NDLI: Biogeochemical evidence of large diapycnal diffusivity associated with the subtropical mode water of the North Pacific

Content Provider	Springer Nature Link
Author	Sukigara, Chiho Suga, Toshio Sai, Toshiro Toyama, Katsuya Yanagimoto, Daigo Hanawa, Kimio Shikama, buyuki
Copyright Year	2011
Abstract	A profiling float equipped with a fluorimeter, a dissolved oxygen (DO) sensor, and temperature and salinity sensors was deployed in the subtropical mode water (STMW) formation region of the North Pacific. It acquired quasi-Lagrangian, 5-day-interval time-series records from March to July 2006. The time-series distribution of chlorophyll showed a sustained and sizable subsurface maximum at 50–100 m, just above the upper boundary of the STMW, throughout early summer (May–July). The DO concentration in this lower euphotic zone (50–100 m) was almost constant and supersaturated in the same period, becoming more supersaturated with time. On the other hand, the DO concentration at 100–150 m near the upper boundary of the STMW decreased much more slowly compared with the main layer of STMW below 150 m, even though oxygen consumption by organisms was expected to be larger in the former depth range. The small temporal variations of DO in the lower euphotic zone and near the upper boundary of the STMW were reasonably explained by downward oxygen transport because of large diapycnal diffusion near the top of the STMW. Assuming that the oxygen consumption rate at 100–150 m was the same as that in the main layer of STMW and compensated by the downward oxygen flux, the diapycnal diffusivity was estimated to be 1.7 × 10$^{−4}$ m$^{2}$ s$^{−1}$. Nitrate transport into the euphotic zone by the same large diffusion was estimated to be 0.8 mmol N m$^{−2}$ day$^{−1}$. All of the transported nitrate could have been used for photosynthesis by the phytoplankton; net community production was estimated to be 5.3 mmol C m$^{−2}$ day$^{−1}$.
Starting Page	77
Ending Page	85
Page Count	9
File Format	PDF
ISSN	09168370
Journal	Journal of Oceanography
Volume Number	67
Issue Number	1
e-ISSN	1573868X
Language	English
Publisher	Springer Japan
Publisher Date	2011-02-23
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Subtropical mode water Profiling float Diapycnal diffusivity Dissolved oxygen Deep chlorophyll maximum Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Distribution and photo-physiological condition of phytoplankton in the tropical and subtropical North Pacific

Seasonal and interannual variation of North Pacific Subtropical Mode Water in 2003–2006

Further evidence for non-reemergence of winter SST anomalies in the North Pacific eastern subtropical mode water area

Decadal seesaw of the Central and Subtropical Mode Water formation associated with the Kuroshio Extension variability

Progress of North Pacific mode water research in the past decade

Decadal variability of Subtropical Mode Water subduction and its impact on biogeochemistry

Review on North Pacific Subtropical Countercurrents and Subtropical Fronts: role of mode waters in ocean circulation and climate

Response of the North Pacific subtropical countercurrent and its variability to global warming

Pathway and variability of deep circulation around 40°N in the northwest Pacific Ocean

Biogeochemical evidence of large diapycnal diffusivity associated with the subtropical mode water of the North Pacific

Similar Documents

Distribution and photo-physiological condition of phytoplankton in the tropical and subtropical North Pacific

Seasonal and interannual variation of North Pacific Subtropical Mode Water in 2003–2006

Further evidence for non-reemergence of winter SST anomalies in the North Pacific eastern subtropical mode water area

Decadal seesaw of the Central and Subtropical Mode Water formation associated with the Kuroshio Extension variability

Progress of North Pacific mode water research in the past decade

Decadal variability of Subtropical Mode Water subduction and its impact on biogeochemistry

Review on North Pacific Subtropical Countercurrents and Subtropical Fronts: role of mode waters in ocean circulation and climate

Response of the North Pacific subtropical countercurrent and its variability to global warming

Pathway and variability of deep circulation around 40°N in the northwest Pacific Ocean

Biogeochemical evidence of large diapycnal diffusivity associated with the subtropical mode water of the North Pacific