A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean

Chen，Ting1,2; Liu，Qingsong2,5; Roberts，Andrew P.3; Shi，Xuefa4,5; Zhang，Qiang6

2020-11-15

10.1016/j.quascirev.2020.106577

QUATERNARY SCIENCE REVIEWS   影响因子和分区

0277-3791

To test the biological effectiveness of iron fertilization by Asian aeolian dust and volcanic ash in the stratified high-nitrate, low-chlorophyll subarctic Pacific Ocean over long-time scales, we analysed sediments with ages between 2.8 and 0.9 Ma at ODP Site 885/886. This site lies far from the influence of other iron sources (e.g. icebergs or lateral iron transportation) and the water column has been stratified since intensification of northern hemisphere glaciation (iNHG) at ∼2.7 Ma, which limits nutrient upwelling and makes it an ideal location for testing iron bioavailability of different atmospheric sources that fell onto the surface ocean. We investigate diatom assemblages and opal export changes, and compare them with the properties of iron minerals in Asian aeolian dust and volcanic ash. Our results reveal that Asian aeolian dust contains mostly unreactive iron-bearing minerals that supplied limited bioavailable iron for diatom growth at Site 885/886. Diatom productivity changes were dominated by upwelling/stratification changes over long timescales, and by sporadic iron fertilization from volcanic ash inputs. Iron from volcanic ash particles is likely to have become bioavailable because such particles dissolved more readily due to their high porosity and ultra-fine size.

Diatoms HNLC Intensification of northern hemisphere glaciation Iron fertilization North Pacific Ocean Plio-Pleistocene transition

SCI ; EI

英语

第一 ; 通讯

National Key Research and Development Program of China[2016YFA0601903] ; National Natural Science Foundation of China (NNSFC)[41430962][41072136][41904069] ; Australian Research Council[DP110105419]

Physical Geography ; Geology

Geography, Physical ; Geosciences, Multidisciplinary

WOS:000582803000011

PERGAMON-ELSEVIER SCIENCE LTD

20203809201026

Biochemistry ; Glacial geology ; Oceanography ; Iron ; Nitrates ; Volcanoes ; Dust ; Sea ice

Air Pollution Sources:451.1 ; Oceanography, General:471.1 ; Geology:481.1 ; Seismology:484 ; Iron:545.1 ; Biochemistry:801.2 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2

GEOSCIENCES

2-s2.0-85090990518

Scopus

1.Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology (SUSTech),Shenzhen,518055,China
2.Centre for Marine Magnetism (CM),Department of Ocean Science and Engineering,Southern University of Science and Technology (SUSTech),Shenzhen,518055,China
3.Research School of Earth Sciences,Australian National University,Canberra,2601,Australia
4.Key Laboratory of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao,266061,China
5.Laboratory for Marine Geology,Pilot National Laboratory for Marine Science and Technology,Qingdao,266061,China
6.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China

Chen，Ting,Liu，Qingsong,Roberts，Andrew P.,et al. A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean[J]. QUATERNARY SCIENCE REVIEWS,2020,248.

Chen，Ting,Liu，Qingsong,Roberts，Andrew P.,Shi，Xuefa,&Zhang，Qiang.(2020).A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean.QUATERNARY SCIENCE REVIEWS,248.

Chen，Ting,et al."A test of the relative importance of iron fertilization from aeolian dust and volcanic ash in the stratified high-nitrate low-chlorophyll subarctic Pacific Ocean".QUATERNARY SCIENCE REVIEWS 248(2020).