scholarly journals North Pacific dissolved inorganic carbon variations related to the Pacific Decadal Oscillation

2014 ◽  
Vol 41 (3) ◽  
pp. 1005-1011 ◽  
Author(s):  
Sayaka Yasunaka ◽  
Yukihiro Nojiri ◽  
Shin-ichiro Nakaoka ◽  
Tsuneo Ono ◽  
Hitoshi Mukai ◽  
...  
Keyword(s):  
Pacific Decadal Oscillation ◽  
North Pacific ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
The Pacific

Temporal Change of Dissolved Inorganic Carbon in the Subsurface Water at Station KNOT (44°N, 155°E) in the Western North Pacific Subpolar Region

2005 ◽  
Vol 61 (1) ◽  
pp. 129-139 ◽  
Author(s):  
Masahide Wakita ◽  
Shuichi Watanabe ◽  
Yutaka W. Watanabe ◽  
Tsuneo Ono ◽  
Nobuo Tsurushima ◽  
...  
Keyword(s):  
North Pacific ◽  
Western North Pacific ◽  
Inorganic Carbon ◽  
Temporal Change ◽  
Dissolved Inorganic Carbon ◽  
Subsurface Water

scholarly journals Vertically migrating phytoplankton drive seasonal formation of subsurface negative preformed nitrate anomalies in the subtropical North Pacific and North Atlantic

2018 ◽  
Author(s):  
Robert T. Letscher ◽  
Tracy A. Villareal
Keyword(s):  
Organic Matter ◽  
Mixed Layer ◽  
North Atlantic ◽  
North Pacific ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Euphotic Zone ◽  
The North ◽  
Station Aloha ◽  
Biological Nitrogen

Abstract. Summertime drawdown of dissolved inorganic carbon in the absence of measurable nutrients from the mixed layer and subsurface negative preformed nitrate (preNO3) anomalies observed for the ocean's subtropical gyres are two biogeochemical phenomena that have thus far eluded complete description. Many processes are thought to contribute including biological nitrogen fixation, lateral nutrient transport, carbon overconsumption or non-Redfield C : N : P organic matter cycling, heterotrophic nutrient uptake, and the actions of vertically migrating phytoplankton. Here we investigate the seasonal formation rates and potential contributing mechanisms for negative preformed nitrate anomalies (oxygen consumption without stoichiometric nitrate release) in the subsurface and positive preformed nitrate anomalies (oxygen production without stoichiometric nitrate drawdown) in the euphotic zone at the subtropical ocean time series stations ALOHA in the North Pacific and BATS in the North Atlantic. Non-Redfield −O2 : N stoichiometry for dissolved organic matter (DOM) remineralization is found to account for up to ~ 15 mmol N m−2 yr−1 of negative preNO3 anomaly formation at both stations. Residual negative preNO3 anomalies in excess of that which can be accounted for by non-Redfield DOM cycling are found to accumulate at a rate of ~ 32–46 mmol N m−2 yr−1 at station ALOHA and ~ 46–87 mmol N m−2 yr−1 at the BATS station. These negative anomaly formation rates are in approximate balance with positive preNO3 anomaly formation rates from the euphotic zone located immediately above the nutricline in the water column. Cycling of transparent exopolymer particles (TEP) and heterotrophic nitrate uptake can contribute to the formation of these preNO3 anomalies, however a significant fraction, estimated at ~ 50–95 %, is unexplained by the sum of these processes. Vertically migrating phytoplankton possess the necessary nutrient acquisition strategy and biogeochemical signature to quantitatively explain both the residual negative and positive preNO3 anomalies as well as the mixed layer dissolved inorganic carbon drawdown at stations ALOHA and BATS. TEP production by the model Rhizosolenia mat system could provide accelerated vertical transport of TEP as well as link the three processes together. Phytoplankton vertical migrators, although rare and easily overlooked, may play a large role in subtropical ocean nutrient cycling and the biological pump.

scholarly journals Decadal changes in dissolved inorganic carbon in the Pacific Ocean

2013 ◽  
Vol 27 (1) ◽  
pp. 65-76 ◽  
Author(s):  
Shinya Kouketsu ◽  
Akihiko Murata ◽  
Toshimasa Doi
Keyword(s):  
Pacific Ocean ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
The Pacific ◽  
The Pacific Ocean

The Forcing of the Pacific Decadal Oscillation*

2005 ◽  
Vol 18 (21) ◽  
pp. 4355-4373 ◽  
Author(s):  
Niklas Schneider ◽  
Bruce D. Cornuelle
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Pacific Decadal Oscillation ◽  
North Pacific ◽  
Sea Surface ◽  
Aleutian Low ◽  
The Pacific ◽  
Sea Surface Temperature Anomalies ◽  
Zonal Advection ◽  
The Kuroshio

Abstract The Pacific decadal oscillation (PDO), defined as the leading empirical orthogonal function of North Pacific sea surface temperature anomalies, is a widely used index for decadal variability. It is shown that the PDO can be recovered from a reconstruction of North Pacific sea surface temperature anomalies based on a first-order autoregressive model and forcing by variability of the Aleutian low, El Niño–Southern Oscillation (ENSO), and oceanic zonal advection anomalies in the Kuroshio–Oyashio Extension. The latter results from oceanic Rossby waves that are forced by North Pacific Ekman pumping. The SST response patterns to these processes are not orthogonal, and they determine the spatial characteristics of the PDO. The importance of the different forcing processes is frequency dependent. At interannual time scales, forcing from ENSO and the Aleutian low determines the response in equal parts. At decadal time scales, zonal advection in the Kuroshio–Oyashio Extension, ENSO, and anomalies of the Aleutian low each account for similar amounts of the PDO variance. These results support the hypothesis that the PDO is not a dynamical mode, but arises from the superposition of sea surface temperature fluctuations with different dynamical origins.

The Pacific Decadal Oscillation, Revisited

2016 ◽  
Vol 29 (12) ◽  
pp. 4399-4427 ◽  
Author(s):  
Matthew Newman ◽  
Michael A. Alexander ◽  
Toby R. Ault ◽  
Kim M. Cobb ◽  
Clara Deser ◽  
...  
Keyword(s):  
Pacific Decadal Oscillation ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Regional Climate ◽  
Climate Impacts ◽  
Ongoing Research ◽  
Tropical Forcing ◽  
Sst Variability ◽  
The Pacific ◽  
Recent Climate

Abstract The Pacific decadal oscillation (PDO), the dominant year-round pattern of monthly North Pacific sea surface temperature (SST) variability, is an important target of ongoing research within the meteorological and climate dynamics communities and is central to the work of many geologists, ecologists, natural resource managers, and social scientists. Research over the last 15 years has led to an emerging consensus: the PDO is not a single phenomenon, but is instead the result of a combination of different physical processes, including both remote tropical forcing and local North Pacific atmosphere–ocean interactions, which operate on different time scales to drive similar PDO-like SST anomaly patterns. How these processes combine to generate the observed PDO evolution, including apparent regime shifts, is shown using simple autoregressive models of increasing spatial complexity. Simulations of recent climate in coupled GCMs are able to capture many aspects of the PDO, but do so based on a balance of processes often more independent of the tropics than is observed. Finally, it is suggested that the assessment of PDO-related regional climate impacts, reconstruction of PDO-related variability into the past with proxy records, and diagnosis of Pacific variability within coupled GCMs should all account for the effects of these different processes, which only partly represent the direct forcing of the atmosphere by North Pacific Ocean SSTs.

Time-series observation of dissolved inorganic carbon and nutrients in the northwestern North Pacific

2007 ◽  
Vol 63 (6) ◽  
pp. 967-982 ◽  
Author(s):  
Hajime Kawakami ◽  
Makio C. Honda ◽  
Masahide Wakita ◽  
Shuichi Watanabe
Keyword(s):  
Time Series ◽  
North Pacific ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon
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