Influence of the Arctic Sea-Ice Regime Shift on Sea-Ice Methylated Mercury Trends

被引:17
|
作者
Schartup, Amina T. [1 ]
Soerensen, Anne L. [2 ]
Heimburger-Boavida, Lars-Eric [3 ]
机构
[1] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
[2] Swedish Museum Nat Hist, Dept Environm Res & Monitoring, SE-10405 Stockholm, Sweden
[3] Aix Marseille Univ, CNRS, INSU, Mediterranean Inst Oceanog,UM 110, F-13288 Marseille, France
基金
欧洲研究理事会;
关键词
GAS-EXCHANGE; METHYLMERCURY; DIMETHYLMERCURY;
D O I
10.1021/acs.estlett.0c00465
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Arctic sea ice regulates the air-sea exchange of volatile mercury (Hg) species like dimethylmercury (DMHg) or elemental Hg and is known to host Hg methylating microbes that produce neurotoxic and biomagnifying monomethylmercury (MMHg). Arctic sea ice accounts for 57% of the total primary production in the Arctic Ocean, suggesting that it could be the main source of MMHg to arctic food webs. Despite this, little is known about Hg concentrations and speciation in arctic sea ice. Here, we report Hg species and show the importance of sea-ice composition on seaice methylmercury (MeHg = DMHg + MMHg) budgets. We propose that the shift from older sea ice (lower MeHg) to younger sea ice (higher MeHg) resulted in a 40% increase in MeHg (per square meter of sea ice) since 1979 despite a 45% decline in the total sea-ice volume. Approximately 30% of the MeHg sea-ice budget is DMHg, which means that when the sea ice melts in the summer it could contribute 0.03-2.7 pmol of DMHg m(-2) day(-1) to the atmosphere, which is comparable to diffusion from water (0.48-2.8 pmol of DMHg m(-2) day(-1)). This study shows that the MeHg content of rapidly shrinking arctic sea ice and exposure of sea-ice biota may not be declining as previously thought.
引用
收藏
页码:708 / 713
页数:6
相关论文
共 50 条
  • [1] Influence of internal variability on Arctic sea-ice trends
    Neil C. Swart
    John C. Fyfe
    Ed Hawkins
    Jennifer E. Kay
    Alexandra Jahn
    [J]. Nature Climate Change, 2015, 5 : 86 - 89
  • [2] Arctic sea-ice
    不详
    [J]. WEATHER, 2008, 63 (10) : 290 - 290
  • [3] Variations in the age of Arctic sea-ice and summer sea-ice extent
    Rigor, IG
    Wallace, JM
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2004, 31 (09) : L094011 - 4
  • [5] COMMENTARY: Influence of internal variability on Arctic sea-ice trends
    Swart, Neil C.
    Fyfe, John C.
    Hawkins, Ed
    Kay, Jennifer E.
    Jahn, Alexandra
    [J]. NATURE CLIMATE CHANGE, 2015, 5 (02) : 86 - 89
  • [6] Assimilating Summer Sea-Ice Thickness Observations Improves Arctic Sea-Ice Forecast
    Song, Ruizhe
    Mu, Longjiang
    Loza, Svetlana N.
    Kauker, Frank
    Chen, Xianyao
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2024, 51 (13)
  • [7] ON THE SEA-ICE REGIME OF THE ROSS SEA, ANTARCTICA
    STURMAN, AP
    ANDERSON, MR
    [J]. JOURNAL OF GLACIOLOGY, 1986, 32 (110) : 54 - 59
  • [8] Thinning of the Arctic sea-ice cover
    Rothrock, DA
    Yu, Y
    Maykut, GA
    [J]. GEOPHYSICAL RESEARCH LETTERS, 1999, 26 (23) : 3469 - 3472
  • [9] REVERBERATION UNDER ARCTIC SEA-ICE
    BROWN, JR
    MILNE, AR
    [J]. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1967, 42 (01): : 78 - &
  • [10] Influence of winter sea-ice motion on summer ice cover in the Arctic
    Kimura, Noriaki
    Nishimura, Akira
    Tanaka, Yohei
    Yamaguchi, Hajime
    [J]. POLAR RESEARCH, 2013, 32