FN Archimer Export Format
PT J
TI Analysis of global surface ocean alkalinity to determine controlling processes
BT 
AF FRY, Claudia H.
   TYRRELL, Toby
   HAIN, Mathis P.
   BATES, Nicholas R.
   ACHTERBERG, Eric P.
AS 1:1;2:1;3:1;4:1,2;5:1,3;
FF 1:;2:;3:;4:;5:;
C1 Univ Southampton, Natl Oceanog Ctr Southampton, Southampton, Hants, England.
   Bermuda Inst Ocean Sci, Ferry Reach, Bermuda.
   GEOMAR Helmholtz Ctr Ocean Res, D-24148 Kiel, Germany.
C2 UNIV SOUTHAMPTON, UK
   BERMUDA INST OCEAN SCI, BERMUDA
   GEOMAR, GERMANY
IF 3.412
TC 36
UR https://archimer.ifremer.fr/doc/00292/40367/83011.pdf
LA English
DT Article
CR OISO 8
   OISO1
   OISO2
   OISO3-NIVMER98
   OISO4 (VT 46)
   OISO5 (VT 49)
   VT 105 / OISO 17
   VT 108 / OISO-18
   VT 114 / OISO-19
   VT 117 / OISO-20
   VT 120 / OISO-21
   VT 127 / OISO-22
   VT 136 / OISO-23
   VT 51 / OISO 6
   VT 57 / OISO 9
   VT 60 / CARAUS - OISO 10
   VT 62 / CARAUS - OISO 11
   VT 79 / OISO 12
   VT 80 / OISO 13
   VT 81 / OISO 14
   VT 85 / OISO 15
   VT 94 / OISO 16
BO Marion Dufresne
DE ;Alkalinity;Calcium carbonate;Biogeochemical cycles;Tracers
AB The export of calcium carbonate (CaCO3) from the surface ocean is poorly constrained. A better understanding of the magnitude and spatial distribution of this flux would improve our knowledge of the ocean carbon cycle and marine biogeochemistry. Here, we investigate controls over the spatial distribution of total alkalinity in the surface global ocean and produce a tracer for CaCO3 cycling. We took surface ocean bottle data for total alkalinity from global databases (GLODAP, CARINA, PACIFICA) and subtracted the effects of several processes: evaporation and precipitation, river discharge, and nutrient uptake and remineralization. The remaining variation in alkalinity exhibits a robust and coherent pattern including features of large amplitude and spatial extent. Most notably, the residual variation in alkalinity is more or less constant across low latitudes of the global ocean but shows a strong poleward increase. There are differences of similar to 110 mu mol kg(-1) and similar to 85 mu mol kg(-1) between low latitudes and the Southern Ocean and the subarctic North Pacific, respectively, but, in contrast, little increase in the high-latitude North Atlantic. This global pattern is most likely due to production and export of CaCO3 and to physical resupply of alkalinity from deep waters. The use of river corrections highlights the large errors that are produced, particularly in the Bay of Bengal and the North Atlantic, if alkalinity normalization assumes all low salinities to be caused by rainfall. The residual alkalinity data can be used as a tracer to indicate where in the world's ocean most CaCO3 export from the surface layer takes place, and of future changes in calcification, for instance due to ocean acidification.
PY 2015
PD AUG
SO Marine Chemistry
SN 0304-4203
PU Elsevier Science Bv
VL 174
UT 000358628600005
BP 46
EP 57
DI 10.1016/j.marchem.2015.05.003
ID 40367
ER

EF