The cross-shelf exchange of surface nutrients in the Bering Sea elucidated from <sup>228</sup>Ra tracer

XING Na; CHEN Min; HUANG Yi-pu; QIU Yu-sheng

Article Contents

Article Navigation > Haiyang Xuebao > 2011 > 33(2): 77-84

XING Na, CHEN Min, HUANG Yi-pu, QIU Yu-sheng. The cross-shelf exchange of surface nutrients in the Bering Sea elucidated from 228Ra tracer[J]. Haiyang Xuebao, 2011, 33(2): 77-84.

Citation:

XING Na, CHEN Min, HUANG Yi-pu, QIU Yu-sheng. The cross-shelf exchange of surface nutrients in the Bering Sea elucidated from ²²⁸Ra tracer[J]. Haiyang Xuebao, 2011, 33(2): 77-84.

XING Na, CHEN Min, HUANG Yi-pu, QIU Yu-sheng. The cross-shelf exchange of surface nutrients in the Bering Sea elucidated from 228Ra tracer[J]. Haiyang Xuebao, 2011, 33(2): 77-84.

Citation:

XING Na, CHEN Min, HUANG Yi-pu, QIU Yu-sheng. The cross-shelf exchange of surface nutrients in the Bering Sea elucidated from ²²⁸Ra tracer[J]. Haiyang Xuebao, 2011, 33(2): 77-84.

PDF( 1030 KB)

The cross-shelf exchange of surface nutrients in the Bering Sea elucidated from ²²⁸Ra tracer

1.
College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
2.
College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

Received Date: 2010-08-05

Abstract

Abstract

Surface water in the Bering Sea was collected in July-September 1999 for ²²⁸Ra measurements and used as a tracer for the cross-shelf exchange of nutrients. The specific activity of surface ²²⁸Ra ranges from below detection to 0.81 Bq/m³, which is lower than that reported in the western shelves of the Arctic Ocean. The spatial distribution of ²²⁸Ra and ²²⁸Ra/²²⁶Ra)_A.R. shows an increase from the central basin to the northeastern shelf. The relationship between ²²⁸Ra/²²⁶Ra)_A.R. and salinity indicates the influence of the Bering gyre, the Bering Slope Current and the Alaska Coastal Current on ²²⁸Ra and ²²⁸Ra/²²⁶Ra)_A.R.. Based on a one-dimensional steady state model of ²²⁸Ra, the horizontal eddy diffusion coefficient in study areas was calculated to be 1.9×10⁸ m²/d. The horizontal exchange fluxes of nutrients from the central basin to the northeastern shelf were estimated by combining the horizontal eddy diffusion coefficient and the spatial gradients of nutrients. The surface horizontal input of nitrate to the northeastern shelf only contributed a small fraction to the new production in the northeastern Bering Sea shelf waters, indicating the importance of other nutrient input pathways in supporting new production on the northeastern Bering shelf.
- Bering Sea,
- radium-228,
- water mixing,
- horizontal exchange fluxes of nutrients

FullText(HTML)

References(27)

References

GREBMEIER J M, COOPER L W, DENIRO M J. Oxygen isotopic composition of bottom seawater and tunicate cellulose used as indicators of water masses in the northern Bering and Chukchi Seas [J]. Limnology and Oceanography, 1990, 35(5): 1182—1195.

HARRISON P J, BOYD P W, VARELA D E, et al. Comparison of factors controlling phytoplankton productivity in the NE and NW subarctic Pacific gyres [J]. Progress in Oceanography, 1999, 43: 205—234.

KINDER T H, COACHMAN L K, GALT J A. The Bering slope current system [J]. Journal of Physical Oceanography, 1975, 5: 231—244.

KINDER T H, CHAPMAN D C, WHITEHEAD J A. Westward intensification of the mean circulation on the Bering Sea shelf [J]. Journal of Physical Oceanography, 1986, 16: 1217—1229.

KINNEY J C, MASLOWSKI W, OKKONEN S. On the processes controlling shelf-basin exchange and outer shelf dynamics in the Bering Sea [J]. Deep-Sea Research II, 2009, 56: 1351—1362.

BANSE K, ENGLISH D C. Comparing phytoplankton seasonality in the eastern and western subarctic Pacific and the western Bering Sea [J]. Progress in Oceanography, 1999, 43: 235—288.

陈敏,黄奕普,邱雨生. 白令海盆氮吸收速率的同位素示踪 [J].自然科学进展, 2007, 17(12): 1672—1684.

陈立奇,高众勇,王伟强,等. 白令海盆pCO₂分布特征及其对北极碳汇的影响[J].中国科学(D辑), 2003, 33(8): 781—790.

SAMBROTTO R N, GOERING J J, McROY C P. Yearly production of phytoplankton in the western Bering Strait[J]. Science, 1984, 225: 1147—1150.

SOROKIN Y I. Data on primary production in the Bering Sea and adjacent Northern Pacific[J]. Journal of Plankton Research, 1999, 21(4): 615—636.

XING N, CHEN M, HUANG Y P, et al. The distribution of ²²⁶Ra in the Arctic Ocean and the Bering Sea and its hydrologic implications[J]. Science in China:Series D, 2003, 46(5): 516—528.

谢永臻,黄奕普,施文远,等.天然水体中 ²²⁶Ra,²²⁸Ra的联合富集与测定 [J].厦门大学学报:自然科学版, 1994, 33(Sup): 86—90.

CHEN M, XING N, HHANG Y P, et al. The mean residence time of river water in the Canada Basin [J]. Chinese Science Bulletin, 2008, 53(5): 777—783.

金明明, 林以安, 卢勇, 等. 1999年7月白令海海盆营养盐和溶解氧的垂直特征[J]. 极地研究, 2001, 13(4): 264—272.

KAUFMAN A, TRIER R M, BROECKER W S, et al. Distribution of ²²⁸Ra in the world ocean[J]. Journal of Geophysical Research,1973, 78: 8827—8848.

MORDY C W, STABENO P J, RIGHT D, et al. Origins of the subsurface ammonium maximum in the southeast Bering Sea [J]. Deep-Sea Research:II, 2008, 55: 1738—1744.

WALSH J J, McROY C P, COACHMAN L K, et al. Carbon and nitrogen cycling within Bering/Chukchi Seas: source regions for organic matter affect AOU demands of the Arctic Ocean[J]. Progress in Oceanography, 1989, 22: 277—359.

MOORE W S. Radium-228: application to thermocline mixing studies[J]. Earth and Planetary Science Letters, 1972, 16: 421—422.

MOORE W S. Radum-228 in the South Atlantic Bight[J]. Journal of Geophysical Research, 1987, 92(C5): 5177—5190.

谢永臻.南海及厦门邻近海域镭同位素地球化学的研究 .厦门:厦门大学, 1994.

MOORE W S, FEELY H W, LI Y H. Radium isotopes in sub-arctic waters[J]. Earth and Planetary Science Letters, 1980, 49: 329—340.

COACHMAN L K. Circulation, water masses, and fluxes on the southeastern Bering Sea shelf [J]. Continental Shelf Research, 1986, 5: 23—108.

COACHMAN L K, WALSH J J. A diffusion model of cross-shelf exhange of nutrients in the southeastern Bering Sea[J]. Deep-Sea Research, 1981, 28: 819—846.

WALSH J J, McROY C P. Ecosystem analysis in the southeastern Bering Sea[J]. Continental Shelf Research, 1986, 5: 259—288.

WHITLEDGE T E, REEBURGH W S, WALSH J J. Seasonal inorganic nitrogen distribution and dynamics in the southeastern Bering Sea [J]. Continental Shelf Research, 1986, 5: 109—132.

STABENO P, NAPPY J, MORDY C, et al. Factors influencing physical structure and lower trophic levels of the eastern Bering Sea shelf in 2005: sea ice, tides and winds [J]. Progress in Oceanography, 2010, 85: 180—196.

CHEN L Q, GAO Z Y. Spatial variability in the partial pressures of CO₂ in the northern Bering and Chukchi Seas [J]. Deep-Sea Research:II, 2007, 54: 2619—2629.

Relative Articles

Supplements(0)

Cited By

Proportional views