◽  
Margaret R Mulholland ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Pacific Ocean ◽  
North Pacific ◽  
Biological Nitrogen Fixation ◽  
North Pacific Ocean ◽  
Biological Nitrogen ◽  
Oxygen Minimum

scholarly journals The role of nitrogen fixation in biogeochemical cycling in the subtropical North Pacific Ocean

Nature ◽  
10.1038/41474 ◽  
1997 ◽  
Vol 388 (6642) ◽  
pp. 533-538 ◽  
Author(s):  
D. Karl ◽  
R. Letelier ◽  
L. Tupas ◽  
J. Dore ◽  
J. Christian ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Biogeochemical Cycling

Nitrogen fixation in the North Pacific Ocean

1974 ◽  
Vol 24 (2) ◽  
pp. 109-119 ◽  
Author(s):  
T. H. Mague ◽  
N. M. Weare ◽  
O. Holm-Hansen
Keyword(s):  
Nitrogen Fixation ◽  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
The North ◽  
The North Pacific

scholarly journals Nitrogen fixation in an anticyclonic eddy in the oligotrophic North Pacific Ocean

2008 ◽  
Vol 2 (6) ◽  
pp. 663-676 ◽  
Author(s):  
Allison A Fong ◽  
David M Karl ◽  
Roger Lukas ◽  
Ricardo M Letelier ◽  
Jonathan P Zehr ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Anticyclonic Eddy

scholarly journals Phosphate availability and the ultimate control of new nitrogen input by nitrogen fixation in the tropical Pacific Ocean

2008 ◽  
Vol 5 (1) ◽  
pp. 95-109 ◽  
Author(s):  
T. Moutin ◽  
D. M. Karl ◽  
S. Duhamel ◽  
P. Rimmelin ◽  
P. Raimbault ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Pacific Ocean ◽  
N2 Fixation ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Deep Ocean ◽  
Phosphate Limitation ◽  
Iron Availability ◽  
The North ◽  
The North Pacific

Abstract. Due to the low atmospheric input of phosphate into the open ocean, it is one of the key nutrients that could ultimately control primary production and carbon export into the deep ocean. The observed trend over the last 20 years has shown a decrease in the dissolved inorganic phosphate (DIP) pool in the North Pacific gyre, which has been correlated to the increase in di-nitrogen (N2) fixation rates. Following a NW-SE transect, in the Southeast Pacific during the early austral summer (BIOSOPE cruise), we present data on DIP, dissolved organic phosphate (DOP) and particulate phosphate (PP) pools along with DIP turnover times (TDIP) and N2 fixation rates. We observed a decrease in DIP concentration from the edges to the centre of the gyre. Nevertheless the DIP concentrations remained above 100 nmol L−1 and T DIP was more than 6 months in the centre of the gyre; DIP availability remained largely above the level required for phosphate limitation to occur and the absence of Trichodesmium spp and low nitrogen fixation rates were likely to be controlled by other factors such as temperature or iron availability. This contrasts with recent observations in the North Pacific Ocean at the ALOHA station and in the western Pacific Ocean at the same latitude (DIAPALIS cruises) where lower DIP concentrations (<20 nmol L−1) and T DIP <50 h were measured during the summer season in the upper layer. The South Pacific gyre can be considered a High Phosphate Low Chlorophyll (HPLC) oligotrophic area, which could potentially support high N2 fixation rates and possibly carbon dioxide sequestration, if the primary ecophysiological controls, temperature and/or iron availability, were alleviated.

scholarly journals Nitrogen fixation by unicellular diazotrophic cyanobacteria in the temperate oligotrophic North Pacific Ocean

2007 ◽  
Vol 52 (4) ◽  
pp. 1317-1327 ◽  
Author(s):  
Joseph A. Needoba ◽  
Rachel A. Foster ◽  
Carole Sakamoto ◽  
Jonathan P. Zehr ◽  
Kenneth S. Johnson
Keyword(s):  
Nitrogen Fixation ◽  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Diazotrophic Cyanobacteria
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