scholarly journals Net community production in the deep euphotic zone of the subtropical North Pacific gyre from glider surveys

2008 ◽  
Vol 53 (5part2) ◽  
pp. 2226-2236 ◽  
Author(s):  
David Nicholson ◽  
Steven Emerson ◽  
Charles C. Eriksen
Keyword(s):  
North Pacific ◽  
Euphotic Zone ◽  
Net Community Production ◽  
North Pacific Gyre ◽  
Community Production

scholarly journals Nanomolar phosphate supply and its recycling drive net community production in the subtropical North Pacific

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Fuminori Hashihama ◽  
Ichiro Yasuda ◽  
Aki Kumabe ◽  
Mitsuhide Sato ◽  
Hiroshi Sasaoka ◽  
...  
Keyword(s):  
North Pacific ◽  
Dissolved Inorganic Carbon ◽  
Euphotic Zone ◽  
Vital Role ◽  
Net Community Production ◽  
Molar Ratios ◽  
C And N ◽  
N 93 ◽  
20 Nm ◽  
Community Production

AbstractSeasonal drawdown of dissolved inorganic carbon (DIC) in the subtropical upper ocean makes a significant contribution to net community production (NCP) globally. Although NCP requires macronutrient supply, surface macronutrients are chronically depleted, and their supply has been unable to balance the NCP demand. Here, we report nanomolar increases in surface nitrate plus nitrite (N+N, ~20 nM) and phosphate (PO4, ~15 nM) from summer to winter in the western subtropical North Pacific. Molar ratios of upward fluxes of DIC:N+N:PO4 to the euphotic zone (< 100 m) were in near-stoichiometric balance with microbial C:N:P ratios (107~243:16~35:1). Comparison of these upward influxes with other atmospheric and marine sources demonstrated that total supply is largely driven by the other sources for C and N (93~96%), but not for P (10%), suggesting that nanomolar upward supply of P and its preferential recycling play a vital role in sustaining the NCP.

Interannual variations of net community production and air-sea CO2 flux from winter to spring in the western subarctic North Pacific

Tellus B ◽  
2003 ◽  
Vol 55 (2) ◽  
pp. 466-477 ◽  
Author(s):  
TAKASHI MIDORIKAWA ◽  
KAN OGAWA ◽  
KAZUHIRO NEMOTO ◽  
HITOMI KAMIYA ◽  
TAKAFUMI UMEDA ◽  
...  
Keyword(s):  
North Pacific ◽  
Co2 Flux ◽  
Interannual Variations ◽  
Net Community Production ◽  
Subarctic North Pacific ◽  
Western Subarctic North Pacific ◽  
Community Production

scholarly journals Interannual variations of net community production and air—sea CO2flux from winter to spring in the western subarctic North Pacific

Tellus B ◽  
2003 ◽  
Vol 55 (2) ◽  
pp. 466-477
Author(s):  
Takashi Midorikawa ◽  
Kan Ogawa ◽  
Kazuhiro Nemoto ◽  
Hitomi Kamiya ◽  
Takafumi Umeda ◽  
...  
Keyword(s):  
North Pacific ◽  
Interannual Variations ◽  
Net Community Production ◽  
Subarctic North Pacific ◽  
Western Subarctic North Pacific ◽  
Community Production

scholarly journals Effects of storms on primary productivity and air-sea CO<sub>2</sub> exchange in the subarctic western North Pacific: a modeling study

2008 ◽  
Vol 5 (4) ◽  
pp. 1189-1197 ◽  
Author(s):  
M. Fujii ◽  
Y. Yamanaka
Keyword(s):  
North Pacific ◽  
Western North Pacific ◽  
Marine Ecosystem ◽  
Ecosystem Model ◽  
Light Limitation ◽  
Co2 Uptake ◽  
Net Community Production ◽  
Marine Ecosystem Model ◽  
Strong Winds ◽  
Community Production

Abstract. Biogeochemical responses of the open ocean to storms and their feedback to climate are still poorly understood. Using a marine ecosystem model, we examined biogeochemical responses to the storms in the subarctic western North Pacific. The storms in summer through early autumn enhance net community production by wind-induced nutrient injections into the surface waters while the storms in the other seasons reduce net community production by intensifying light limitation on the phytoplankton growth due to vertical dilution of the phytoplankton. The two compensating effects diminish the storm-induced annual change of net community production to only 1%. On the contrary, the storms reduce the annual oceanic uptake of the atmospheric CO2 by 3%, resulting from storm-induced strong winds. Our results suggest that previous studies using climatological wind, sea level pressure, and CO2 data probably overestimated the air-to-sea CO2 influx during storms in the subarctic western North Pacific, and therefore, continuous high-frequent observations of these variables are required to reduce uncertainties in the global oceanic CO2 uptake.

scholarly journals Simultaneous assessment of oxygen and nitrate-based net community production in a temperate shelf sea from a single ocean glider

2021 ◽  
Author(s):  
Tom Hull ◽  
Naomi Greenwood ◽  
Antony Birchill ◽  
Alexander Beaton ◽  
Mathew Palmer ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Euphotic Zone ◽  
Global Scale ◽  
Net Community Production ◽  
Wide Range ◽  
Shelf Seas ◽  
Shelf Sea ◽  
Autonomous Underwater Glider ◽  
Community Production

Abstract. The continental shelf seas are important at a global scale for ecosystem services. These highly dynamic regions are under a wide range of stresses and as such future management requires appropriate monitoring measures. A key metric to understanding and predicting future change are the rates of biological productivity. We present here the use of a single autonomous underwater glider with oxygen (O2) and total oxidised nitrogen (NOx− = NO3− + NO2−) sensors during a spring bloom as part of a 2019 pilot autonomous shelf sea monitoring study. We find exceptionally high rates of net community production using both O2 and NOx− water column inventory changes, corrected for air-sea gas exchange in case of O2. We compare these rates with 2007 and 2008 mooring observations finding similar rates of NOx− consumption. With these complementary methods we determine the O:N amount ratio of the newly produced organic matter (7.8±0.4) and the overall O2:N ratio for the total water column (5.7±0.4). The former is close to the canonical Redfield O2:N ratio of 8.6±1.0, whereas the latter may be explained by a combination of new organic matter production and preferential remineralisation of more reduced organic matter at a higher O2:N ratio below the euphotic zone.

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