ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Electronic Resource

Dilution of North Pacific Intermediate Water studied with chlorofluorocarbons (1995)

Watanabe, Yutaka W. ; Harada, Koh ; Ishikawa, Kimitoshi

Springer

Journal of oceanography 51 (1995), S. 133-144

add to mindlist on the mindlist

Details

ISSN: 1573-868X

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Assessment was made of residual ratio of North Pacific Intermediate Water (NPIW) produced in subpolar region of the North Pacific using chlorofluorocarbons, CFC-11 and CFC-12 (CCl3F and CCl2F2), along 175°E. NPIW on density horizons less than 26.80σθ remained more than 80% north of 30°N. It was suggested that new NPIW laterally spreads over the northern North Pacific without hardly being diluted by the surroundings. For density horizons greater than 26.80σθ north of 30°N, NPIW remained less than 60%. The difference in the residual ratio between 〈26.80σθ and 〉26.80σθ north of 30°N suggests that NPIW is produced on density horizons less than 26.80σθ, which contacts the atmosphere in the subpolar region, and that NPIW is diluted by upwelling deep water on density horizons greater than 26.80σθ in high latitude of the North Pacific. NPIW on a density horizon of 26.80σθ remained about 50% south of 30°N. The decrease in the horizontal distribution of the residual ratio of NPIW suggests that half the new NPIW produced in the subpolar region is laterally spread over the North Pacific with the southward movement of NPIW.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02236521

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

2

Electronic Resource

Total amount of oceanic excess CO2 taken from the North Pacific subpolar region (1996)

Watanabe, Yutaka W. ; Takahashi, Yoshiyuki ; Kitao, Takashi ; [et al.]

Springer

Journal of oceanography 52 (1996), S. 301-312

add to mindlist on the mindlist

Details

ISSN: 1573-868X

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Concentrations of total carbonate, alkalinity and dissolved oxygen were obtained near the 1973 GEOSECS stations in the North Pacific subpolar region north of 40°N along 175°E between 1993 and 1994. A difference of excess CO2 content between the GEOSECS and our expeditions was estimated. The maximum difference in water column inventory of excess CO2 has increased by about 280 gC m−2 above 2000 m depth which apparently means an uptake of excess CO2 taken from air to sea during the last two decades. An averaged value of the annual flux of excess CO2 at 75–1000 m depth was 8.63±2.01 gC m−2yr−1 in the North Pacific subpolar region. By introducing the annual flux of excess CO2 into a two-box model for the North Pacific subpolar region, a penetration factor of excess CO2 from air to sea was obtained to be 1.08×10−2 gC m−3ppm−1 in the North Pacific subpolar region. Based on this factor, the surface concentration of excess CO2 in the North Pacific subpolar region was estimated to be 68 μmole I−1, suggesting that the North Pacific subpolar region absorbed atmospheric excess CO2 more than the saturated concentration of excess CO2. Total amount of excess CO2 taken from the North Pacific subpolar region by 1993 was estimated to be 36.2×1015 gC, which was equal to about one tenth of that released by human activities after the preindustrial era.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02235925

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

3

Electronic Resource

Preface (1999)

Tsubota, Hiroyuki ; Fukasawa, Masao ; Harada, Koh ; [et al.]

Springer

Journal of oceanography 55 (1999), S. 643-643

add to mindlist on the mindlist

Details

ISSN: 1573-868X

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007899610048

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

4

Electronic Resource

Overview of NOPACCS (Northwest Pacific Carbon Cycle Study) (1999)

Tsubota, Hiroyuki ; Ishizaka, Joji ; Nishimura, Akira ; [et al.]

Springer

Journal of oceanography 55 (1999), S. 645-653

add to mindlist on the mindlist

Details

ISSN: 1573-868X

Keywords: North Pacific ; carbon cycle ; biological pump ; intermediate water ; anthropogenic carbon

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract The Northwest Pacific Carbon Cycle Study (NOPACCS) was a program aimed at investigating the carbon cycle of the North Pacific Ocean, which can be thought of as a large reservoir of carbon dioxide. NOPACCS was also aimed at estimating the North Pacific's capacity as a carbon sink. Project design, scientific results, and data availability, and subsequent projects resulting from this project are also described in this review. Studies of the upper ocean processes focused on the latitudinal differences in the fugacity of carbon dioxide; and on the detail of plankton community structures. Intermediate water was studied in relation to the formation of North Pacific Intermediate Water and the amount of accumulated anthropogenic carbon. The sedimentation process, past carbon cycle and coral reefs were also studied during the project. A preliminary, overall view of the carbon cycle of the North Pacific was drawn from the results of the project and compared to global values.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007803826886

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

5

Electronic Resource

Improved Method for Calculating Anthropogenic CO2 in the Upper Layer of the North Pacific Subtropical Gyre along 175°E (1999)

Takahashi, Yoshiyuki ; Matsumoto, Eiji ; Watanabe, Yutaka W.

Springer

Journal of oceanography 55 (1999), S. 717-729

add to mindlist on the mindlist

Details

ISSN: 1573-868X

Keywords: Carbon cycle ; anthropogenic CO2 ; North Pacific ; subtropical gyre ; NOPACCS

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Seawater samples were collected in the North Pacific along 175°E during a cruise of the Northwest Pacific Carbon Cycle Study (NOPACCS) program in 1994. Many properties related to the carbonate system were analyzed. By using well-known ratios to correct for chemical changes in seawater, the CO2 concentration at a given depth was back calculated to its initial concentration at the time when the water left the surface in winter. We estimated sea-surface CO2 and titration alkalinity (TA) in present-day winter, from which we evaluated the degree of air-sea CO2 disequilibrium in winter was. Using a correction factor for air-sea CO2 disequilibrium in winter, we reconstructed sea-surface CO2 in pre-industrial times. The difference between the back-calculated initial CO2 and sea-surface CO2 in pre-industrial times should correspond to anthropgenic CO2 input. Although the mixing of different water masses may cause systematic error in the calculation, we found that the nonlinear effect induced by the mixing of different water masses was negligible in the upper layer of the North Pacific subtropical gyre along 175°E. The results of our improved method of assessing the distribution of anthropogenic CO2 in that region show marked differences from those obtained using the previous back-calculation method.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007820330520

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

6

Electronic Resource

A Preliminary Study of Oceanic Bomb Radiocarbon Inventory in the North Pacific during the Last Two Decades (1999)

Watanabe, Yutaka W. ; Ono, Tsuneo ; Harada, Koh ; [et al.]

Springer

Journal of oceanography 55 (1999), S. 705-716

add to mindlist on the mindlist

Details

ISSN: 1573-868X

Keywords: Oceanic bomb carbon ; North Pacific ; chemical transient tracers

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Radiocarbon and total carbonate data were obtained near the 1973 GEOSECS stations in the North Pacific along 30°N and along 175°E between 1993 and 1994. In these stations, we estimated radiocarbon originating from atomic bomb tests using tritium, trichlorofluoromethane and silicate contents. The average penetration depth of bomb radiocarbon during the two decades has deepened from 900 m to 1300 m. Bomb radiocarbon inventories above the average value for the whole North Pacific were found widely in the western subtropical region around 30°N both in the 1970s and 1990s, and its area in the 1990s was broader than that in the 1970s. In most of the North Pacific, while the bomb radiocarbon has decreased above 25.4σθ, the bomb radiocarbon flux below 25.4σθ was over 1 × 1012 atom m-2yr-1 in the subtropical region around 30°N. In the tropical area south of 20°N, the bomb radiocarbon inventory below 25.4σθ increased from zero to over 10 × 1012 atom m-2 during the last three decades. These distributions suggest that the bomb radiocarbon removed from the surface is currently accumulated with bomb 14C flux of over 1 × 1012 atom m-2yr-1 below 25.4σθ in the subtropical region, mainly by advection from the higher latitude, and that part of the accumulated bomb 14C gradually spread southward with about 30 years.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007868213682

Permalink