Multi-Elemental Tracers in the Amerasian Basin Reveal Interlinked Biogeochemical and Physical Processes in the Arctic Ocean Upper Halocline

被引：0

作者：

Whitmore, L. M. ^{[1
]}

Jensen, L. ^{[2
]}

Granger, J. ^{[3
]}

Xiang, Y. ^{[4
]}

Kipp, L. ^{[5
]}

Pasqualini, A. ^{[6
]}

Newton, R. ^{[7
]}

Agather, A. M. ^{[8
]}

Anderson, R. F. ^{[9
]}

Black, E. E. ^{[10
]}

Bowman, K. L. ^{[11
]}

Bourbonnais, A. ^{[12
]}

Brzezinski, M. A. ^{[13
]}

Bundy, R. M. ^{[2
]}

Charette, M. A. ^{[14
]}

Edwards, R. L. ^{[15
]}

Fitzsimmons, J. N. ^{[16
]}

Hansell, D. A. ^{[17
]}

Lam, P. J. ^{[11
]}

Morton, P. ^{[16
]}

Saito, M. A. ^{[14
]}

Schlosser, P. ^{[6
]}

Shiller, A. M. ^{[18
]}

Smethie, W. M. ^{[9
]}

Twining, B. S. ^{[19
]}

Woosley, R. J. ^{[20
]}

Zhang, R. ^{[21
]}

机构：

[1] Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK 99775 USA

[2] Univ Washington, Appl Phys Lab, Seattle, WA 98195 USA

[3] Univ Connecticut, Groton, CT USA

[4] Louisiana State Univ, Baton Rouge, LA USA

[5] Rowan Univ, Glassboro, NJ USA

[6] Arizona State Univ, Tempe, AZ USA

[7] Columbia Univ, New York, NY USA

[8] Sci & Technol Corp, Hampton, VA USA

[9] Columbia Univ, Lamont Doherty Earth Observ, New York, NY USA

[10] Univ Rochester, Rochester, NY USA

[11] Univ Calif Santa Cruz, Santa Cruz, CA USA

[12] Univ South Carolina, Sch Earth Ocean & Environm, Columbia, SC USA

[13] Univ Calif Santa Barbara, Santa Barbara, CA USA

[14] Woods Hole Oceanog Inst, Marine Chem & Geochem Dept, Woods Hole, MA USA

[15] Univ Minnesota, Dept Geol & Geophys, Minneapolis, MN USA

[16] Texas A&M Univ, Dept Oceanog, College Stn, TX USA

[17] Univ Miami, Miami, FL USA

[18] Daylight Geochem LLC, Slidell, LA USA

[19] Bigelow Lab Ocean Sci, East Boothbay, ME USA

[20] MIT, Cambridge, MA USA

[21] Shanghai Jiao Tong Univ, Shanghai, Peoples R China

来源：

GLOBAL BIOGEOCHEMICAL CYCLES | 2025年 / 39卷 / 04期

基金：

美国国家科学基金会;

关键词：

geochemical tracers; advection; biogeochemical cycles; water masses; DISSOLVED ORGANIC-CARBON; MEAN RESIDENCE TIMES; ATLANTIC WATER-FLOW; SEA-ICE LOSS; CHUKCHI SEA; CANADA BASIN; PACIFIC WATER; PERMAFROST DEGRADATION; EQUATORIAL PACIFIC; PB(II) SORPTION;

D O I：

10.1029/2024GB008342

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The physical and biogeochemical properties of the western Arctic Ocean are rapidly changing, resulting in cascading shifts to the local ecosystems. The nutrient-rich Pacific water inflow to the Arctic through the Bering Strait is modified on the Chukchi and East Siberian shelves by brine rejection during sea ice formation, resulting in a strong halocline (called the Upper Halocline Layer (UHL)) that separates the cold and relatively fresh surface layer from the warmer and more saline (and nutrient-poor) Atlantic-derived water below. Biogeochemical signals entrained into the UHL result from Pacific Waters modified by sediment and river influence on the shelf. In this synthesis, we bring together data from the 2015 Arctic U.S. GEOTRACES program to implement a multi-tracer (dissolved and particulate trace elements, radioactive and stable isotopes, macronutrients, and dissolved gas/atmospheric tracers) approach to assess the relative influence of shelf sediments, rivers, and Pacific seawater contribution to the Amerasian Arctic halocline. For each element, we characterized their behavior as mixing dominated (e.g., dCu, dGa), shelf-influenced (e.g., dFe, dZn), or a combination of both (e.g., dBa, dNi). Leveraging this framework, we assessed sources and sinks contributing to elemental distributions: shelf sediments (e.g., dFe, dZn, dCd, dHg), riverine sources, (e.g., dCu, dBa, dissolved organic carbon), and scavenging by particles originating on the shelf (e.g., dFe, dMn, dV, etc.). Additionally, synthesized results from isotopic and atmospheric tracers yielded tracer age estimates for the Upper Halocline ranging between 1 and 2 decades on a spatial gradient consistent with cyclonic circulation.

引用

页数：28